<PAGE>

                                                                    EXHIBIT 4.03
--------------------------------------------------------------------------------



                              AT HOME CORPORATION


                                      To


           STATE STREET BANK AND TRUST COMPANY OF CALIFORNIA, N.A.,

                                  as Trustee


                          ___________________________


                                   INDENTURE


                                  Dated as of
                               December 1, 1999

                          ___________________________


                  4% Convertible Subordinated Notes due 2006



--------------------------------------------------------------------------------
<PAGE>

<TABLE>
<CAPTION>

                                                      TABLE OF CONTENTS
                                                                                                                       Page
                                                                                                                       ----
<S>                 <C>                                                                                              <C>
ARTICLE ONE DEFINITIONS..............................................................................................     1

     Section 1.1.     Definitions....................................................................................     1

ARTICLE TWO ISSUE, DESCRIPTION, EXECUTION, REGISTRATION AND EXCHANGE OF
                      NOTES..........................................................................................     6

     Section 2.1.     Designation Amount and Issue of Notes..........................................................     6
     Section 2.2.     Form of Notes..................................................................................     6
     Section 2.3.     Date and Denomination of Notes; Payments of Interest...........................................     7
     Section 2.4.     Execution of Notes.............................................................................     8
     Section 2.5.     Exchange and Registration of Transfer of Notes; Restrictions on Transfer;
                      Depositary.....................................................................................     9
     Section 2.6.     Mutilated, Destroyed, Lost or Stolen Notes.....................................................    15
     Section 2.7.     Temporary Notes................................................................................    16
     Section 2.8.     Cancellation of Notes Paid, Etc................................................................    16
     Section 2.9.     CUSIP Numbers..................................................................................    17

ARTICLE THREE REDEMPTION OF NOTES....................................................................................    17

     Section 3.1.     (a) Initial Prohibition on Redemption..........................................................    17
     Section 3.2.     Notice of Redemptions; Selection of Notes......................................................    17
     Section 3.3.     Payment of Notes Called for Redemption.........................................................    19
     Section 3.4.     Conversion Arrangement on Call for Redemption..................................................    19
     Section 3.5.     Redemption at Option of Holders................................................................    21

ARTICLE FOUR SUBORDINATION OF NOTES..................................................................................    24

     Section 4.1.     Notes Subordinate to Senior Indebtedness.......................................................    24
     Section 4.2.     Payment Over of Proceeds upon Dissolution, Etc.................................................    24
     Section 4.3.     No Payment When Senior Indebtedness in Default.................................................    25
     Section 4.4.     Payment Permitted If No Default................................................................    26
     Section 4.5.     Subrogation to Rights of Holders of Senior Indebtedness........................................    26
     Section 4.6.     Provisions Solely To Define Relative Rights....................................................    27
     Section 4.7.     Trustee To Effectuate Subordination............................................................    27
     Section 4.8.     No Waiver of Subordination Provisions..........................................................    27
     Section 4.9.     Notice to Trustee..............................................................................    28
     Section 4.10.    Reliance on Judicial Order or Certificate of Liquidating Agent.................................    28
     Section 4.11.    Trustee Not Fiduciary for Holders of Senior Indebtedness.......................................    28
     Section 4.12.    Rights of Trustee as Holder of Senior Indebtedness; Preservation of Trustee's
                      Rights.........................................................................................    29
     Section 4.13.    Article Applicable to Paying Agents............................................................    29
     Section 4.14.    Certain Conversions Deemed Payment.............................................................    29

ARTICLE FIVE PARTICULAR COVENANTS OF THE COMPANY.....................................................................    29

     Section 5.1.     Payment of Principal, Premium and Interest.....................................................    29
     Section 5.2.     Maintenance of Office or Agency................................................................    30
</TABLE>

                                      -i-
<PAGE>

<TABLE>
<CAPTION>

                                                      TABLE OF CONTENTS
                                                          (continued)
                                                                                                                       Page
                                                                                                                       ----
<S>                  <C>                                                                                             <C>
     Section 5.3.     Appointments to Fill Vacancies in Trustee's Office.............................................    30
     Section 5.4.     Provisions as to Paying Agent..................................................................    30
     Section 5.5.     Existence......................................................................................    31
     Section 5.6.     Maintenance of Properties......................................................................    31
     Section 5.7.     Payment of Taxes and Other Claims..............................................................    32
     Section 5.8.     Rule 144A Information Requirement..............................................................    32
     Section 5.9.     Stay, Extension and Usury Laws.................................................................    32
     Section 5.10.    Compliance Certificate.........................................................................    33
     Section 5.11.    Liquidated Damages Notice......................................................................    33

ARTICLE SIX NOTEHOLDERS' LISTS AND REPORTS BY THE COMPANY AND THE
                      TRUSTEE........................................................................................    33

     Section 6.1.     Noteholders' Lists.............................................................................    33
     Section 6.2.     Preservation and Disclosure of Lists...........................................................    34
     Section 6.3.     Reports by Trustee.............................................................................    34
     Section 6.4.     Reports by Company.............................................................................    34

ARTICLE SEVEN REMEDIES OF THE TRUSTEE AND NOTEHOLDERS ON AN EVENT OF
                      DEFAULT........................................................................................    35

     Section 7.1.     Events of Default..............................................................................    35
     Section 7.2.     Payments of Notes on Default; Suit Therefor....................................................    36
     Section 7.3.     Application of Monies Collected by Trustee.....................................................    38
     Section 7.4.     Proceedings by Noteholder......................................................................    39
     Section 7.5.     Proceedings by Trustee.........................................................................    39
     Section 7.6.     Remedies Cumulative and Continuing.............................................................    39
     Section 7.7.     Direction of Proceedings and Waiver of Defaults by Majority of Noteholders.....................    40
     Section 7.8.     Notice of Defaults.............................................................................    40
     Section 7.9.     Undertaking to Pay Costs.......................................................................    40

ARTICLE EIGHT THE TRUSTEE............................................................................................    41

     Section 8.1.     Duties and Responsibilities of Trustee.........................................................    41
     Section 8.2.     Reliance on Documents, Opinions, Etc...........................................................    42
     Section 8.3.     No Responsibility for Recitals, Etc............................................................    43
     Section 8.4.     Trustee, Paying Agents, Conversion Agents or Registrar May Own Notes...........................    43
     Section 8.5.     Monies to be Held in Trust.....................................................................    43
     Section 8.6.     Compensation and Expenses of Trustee...........................................................    43
     Section 8.7.     Officers' Certificate as Evidence..............................................................    44
     Section 8.8.     Conflicting Interests of Trustee...............................................................    44
     Section 8.9.     Eligibility of Trustee.........................................................................    44
     Section 8.10.    Resignation or Removal of Trustee..............................................................    44
     Section 8.11.    Acceptance by Successor Trustee................................................................    45
     Section 8.12.    Succession by Merger, Etc......................................................................    46
     Section 8.13.    Preferential Collection of Claims..............................................................    46
     Section 8.14.    Trustee's Application for Instructions from the Company........................................    47
</TABLE>

                                      -ii-
<PAGE>

<TABLE>
<CAPTION>

                                                      TABLE OF CONTENTS
                                                          (continued)
                                                                                                                       Page
                                                                                                                       ----
<S>                 <C>                                                                                               <C>
ARTICLE NINE THE NOTEHOLDERS.........................................................................................    47

     Section 9.1.     Action by Noteholders..........................................................................    47
     Section 9.2.     Proof of Execution by Noteholders..............................................................    47
     Section 9.3.     Who Are Deemed Absolute Owners.................................................................    47
     Section 9.4.     Company-Owned Notes Disregarded................................................................    48
     Section 9.5.     Revocation of Consents; Future Holders Bound...................................................    48

ARTICLE TEN MEETINGS OF NOTEHOLDERS..................................................................................    48

     Section 10.1.    Purpose of Meetings............................................................................    48
     Section 10.2.    Call of Meetings by Trustee....................................................................    49
     Section 10.3.    Call of Meetings by Company or Noteholders.....................................................    49
     Section 10.4.    Qualifications for Voting......................................................................    49
     Section 10.5.    Regulations....................................................................................    50
     Section 10.6.    Voting.........................................................................................    50
     Section 10.7.    No Delay of Rights by Meeting..................................................................    50

ARTICLE ELEVEN SUPPLEMENTAL INDENTURES...............................................................................    51

     Section 11.1.    Supplemental Indentures Without Consent of Noteholders.........................................    51
     Section 11.2.    Supplemental Indenture with Consent of Noteholders.............................................    52
     Section 11.3.    Effect of Supplemental Indenture...............................................................    53
     Section 11.4.    Notation on Notes..............................................................................    53
     Section 11.5.    Evidence of Compliance of Supplemental Indenture to be Furnished to
                      Trustee........................................................................................    53

ARTICLE TWELVE CONSOLIDATION, MERGER, SALE, CONVEYANCE AND LEASE.....................................................    53

     Section 12.1.    Company May Consolidate, Etc on Certain Terms..................................................    53
     Section 12.2.    Successor Corporation to be Substituted........................................................    54
     Section 12.3.    Opinion of Counsel to be Given Trustee.........................................................    54

ARTICLE THIRTEEN SATISFACTION AND DISCHARGE OF INDENTURE.............................................................    54

     Section 13.1.    Discharge of Indenture.........................................................................    55
     Section 13.2.    Deposited Monies to be Held in Trust by Trustee................................................    55
     Section 13.3.    Paying Agent to Repay Monies Held..............................................................    55
     Section 13.4.    Return of Unclaimed Monies.....................................................................    55
     Section 13.5.    Reinstatement..................................................................................    56

ARTICLE FOURTEEN IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS
                      AND DIRECTORS..................................................................................    57

     Section 14.1.    Indenture and Notes Solely Corporate Obligations...............................................    57

ARTICLE FIFTEEN CONVERSION OF NOTES..................................................................................    57

     Section 15.1.    Right to Convert...............................................................................    57
     Section 15.2.    Exercise of Conversion Privilege; Issuance of Common Stock on
                      Conversion; No Adjustment for Interest or Dividends............................................    57
</TABLE>

                                     -iii-
<PAGE>

<TABLE>
<CAPTION>

                                                      TABLE OF CONTENTS
                                                          (continued)
                                                                                                                       Page
                                                                                                                       ----
<S>                  <C>                                                                                             <C>
     Section 15.3.    Cash Payments in Lieu of Fractional Shares.....................................................    59
     Section 15.4.    Conversion Price...............................................................................    59
     Section 15.5.    Adjustment of Conversion Price.................................................................    59
     Section 15.6.    Effect of Reclassification, Consolidation, Merger or Sale......................................    67
     Section 15.7.    Special Provisions Applicable to Tracking Stock or Similar Arrangement.........................    67
     Section 15.8.    Taxes on Shares Issued.........................................................................    70
     Section 15.9.    Reservation of Shares; Shares to be Fully Paid; Compliance with
                      Governmental Requirements; Listing of Common Stock.............................................    70
     Section 15.10.   Responsibility of Trustee......................................................................    71
     Section 15.11.   Notice to Holders Prior to Certain Actions.....................................................    71

ARTICLE SIXTEEN MISCELLANEOUS PROVISIONS.............................................................................    72

     Section 16.1.    Provisions Binding on Company's Successors.....................................................    72
     Section 16.2.    Official Acts by Successor Corporation.........................................................    72
     Section 16.3.    Addresses for Notices, Etc.....................................................................    72
     Section 16.4.    Governing Law..................................................................................    73
     Section 16.5.    Evidence of Compliance with Conditions Precedent; Certificates to Trustee......................    73
     Section 16.6.    Legal Holidays.................................................................................    73
     Section 16.7.    Trust Indenture Act............................................................................    73
     Section 16.8.    No Security Interest Created...................................................................    74
     Section 16.9.    Benefits of Indenture..........................................................................    74
     Section 16.10.   Table of Contents, Headings, Etc...............................................................    74
     Section 16.11.   Authenticating Agent...........................................................................    74
     Section 16.12.   Execution in Counterparts......................................................................    75
     Section 16.13.   Severability...................................................................................    75
</TABLE>

                                      -iv-
<PAGE>

Reconciliation and Tie Between the Trust Indenture Act of 1939, as amended, and
Indenture, dated as of December 1, 1999, between At Home Corporation and State
Street Bank and Trust Company of California, N.A., as Trustee.

<TABLE>
<CAPTION>
TRUST INDENTURE ACT SECTION         INDENTURE SECTION
<S>                              <C>
Section 310(a)(1)....................................................... 8.9
       (a)(2)........................................................... 8.9
       (a)(3).......................................................... N.A.
       (a)(4).......................................................... N.A.
       (a)(5)........................................................... 8.9
       (b)............................................. 8.8; 8.9; 8.10; 8.11
Section 311(a)......................................................... 8.13
       (b)............................................................. 8.13
       (b)(2).......................................................... 8.13
Section 312(a)..................................................... 6.1; 6.2(a)
       (b).............................................................. 6.2(b)
       (c).............................................................. 6.2(c)
Section 313(a).......................................................... 6.3(a)
       (b).............................................................. 6.3(a)
       (c).............................................................. 6.3(a)
       (d).............................................................. 6.3(b)
Section 314(a).......................................................... 6.4
       (b)............................................................. N.A.
       (c)(1).......................................................... 16.5
       (c)(2).......................................................... 16.5
       (c)(3).......................................................... N.A.
       (d)............................................................. N.A.
       (e)............................................................. 16.5
Section 315(a).......................................................... 8.1
       (b).............................................................. 7.8
       (c).............................................................. 8.1
       (d).............................................................. 8.1
       (d)(1)........................................................... 8.1(a)
       (d)(2)........................................................... 8.1(b)
       (d)(3)........................................................... 8.1(c)
       (e).............................................................. 7.9
Section 316(a).......................................................... 7.7
       (a)(1)(A)........................................................ 7.7
       (a)(1)(B)........................................................ 7.7
       (a)(2).......................................................... N.A.
       (b).............................................................. 7.4
Section 317(a)(1)....................................................... 7.5
       (a)(2)........................................................... 7.5
       (b).............................................................. 5.4
Section 318(a)......................................................... 16.7
</TABLE>
------------------
*   Note:  This reconciliation and tie shall not, for any purpose, be deemed to
           be a part of the Indenture.
**  Note:  N.A. means Not Applicable.
<PAGE>

                                   INDENTURE

     INDENTURE, dated as of December 1, 1999, between At Home Corporation, a
Delaware corporation (hereinafter called the "Company"), having its principal
office at 450 Broadway, Redwood City, California 94063, and State Street Bank
and Trust Company of California, N.A., a national banking association organized
under the laws of the United States, as trustee hereunder (hereinafter called
the "Trustee"), having its principal corporate office at 633 West 5th Street,
12th Floor, Los Angeles, California 90071.

                             W I T N E S S E T H:
                             -------------------

     WHEREAS, for its lawful corporate purposes, the Company has duly authorized
the issue of its 4% Convertible Subordinated Notes due 2006 (hereinafter called
the "Notes") and, to provide the terms and conditions upon which the Notes are
to be authenticated, issued and delivered, the Company has duly authorized the
execution and delivery of this Indenture; and

     WHEREAS, the Notes, the certificate of authentication to be borne by the
Notes, a form of assignment, a form of option to elect repayment upon a
Fundamental Change, and a form of conversion notice to be borne by the Notes are
to be substantially in the forms hereinafter provided for; and

     WHEREAS, all acts and things necessary to make the Notes, when executed by
the Company and authenticated and delivered by the Trustee or a duly authorized
authenticating agent, as in this Indenture provided, the valid, binding and
legal obligations of the Company, and to constitute this Indenture a valid
agreement according to its terms, have been done and performed, and the
execution of this Indenture and the issue hereunder of the Notes have in all
respects been duly authorized.

     NOW, THEREFORE, THIS INDENTURE WITNESSETH:

     That in order to declare the terms and conditions upon which the Notes are,
and are to be, authenticated, issued and delivered, and in consideration of the
premises and of the purchase and acceptance of the Notes by the holders thereof,
the Company covenants and agrees with the Trustee for the equal and
proportionate benefit of the respective holders from time to time of the Notes
(except as otherwise provided below), as follows:

                                  ARTICLE ONE

                                  DEFINITIONS

     Section 1.1.  Definitions.  The terms defined in this Section 1.1 (except
                   -----------
as herein otherwise expressly provided or unless the context otherwise requires)
for all purposes of this Indenture and of any indenture supplemental hereto
shall have the respective meanings specified in this Section 1.1. All other
terms used in this Indenture that are defined in the Trust Indenture Act or
which are by reference therein defined in the Securities Act (except as herein
otherwise expressly provided or unless the context otherwise requires) shall
have the meanings assigned to such terms in said Trust Indenture Act and in said
Securities Act as in force at the date of the execution of this Indenture. The
words "herein", "hereof", "hereunder", and words of similar import refer to this
Indenture as a whole and not to any particular Article, Section or other
Subdivision. The terms defined in this Article include the plural as well as the
singular.
<PAGE>

     "Affiliate" of any specified Person means any other Person directly or
      ---------
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person.  For the purposes of this definition,
"control", when used with respect to any specified Person means the power to
direct or cause the direction of the management and policies of such Person,
directly or indirectly, whether through the ownership of voting securities, by
contract or otherwise, and the terms "controlling" and "controlled" have
meanings correlative to the foregoing.

     "Board of Directors" means the Board of Directors of the Company or a
      ------------------
committee of such Board duly authorized to act for it hereunder.

     "Business Day" means each Monday, Tuesday, Wednesday, Thursday and Friday
      ------------
which is not a day on which the banking institutions in The City of New York or
the city in which the Corporate Trust Office is located are authorized or
obligated by law or executive order to close or be closed.

     "Closing Price" has the meaning specified in Section 15.5(h)(1).
      -------------

     "Commission" means the Securities and Exchange Commission, as from time to
      ----------
time constituted, created under the Exchange Act, or, if at any time after the
execution of this Indenture such Commission is not existing and performing the
duties now assigned to it under the Trust Indenture Act, then the body
performing such duties at such time.

     "Common Equity" means the Common Stock, the Series B Common Stock, par
      -------------
value $0.01 per share, of the Company, and the Series K Common Stock, par value
$0.01 per share, of the Company authorized at the date of this instrument as
originally executed or shares of any class or classes resulting from any
reclassification or reclassifications thereof.

     "Common Stock" means the Series A Common Stock, par value $0.01 per share,
      ------------
of the Company authorized at the date of this instrument as originally executed.
Subject to the provisions of Sections 15.6 and 15.7, shares issuable on
conversion or repurchase of Notes shall include only shares of Common Stock or
shares of any class or classes of common stock resulting from any
reclassification or reclassifications thereof or distributed on Common Stock
pursuant to a distribution subject to Section 15.7; provided, however, that if
                                                    --------  -------
at any time there shall be more than one such resulting class, the shares so
issuable on conversion of Notes shall include shares of all such classes, and
the shares of each such class then so issuable shall be substantially in the
proportion which the total number of shares of such class resulting from all
such reclassifications bears to the total number of shares of all such classes
resulting from all such reclassifications.

     "common stock" means any stock of any class of capital stock which has no
      ------------
preference in respect of dividends or of amounts payable in the event of any
voluntary or involuntary liquidation, dissolution or winding up of the issuer
thereof (other than preferences among classes of capital stock designed to
represent economic interest in distinct businesses of the same issuer as in the
case of a "tracking stock") and which is not subject to redemption by the issuer
thereof (except in the case of a "tracking stock" in exchange for common stock
of a Person owning substantially all of the assets of the business the
performance of which is tracked by such capital stock).

     "Company" means the corporation named as the "Company" in the first
      -------
paragraph of this Indenture, and, subject to the provisions of Article Twelve,
shall include its successors and assigns.

     "Company Notice" has the meaning specified in Section 3.5(b).
      --------------

                                      -2-
<PAGE>

     "Conversion Price" has the meaning specified in Section 15.4.
      ----------------

     "Corporate Trust Office" or other similar term, means the designated office
      ----------------------
of the Trustee at which at any particular time its corporate trust business
shall be administered, which office is, at the date as of which this Indenture
is dated, located at 633 West 5th Street, 12th Floor, Los Angeles, California
90071, Attention: Corporate Trust Department (At Home Corporation, 4%
Convertible Subordinated Notes due 2006).

     "Custodian" means State Street Bank and Trust Company of California, N.A.,
      ---------
as custodian with respect to the Notes in global form, or any successor entity
thereto.

     "default" means any event that is, or after notice or passage of time, or
      -------
both, would be, an Event of Default.

     "Defaulted Interest" has the meaning specified in Section 2.3.
      ------------------

     "Depositary" means, with respect to the Notes issuable or issued in whole
      ----------
or in part in global form, the Person specified in Section 2.5(d) as the
Depositary with respect to such Notes, until a successor shall have been
appointed and become such pursuant to the applicable provisions of this
Indenture, and thereafter, "Depositary" shall mean or include such successor.

     "Event of Default" means any event specified in Section 7.1(a), (b), (c),
      ----------------
(d), (e) or (f).

     "Exchange Act" means the Securities Exchange Act of 1934, as amended, and
      ------------
the rules and regulations promulgated thereunder, as in effect from time to
time.

     "Fundamental Change" shall have the meaning specified in Section 3.5(g).
      ------------------

     "Global Note" has the meaning set forth in Section 2.5(b).
      -----------

     "Indenture" means this instrument as originally executed or, if amended or
      ---------
supplemented as herein provided, as so amended or supplemented.

     "Initial Purchasers" means Morgan Stanley & Co. Incorporated, Goldman,
      ------------------
Sachs & Co., Deutsche Bank Securities Inc., Donaldson, Lufkin & Jenrette
Securities Corporation, Hambrecht & Quist LLC and BancBoston Robertson Stephens
Inc.

     "Institutional Accredited Investor" means an institutional "accredited
      ---------------------------------
investor" within the meaning of Rule 501(a)(1), (2), (3) or (7) under the
Securities Act.

     "Liquidated Damages" has the meaning specified for "Liquidated Damages
      ------------------
Amount" in Section 2(e) of the Registration Rights Agreement.

     "Note" or "Notes" means any Note or Notes, as the case may be,
      ----      -----
authenticated and delivered under this Indenture, including the Global Note.

     "Note register" has the meaning specified in Section 2.5(a).
      -------------

     "Note registrar" has the meaning specified in Section 2.5(a).
      --------------

                                      -3-
<PAGE>

     "Noteholder" or "holder" as applied to any Note, or other similar terms
      ----------      ------
(but excluding the term "beneficial holder"), means any Person in whose name at
the time a particular Note is registered on the Note registrar's books.

     "Officers' Certificate", when used with respect to the Company, means a
      ---------------------
certificate signed by both (a) the Chairman of the Board, the Chief Executive
Officer, the President or any Vice President and (b) the Treasurer or any
Assistant Treasurer, the Controller or any Assistant Controller, or the
Secretary or any Assistant Secretary of the Company.

     "Opinion of Counsel" means an opinion in writing signed by legal counsel,
      ------------------
who may be an employee of or counsel to the Company, or other counsel reasonably
acceptable to the Trustee.

     "outstanding", when used with reference to Notes and subject to the
      -----------
provisions of Section 9.4, means, as of any particular time, all Notes
authenticated and delivered by the Trustee under this Indenture, except:

          (a)  Notes theretofore canceled by the Trustee or delivered to the
     Trustee for cancellation;

          (b)  Notes, or portions thereof, (i) for the redemption of which
     monies in the necessary amount shall have been deposited in trust with the
     Trustee or with any paying agent (other than the Company) or (ii) which
     shall have been otherwise defeased in accordance with Article Thirteen;

          (c)  Notes in lieu of which, or in substitution for which, other Notes
     shall have been authenticated and delivered pursuant to the terms of
     Section 2.6; and

          (d)  Notes converted into Common Stock pursuant to Article Fifteen and
     Notes deemed not outstanding pursuant to Article Three.

     "Person" means a corporation, an association, a partnership, a limited
      ------
liability company, an individual, a joint venture, a joint stock company, a
trust, an unincorporated organization or a government or an agency or a
political subdivision thereof.

     "Portal Market" means The Portal Market operated by the National
      -------------
Association of Securities Dealers, Inc. or any successor thereto.

     "Predecessor Note" of any particular Note means every previous Note
      ----------------
evidencing all or a portion of the same debt as that evidenced by such
particular Note, and, for the purposes of this definition, any Note
authenticated and delivered under Section 2.6 in lieu of a lost, destroyed or
stolen Note shall be deemed to evidence the same debt as the lost, destroyed or
stolen Note that it replaces.

     "QIB" means a "qualified institutional buyer" as defined in Rule 144A.
      ---

     "Registration Rights Agreement" means that certain Registration Rights
      -----------------------------
Agreement, dated as of December 1, 1999, among the Company and the Initial
Purchasers, as amended from time to time in accordance with its terms.

     "Responsible Officer", when used with respect to the Trustee, means an
      -------------------
officer of the Trustee in the Corporate Trust Office assigned and duly
authorized by the Trustee to administer this Indenture.

     "Restricted Securities" has the meaning specified in Section 2.5(d).
      ---------------------

                                      -4-
<PAGE>

     "Rule 144A" means Rule 144A as promulgated under the Securities Act.
      ---------

     "Securities Act" means the Securities Act of 1933, as amended, and the
      --------------
rules and regulations promulgated thereunder, as in effect from time to time.

     "Senior Indebtedness" means, without duplication, the principal, premium
      -------------------
(if any) and unpaid interest (including all interest accruing subsequent to the
commencement of any bankruptcy or similar proceeding, whether or not a claim for
post-petition interest is allowable as a claim in any such proceeding), rent and
end of term payments payable on or in connection with, and, to the extent not
included in the foregoing, all amounts payable as fees, costs, expenses,
liquidated damages, indemnities, repurchase and other put obligations and other
amounts to the extent accrued or due on or in connection with, all present and
future secured (i) indebtedness of the Company for borrowed money, (ii)
obligations of the Company evidenced by bonds, debentures, notes or similar
instruments, (iii) all obligations of the Company under (w) securities
repurchase agreements, (x) interest rate swaps, caps, collars, options and
similar arrangements, (y) any foreign exchange contract, currency swap contract,
futures contract, currency option contract or other foreign currency hedge, and
(z) credit swaps, caps, floors, collars and similar arrangements, (iv)
obligations incurred, assumed or guaranteed by the Company in connection with
the acquisition by it or a subsidiary of any business, properties or assets
(except purchase-money indebtedness classified as accounts payable under
generally accepted accounting principles), (v) obligations of the Company as
lessee under leases required to be capitalized on the balance sheet of the
lessee under generally accepted accounting principles and liabilities under any
financing lease or so-called "synthetic" lease transaction entered into by the
Company, (vi) reimbursement obligations of the Company in respect of letters of
credit, bank guarantees or bankers' acceptances, (vii) obligations of the
Company to make payments to any entity as consideration for the acquisition by
the Company of subscribers to its current Internet services or to future similar
or related services, or to acquire rights to transport data using assets owned
by any other entity, and (viii) obligations of the Company under direct or
indirect guarantees in respect of, and obligations (contingent or otherwise) to
purchase or otherwise acquire, or otherwise to assure a creditor against loss in
respect of, indebtedness or obligations of others of the kinds referred to in
clauses (i) through (vii) above, provided that Senior Indebtedness shall not
                                 --------
include: (a) any indebtedness or obligations of the kinds referred to in clause
(i) through (viii) above (collectively, "Debt") as to which, in the instrument
or agreement creating or evidencing the same or pursuant to which the same is
outstanding, it is expressly provided that such Debt shall be subordinated in
right of payment to any other Debt of the Company, unless such instrument or
agreement expressly provides that such Debt shall be senior in right of payment
to the Notes; (b) any Debt that is not secured; (c) any Debt of the Company as
to which, in the instrument or agreement creating or evidencing the same or
pursuant to which the same is outstanding, it is expressly provided that such
Debt shall not be senior in right of payment to, or is pari passu in right of
payment with, or ranks junior in right of payment to, the Notes; (d) Debt of the
Company in respect of the Notes; (e) any Debt of the Company to any Subsidiary
of the Company; and (f) the Company's Convertible Subordinated Debentures due
2018.

     "Significant Subsidiary" means, as of any date of determination, a
      ----------------------
Subsidiary of the Company, if as of such date of determination either (a) the
assets of such subsidiary equal 10% or more of the Company's total consolidated
assets or (b) the total revenue of which represented 10% or more of the
Company's consolidated total revenue for the most recently completed fiscal
year.

     "Subsidiary" means, with respect to any Person, (i) any corporation,
      ----------
association or other business entity of which more than 50% of the total voting
power of shares of capital stock or other equity interest entitled (without
regard to the occurrence of any contingency) to vote in the election of
directors, managers or trustees thereof is at the time owned or controlled,
directly or indirectly, by such Person or one or more of the

                                      -5-
<PAGE>

other subsidiaries of that Person (or a combination thereof) and (ii) any
partnership (a) the sole general partner or managing general partner of which is
such Person or a subsidiary of such Person or (b) the only general partners of
which are such Person or of one or more subsidiaries of such Person (or any
combination thereof).

     "Trading Day" has the meaning specified in Section 15.5(h)(5).
      -----------

     "Trigger Event" has the meaning specified in Section 15.5(d).
      -------------

     "Trust Indenture Act" means the Trust Indenture Act of 1939, as amended, as
      -------------------
it was in force at the date of this Indenture, except as provided in Sections
11.3 and 15.6; provided, however, that, in the event the Trust Indenture Act of
1939 is amended after the date hereof, the term "Trust Indenture Act" shall
mean, to the extent required by such amendment, the Trust Indenture Act of 1939
as so amended.

     "Trustee" means State Street Bank and Trust Company of California, N.A. and
      -------
its successors and any corporation resulting from or surviving any consolidation
or merger to which it or its successors may be a party and any successor trustee
at the time serving as successor trustee hereunder.

     "Vice President," when used with respect to the Company or the Trustee,
      --------------
means any vice president whether or not designated by a number or a word or
words before or after the title "vice president."

     The definitions of certain other terms are as specified in Sections 2.5 and
3.5 and Article Fifteen.

                                  ARTICLE TWO

                        ISSUE, DESCRIPTION, EXECUTION,
                      REGISTRATION AND EXCHANGE OF NOTES

     Section 2.1.  Designation Amount and Issue of Notes.  The Notes shall be
                   -------------------------------------
designated as "4% Convertible Subordinated Notes due 2006". Notes not to exceed
the aggregate principal amount of $500,000,000 (or up to $575,000,000 if the
over-allotment option (the "Over-allotment Option") set forth in Section 2 of
Purchase Agreement dated December 7, 1999 (as amended from time to time by the
parties thereto) by and between the Company and the Initial Purchasers is
exercised in full) (except pursuant to Sections 2.5, 2.6, 3.3, 3.5 and 15.2
hereof) upon the execution of this Indenture, or from time to time thereafter,
may be executed by the Company and delivered to the Trustee for authentication,
and the Trustee shall thereupon authenticate and deliver said Notes to or upon
the written order of the Company, signed by (a) its Chairman of the Board, Chief
Executive Officer, President or any Vice President and (b) its Treasurer or any
Assistant Treasurer, its Controller or any Assistant Controller or its Secretary
or any Assistant Secretary, without any further action by the Company hereunder.

     Section 2.2.  Form of Notes.  The Notes and the Trustee's certificate of
                   -------------
authentication to be borne by such Notes shall be substantially in the form set
forth in Exhibit A, which is incorporated in and made a part of this Indenture.
         ---------

     Any of the Notes may have such letters, numbers or other marks of
identification and such notations, legends and endorsements as the officers
executing the same may approve (execution thereof to be conclusive evidence of
such approval) and as are not inconsistent with the provisions of this
Indenture, or as may be required to comply with any law or with any rule or
regulation made pursuant thereto or with any rule or

                                      -6-
<PAGE>

regulation of any securities exchange or automated quotation system on which the
Notes may be listed, or to conform to usage.

     Any Global Note shall represent such of the outstanding Notes as shall be
specified therein and shall provide that it shall represent the aggregate amount
of outstanding Notes from time to time endorsed thereon and that the aggregate
amount of outstanding Notes represented thereby may from time to time be
increased or reduced to reflect transfers or exchanges permitted hereby.  Any
endorsement of a Global Note to reflect the amount of any increase or decrease
in the amount of outstanding Notes represented thereby shall be made by the
Trustee or the Custodian, at the direction of the Trustee, in such manner and
upon instructions given by the holder of such Notes in accordance with this
Indenture.  Payment of principal of and interest and premium, if any, on any
Global Note shall be made to the holder of such Note.

     The terms and provisions contained in the form of Note attached as Exhibit
                                                                        -------
A hereto shall constitute, and are hereby expressly made, a part of this
-
Indenture and, to the extent applicable, the Company and the Trustee, by their
execution and delivery of this Indenture, expressly agree to such terms and
provisions and to be bound thereby.

     Section 2.3.  Date and Denomination of Notes; Payments of Interest.  The
                   ----------------------------------------------------
Notes shall be issuable in registered form without coupons in denominations of
$1,000 principal amount and integral multiples thereof. Every Note shall be
dated the date of its authentication and shall bear interest from the applicable
date in each case as specified on the face of the form of Note attached as
Exhibit A hereto. Interest on the Notes shall be computed on the basis of a
----------
360-day year comprised of twelve (12) 30-day months.

     The Person in whose name any Note (or its Predecessor Note) is registered
on the Note register at the close of business on any record date with respect to
any interest payment date shall be entitled to receive the interest payable on
such interest payment date, except (i) that the interest payable upon redemption
(unless the date of redemption is an interest payment date) will be payable to
the Person to whom principal is payable and (ii) as set forth in the next
succeeding sentence.  In the case of any Note (or portion thereof) that is
converted into Common Stock during the period from (but excluding) a record date
to (but excluding) the next succeeding interest payment date either (x) if such
Note (or portion thereof) has been called for redemption on a redemption date
which occurs during such period, or is to be redeemed in connection with a
Fundamental Change on a Repurchase Date (as defined in Section 3.5) that occurs
during such period, the Company shall not be required to pay interest on such
interest payment date in respect of any such Note (or portion thereof) except to
the extent required to be paid upon redemption of such Note or portion thereof
pursuant to Section 3.3 or 3.5 hereof or (y) if such Note (or portion thereof)
has not been called for redemption on a redemption date that occurs during such
period and is not to be redeemed in connection with a Fundamental Change on a
Repurchase Date that occurs during such period, such Note (or portion thereof)
that is submitted for conversion during such period shall be accompanied by
funds equal to the interest payable on such succeeding interest payment date on
the principal amount so converted, as provided in the penultimate paragraph of
Section 15.2 hereof.  Interest shall be payable at the office of the Company
maintained by the Company for such purposes in the Borough of Manhattan, City of
New York, which shall initially be an office or agency of the Trustee and may,
as the Company shall specify to the paying agent in writing by each record date,
be paid either (i) by check mailed to the address of the Person entitled thereto
as it appears in the Note register (provided that the holder of Notes with an
aggregate principal amount in excess of $2,000,000 shall, at the written
election of such holder, be paid by wire transfer in immediately available
funds) or (ii) by transfer to an account maintained by such Person located in
the United States; provided, however, that payments to the Depositary will be
made by wire transfer of immediately available funds to the account of the

                                      -7-
<PAGE>

Depositary or its nominee.  The term "record date" with respect to any interest
payment date shall mean the June 1 or December 1 preceding the relevant June 15
or December 15, respectively.

     Any interest on any Note which is payable, but is not punctually paid or
duly provided for, on any June 15 or December 15 (herein called "Defaulted
Interest") shall forthwith cease to be payable to the Noteholder on the relevant
record date by virtue of his having been such Noteholder, and such Defaulted
Interest shall be paid by the Company, at its election in each case, as provided
in clause (1) or (2) below:

          (1)  The Company may elect to make payment of any Defaulted Interest
     to the Persons in whose names the Notes (or their respective Predecessor
     Notes) are registered at the close of business on a special record date for
     the payment of such Defaulted Interest, which shall be fixed in the
     following manner. The Company shall notify the Trustee in writing of the
     amount of Defaulted Interest to be paid on each Note and the date of the
     payment (which shall be not less than twenty-five (25) days after the
     receipt by the Trustee of such notice, unless the Trustee shall consent to
     an earlier date), and at the same time the Company shall deposit with the
     Trustee an amount of money equal to the aggregate amount to be paid in
     respect of such Defaulted Interest or shall make arrangements satisfactory
     to the Trustee for such deposit prior to the date of the proposed payment,
     such money when deposited to be held in trust for the benefit of the Person
     entitled to such Defaulted Interest as in this clause provided. Thereupon
     the Trustee shall fix a special record date for the payment of such
     Defaulted Interest which shall be not more than fifteen (15) days and not
     less than ten (10) days prior to the date of the proposed payment, and not
     less than ten (10) days after the receipt by the Trustee of the notice of
     the proposed payment, the Trustee shall promptly notify the Company of such
     special record date and, in the name and at the expense of the Company,
     shall cause notice of the proposed payment of such Defaulted Interest and
     the special record date therefor to be mailed, first-class postage prepaid,
     to each Noteholder at his address as it appears in the Note register, not
     less than ten (10) days prior to such special record date. Notice of the
     proposed payment of such Defaulted Interest and the special record date
     therefor having been so mailed, such Defaulted Interest shall be paid to
     the Persons in whose names the Notes (or their respective Predecessor
     Notes) were registered at the close of business on such special record date
     and shall no longer be payable pursuant to the following clause (2) of this
     Section 2.3.

          (2)  The Company may make payment of any Defaulted Interest in any
     other lawful manner not inconsistent with the requirements of any
     securities exchange or automated quotation system on which the Notes may be
     listed or designated for issuance, and upon such notice as may be required
     by such exchange or automated quotation system, if, after notice given by
     the Company to the Trustee of the proposed payment pursuant to this clause,
     such manner of payment shall be deemed practicable by the Trustee.

     Section 2.4.  Execution of Notes.  The Notes shall be signed in the name
                   ------------------
and on behalf of the Company by the manual or facsimile signature of its
Chairman of the Board, Chief Executive Officer, President or any Vice President
and attested by the manual or facsimile signature of its Secretary or any of its
Assistant Secretaries or its Treasurer or any of its Assistant Treasurers (which
may be printed, engraved or otherwise reproduced thereon, by facsimile or
otherwise). Only such Notes as shall bear thereon a certificate of
authentication substantially in the form set forth on the form of Note attached
as Exhibit A hereto, manually executed by the Trustee (or an authenticating
   ---------
agent appointed by the Trustee as provided by Section 16.11), shall be entitled
to the benefits of this Indenture or be valid or obligatory for any purpose.
Such certificate by the Trustee (or such an authenticating agent) upon any Note
executed by the Company

                                      -8-
<PAGE>

shall be conclusive evidence that the Note so authenticated has been duly
authenticated and delivered hereunder and that the holder is entitled to the
benefits of this Indenture.

     In case any officer of the Company who shall have signed any of the Notes
shall cease to be such officer before the Notes so signed shall have been
authenticated and delivered by the Trustee, or disposed of by the Company, such
Notes nevertheless may be authenticated and delivered or disposed of as though
the person who signed such Notes had not ceased to be such officer of the
Company, and any Note may be signed on behalf of the Company by such persons as,
at the actual date of the execution of such Note, shall be the proper officers
of the Company, although at the date of the execution of this Indenture any such
person was not such an officer.

     Section 2.5.  Exchange and Registration of Transfer of Notes; Restrictions
                   ------------------------------------------------------------
on Transfer; Depositary.
-----------------------

          (a)  The Company shall cause to be kept at the Corporate Trust Office
a register (the register maintained in such office and in any other office or
agency of the Company designated pursuant to Section 5.2 being herein sometimes
collectively referred to as the "Note register") in which, subject to such
reasonable regulations as it may prescribe, the Company shall provide for the
registration of Notes and of transfers of Notes. The Note register shall be in
written form or in any form capable of being converted into written form within
a reasonably prompt period of time. The Trustee is hereby appointed "Note
registrar" for the purpose of registering Notes and transfers of Notes as herein
provided. The Company may appoint one or more co-registrars in accordance with
Section 5.2.

     Upon surrender for registration of transfer of any Note to the Note
registrar or any co-registrar, and satisfaction of the requirements for such
transfer set forth in this Section 2.5, the Company shall execute, and the
Trustee shall authenticate and deliver, in the name of the designated transferee
or transferees, one or more new Notes of any authorized denominations and of a
like aggregate principal amount and bearing such restrictive legends as may be
required by this Indenture.

     Notes may be exchanged for other Notes of any authorized denominations and
of a like aggregate principal amount, upon surrender of the Notes to be
exchanged at any such office or agency maintained by the Company pursuant to
Section 5.2.  Whenever any Notes are so surrendered for exchange, the Company
shall execute, and the Trustee shall authenticate and deliver, the Notes which
the Noteholder making the exchange is entitled to receive bearing registration
numbers not contemporaneously outstanding.

     All Notes issued upon any registration of transfer or exchange of Notes
shall be the valid obligations of the Company, evidencing the same debt, and
entitled to the same benefits under this Indenture, as the Notes surrendered
upon such registration of transfer or exchange.

     All Notes presented or surrendered for registration of transfer or for
exchange, redemption or conversion shall (if so required by the Company or the
Note registrar) be duly endorsed, or be accompanied by a written instrument or
instruments of transfer in form satisfactory to the Company, and the Notes shall
be duly executed by the Noteholder thereof or his attorney duly authorized in
writing.

     No service charge shall be made to any holder for any registration of
transfer or exchange of Notes, but the Company may require payment by the holder
of a sum sufficient to cover any tax, assessment or other governmental charge
that may be imposed in connection with any registration of transfer or exchange
of Notes.

                                      -9-
<PAGE>

     Neither the Company nor the Trustee nor any Note registrar shall be
required to exchange or register a transfer of (a) any Notes for a period of
fifteen (15) days next preceding any selection of Notes to be redeemed, (b) any
Notes or portions thereof called for redemption pursuant to Section 3.2, (c) any
Notes or portions thereof surrendered for conversion pursuant to Article Fifteen
or (d) any Notes or portions thereof tendered for redemption (and not withdrawn)
pursuant to Section 3.5.

          (b)  So long as the Notes are eligible for book-entry settlement with
the Depositary, or unless otherwise required by law, all Notes that, upon
initial issuance are beneficially owned by QIBs or as a result of a sale or
transfer after initial issuance are beneficially owned by QIBs, will be
represented by one or more Notes in global form registered in the name of the
Depositary or the nominee of the Depositary (the "Global Note"), except as
otherwise specified below. The transfer and exchange of beneficial interests in
any such Global Note shall be effected through the Depositary in accordance with
this Indenture and the procedures of the Depositary therefor. The Trustee shall
make appropriate endorsements to reflect increases or decreases in the principal
amounts of any such Global Note as set forth on the face of the Note ("Principal
Amount") to reflect any such transfers. Except as provided below, beneficial
owners of a Global Note shall not be entitled to have certificates registered in
their names, will not receive or be entitled to receive physical delivery of
certificates in definitive form and will not be considered holders of such
Global Note.

          (c)  So long as the Notes are eligible for book-entry settlement with
the Depositary, or unless otherwise required by law, upon any transfer of a
definitive Note to a QIB in accordance with Rule 144A, and upon receipt of the
definitive Note or Notes being so transferred, together with a certification,
substantially in the form on the reverse of the Note, from the transferor that
the transfer is being made in compliance with Rule 144A (or other evidence
satisfactory to the Trustee), the Trustee shall make an endorsement on the
Global Note to reflect an increase in the aggregate Principal Amount of the
Notes represented by such Global Note, and the Trustee shall cancel such
definitive Note or Notes in accordance with the standing instructions and
procedures of the Depositary, the aggregate Principal Amount of the Notes
represented by such Global Note to be increased accordingly; provided, however,
that no definitive Note, or portion thereof, in respect of which the Company or
an Affiliate of the Company held any beneficial interest shall be included in
such Global Note until such definitive Note is freely tradable in accordance
with Rule 144(k) under the Securities Act, provided further that the Trustee
shall issue Notes in definitive form upon any transfer of a beneficial interest
in the Global Note to the Company or any Affiliate of the Company.

     Upon any sale or transfer of a Note to an Institutional Accredited Investor
(other than pursuant to a registration statement that has been declared
effective under the Securities Act), such Institutional Accredited Investor
shall, prior to such sale or transfer, furnish to the Company and/or the Trustee
a signed letter containing representations and agreements relating to
restrictions on transfer substantially in the form set forth in Exhibit B to
                                                                ---------
this Indenture.  Upon any transfer of a beneficial interest in the Global Note
to an Institutional Accredited Investor, the Trustee shall make an endorsement
on the Global Note to reflect a decrease in the aggregate Principal Amount of
the Notes represented by such Global Note, and the Company shall execute a
definitive Note or Notes in exchange therefore, and the Trustee, upon receipt of
such definitive Note or Notes and the written order of the Company, shall
authenticate and deliver such, definitive Note or Notes.

     Any Global Note may be endorsed with or have incorporated in the text
thereof such legends or recitals or changes not inconsistent with the provisions
of this Indenture as may be required by the Custodian, the Depositary or by the
National Association of Securities Dealers, Inc. in order for the Notes to be
tradeable on The Portal Market or as may be required for the Notes to be
tradeable on any other market developed for trading of securities pursuant to
Rule 144A or required to comply with any applicable law or any regulation
thereunder or with the rules and regulations of any securities exchange or
automated quotation system upon

                                      -10-
<PAGE>

which the Notes may be listed or traded or to conform with any usage with
respect thereto, or to indicate any special limitations or restrictions to which
any particular Notes are subject.

          (d)  Every Note that bears or is required under this Section 2.5(d) to
bear the legend set forth in this Section 2.5(d) (together with any Common Stock
issued upon conversion of the Notes and required to bear the legend set forth in
Section 2.5(e), collectively, the "Restricted Securities") shall be subject to
the restrictions on transfer set forth in this Section 2.5(d) (including those
set forth in the legend set forth below) unless such restrictions on transfer
shall be waived by written consent of the Company, and the holder of each such
Restricted Security, by such Noteholder's acceptance thereof, agrees to be bound
by all such restrictions on transfer. As used in Sections 2.5(d) and 2.5(e), the
term "transfer" encompasses any sale, pledge, loan, transfer or other
disposition whatsoever of any Restricted Security.

     Until the expiration of the holding period applicable to sales thereof
under Rule 144(k) under the Securities Act (or any successor provision), any
certificate evidencing such Note (and all securities issued in exchange therefor
or substitution thereof, other than Common Stock, if any, issued upon conversion
thereof, which shall bear the legend set forth in Section 2.5(e), if applicable)
shall bear a legend in substantially the following form, unless such Note has
been sold pursuant to a registration statement that has been declared effective
under the Securities Act (and which continues to be effective at the time of
such transfer), or unless otherwise agreed by the Company in writing, with
written notice thereof to the Trustee:

          THE NOTE EVIDENCED HEREBY HAS NOT BEEN REGISTERED UNDER THE UNITED
     STATES SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY
     STATE SECURITIES LAWS, AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD WITHIN
     THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS
     EXCEPT AS SET FORTH IN THE FOLLOWING SENTENCE.  BY ITS ACQUISITION HEREOF,
     THE HOLDER (1) REPRESENTS THAT (A) IT IS A "QUALIFIED INSTITUTIONAL BUYER"
     (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR (B) IT IS AN
     INSTITUTIONAL "ACCREDITED INVESTOR" (AS DEFINED IN RULE 501(A)(1), (2), (3)
     OR (7) UNDER THE SECURITIES ACT) ("INSTITUTIONAL ACCREDITED INVESTOR"); (2)
     AGREES THAT IT WILL NOT, PRIOR TO EXPIRATION OF THE HOLDING PERIOD
     APPLICABLE TO SALES OF THE NOTE EVIDENCED HEREBY UNDER RULE 144(K) UNDER
     THE SECURITIES ACT (OR ANY SUCCESSOR PROVISION), RESELL OR OTHERWISE
     TRANSFER THE NOTE EVIDENCED HEREBY OR THE COMMON STOCK ISSUABLE UPON
     CONVERSION OF SUCH NOTE EXCEPT (A) TO AT HOME CORPORATION OR ANY SUBSIDIARY
     THEREOF, (B) INSIDE THE UNITED STATES TO A QUALIFIED INSTITUTIONAL BUYER IN
     COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) INSIDE THE UNITED
     STATES TO AN INSTITUTIONAL ACCREDITED INVESTOR THAT, PRIOR TO SUCH
     TRANSFER, FURNISHES TO STATE STREET BANK AND TRUST COMPANY OF CALIFORNIA,
     N.A., AS TRUSTEE (OR A SUCCESSOR TRUSTEE, AS APPLICABLE), A SIGNED LETTER
     CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE
     RESTRICTIONS ON TRANSFER OF THE NOTE EVIDENCED HEREBY (THE FORM OF WHICH
     LETTER CAN BE OBTAINED FROM SUCH TRUSTEE OR A SUCCESSOR TRUSTEE, AS
     APPLICABLE), (D) OUTSIDE THE UNITED STATES IN COMPLIANCE WITH RULE 904
     UNDER THE SECURITIES ACT, (E) PURSUANT

                                      -11-
<PAGE>

     TO THE EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE
     SECURITIES ACT (IF AVAILABLE) OR (F) PURSUANT TO A REGISTRATION STATEMENT
     WHICH HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT (AND WHICH
     CONTINUES TO BE EFFECTIVE AT THE TIME OF SUCH TRANSFER); (3) PRIOR TO SUCH
     TRANSFER (OTHER THAN A TRANSFER PURSUANT TO CLAUSE (2)(F) ABOVE), IT WILL
     FURNISH TO STATE STREET BANK AND TRUST COMPANY OF CALIFORNIA, N.A., AS
     TRUSTEE (OR A SUCCESSOR TRUSTEE, AS APPLICABLE), SUCH CERTIFICATIONS, LEGAL
     OPINIONS OR OTHER INFORMATION AS THE TRUSTEE MAY REASONABLY REQUIRE TO
     CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR
     IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE
     SECURITIES ACT; AND (4) AGREES THAT IT WILL DELIVER TO EACH PERSON TO WHOM
     THE NOTE EVIDENCED HEREBY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE
     EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER OF THE NOTE
     EVIDENCED HEREBY PRIOR TO THE EXPIRATION OF THE HOLDING PERIOD APPLICABLE
     TO SALES OF THE NOTE EVIDENCED HEREBY UNDER RULE 144(K) UNDER THE
     SECURITIES ACT (OR ANY SUCCESSOR PROVISION), THE HOLDER MUST CHECK THE
     APPROPRIATE BOX SET FORTH ON THE REVERSE HEREOF RELATING TO THE MANNER OF
     SUCH TRANSFER AND SUBMIT THIS CERTIFICATE TO STATE STREET BANK AND TRUST
     COMPANY OF CALIFORNIA, N.A., AS TRUSTEE (OR A SUCCESSOR TRUSTEE, AS
     APPLICABLE). IF THE PROPOSED TRANSFEREE IS AN INSTITUTIONAL ACCREDITED
     INVESTOR OR IS A PURCHASER WHO IS NOT A U.S. PERSON, THE HOLDER MUST, PRIOR
     TO SUCH TRANSFER, FURNISH TO STATE STREET BANK AND TRUST COMPANY OF
     CALIFORNIA, N.A., AS TRUSTEE (OR A SUCCESSOR TRUSTEE, AS APPLICABLE), SUCH
     CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS SUCH TRUSTEE MAY
     REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO
     AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION
     REQUIREMENTS OF THE SECURITIES ACT. THIS LEGEND WILL BE REMOVED UPON THE
     EARLIER OF THE TRANSFER OF THE NOTE EVIDENCED HEREBY PURSUANT TO CLAUSE
     (2)(F) ABOVE OR UPON ANY TRANSFER OF THE NOTE EVIDENCED HEREBY UNDER RULE
     144(K) UNDER THE SECURITIES ACT (OR ANY SUCCESSOR PROVISION). AS USED
     HEREIN, THE TERMS "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS GIVEN
     TO THEM BY REGULATION S UNDER THE SECURITIES ACT.

     Any Note (or security issued in exchange or substitution therefor) as to
which such restrictions on transfer shall have expired in accordance with their
terms or as to conditions for removal of the foregoing legend set forth therein
have been satisfied may, upon surrender of such Note for exchange to the Note
registrar in accordance with the provisions of this Section 2.5, be exchanged
for a new Note or Notes, of like tenor and aggregate principal amount, which
shall not bear the restrictive legend required by this Section 2.5(d).

                                      -12-
<PAGE>

     Notwithstanding any other provisions of this Indenture (other than the
provisions set forth in the second paragraph of Section 2.5(c) and in this
Section 2.5(d)), a Global Note may not be transferred as a whole or in part
except by the Depositary to a nominee of the Depositary or by a nominee of the
Depositary to the Depositary or another nominee of the Depositary or by the
Depositary or any such nominee to a successor Depositary or a nominee of such
successor Depositary.

     The Depositary shall be a clearing agency registered under the Exchange
Act.  The Company initially appoints The Depository Trust Company to act as
Depositary with respect to the Notes in global form.  Initially, the Global Note
shall be issued to the Depositary, registered in the name of Cede & Co., as the
nominee of the Depositary, and deposited with the Custodian for Cede & Co.

     If at any time the Depositary for a Global Note notifies the Company that
it is unwilling or unable to continue as Depositary for such Note, the Company
may appoint a successor Depositary with respect to such Note.  If a successor
Depositary is not appointed by the Company within ninety (90) days after the
Company receives such notice, the Company will execute, and the Trustee, upon
receipt of an Officers' Certificate for the authentication and delivery of
Notes, will authenticate and deliver, Notes in certificated form, in aggregate
principal amount equal to the principal amount of such Global Note, in exchange
for such Global Note.

     If a Note in certificated form is issued in exchange for any portion of a
Global Note after the close of business at the office or agency where such
exchange occurs on any record date and before the opening of business at such
office or agency on the next succeeding interest payment date, interest will not
be payable on such interest payment date in respect of such certificated Note,
but will be payable on such interest payment date, subject to the provisions of
Section 2.3, only to the Person to whom interest in respect of such portion of
such Global Note is payable in accordance with the provisions of this Indenture.

     Notes in certificated form issued in exchange for all or a part of a Global
Note pursuant to this Section 2.5 shall be registered in such names and in such
authorized denominations as the Depositary, pursuant to instructions from its
direct or indirect participants or otherwise, shall instruct the Trustee.  Upon
execution and authentication, the Trustee shall deliver such Notes in
certificated form to the Persons in whose names such Notes in certificated form
are so registered.

     At such time as all interests in a Global Note have been redeemed,
converted, canceled, exchanged for Notes in certificated form, or transferred to
a transferee who receives Notes in certificated form thereof, such Global Note
shall, upon receipt thereof, be canceled by the Trustee in accordance with
standing procedures and instructions existing between the Depositary and the
Custodian.  At any time prior to such cancellation, if any interest in a Global
Note is exchanged for Notes in certificated form, redeemed, converted,
repurchased or canceled, or transferred to a transferee who receives Notes in
certificated form therefor or any Note in certificated form is exchanged or
transferred for part of a Global Note, the principal amount of such Global Note
shall, in accordance with the standing procedures and instructions existing
between the Depositary and the Custodian, be appropriately reduced or increased,
as the case may be, and an endorsement shall be made on such Global Note, by the
Trustee or the Custodian, at the direction of the Trustee, to reflect such
reduction or increase.

          (e)  Until the expiration of the holding period applicable to sales
thereof under Rule 144(k) under the Securities Act (or any successor provision),
any stock certificate representing Common Stock issued upon conversion of any
Note shall bear a legend in substantially the following form, unless such Common
Stock has been sold pursuant to a registration statement that has been declared
effective under the Securities Act (and which continues to be effective at the
time of such transfer) or such Common Stock has

                                      -13-
<PAGE>

been issued upon conversion of Notes that have been transferred pursuant to a
registration statement that has been declared effective under the Securities
Act, or unless otherwise agreed by the Company in writing with written notice
thereof to the transfer agent:

          THE COMMON STOCK EVIDENCED HEREBY HAS NOT BEEN REGISTERED UNDER THE
     UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR
     ANY STATE SECURITIES LAWS, AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD
     WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S.
     PERSONS EXCEPT AS SET FORTH IN THE FOLLOWING SENTENCE.  THE HOLDER HEREOF
     AGREES THAT, UNTIL THE EXPIRATION OF THE HOLDING PERIOD APPLICABLE TO SALES
     OF THE COMMON STOCK EVIDENCED HEREBY UNDER RULE 144(K) UNDER THE SECURITIES
     ACT (OR ANY SUCCESSOR PROVISION), (1) IT WILL NOT RESELL OR OTHERWISE
     TRANSFER THE COMMON STOCK EVIDENCED HEREBY EXCEPT (A) TO AT HOME
     CORPORATION OR ANY SUBSIDIARY THEREOF, (B) INSIDE THE UNITED STATES TO A
     "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE
     SECURITIES ACT) IN COMPLIANCE WITH RULE 144A, (C) INSIDE THE UNITED STATES
     TO AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS DEFINED IN RULE 501(A)(1),
     (2), (3) OR (7) UNDER THE SECURITIES ACT) THAT PRIOR TO SUCH TRANSFER,
     FURNISHES TO BOSTON EQUISERVE, L.P., AS TRANSFER AGENT (OR A SUCCESSOR
     TRANSFER AGENT, AS APPLICABLE), A SIGNED LETTER CONTAINING CERTAIN
     REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF
     THE COMMON STOCK EVIDENCED HEREBY (THE FORM OF WHICH LETTER CAN BE OBTAINED
     FROM SUCH TRANSFER AGENT OR A SUCCESSOR TRANSFER AGENT, AS APPLICABLE), (D)
     OUTSIDE THE UNITED STATES IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES
     LAWS (E) PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144
     UNDER THE SECURITIES ACT (IF AVAILABLE), OR (F) PURSUANT TO A REGISTRATION
     STATEMENT WHICH HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT (AND
     WHICH CONTINUES TO BE EFFECTIVE AT THE TIME OF SUCH TRANSFER); (2) PRIOR TO
     SUCH TRANSFER (OTHER THAN A TRANSFER PURSUANT TO CLAUSE (1)(F) ABOVE), IT
     WILL FURNISH TO BOSTON EQUISERVE, L.P., AS TRANSFER AGENT (OR A SUCCESSOR
     TRANSFER AGENT, AS APPLICABLE), SUCH CERTIFICATIONS, LEGAL OPINIONS OR
     OTHER INFORMATION AS SUCH TRANSFER AGENT MAY REASONABLY REQUIRE TO CONFIRM
     THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A
     TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES
     ACT; AND (3) IT WILL DELIVER TO EACH PERSON TO WHOM THE COMMON STOCK
     EVIDENCED HEREBY IS TRANSFERRED (OTHER THAN A TRANSFER PURSUANT TO CLAUSE
     1(F) ABOVE) A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IF THE
     PROPOSED TRANSFEREE IS AN INSTITUTIONAL ACCREDITED INVESTOR OR IS A
     PURCHASER WHO IS NOT A U.S. PERSON, THE HOLDER MUST, PRIOR TO SUCH
     TRANSFER, FURNISH TO BOSTON EQUISERVE, L.P. (OR A SUCCESSOR TRANSFER AGENT,
     AS APPLICABLE), SUCH CERTIFICATIONS, LEGAL

                                      -14-
<PAGE>

     OPINIONS OR OTHER INFORMATION AS IT MAY REASONABLY REQUIRE TO CONFIRM THAT
     SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A
     TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES
     ACT. THIS LEGEND WILL BE REMOVED UPON THE EARLIER OF THE TRANSFER OF THE
     COMMON STOCK EVIDENCED HEREBY PURSUANT TO CLAUSE (1)(E) ABOVE OR UPON ANY
     TRANSFER OF THE COMMON STOCK EVIDENCED HEREBY AFTER THE EXPIRATION OF THE
     HOLDING PERIOD APPLICABLE TO SALES OF THE SECURITY EVIDENCED HEREBY UNDER
     RULE 144(K) UNDER THE SECURITIES ACT (OR ANY SUCCESSOR PROVISION). AS USED
     HEREIN, THE TERMS "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS GIVEN
     TO THEM BY REGULATION S UNDER THE SECURITIES ACT.

     Any such Common Stock as to which such restrictions on transfer shall have
expired in accordance with their terms or as to which the conditions for removal
of the foregoing legend set forth therein have been satisfied may, upon
surrender of the certificates representing such shares of Common Stock for
exchange in accordance with the procedures of the transfer agent for the Common
Stock, be exchanged for a new certificate or certificates for a like number of
shares of Common Stock, which shall not bear the restrictive legend required by
this Section 2.5(e).

          (f)  Any Note or Common Stock issued upon the conversion or exchange
of a Note that, prior to the expiration of the holding period applicable to
sales thereof under Rule 144(k) under the Securities Act (or any successor
provision), is purchased or owned by the Company or any Affiliate thereof may
not be resold by the Company or such Affiliate unless registered under the
Securities Act or resold pursuant to an exemption from the registration
requirements of the Securities Act in a transaction which results in such Notes
or Common Stock, as the case may be, no longer being "restricted securities" (as
defined under Rule 144).

     Section 2.6.  Mutilated, Destroyed, Lost or Stolen Notes.  In case any Note
                   ------------------------------------------
shall become mutilated or be destroyed, lost or stolen, the Company in its
discretion may execute, and upon its written request the Trustee or an
authenticating agent appointed by the Trustee shall authenticate and make
available for delivery, a new Note, bearing a number not contemporaneously
outstanding, in exchange and substitution for the mutilated Note, or in lieu of
and in substitution for the Note so destroyed, lost or stolen. In every case the
applicant for a substituted Note shall furnish to the Company, to the Trustee
and, if applicable, to such authenticating agent such security or indemnity as
may be required by them to save each of them harmless for any loss, liability,
cost or expense caused by or connected with such substitution, and, in every
case of destruction, loss or theft, the applicant shall also furnish to the
Company, to the Trustee and, if applicable, to such authenticating agent
evidence to their satisfaction of the destruction, loss or theft of such Note
and of the ownership thereof.

     Following receipt by the Trustee or such authenticating agent, as the case
may be, of satisfactory security or indemnity and evidence, as described in the
preceding paragraph, the Trustee or such authenticating agent may authenticate
any such substituted Note and make available for delivery such Note.  Upon the
issuance of any substituted Note, the Company may require the payment by the
holder of a sum sufficient to cover any tax, assessment or other governmental
charge that may be imposed in relation thereto and any other expenses connected
therewith.  In case any Note which has matured or is about to mature or has been
called for redemption or has been tendered for redemption (and not withdrawn) or
is to be converted into Common Stock shall become mutilated or be destroyed,
lost or stolen, the Company may, instead of issuing a

                                      -15-
<PAGE>

substitute Note, pay or authorize the payment of or convert or authorize the
conversion of the same (without surrender thereof except in the case of a
mutilated Note), as the case may be, if the applicant for such payment or
conversion shall furnish to the Company, to the Trustee and, if applicable, to
such authenticating agent such security or indemnity as may be required by them
to save each of them harmless for any loss, liability, cost or expense caused by
or connected with such substitution, and, in every case of destruction, loss or
theft, the applicant shall also furnish to the Company, the Trustee and, if
applicable, any paying agent or conversion agent evidence to their satisfaction
of the destruction, loss or theft of such Note and of the ownership thereof.

     Every substitute Note issued pursuant to the provisions of this Section 2.6
by virtue of the fact that any Note is destroyed, lost or stolen shall
constitute an additional contractual obligation of the Company, whether or not
the destroyed, lost or stolen Note shall be found at any time, and shall be
entitled to all the benefits of (but shall be subject to all the limitations set
forth in) this Indenture equally and proportionately with any and all other
Notes duly issued hereunder.  To the extent permitted by law, all Notes shall be
held and owned upon the express condition that the foregoing provisions are
exclusive with respect to the replacement or payment or conversion of mutilated,
destroyed, lost or stolen Notes and shall preclude any and all other rights or
remedies notwithstanding any law or statute existing or hereafter enacted to the
contrary with respect to the replacement or payment or conversion of negotiable
instruments or other securities without their surrender.

     Section 2.7.  Temporary Notes.  Pending the preparation of Notes in
                   ---------------
certificated form, the Company may execute and the Trustee or an authenticating
agent appointed by the Trustee shall, upon the written request of the Company,
authenticate and deliver temporary Notes (printed or lithographed). Temporary
Notes shall be issuable in any authorized denomination, and substantially in the
form of the Notes in certificated form, but with such omissions, insertions and
variations as may be appropriate for temporary Notes, all as may be determined
by the Company. Every such temporary Note shall be executed by the Company and
authenticated by the Trustee or such authenticating agent upon the same
conditions and in substantially the same manner, and with the same effect, as
the Notes in certificated form. Without unreasonable delay the Company will
execute and deliver to the Trustee or such authenticating agent Notes in
certificated form (other than in the case of Notes in global form) and thereupon
any or all temporary Notes (other than any such Global Note) may be surrendered
in exchange therefor, at each office or agency maintained by the Company
pursuant to Section 5.2 and the Trustee or such authenticating agent shall
authenticate and make available for delivery in exchange for such temporary
Notes an equal aggregate principal amount of Notes in certificated form. Such
exchange shall be made by the Company at its own expense and without any charge
therefor. Until so exchanged, the temporary Notes shall in all respects be
entitled to the same benefits and subject to the same limitations under this
Indenture as Notes in certificated form authenticated and delivered hereunder.

     Section 2.8.  Cancellation of Notes Paid, Etc.  All Notes surrendered for
                   -------------------------------
the purpose of payment, redemption, conversion, exchange or registration of
transfer shall, if surrendered to the Company or any paying agent or any Note
registrar or any conversion agent, be surrendered to the Trustee and promptly
canceled by it, or, if surrendered to the Trustee, shall be promptly canceled by
it, and no Notes shall be issued in lieu thereof except as expressly permitted
by any of the provisions of this Indenture. The Trustee shall dispose of such
canceled Notes in accordance with its customary procedures. If the Company shall
acquire any of the Notes, such acquisition shall not operate as a redemption or
satisfaction of the indebtedness represented by such Notes unless and until the
same are delivered to the Trustee for cancellation.

     Section 2.9.  CUSIP Numbers.  The Company in issuing the Notes may use
                   -------------
"CUSIP" numbers (if then generally in use), and, if so, the Trustee shall use
"CUSIP" numbers in notices of redemption as a

                                      -16-
<PAGE>

convenience to Noteholders; provided, however, that any such notice may state
that no representation is made as to the correctness of such numbers either as
printed on the Notes or as contained in any notice of a redemption and that
reliance may be placed only on the other identification numbers printed on the
Notes, and any such redemption shall not be affected by any defect in or
omission of such numbers. The Company will promptly notify the Trustee of any
change in the "CUSIP" numbers.

                                 ARTICLE THREE

                              REDEMPTION OF NOTES

     Section 3.1.  (a)  Initial Prohibition on Redemption.  Except as otherwise
                        ---------------------------------
provided in Section 3.5, the Notes may not be redeemed by the Company, in whole
or in part, at any time prior to December 20, 2002.

          (b) Optional Redemption by the Company.  At any time on or after
              ----------------------------------
December 20, 2002, and prior to maturity, the Notes may be redeemed at the
option of the Company, in whole or in part, upon notice as set forth in Section
3.2, at the following redemption prices (expressed as percentages of the
principal amount), together in each case with accrued and unpaid interest, if
any (including Liquidated Damages, if any) to, but excluding, the date fixed for
redemption:
<TABLE>
<CAPTION>
Period                                                                                Redemption Price
------                                                                                ----------------
<S>                                                                                  <C>
Beginning on December 20, 2002 and ending on December 14, 2003...............              102.714%
Beginning on December 15, 2003 and ending on December 14, 2004...............              102.036
Beginning on December 15, 2004 and ending on December 14, 2005...............              101.357
Beginning on December 15, 2005 and ending on December 14, 2006...............              100.679
</TABLE>

and 100% on December 15, 2006; provided, however, that if the date fixed for
redemption is on a June 15 or December 15, then the interest payable on such
date shall be paid to the holder of record on the preceding June 1 or December
1, respectively.

     Section 3.2.  Notice of Redemptions; Selection of Notes. In case the
                   -----------------------------------------
Company shall desire to exercise the right to redeem all or, as the case may be,
any part of the Notes pursuant to Section 3.1, it shall fix a date for
redemption and it or, at its written request received by the Trustee not fewer
than forty-five (45) days prior (or such shorter period of time as may be
acceptable to the Trustee) to the date fixed for redemption, the Trustee in the
name of and at the expense of the Company, shall mail or cause to be mailed a
notice of such redemption not fewer than thirty (30) nor more than sixty (60)
days prior to the date fixed for redemption to the holders of Notes so to be
redeemed as a whole or in part at their last addresses as the same appear on the
Note register; provided, however, that if the Company shall give such notice, it
shall also give written notice, and written notice of the Notes to be redeemed,
to the Trustee. Such mailing shall be by first class mail. The notice if mailed
in the manner herein provided shall be conclusively presumed to have been duly
given, whether or not the holder receives such notice. In any case, failure to
give such notice by mail or any defect in the notice to the holder of any Note
designated for redemption as a whole or in part shall not affect the validity of
the proceedings for the redemption of any other Note. Concurrently with the
mailing of any such notice of redemption, the Company shall issue a press
release announcing such redemption, the form and content of which press release
shall be determined by the Company in its sole discretion. The failure to issue
any such press release or any defect therein shall not affect the validity of
the redemption notice or any of the proceedings for the redemption of any Note
called for redemption.

                                      -17-
<PAGE>

     Each such notice of redemption shall specify the aggregate principal amount
of Notes to be redeemed, the CUSIP number or numbers of the Notes being
redeemed, the date fixed for redemption (which shall be a Business Day), the
redemption price at which Notes are to be redeemed, the place or places of
payment, that payment will be made upon presentation and surrender of such
Notes, that interest accrued to the date fixed for redemption will be paid as
specified in said notice, and that on and after said date interest thereon or on
the portion thereof to be redeemed will cease to accrue.  Such notice shall also
state the current Conversion Price and the date on which the right to convert
such Notes or portions thereof into Common Stock will expire.  If fewer than all
the Notes are to be redeemed, the notice of redemption shall identify the Notes
to be redeemed (including CUSIP numbers, if any).  In case any Note is to be
redeemed in part only, the notice of redemption shall state the portion of the
principal amount thereof to be redeemed and shall state that, on and after the
date fixed for redemption, upon surrender of such Note, a new Note or Notes in
principal amount equal to the unredeemed portion thereof will be issued.

     On or prior to the redemption date specified in the notice of redemption
given as provided in this Section 3.2, the Company will deposit with the Trustee
or with one or more paying agents (or, if the Company is acting as its own
paying agent, set aside, segregate and hold in trust as provided in Section 5.4)
an amount of money in immediately available funds sufficient to redeem on the
redemption date all the Notes (or portions thereof) so called for redemption
(other than those theretofore surrendered for conversion into Common Stock) at
the appropriate redemption price, together with accrued interest to, but
excluding, the date fixed for redemption; provided, however, that if such
payment is made on the redemption date it must be received by the Trustee or
paying agent, as the case may be, by 10:00 a.m. New York City time on such date.
The Company shall be entitled to retain any interest, yield or gain on amounts
deposited with the Trustee or any paying agent pursuant to this Section 3.2 in
excess of amounts required hereunder to pay the redemption price together with
accrued interest to, but excluding, the date fixed for redemption.  If any Note
called for redemption is converted pursuant hereto prior to such redemption, any
money deposited with the Trustee or any paying agent or so segregated and held
in trust for the redemption of such Note shall be paid to the Company upon its
written request, or, if then held by the Company, shall be discharged from such
trust.  Whenever any Notes are to be redeemed, the Company will give the Trustee
written notice in the form of an Officers' Certificate not fewer than forty-five
(45) days (or such shorter period of time as may be acceptable to the Trustee)
prior to the redemption date as to the aggregate principal amount of Notes to be
redeemed.

     If less than all of the outstanding Notes are to be redeemed, the Trustee
shall select the Notes or portions thereof of the Global Note or the Notes in
certificated form to be redeemed (in principal amounts of $1,000 or integral
multiples thereof) by lot, on a pro rata basis or by another method the Trustee
deems fair and appropriate. If any Note selected for partial redemption is
submitted for conversion in part after such selection, the portion of such Note
submitted for conversion shall be deemed (so far as may be) to be the portion to
be selected for redemption.  The Notes (or portions thereof) so selected shall
be deemed duly selected for redemption for all purposes hereof, notwithstanding
that any such Note is submitted for conversion in part before the mailing of the
notice of redemption.

     Upon any redemption of less than all of the outstanding Notes, the Company
and the Trustee may (but need not), solely for purposes of determining the pro
rata allocation among such Notes as are unconverted and outstanding at the time
of redemption, treat as outstanding any Notes surrendered for conversion during
the period of fifteen (15) days next preceding the mailing of a notice of
redemption and may (but need not) treat as outstanding any Note authenticated
and delivered during such period in exchange for the unconverted portion of any
Note converted in part during such period.

                                      -18-
<PAGE>

   Section 3.3.  Payment of Notes Called for Redemption. If notice of redemption
                 --------------------------------------
has been given as above provided, the Notes or portion of Notes with respect to
which such notice has been given shall, unless converted into Common Stock
pursuant to the terms hereof, become due and payable on the date fixed for
redemption and at the place or places stated in such notice at the applicable
redemption price, together with interest accrued to (but excluding) the date
fixed for redemption, and on and after said date (unless the Company shall
default in the payment of such Notes at the redemption price, together with
interest accrued to said date) interest on the Notes or portion of Notes so
called for redemption shall cease to accrue and, after the close of business on
the Business Day next preceding the date fixed for redemption, such Notes shall
cease to be convertible into Common Stock and, except as provided in Sections
8.5 and 13.4, to be entitled to any benefit or security under this Indenture,
and the holders thereof shall have no right in respect of such Notes except the
right to receive the redemption price thereof and unpaid interest to (but
excluding) the date fixed for redemption. On presentation and surrender of such
Notes at a place of payment in said notice specified, the said Notes or the
specified portions thereof shall be paid and redeemed by the Company at the
applicable redemption price, together with interest accrued thereon to (but
excluding) the date fixed for redemption; provided, however, that if the
applicable redemption date is an interest payment date, the semi-annual payment
of interest becoming due on such date shall be payable to the holders of such
Notes registered as such on the relevant record date instead of the holders
surrendering such Notes for redemption on such date.

     Upon presentation of any Note redeemed in part only, the Company shall
execute and the Trustee shall authenticate and make available for delivery to
the holder thereof, at the expense of the Company, a new Note or Notes, of
authorized denominations, in principal amount equal to the unredeemed portion of
the Notes so presented.

     Notwithstanding the foregoing, the Trustee shall not redeem any Notes or
mail any notice of redemption during the continuance of a default in payment of
interest or premium, if any, on the Notes.  If any Note called for redemption
shall not be so paid upon surrender thereof for redemption, the principal and
premium, if any, shall, until paid or duly provided for, bear interest from the
date fixed for redemption at the rate borne by the Note and such Note shall
remain convertible into Common Stock until the principal and premium, if any,
and interest shall have been paid or duly provided for.

   Section 3.4.  Conversion Arrangement on Call for Redemption. In connection
                 ---------------------------------------------
with any redemption of Notes, the Company may arrange for the purchase and
conversion of any Notes by an agreement with one or more investment bankers or
other purchasers to purchase such Notes by paying to the Trustee in trust for
the Noteholders, on or before the date fixed for redemption, an amount not less
than the applicable redemption price, together with interest accrued to (but
excluding) the date fixed for redemption, of such Notes. Notwithstanding
anything to the contrary contained in this Article Three, the obligation of the
Company to pay the redemption price of such Notes, together with interest
accrued to (but excluding) the date fixed for redemption, shall be deemed to be
satisfied and discharged to the extent such amount is so paid by such
purchasers. If such an agreement is entered into, a copy of which will be filed
with the Trustee prior to the date fixed for redemption, any Notes not duly
surrendered for conversion by the holders thereof may, at the option of the
Company, be deemed, to the fullest extent permitted by law, acquired by such
purchasers from such holders and (notwithstanding anything to the contrary
contained in Article Fifteen) surrendered by such purchasers for conversion, all
as of immediately prior to the close of business on the date fixed for
redemption (and the right to convert any such Notes shall be extended through
such time), subject to payment of the above amount as aforesaid. At the
direction of the Company, the Trustee shall hold and dispose of any such amount
paid to it in the same manner as it would monies deposited with it by the
Company for the redemption of Notes. Without the Trustee's prior written
consent, no arrangement between the Company and

                                      -19-
<PAGE>

such purchasers for the purchase and conversion of any Notes shall increase or
otherwise affect any of the powers, duties, responsibilities or obligations of
the Trustee as set forth in this Indenture.

                                      -20-
<PAGE>

     Section 3.5.   Redemption at Option of Holders.
                    -------------------------------

             (a)  If there shall occur a Fundamental Change at any time prior to
maturity of the Notes, then each Noteholder shall have the right, at such
holder's option, to require the Company to redeem all of such holder's Notes, or
any portion thereof that is an integral multiple of $1,000 principal amount, on
the date (the "Repurchase Date") that is thirty (30) days after the date of the
Company Notice (as defined in Section 3.5(b) below) of such Fundamental Change
(or, if such 30th day is not a Business Day, the next succeeding Business Day)
at a redemption price equal to 100% of the principal amount thereof, together
with accrued interest to (but excluding) the Repurchase Date; provided, however,
that, if such Repurchase Date is a June 15 or December 15, then the interest
payable on such date shall be paid to the holders of record of the Notes on the
next preceding June 1 or December 1, respectively.

     Upon presentation of any Note redeemed in part only, the Company shall
execute and, upon the Company's written direction to the Trustee, the Trustee
shall authenticate and deliver to the holder thereof, at the expense of the
Company, a new Note or Notes, of authorized denominations, in principal amount
equal to the unredeemed portion of the Notes so presented.

             (b)  On or before the tenth day after the occurrence of a
Fundamental Change, the Company or at its written request (which must be
received by the Trustee at least five (5) Business Days prior to the date the
Trustee is requested to give notice as described below, unless the Trustee shall
agree in writing to a shorter period), the Trustee, in the name of and at the
expense of the Company, shall mail or cause to be mailed to all holders of
record on the date of the Fundamental Change a notice (the "Company Notice") of
the occurrence of such Fundamental Change and of the redemption right at the
option of the holders arising as a result thereof. Such notice shall be mailed
in the manner and with the effect set forth in the first paragraph of Section
3.2 (without regard for the time limits set forth therein). If the Company shall
give such notice, the Company shall also deliver a copy of the Company Notice to
the Trustee at such time as it is mailed to Noteholders. Concurrently with the
mailing of any Company Notice, the Company shall issue a press release
announcing such Fundamental Change referred to in the Company Notice, the form
and content of which press release shall be determined by the Company in its
sole discretion. The failure to issue any such press release or any defect
therein shall not affect the validity of the Company Notice or any proceedings
for the redemption of any Note which any Noteholder may elect to have the
Company redeem as provided in this Section 3.5.

     Each Company Notice shall specify the circumstances constituting the
Fundamental Change, the Repurchase Date, the price at which the Company shall be
obligated to redeem Notes, that the holder must exercise the redemption right on
or prior to the close of business on the Repurchase Date (the "Fundamental
Change Expiration Time"), that the holder shall have the right to withdraw any
Notes surrendered prior to the Fundamental Change Expiration Time, a description
of the procedure which a Noteholder must follow to exercise such redemption
right and to withdraw any surrendered Notes, the place or places where the
holder is to surrender such holder's Notes, the amount of interest accrued on
each Note to the Repurchase Date and the "CUSIP" number or numbers of the Notes
(if then generally in use).

     No failure of the Company to give the foregoing notices and no defect
therein shall limit the Noteholders' redemption rights or affect the validity of
the proceedings for the redemption of the Notes pursuant to this Section 3.5.

                                      -21-
<PAGE>

             (c)  For a Note to be so redeemed at the option of the holder, the
Company must receive at the office or agency of the Company maintained for that
purpose or, at the option of such holder, the Corporate Trust Office, such Note
with the form entitled "Option to Elect Repayment Upon A Fundamental Change" on
the reverse thereof duly completed, together with such Notes duly endorsed for
transfer, on or before the Fundamental Change Expiration Time. All questions as
to the validity, eligibility (including time of receipt) and acceptance of any
Note for repayment shall be determined by the Company, whose determination shall
be final and binding absent manifest error.

              (d) On or prior to the Repurchase Date, the Company will deposit
with the Trustee or with one or more paying agents (or, if the Company is acting
as its own paying agent, set aside, segregate and hold in trust as provided in
Section 5.4) an amount of money sufficient to redeem on the Repurchase Date all
the Notes to be redeemed on such date at the appropriate redemption price,
together with accrued interest to (but excluding) the Repurchase Date; provided,
however, that if such payment is made on the Repurchase Date it must be received
by the Trustee or paying agent, as the case may be, by 10:00 a.m. New York City
time, on such date. Payment for Notes surrendered for redemption (and not
withdrawn) prior to the Fundamental Change Expiration Time will be made promptly
(but in no event more than five (5) Business Days) following the Repurchase Date
by mailing checks for the amount payable to the holders of such Notes entitled
thereto as they shall appear on the registry books of the Company.

             (e)  In the case of a reclassification, change, consolidation,
merger, combination, sale or conveyance to which Section 15.6 applies, in which
the Common Stock of the Company is changed or exchanged as a result into the
right to receive stock, securities or other property or assets (including cash),
which includes shares of Common Stock of the Company or shares of common stock
of another Person that are, or upon issuance will be, traded on a United States
national securities exchange or approved for trading on an established automated
over-the-counter trading market in the United States and such shares constitute
at the time such change or exchange becomes effective in excess of 50% of the
aggregate fair market value of such stock, securities or other property or
assets (including cash) (as determined by the Company, which determination shall
be conclusive and binding), then the Person formed by such consolidation or
resulting from such merger or which acquires such assets, as the case may be,
shall execute and deliver to the Trustee a supplemental indenture (accompanied
by an Opinion of Counsel that such supplemental indenture complies with the
Trust Indenture Act as in force at the date of execution of such supplemental
indenture) modifying the provisions of this Indenture relating to the right of
holders of the Notes to cause the Company to redeem the Notes following a
Fundamental Change, including without limitation the applicable provisions of
this Section 3.5 and the definitions of Common Stock and Fundamental Change, as
appropriate, as determined in good faith by the Company (which determination
shall be conclusive and binding), to make such provisions apply to such other
Person if different from the Company and the common stock issued by such Person
(in lieu of the Company and the Common Stock of the Company).

             (f)  The Company will comply with the provisions of Rule 13e-4 and
any other tender offer rules under the Exchange Act to the extent then
applicable in connection with the redemption rights of the holders of Notes in
the event of a Fundamental Change.

             (g)  A "Fundamental Change" shall be deemed to have occurred at
such time as either of the following events shall occur:

                  (i)  There shall be consummated any consolidation or merger of
the Company pursuant to which the Common Stock would be converted into cash,
securities or other property, in each case, other than a consolidation or merger
of the Company in which the holders of Common Equity immediately

                                      -22-
<PAGE>

prior to the consolidation or merger have, directly or indirectly, at least a
majority of the total voting power in the aggregate of all classes of common
stock of the continuing or surviving corporation normally entitled to vote in
elections of directors immediately after such consolidation or merger; or

                  (ii)  There is a report filed by any person, including its
Affiliates and Associates, on Schedule 13D or 14D-1 (or any successor schedule,
form or report) pursuant to the Exchange Act, disclosing that such person (for
the purposes of this Section 3.5 only, the term "person" shall include a
"person" within the meaning of Section 13(d)(3) or Section 14(d)(2) of the
Exchange Act or any successor provision to either of the foregoing) has become
the beneficial owner (as the term "beneficial owner" is defined under Rule 13d-3
or any successor rule or regulation promulgated under the Exchange Act) of 50%
or more of the total voting power in the aggregate of all classes of Common
Equity then outstanding of the Company normally entitled to vote in elections of
directors; provided, however, that a person shall not be deemed beneficial owner
           --------  -------
of, or to own beneficially, (A) any securities tendered pursuant to a tender or
exchange offer made by or on behalf of such person or any of such person's
Affiliates or Associates until such tendered securities are accepted for
purchase or exchange thereunder, or (B) any securities if such beneficial
ownership (1) arises solely as a result of a revocable proxy delivered in
response to a proxy or consent solicitation made pursuant to, and in accordance
with, the applicable rules and regulations under the Exchange Act, and (2) is
not also then reportable on Schedule 13D (or any successor schedule, form or
report) under the Exchange Act; or

                  (iii) The occurrence of any transaction or event in connection
with which all or substantially all Series A Common Stock shall be exchanged
for, converted into, acquired for or constitute solely the right to receive
consideration (whether by means of an exchange offer, liquidation, tender offer,
consolidation, merger, combination, reclassification, recapitalization or
otherwise) all or substantially all of which does not consist of common stock
which is (or, upon consummation of or immediately following such transaction or
event, which will be) listed on a United States national securities exchange or
approved for quotation on the Nasdaq National Market or any similar United
States system of automated dissemination of quotations of securities prices.

     Notwithstanding the foregoing provisions of this Section 3.5, a Fundamental
Change shall not be deemed to have occurred if at any time the Company, any
Subsidiary of the Company, any employee stock ownership plan or any other
employee benefit plan of either the Company or any Subsidiary of the Company, or
any person holding shares of Common Stock for or pursuant to the terms of any
such employee benefit plan, or any Permitted Holder, files or becomes obligated
to file a report under or in response to Schedule 13D or Schedule 14D-1 (or any
successor schedule, form or report) under the Exchange Act disclosing beneficial
ownership by it of 50% or more of the total voting power in the aggregate of all
classes of Common Equity then outstanding of the Company normally entitled to
vote in elections of directors.

     "Associate" shall have the meaning ascribed to such term in Rule 12b-2 of
the General Rules and Regulations under the Exchange Act, as in effect on the
date hereof.

     "Permitted Holder" means (i) Tele-Communications, Inc. a Delaware
corporation ("TCI"), any person or entity which owns, directly or indirectly, a
majority of the total voting power of TCI, and any business entity at least a
majority of the total voting power of which is owned, directly or indirectly, by
TCI or any person or entity which owns, directly or indirectly, a majority of
the total voting power of TCI (but, in each case, only so long as such voting
power is so owned), (ii) AT&T Corp., a New York corporation ("AT&T"), any person
or entity which owns, directly or indirectly, a majority of the total voting
power of AT&T, and any business entity at least a majority of the total voting
power of which is owned, directly or indirectly by

                                      -23-
<PAGE>

AT&T, or any person or entity which owns, directly or indirectly, a majority of
the total voting power of AT&T (but, in each case, only so long as such voting
power is so owned), (iii) any person who is a member of a "group" (as defined
pursuant to Section 13(d)(3) of the Exchange Act) with TCI or AT&T, and (iv) any
person or entity, a majority of the equity interests of which are distributed,
directly or indirectly, to the stockholders of TCI or AT&T, as applicable,
provided that TCI or AT&T own, directly or indirectly, a majority of the equity
interests and voting power of such person or entity immediately prior to such
distribution.

     The provisions of this Section 3.5(g) are subject to the terms of any
supplemental indenture provided for in Section 15.7.

                                 ARTICLE FOUR

                             SUBORDINATION OF NOTES

   Section 4.1.  Notes Subordinate to Senior Indebtedness. The Company covenants
                 ----------------------------------------
and agrees, and each holder of a Note, by his acceptance thereof, likewise
covenants and agrees, that, to the extent and in the manner hereinafter set
forth in this Article Four, the indebtedness represented by the Notes and the
payment of principal of, premium, if any, or interest (including Liquidated
Damages, if any) on each and all of the Notes and all obligations of the Company
under this Indenture are hereby expressly made subordinate and junior in right
of payment to the prior payment in full in cash or other payment satisfactory to
the holders of Senior Indebtedness of all Senior Indebtedness and that said
subordination is for the benefit of the holders of Senior Indebtedness and they
and or each of them severally may enforce such subordination.

   Section 4.2.  Payment Over of Proceeds upon Dissolution, Etc. In the event of
                 ----------------------------------------------
(a) any insolvency or bankruptcy case or proceeding, or any receivership,
liquidation, reorganization or other similar case or proceeding in connection
therewith, relative to the Company or to its creditors, as such, or to its
assets, or (b) any liquidation, dissolution or other winding up of the Company,
whether voluntary or involuntary and whether or not involving insolvency or
bankruptcy, or (c) any assignment for the benefit of creditors or any other
marshaling of assets and liabilities of the Company, then and in any such event
the holders of Senior Indebtedness shall be entitled to receive payment in full
in cash or other payment satisfactory to the holders of Senior Indebtedness of
all amounts due or to become due on or in respect of all Senior Indebtedness, or
provision shall be made for such payment in cash or other payment satisfactory
to the holders of Senior Indebtedness, before the holders of the Notes are
entitled to receive any payment on account of principal of (or premium, if any)
or interest on the Notes, and to that end the holders of Senior Indebtedness
shall be entitled to receive, for application to the payment thereof, any
payment or distribution of any kind or character, whether in cash, property or
securities, which may be payable or deliverable in respect of the Notes in any
such case, proceeding, dissolution, liquidation or other winding up or event.

     In the event that, notwithstanding the foregoing provisions of this
Section, the Trustee or the holder of any Note shall have received any payment
or distribution of assets of the Company of any kind or character, whether in
cash, property or securities, before all Senior Indebtedness is paid in full in
cash or other payment satisfactory to the holders of Senior Indebtedness or
payment thereof provided for in a manner satisfactory to the holders of Senior
Indebtedness, then and in such event such payment or distribution shall be paid
over or delivered forthwith to the trustee in bankruptcy, receiver, liquidating
trustee, custodian, assignee, agent or other Person making payment or
distribution of assets of the Company for application to the payment of all
Senior Indebtedness remaining unpaid, to the extent necessary to pay all Senior
Indebtedness in full in cash or

                                      -24-
<PAGE>

other payment satisfactory to the holders of Senior Indebtedness, after giving
effect to any concurrent payment or distribution to or for the holders of Senior
Indebtedness.

     For purposes of this Article Four only, the words "cash, property or
securities" shall not be deemed to include shares of capital stock of the
Company as reorganized or readjusted, or securities of the Company or any other
corporation provided for by a plan of reorganization or readjustment which in
either case are subordinated in right of payment to all Senior Indebtedness
which may at the time be outstanding to substantially the same extent as, or to
a greater extent than, the Notes are so subordinated as provided in this Article
Four.  The consolidation of the Company with, or the merger of the Company into,
another Person or the liquidation or dissolution of the Company following the
conveyance or transfer of its properties and assets substantially as an entirety
to another Person upon the terms and conditions set forth in Article Twelve
shall not be deemed a dissolution, winding up, liquidation, reorganization,
assignment for the benefit of creditors or marshaling of assets and liabilities
of the Company for the purposes of this Section 4.2 if the Person formed by such
consolidation or into which the Company is merged or which acquires by
conveyance or transfer such properties and assets substantially as an entirety,
as the case may be, shall, as a part of such consolidation, merger, conveyance
or transfer, comply with the conditions set forth in Article Twelve.

     Section 4.3.  No Payment When Senior Indebtedness in Default.
                   ----------------------------------------------

              (a)  The Company may not make any payment of the principal of,
premium, if any, or interest (including Liquidated Damages, if any) in respect
of the Notes nor may the Company pay cash with respect to the redemption price
or acquire any Notes for cash or property (other than for Common Stock of the
Company) if (a) a payment default on any Senior Indebtedness has occurred and is
continuing beyond any applicable grace period with respect thereto; or (b) a
default (other than a default referred to in the preceding clause (a)) on any
Senior Indebtedness occurs and is continuing that permits holders of such Senior
Indebtedness to accelerate the stated maturity thereof and the default is the
subject of judicial proceedings or the Company receives a notice of default
thereof from any Person who may give such notice pursuant to the instrument
evidencing or document governing such Senior Indebtedness. If the Company
receives any such notice, then a similar notice received within nine months
thereafter relating to the same default on the same issue of Senior Indebtedness
shall not be effective for purposes of this Section 4.3.

              The Company may resume payment on the Notes and may acquire Notes
if and when (i) the default referred to above is cured or waived or ceases to
exist; or (ii) in the case of a default referred to in clause (b) of the
preceding paragraph, 179 or more days pass after the receipt by the Company of
the notice described in clause (b) above; and this Article Four otherwise
permits the payment or acquisition at that time.

              Nothing contained in this Article Four or elsewhere in this
Indenture or in any of the Notes shall prevent the conversion by a holder of any
Notes into Common Stock in accordance with the provisions for conversion of such
Notes set forth in this Indenture, including the payment of cash in lieu of
fractional shares of Common Stock in accordance with Article Fifteen, or in any
of such Notes in the event of an occurrence of the events described in this
Section 4.3.

              (b)  In the event that any Notes are declared due and payable
before their stated maturity pursuant to Section 7.1, then and in such event the
Company shall promptly notify holders of Senior Indebtedness of such
acceleration. The Company may not pay the Notes until the earlier of (i) the
passage of 120 or more days have passed after such acceleration occurs or (ii)
the payment in full in cash or other payment satisfactory to the holders of
Senior Indebtedness of all Senior Indebtedness, and may thereafter pay the Notes
if this Article Four permits the payment at that time.

                                      -25-
<PAGE>

        In the event that, notwithstanding the foregoing provisions, any payment
or distribution of assets of the Company of any kind or character, whether in
cash, property or securities (including, without limitation, by way of setoff or
otherwise), prohibited by the foregoing, shall be received by the Trustee or the
holders of the Notes before all Senior Indebtedness of the Company is paid in
full in cash or other payment satisfactory to the holders of such Senior
Indebtedness of the Company, or provision is made for such payment thereof in
accordance with its terms in cash or other payment satisfactory to the holders
of such Senior Indebtedness of the Company, such payment or distribution shall
be held in trust for the benefit of and shall be paid over or delivered to the
holders of Senior Indebtedness of the Company or their representative or
representatives, or to the trustee or trustees under any indenture pursuant to
which any instruments evidencing any Senior Indebtedness of the Company may have
been issued, as their respective interests may appear for application to the
payment of all Senior Indebtedness of the Company remaining unpaid to the extent
necessary to pay all Senior Indebtedness of the Company in full in cash or other
payment satisfactory to the holders of such Senior Indebtedness of the Company,
after giving effect to any concurrent payment or distribution, or provision
therefor, to or for the holders of such Senior Indebtedness of the Company.

        The provisions of this Section 4.3 shall not apply to any payment with
respect to which Section 4.2 would be applicable.

     Section 4.4.  Payment Permitted If No Default. Nothing contained in this
                   -------------------------------
Article Four or elsewhere in this Indenture or in any of the Notes shall prevent
(a) the Company, at any time except during the pendency of any case, proceeding,
dissolution, liquidation or other winding up, assignment for the benefit of
creditors or other marshalling of assets and liabilities of the Company referred
to in Section 4.2 or under the conditions described in Section 4.3, from making
payments at any time of the principal of, premium, if any, or interest
(including Liquidated Damages, if any), as the case may be, on the Notes, or (b)
the application by the Trustee of any money deposited with it hereunder to the
payment of or on account of the principal of, premium, if any, or interest
(including Liquidated Damages, if any), as the case may be, on the Notes or the
retention of such payment by the holders, if, at the time of such application by
the Trustee, it did not have knowledge that such payment would have been
prohibited by the provisions of this Article Four.

     Section 4.5.  Subrogation to Rights of Holders of Senior Indebtedness.
                   -------------------------------------------------------
Subject to the payment in full of all Senior Indebtedness, and until the Notes
are paid in full, the holders of the Notes shall be subrogated (equally and
ratably with the holders of all indebtedness of the Company which by its express
terms is subordinated to indebtedness of the Company to substantially the same
extent as the Notes are subordinated and is entitled to like rights of
subrogation) to the rights of the holders of such Senior Indebtedness to receive
payments and distributions of cash, property and securities applicable to the
Senior Indebtedness to the extent that payments and distributions otherwise
payable to holders of Notes have been applied to the payment of Senior
Indebtedness as provided by this Article Four. For purposes of such subrogation,
no payments or distributions to the holders of the Senior Indebtedness of any
cash, property or securities to which the holders of the Notes or the Trustee
would be entitled, except for the provisions of this Article Four, and no
payments over pursuant to the provisions of this Article Four to the holders of
Senior Indebtedness by holders of the Notes or the Trustee, shall, as among the
Company, its creditors other than holders of Senior Indebtedness and the holders
of the Notes, be deemed to be a payment or distribution by the Company to or on
account of the Senior Indebtedness.

     Section 4.6.  Provisions Solely To Define Relative Rights. The provisions
                   -------------------------------------------
of this Article Four are and are intended solely for the purpose of defining the
relative rights of the holders of the Notes on the one hand and the holders of
Senior Indebtedness on the other hand. Nothing contained in this Article Four or
elsewhere in this Indenture or in the Notes is intended to or shall (a) impair,
as among the Company, its

                                      -26-
<PAGE>

creditors other than holders of Senior Indebtedness and the holders of the
Notes, the obligation of the Company, which is absolute and unconditional (and
which, subject to the rights under this Article Four of the holders of Senior
Indebtedness, is intended to rank equally with all other general obligations of
the Company), to pay to the holders of the Notes the principal of, premium, if
any, or interest (including Liquidated Damages, if any), as the case may be, on
the Notes as and when the same shall become due and payable in accordance with
their terms; or (b) affect the relative rights against the Company of the
holders of the Notes and creditors of the Company other than the holders of
Senior Indebtedness; or (c) prevent the Trustee or the holder of any Note from
exercising all remedies otherwise permitted by applicable law upon default under
this Indenture, subject to the rights, if any, under this Article Four of the
holders of Senior Indebtedness to receive cash, property and securities
otherwise payable or deliverable to the Trustee or such holder.

     Section 4.7.  Trustee To Effectuate Subordination. Each holder of a Note by
                   -----------------------------------
his acceptance thereof authorizes and directs the Trustee on his behalf to take
such action as may be necessary or appropriate to effectuate the subordination
provided in this Article Four and appoints the Trustee his attorney-in-fact for
any and all such purposes.

     Section 4.8.  No Waiver of Subordination Provisions. No right of any
                   -------------------------------------
present or future holder of any Senior Indebtedness to enforce subordination as
herein provided shall at any time in any way be prejudiced or impaired by any
act or failure to act on the part of the Company or by any act or failure to
act, in good faith, by any such holder, or by any non-compliance by the Company
with the terms, provisions and covenants of this Indenture, regardless of any
knowledge thereof any such holder may have or be otherwise charged with.

     Without in any way limiting the generality of the foregoing paragraph, the
holders of Senior Indebtedness may, at any time and from time to time, without
the consent of or notice to the Trustee or the holders of the Notes, without
incurring responsibility to the holders of the Notes and without impairing or
releasing the subordination provided in this Article Four or the obligations
hereunder of the holders of the Notes to the holders of Senior Indebtedness, do
any one or more of the following: (i) change the manner, place or terms of
payment or extend the time of payment of, or renew or alter, Senior
Indebtedness, or otherwise amend or supplement in any manner Senior Indebtedness
or any instrument evidencing the same or any agreement under which Senior
Indebtedness is outstanding; (ii) sell, exchange, release or otherwise deal with
any property pledged, mortgaged or otherwise securing Senior Indebtedness; (iii)
release any Person liable in any manner for the collection of Senior
Indebtedness; (iv) exercise or refrain from exercising any rights against the
Company and any other Person; (v) apply any and all sums received from time to
time to the Senior Indebtedness.

     Section 4.9.  Notice to Trustee. The Company shall give prompt written
                   -----------------
notice to the Trustee of any fact known to the Company which would prohibit the
making of any payment to or by the Trustee in respect of the Notes.
Notwithstanding the provisions of this Article Four or any other provision of
this Indenture, the Trustee shall not be charged with knowledge of the existence
of any facts which would prohibit the making of any payment to or by the Trustee
in respect of the Notes, unless and until the Trustee shall have received
written notice thereof from the Company or a holder of Senior Indebtedness or
from any trustee therefor; and, prior to the receipt of any such written notice,
the Trustee, subject to the provisions of Section 8.1, shall be entitled in all
respects to assume that no such facts exist; provided, however, that if the
                                             --------  -------
Trustee shall not have received the notice provided for in this Section 4.9 at
least two Business Days prior to the date upon which by the terms hereof any
money may become payable for any purpose, then, anything herein contained to the
contrary notwithstanding, the Trustee shall have full power and authority to
receive

                                      -27-
<PAGE>

such money and to apply the same to the purpose for which such money was
received and shall not be affected by any notice to the contrary which may be
received by it within two Business Days prior to such date.

     Subject to the provisions of Section 8.1, the Trustee shall be entitled to
rely on the delivery to it of a written notice by a Person representing himself
to be a holder of Senior Indebtedness (or a trustee therefor) to establish that
such notice has been given by a holder of Senior Indebtedness (or a trustee
therefor).  In the event that the Trustee determines in good faith that further
evidence is required with respect to the right of any Person as a holder of
Senior Indebtedness to participate in any payment or distribution pursuant to
this Article Four, the Trustee may request such Person to furnish evidence to
the reasonable satisfaction of the Trustee as to the amount of Senior
Indebtedness held by such Person, the extent to which such Person is entitled to
participate in such payment or distribution and any other facts pertinent to the
rights of such Person under this Article Four, and if such evidence is not
furnished, the Trustee may defer any payment to such Person pending judicial
determination as to the right of such Person to receive such payment.

     Section 4.10.  Reliance on Judicial Order or Certificate of Liquidating
                    --------------------------------------------------------
Agent.  Upon any payment or distribution of assets of the Company referred
------
to in this Article Four, the Trustee, subject to the provisions of Section 8.1,
and the holders of the Notes shall be entitled to rely upon any order or decree
entered by any court of competent jurisdiction in which such insolvency,
bankruptcy, receivership, liquidation, reorganization, dissolution, winding up
or similar case or proceeding is pending, or a certificate of the trustee in
bankruptcy, receiver, liquidating trustee, custodian, assignee for the benefit
of creditors, agent or other Person making such payment or distribution,
delivered to the Trustee or to the holders of Notes, for the purpose of
ascertaining the Persons entitled to participate in such payment or
distribution, the holders of the Senior Indebtedness and other indebtedness of
the Company, the amount thereof or payable thereon, the amount or amounts paid
or distributed thereon and all other facts pertinent thereto or to this Article
Four.

     Section 4.11.  Trustee Not Fiduciary for Holders of Senior Indebtedness.
                    --------------------------------------------------------
The Trustee shall not be deemed to owe any fiduciary duty to the holders of
Senior Indebtedness and shall not be liable to any such holders if it shall in
good faith mistakenly pay over or distribute to holders of Notes or to the
Company or to any other Person cash, property or securities to which any holders
of Senior Indebtedness shall be entitled by virtue of this Article Four or
otherwise.

     Section 4.12.  Rights of Trustee as Holder of Senior Indebtedness;
                    --------------------------------------------------
Preservation of Trustee's Rights. The Trustee in its individual capacity shall
--------------------------------
be entitled to all the rights set forth in this Article Four with respect to any
Senior Indebtedness which may at any time be held by it, to the same extent as
any other holder of Senior Indebtedness, and nothing in this Indenture shall
deprive the Trustee of any of its rights as such holder.

     Nothing in this Article Four shall apply to claims of, or payments to, the
Trustee under or pursuant to Section 8.6.

     Section 4.13.  Article Applicable to Paying Agents. In case at any time any
               -----------------------------------
paying agent other than the Trustee shall have been appointed by the Company and
be then acting hereunder, the term "Trustee" as used in this Article Four shall
in such case (unless the context otherwise requires) be construed as extending
to and including such paying agent within its meaning as fully for all intents
and purposes as if such paying agent were named in this Article Four in addition
to or in place of the Trustee; provided, however, that Section 4.12 shall not
                               --------  -------
apply to the Company or any Affiliate of the Company if it or such Affiliate
acts as paying agent.

                                      -28-
<PAGE>

     Section 4.14.  Certain Conversions Deemed Payment. For the purposes of this
                    ----------------------------------
Article Four only, (1) the issuance and delivery of junior securities upon
conversion of Notes in accordance with Article Fifteen shall not be deemed to
constitute a payment or distribution on account of the principal of or premium
(if any) or interest on the Notes or on account of the purchase or other
acquisition of Notes, and (2) the payment, issuance or delivery of cash,
property or securities (other than junior securities) upon conversion of a Note
shall be deemed to constitute payment on account of the principal of such Note.
For the purposes of this Section 4.14, the term "junior securities" means (a)
shares of any stock of any class of the Company and (b) securities of the
Company which are subordinated in right of payment to the prior payment in full
of all Senior Indebtedness which may be outstanding at the time of issuance or
delivery of such securities to substantially the same extent as, or to a greater
extent than, the Notes are so subordinated as provided in this Article Four.
Nothing contained in this Article Four or elsewhere in this Indenture or in the
Notes is intended to or shall impair, as among the Company, its creditors other
than holders of Senior Indebtedness and the holders of the Notes, the right,
which is absolute and unconditional, of the holder of any Note to convert such
Note in accordance with Article Fifteen.

                                 ARTICLE FIVE

                      PARTICULAR COVENANTS OF THE COMPANY

     Section 5.1.  Payment of Principal, Premium and Interest. The Company
                   ------------------------------------------
covenants and agrees that it will duly and punctually pay or cause to be paid
the principal of and premium, if any (including the redemption price upon
redemption pursuant to Article Three), and interest (including Liquidated
Damages, if any), on each of the Notes at the places, at the respective times
and in the manner provided herein and in the Notes.

     Section 5.2.  Maintenance of Office or Agency. The Company will maintain an
                   -------------------------------
office or agency in the Borough of Manhattan, the City of New York, where the
Notes may be surrendered for registration of transfer or exchange or for
presentation for payment or for conversion or redemption and where notices and
demands to or upon the Company in respect of the Notes and this Indenture may be
served. The Company will give prompt written notice to the Trustee of the
location, and any change in the location, of such office or agency not
designated or appointed by the Trustee. If at any time the Company shall fail to
maintain any such required office or agency or shall fail to furnish the Trustee
with the address thereof, such presentations, surrenders, notices and demands
may be made or served at the Corporate Trust Office or the office of agency of
the Trustee in The Borough of Manhattan, The City of New York (which shall
initially be located at State Street Bank and Trust Company, N.A., 61 Broadway,
New York, NY 10006, Attention: Corporate Trust Department (At Home Corporation,
4% Convertible Subordinated Notes due 2006).

     The Company may also from time to time designate co-registrars and one or
more offices or agencies where the Notes may be presented or surrendered for any
or all such purposes and may from time to time rescind such designations.  The
Company will give prompt written notice of any such designation or rescission
and of any change in the location of any such other office or agency.

     The Company hereby initially designates the Trustee as paying agent, Note
registrar, Custodian and conversion agent and each of the Corporate Trust Office
and the office of agency of the Trustee in The Borough of Manhattan, The City of
New York (which shall initially be located at State Street Bank and Trust
Company, N.A., 61 Broadway, New York, NY  10006, Attention:  Corporate Trust
Department (At Home Corporation, 4% Convertible Subordinated Notes due 2006)),
shall be considered as one such office or agency of the Company for each of the
aforesaid purposes.

                                      -29-
<PAGE>

     So long as the Trustee is the Note registrar, the Trustee agrees to mail,
or cause to be mailed, the notices set forth in Section 8.10(a) and the third
paragraph of Section 8.11.  If co-registrars have been appointed in accordance
with this Section, the Trustee shall mail such notices only to the Company and
the holders of Notes it can identify from its records.

     Section 5.3.  Appointments to Fill Vacancies in Trustee's Office. The
                   --------------------------------------------------
Company, whenever necessary to avoid or fill a vacancy in the office of Trustee,
will appoint, in the manner provided in Section 8.10, a Trustee, so that there
shall at all times be a Trustee hereunder.

     Section 5.4.  Provisions as to Paying Agent.
                   -----------------------------
             (a)   If the Company shall appoint a paying agent other than the
Trustee, or if the Trustee shall appoint such a paying agent, the Company will
cause such paying agent to execute and deliver to the Trustee an instrument in
which such agent shall agree with the Trustee, subject to the provisions of this
Section 5.4:

                   (1)  that it will hold all sums held by it as such agent for
             the payment of the principal of and premium, if any, or interest
             (including Liquidated Damages, if any) on the Notes (whether such
             sums have been paid to it by the Company or by any other obligor on
             the Notes) in trust for the benefit of the holders of the Notes;

                   (2)  that it will give the Trustee notice of any failure by
             the Company (or by any other obligor on the Notes) to make any
             payment of the principal of and premium, if any, or interest
             (including Liquidated Damages, if any) on the Notes when the same
             shall be due and payable; and

                   (3)  that at any time during the continuance of an Event of
             Default, upon request of the Trustee, it will forthwith pay to the
             Trustee all sums so held in trust.

     The Company shall, on or before each due date of the principal of, premium,
if any, or interest on the Notes, deposit with the paying agent a sum (in funds
which are immediately available on the due date for such payment) sufficient to
pay such principal, premium, if any, or interest, and (unless such paying agent
is the Trustee) the Company will promptly notify the Trustee of any failure to
take such action; provided, however, that if such deposit is made on the due
date, such deposit shall be received by the paying agent by 10:00 a.m. New York
City time, on such date.

             (b)   If the Company shall act as its own paying agent, it will, on
or before each due date of the principal of, premium, if any, or interest
(including Liquidated Damages, if any) on the Notes, set aside, segregate and
hold in trust for the benefit of the holders of the Notes a sum sufficient to
pay such principal, premium, if any, or interest (including Liquidated Damages,
if any) so becoming due and will promptly notify the Trustee of any failure to
take such action and of any failure by the Company (or any other obligor under
the Notes) to make any payment of the principal of, premium, if any, or interest
(including Liquidated Damages, if any) on the Notes when the same shall become
due and payable.

             (c)   Anything in this Section 5.4 to the contrary notwithstanding,
the Company may, at any time, for the purpose of obtaining a satisfaction and
discharge of this Indenture, or for any other reason, pay or cause to be paid to
the Trustee all sums held in trust by the Company or any paying agent hereunder
as required by this Section 5.4, such sums to be held by the Trustee upon the
trusts herein contained and upon

                                      -30-
<PAGE>

such payment by the Company or any paying agent to the Trustee, the Company or
such paying agent shall be released from all further liability with respect to
such sums.

             (d)   Anything in this Section 5.4 to the contrary notwithstanding,
the agreement to hold sums in trust as provided in this Section 5.4 is subject
to Sections 13.3 and 13.4.

     The Trustee shall not be responsible for the actions of any other paying
agents (including the Company if acting as its own paying agent) and shall have
no control of any funds held by such other paying agents.

     Section 5.5.  Existence.  Subject to Article Twelve, the Company will do or
                   ---------
cause to be done all things necessary to preserve and keep in full force and
effect its existence and rights (charter and statutory); provided, however, that
the Company shall not be required to preserve any such right if the Company
shall determine that the preservation thereof is no longer desirable in the
conduct of the business of the Company and that the loss thereof is not
disadvantageous in any material respect to the Noteholders.

     Section 5.6.  Maintenance of Properties. The Company will cause all
                   -------------------------
properties used or useful in the conduct of its business or the business of any
Significant Subsidiary to be maintained and kept in good condition, repair and
working order and supplied with all necessary equipment and will cause to be
made all necessary repairs, renewals, replacements, betterments and improvements
thereof, all as in the judgment of the Company may be necessary so that the
business carried on in connection therewith may be properly and advantageously
conducted at all times; provided, however, that nothing in this Section shall
prevent the Company from discontinuing the operation or maintenance of any of
such properties if such discontinuance is, in the judgment of the Company,
desirable in the conduct of its business or the business of any subsidiary and
not disadvantageous in any material respect to the Noteholders.

     Section 5.7.  Payment of Taxes and Other Claims. The Company will pay or
                   ---------------------------------
discharge, or cause to be paid or discharged, before the same may become
delinquent, (i) all taxes, assessments and governmental charges levied or
imposed upon the Company or any Significant Subsidiary or upon the income,
profits or property of the Company or any Significant Subsidiary, (ii) all
claims for labor, materials and supplies which, if unpaid, might by law become a
lien or charge upon the property of the Company or any Significant Subsidiary
and (iii) all stamps and other duties, if any, which may be imposed by the
United States or any political subdivision thereof or therein in connection with
the issuance, transfer, exchange or conversion of any Notes or with respect to
this Indenture; provided, however, that, in the case of clauses (i) and (ii),
the Company shall not be required to pay or discharge or cause to be paid or
discharged any such tax, assessment, charge or claim (A) if the failure to do so
will not, in the aggregate, have a material adverse impact on the Company, or
(B) if the amount, applicability or validity is being contested in good faith by
appropriate proceedings.

     Section 5.8.  Rule 144A Information Requirement. Within the period prior to
                   ---------------------------------
the expiration of the holding period applicable to sales thereof under Rule
144(k) under the Securities Act (or any successor provision), the Company
covenants and agrees that it shall, during any period in which it is not subject
to Section 13 or 15(d) under the Exchange Act, make available to any holder or
beneficial holder of Notes or any Common Stock issued upon conversion thereof
which continue to be Restricted Securities in connection with any sale thereof
and any prospective purchaser of Notes or such Common Stock designated by such
holder or beneficial holder, the information required pursuant to Rule
144A(d)(4) under the Securities Act upon the request of any holder or beneficial
holder of the Notes or such Common Stock and it will take such further action as
any holder or beneficial holder of such Notes or such Common Stock may
reasonably

                                      -31-
<PAGE>

request, all to the extent required from time to time to enable such holder or
beneficial holder to sell its Notes or Common Stock without registration under
the Securities Act within the limitation of the exemption provided by Rule 144A,
as such Rule may be amended from time to time. Upon the request of any holder or
any beneficial holder of the Notes or such Common Stock, the Company will
deliver to such holder a written statement as to whether it has complied with
such requirements.

     Section 5.9.  Stay, Extension and Usury Laws. The Company covenants (to the
                   ------------------------------
extent that it may lawfully do so) that it shall not at any time insist upon,
plead, or in any manner whatsoever claim or take the benefit or advantage of,
any stay, extension or usury law or other law which would prohibit or forgive
the Company from paying all or any portion of the principal of, premium, if any,
or interest (including Liquidated Damages, if any) on the Notes as contemplated
herein, wherever enacted, now or at any time hereafter in force, or which may
affect the covenants or the performance of this Indenture and the Company (to
the extent it may lawfully do so) hereby expressly waives all benefit or
advantage of any such law, and covenants that it will not, by resort to any such
law, hinder, delay or impede the execution of any power herein granted to the
Trustee, but will suffer and permit the execution of every such power as though
no such law had been enacted.

     Section 5.10.  Compliance Certificate. The Company shall deliver to the
                    ----------------------
Trustee, within one hundred twenty (120) days after the end of each fiscal year
of the Company, a certificate signed by either the principal executive officer,
principal financial officer or principal accounting officer of the Company,
stating whether or not to the best knowledge of the signer thereof the Company
is in default in the performance and observance of any of the terms, provisions
and conditions of this Indenture (without regard to any period of grace or
requirement of notice provided hereunder) and, if the Company shall be in
default, specifying all such defaults and the nature and the status thereof of
which the signer may have knowledge.

     The Company will deliver to the Trustee, forthwith upon becoming aware of
(i) any default in the performance or observance of any covenant, agreement or
condition contained in this Indenture, or (ii) any Event of Default, an
Officers' Certificate specifying with particularity such default or Event of
Default and further stating what action the Company has taken, is taking or
proposes to take with respect thereto.

     Any notice required to be given under this Section 5.10 or Section 4.5
shall be delivered to a Responsible Officer of the Trustee at its Corporate
Trust Office.  In the event that the payment of the Notes is accelerated because
of an Event of Default, the Company shall promptly provide written notice to the
Trustee specifying the names and addresses of the holders of Senior Indebtedness
if the Trustee (and not the Company) is to provide holders of Senior
Indebtedness notice of such acceleration under Section 4.5 of the Indenture.

     Section 5.11.  Liquidated Damages Notice. In the event that the Company is
                    -------------------------
required to pay Liquidated Damages to holders of Notes pursuant to the
Registration Rights Agreement, the Company will provide written notice
("Liquidated Damages Notice") to the Trustee of its obligation to pay Liquidated
Damages no later than fifteen days prior to the proposed payment date for the
Liquidated Damages, and the Liquidated Damages Notice shall set forth the amount
of Liquidated Damages to be paid by the Company on such payment date. The
Trustee shall not at any time be under any duty to responsibility to any holder
of Notes to determine the Liquidated Damages, or with respect to the nature,
extent or calculation of the amount of Liquidated Damages when made, or with
respect to the method employed in such calculation of the Liquidated Damages.

                                      -32-
<PAGE>

                                  ARTICLE SIX


                         NOTEHOLDERS' LISTS AND REPORTS
                         BY THE COMPANY AND THE TRUSTEE

     Section 6.1.  Noteholders' Lists. The Company covenants and agrees that it
                   ------------------
will furnish or cause to be furnished to the Trustee, semiannually, not more
than fifteen (15) days after each June 1 and December 1 in each year beginning
with June 1, 2000, and at such other times as the Trustee may request in
writing, within thirty (30) days after receipt by the Company of any such
request (or such lesser time as the Trustee may reasonably request in order to
enable it to timely provide any notice to be provided by it hereunder), a list
in such form as the Trustee may reasonably require of the names and addresses of
the holders of Notes as of a date not more than fifteen (15) days (or such other
date as the Trustee may reasonably request in order to so provide any such
notices) prior to the time such information is furnished, except that no such
list need be furnished by the Company to the Trustee so long as the Trustee is
acting as the sole Note registrar.

     Section 6.2.  Preservation and Disclosure of Lists.
                   ------------------------------------

             (a)   The Trustee shall preserve, in as current a form as is
reasonably practicable, all information as to the names and addresses of the
holders of Notes contained in the most recent list furnished to it as provided
in Section 6.1 or maintained by the Trustee in its capacity as Note registrar or
co-registrar in respect of the Notes, if so acting. The Trustee may destroy any
list furnished to it as provided in Section 6.1 upon receipt of a new list so
furnished.

             (b)   The rights of Noteholders to communicate with other holders
of Notes with respect to their rights under this Indenture or under the Notes,
and the corresponding rights and duties of the Trustee, shall be as provided by
the Trust Indenture Act.

             (c)   Every Noteholder, by receiving and holding the same, agrees
with the Company and the Trustee that neither the Company nor the Trustee nor
any agent of either of them shall be held accountable by reason of any
disclosure of information as to names and addresses of holders of Notes made
pursuant to the Trust Indenture Act.

     Section 6.3.  Reports by Trustee.
                   ------------------

             (a)   Within sixty (60) days after May 15 of each year commencing
with the year 2000, the Trustee shall transmit to holders of Notes such reports
dated as of May 15 of the year in which such reports are made concerning the
Trustee and its actions under this Indenture as may be required pursuant to the
Trust Indenture Act at the times and in the manner provided pursuant thereto.

             (b)   A copy of such report shall, at the time of such transmission
to holders of Notes, be filed by the Trustee with each stock exchange and
automated quotation system upon which the Notes are listed and with the Company.
The Company will promptly notify the Trustee in writing when the Notes are
listed on any stock exchange or automated quotation system or delisted
therefrom.

     Section 6.4.  Reports by Company. The Company shall file with the Trustee
                   ------------------
(and the Commission if at any time after the Indenture becomes qualified under
the Trust Indenture Act), and transmit to holders of Notes, such information,
documents and other reports and such summaries thereof, as may be required

                                      -33-
<PAGE>

pursuant to the Trust Indenture Act at the times and in the manner provided
pursuant to such Act, whether or not the Notes are governed by such Act;
provided, however, that any such information, documents or reports required to
--------  -------
be filed with the Commission pursuant to Section 13 or 15(d) of the Exchange Act
shall be filed with the Trustee within fifteen (15) days after the same is so
required to be filed with the Commission. Delivery of such reports, information
and documents to the Trustee is for informational purposes only and the
Trustee's receipt of such shall not constitute constructive notice of any
information contained therein or determinable from information contained
therein, including the Company's compliance with any of its covenants hereunder
(as to which the Trustee is entitled to rely exclusively on Officers'
Certificates).


                                 ARTICLE SEVEN

                          REMEDIES OF THE TRUSTEE AND
                      NOTEHOLDERS ON AN EVENT OF DEFAULT

     Section 7.1.  Events of Default. In case one or more of the following
                   -----------------
Events of Default (whatever the reason for such Event of Default and whether it
shall be voluntary or involuntary or be effected by operation of law or pursuant
to any judgment, decree or order of any court or any order, rule or regulation
of any administrative or governmental body) shall have occurred and be
continuing:

             (a)   default in the payment of any installment of interest
(including Liquidated Damages, if any) upon any of the Notes as and when the
same shall become due and payable, and continuance of such default for a period
of thirty (30) days, whether or not such payment is permitted under Article Four
hereof; or

             (b)   default in the payment of the principal of or premium, if
any, on any of the Notes as and when the same shall become due and payable
either at maturity or in connection with any redemption pursuant to Article
Three, by acceleration or otherwise, whether or not such payment is permitted
under Article Four hereof; or

             (c)   failure on the part of the Company duly to observe or perform
any other of the covenants or agreements on the part of the Company in the Notes
or in this Indenture (other than a covenant or agreement a default in whose
performance or whose breach is elsewhere in this Section 7.1 specifically dealt
with) continued for a period of sixty (60) days after the date on which written
notice of such failure, requiring the Company to remedy the same, shall have
been given to the Company by the Trustee, or the Company and a Responsible
Officer of the Trustee by the holders of at least twenty-five percent (25%) in
aggregate principal amount of the Notes at the time outstanding determined in
accordance with Section 9.4; or

             (d)   default under any bond, debenture, note or other evidence of
indebtedness for money borrowed of the Company having an aggregate outstanding
principal amount of in excess of $10,000,000, which default shall have resulted
in such indebtedness being accelerated, without such indebtedness being
discharged or such acceleration having been rescinded or annulled within 20 days
after receipt of notice thereof by the Company from the Trustee or the Company
and a Responsible Officer of the Trustee from the holders of not less than 25%
in aggregate principal amount of the Notes at the time outstanding (unless such
default has been cured or waived) specifying such default and requiring the
Company to cause such indebtedness to be discharged or such acceleration to be
rescinded or annulled.

             (e)   the Company shall commence a voluntary case or other
proceeding seeking liquidation, reorganization or other relief with respect to
the Company or its debts under any bankruptcy, insolvency or other similar law
now or hereafter in effect or seeking the appointment of a trustee, receiver,

                                      -34-
<PAGE>

liquidator, custodian or other similar official of the Company or any
substantial part of the property of the Company, or shall consent to any such
relief or to the appointment of or taking possession by any such official in an
involuntary case or other proceeding commenced against the Company, or shall
make a general assignment for the benefit of creditors, or shall fail generally
to pay its debts as they become due; or

             (f)   an involuntary case or other proceeding shall be commenced
against the Company seeking liquidation, reorganization or other relief with
respect to the Company or its debts under any bankruptcy, insolvency or other
similar law now or hereafter in effect or seeking the appointment of a trustee,
receiver, liquidator, custodian or other similar official of the Company or any
substantial part of the property of the Company, and such involuntary case or
other proceeding shall remain undismissed and unstayed for a period of ninety
(90) consecutive days;

then, and in each and every such case (other than an Event of Default specified
in Section 7.1(e) or (f)), unless the principal of all of the Notes shall have
already become due and payable, either the Trustee or the holders of not less
than twenty-five percent (25%) in aggregate principal amount of the Notes then
outstanding hereunder determined in accordance with Section 9.4, by notice in
writing to the Company (and to the Trustee if given by Noteholders), may declare
the principal of and premium, if any, on all the Notes and the interest accrued
thereon (including Liquidated Damages, if any) to be due and payable
immediately, and upon any such declaration the same shall become and shall be
immediately due and payable, anything in this Indenture or in the Notes
contained to the contrary notwithstanding.  If an Event of Default specified in
Section 7.1(e) or (f) occurs, the principal of all the Notes and the interest
accrued thereon shall (including Liquidated Damages, if any) be immediately and
automatically due and payable without necessity of further action.  This
provision, however, is subject to the conditions that if, at any time after the
principal of the Notes shall have been so declared due and payable, and before
any judgment or decree for the payment of the monies due shall have been
obtained or entered as hereinafter provided, the Company shall pay or shall
deposit with the Trustee a sum sufficient to pay all matured installments of
interest upon (including Liquidated Damages, if any) all Notes and the principal
of and premium, if any, on any and all Notes which shall have become due
otherwise than by acceleration (with interest on overdue installments of
interest (including Liquidated Damages, if any) (to the extent that payment of
such interest is enforceable under applicable law) and on such principal and
premium, if any, at the rate borne by the Notes, to the date of such payment or
deposit) and amounts due to the Trustee pursuant to Section 8.6, and if any and
all defaults under this Indenture, other than the nonpayment of principal of and
premium, if any, and accrued interest on (including Liquidated Damages, if any)
Notes which shall have become due by acceleration, shall have been cured or
waived pursuant to Section 7.7, then and in every such case the holders of a
majority in aggregate principal amount of the Notes then outstanding, by written
notice to the Company and to the Trustee, may waive all defaults or Events of
Default and rescind and annul such declaration and its consequences; but no such
waiver or rescission and annulment shall extend to or shall affect any
subsequent default or Event of Default, or shall impair any right consequent
thereon.  The Company shall notify a Responsible Officer of the Trustee,
promptly upon becoming aware thereof, of any Event of Default.

     In case the Trustee shall have proceeded to enforce any right under this
Indenture and such proceedings shall have been discontinued or abandoned because
of such waiver or rescission and annulment or for any other reason or shall have
been determined adversely to the Trustee, then and in every such case the
Company, the holders of Notes, and the Trustee shall be restored respectively to
their several positions and rights hereunder, and all rights, remedies and
powers of the Company, the holders of Notes, and the Trustee shall continue as
though no such proceeding had been taken.

                                      -35-
<PAGE>

     Section 7.2. Payments of Notes on Default; Suit Therefor. The Company
                  -------------------------------------------
covenants that (a) in case default shall be made in the payment of any
installment of interest upon (including Liquidated Damages, if any) any of the
Notes as and when the same shall become due and payable, and such default shall
have continued for a period of thirty (30) days, or (b) in case default shall be
made in the payment of the principal of or premium, if any, on any of the Notes
as and when the same shall have become due and payable, whether at maturity of
the Notes or in connection with any redemption, by or under this Indenture
declaration or otherwise, then, upon demand of the Trustee, the Company will pay
to the Trustee, for the benefit of the holders of the Notes, the whole amount
that then shall have become due and payable on all such Notes for principal and
premium, if any, or interest (including Liquidated Damages, if any), as the case
may be, with interest upon the overdue principal and premium, if any, and (to
the extent that payment of such interest is enforceable under applicable law)
upon the overdue installments of interest (including Liquidated Damages, if any)
at the rate borne by the Notes, and, in addition thereto, such further amount as
shall be sufficient to cover the costs and expenses of collection, including
reasonable compensation to the Trustee, its agents, attorneys and counsel, and
all other amounts due the Trustee under Section 8.6. Until such demand by the
Trustee, the Company may pay the principal of and premium, if any, and interest
on (including Liquidated Damages, if any) the Notes to the registered holders,
whether or not the Notes are overdue.

     In case the Company shall fail forthwith to pay such amounts upon such
demand, the Trustee, in its own name and as trustee of an express trust, shall
be entitled and empowered to institute any actions or proceedings at law or in
equity for the collection of the sums so due and unpaid, and may prosecute any
such action or proceeding to judgment or final decree, and may enforce any such
judgment or final decree against the Company or any other obligor on the Notes
and collect in the manner provided by law out of the property of the Company or
any other obligor on the Notes wherever situated the monies adjudged or decreed
to be payable.

     In case there shall be pending proceedings for the bankruptcy or for the
reorganization of the Company or any other obligor on the Notes under Title 11
of the United States Code, or any other applicable law, or in case a receiver,
assignee or trustee in bankruptcy or reorganization, liquidator, sequestrator or
similar official shall have been appointed for or taken possession of the
Company or such other obligor, the property of the Company or such other
obligor, or in the case of any other judicial proceedings relative to the
Company or such other obligor upon the Notes, or to the creditors or property of
the Company or such other obligor, the Trustee, irrespective of whether the
principal of the Notes shall then be due and payable as therein expressed or by
declaration or otherwise and irrespective of whether the Trustee shall have made
any demand pursuant to the provisions of this Section 7.2, shall be entitled and
empowered, by intervention in such proceedings or otherwise, to file and prove a
claim or claims for the whole amount of principal, premium, if any, and interest
(including Liquidated Damages, if any) owing and unpaid in respect of the Notes,
and, in case of any judicial proceedings, to file such proofs of claim and other
papers or documents as may be necessary or advisable in order to have the claims
of the Trustee and of the Noteholders allowed in such judicial proceedings
relative to the Company or any other obligor on the Notes, its or their
creditors, or its or their property, and to collect and receive any monies or
other property payable or deliverable on any such claims, and to distribute the
same after the deduction of any amounts due the Trustee under Section 8.6, and
any receiver, assignee or trustee in bankruptcy or reorganization, liquidator,
custodian or similar official is hereby authorized by each of the Noteholders to
make such payments to the Trustee, and, in the event that the Trustee shall
consent to the making of such payments directly to the Noteholders, to pay to
the Trustee any amount due it for reasonable compensation, expenses, advances
and disbursements, including counsel fees incurred by it up to the date of such
distribution.  To the extent that such payment of reasonable compensation,
expenses, advances and disbursements out of the estate in any such proceedings
shall be denied for any reason, payment of the same shall be secured by a lien
on, and shall be paid out of, any and all

                                      -36-
<PAGE>

distributions, dividends, monies, securities and other property which the
holders of the Notes may be entitled to receive in such proceedings, whether in
liquidation or under any plan of reorganization or arrangement or otherwise.

     All rights of action and of asserting claims under this Indenture, or under
any of the Notes, may be enforced by the Trustee without the possession of any
of the Notes, or the production thereof at any trial or other proceeding
relative thereto, and any such suit or proceeding instituted by the Trustee
shall be brought in its own name as trustee of an express trust, and any
recovery of judgment shall, after provision for the payment of the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agent and
counsel, be for the ratable benefit of the holders of the Notes.

     In any proceedings brought by the Trustee (and in any proceedings involving
the interpretation of any provision of this Indenture to which the Trustee shall
be a party) the Trustee shall be held to represent all the holders of the Notes,
and it shall not be necessary to make any holders of the Notes parties to any
such proceedings.

     Section 7.3. Application of Monies Collected by Trustee. Any monies
                  ------------------------------------------
collected by the Trustee pursuant to this Article Seven shall be applied in the
order following, at the date or dates fixed by the Trustee for the distribution
of such monies, upon presentation of the several Notes, and stamping thereon the
payment, if only partially paid, and upon surrender thereof, if fully paid:

          FIRST: To the payment of all amounts due the Trustee under Section
8.6;

          SECOND: Subject to the provisions of Article Four, in case the
     principal of the outstanding Notes shall not have become due and be unpaid,
     to the payment of interest on (including Liquidated Damages, if any) the
     Notes in default in the order of the maturity of the installments of such
     interest, with interest (to the extent that such interest has been
     collected by the Trustee) upon the overdue installments of interest
     (including Liquidated Damages, if any) at the rate borne by the Notes, such
     payments to be made ratably to the Persons entitled thereto;

          THIRD: Subject to the provisions of Article Four, in case the
     principal of the outstanding Notes shall have become due, by declaration or
     otherwise, and be unpaid to the payment of the whole amount then owing and
     unpaid upon the Notes for principal and premium, if any, and interest
     (including Liquidated Damages, if any), with interest on the overdue
     principal and premium, if any, and (to the extent that such interest has
     been collected by the Trustee) upon overdue installments of interest
     (including Liquidated Damages, if any) at the rate borne by the Notes, and
     in case such monies shall be insufficient to pay in full the whole amounts
     so due and unpaid upon the Notes, then to the payment of such principal and
     premium, if any, and interest (including Liquidated Damages, if any)
     without preference or priority of principal and premium, if any, over
     interest (including Liquidated Damages, if any), or of interest (including
     Liquidated Damages, if any) over principal and premium, if any, or of any
     installment of interest over any other installment of interest, or of any
     Note over any other Note, ratably to the aggregate of such principal and
     premium, if any, and accrued and unpaid interest; and

          FOURTH: Subject to the provisions of Article Four, to the payment of
     the remainder, if any, to the Company or any other Person lawfully entitled
     thereto.

                                      -37-
<PAGE>

     Section 7.4. Proceedings by Noteholder. No holder of any Note shall have
                  -------------------------
any right by virtue of or by reference to any provision of this Indenture to
institute any suit, action or proceeding in equity or at law upon or under or
with respect to this Indenture, or for the appointment of a receiver, trustee,
liquidator, custodian or other similar official, or for any other remedy
hereunder, unless such holder previously shall have given to the Trustee written
notice of an Event of Default and of the continuance thereof, as hereinbefore
provided, and unless also the holders of not less than twenty-five percent (25%)
in aggregate principal amount of the Notes then outstanding shall have made
written request upon the Trustee to institute such action, suit or proceeding in
its own name as Trustee hereunder and shall have offered to the Trustee such
reasonable indemnity as it may require against the costs, expenses and
liabilities to be incurred therein or thereby, and the Trustee for sixty (60)
days after its receipt of such notice, request and offer of indemnity, shall
have neglected or refused to institute any such action, suit or proceeding and
no direction inconsistent with such written request shall have been given to the
Trustee pursuant to Section 7.7; it being understood and intended, and being
expressly covenanted by the taker and holder of every Note with every other
taker and holder and the Trustee, that no one or more holders of Notes shall
have any right in any manner whatever by virtue of or by reference to any
provision of this Indenture to affect, disturb or prejudice the rights of any
other holder of Notes, or to obtain or seek to obtain priority over or
preference to any other such holder, or to enforce any right under this
Indenture, except in the manner herein provided and for the equal, ratable and
common benefit of all holders of Notes (except as otherwise provided herein).
For the protection and enforcement of this Section 7.4, each and every
Noteholder and the Trustee shall be entitled to such relief as can be given
either at law or in equity.

     Notwithstanding any other provision of this Indenture and any provision of
any Note, the right of any holder of any Note to receive payment of the
principal of and premium, if any (including the redemption price upon redemption
pursuant to Article Three), and accrued interest on (including Liquidated
Damages, if any) such Note, on or after the respective due dates expressed in
such Note or in the event of redemption, or to institute suit for the
enforcement of any such payment on or after such respective dates against the
Company shall not be impaired or affected without the consent of such holder.

     Anything in this Indenture or the Notes to the contrary notwithstanding,
the holder of any Note, without the consent of either the Trustee or the holder
of any other Note, in its own behalf and for its own benefit, may enforce, and
may institute and maintain any proceeding suitable to enforce, its rights of
conversion as provided herein.

     Section 7.5. Proceedings by Trustee. In case of an Event of Default known
                  ----------------------
to a Responsible Officer of the Trustee, the Trustee may, in its discretion,
proceed to protect and enforce the rights vested in it by this Indenture by such
appropriate judicial proceedings as are necessary to protect and enforce any of
such rights, either by suit in equity or by action at law or by proceeding in
bankruptcy or otherwise, whether for the specific enforcement of any covenant or
agreement contained in this Indenture or in aid of the exercise of any power
granted in this Indenture, or to enforce any other legal or equitable right
vested in the Trustee by this Indenture or by law.

     Section 7.6. Remedies Cumulative and Continuing. Except as provided in
                  ----------------------------------
Section 2.6, all powers and remedies given by this Article Seven to the Trustee
or to the Noteholders shall, to the extent permitted by law, be deemed
cumulative and not exclusive of any thereof or of any other powers and remedies
available to the Trustee or the holders of the Notes, by judicial proceedings or
otherwise, to enforce the performance or observance of the covenants and
agreements contained in this Indenture, and no delay or omission of the Trustee
or of any holder of any of the Notes to exercise any right or power accruing
upon any default or Event of Default occurring and continuing as aforesaid shall
impair any such right or power, or shall be construed to

                                      -38-
<PAGE>

be a waiver of any such default or any acquiescence therein, and, subject to the
provisions of Section 7.4, every power and remedy given by this Article Seven or
by law to the Trustee or to the Noteholders may be exercised from time to time,
and as often as shall be deemed expedient, by the Trustee or by the Noteholders.

     Section 7.7. Direction of Proceedings and Waiver of Defaults by Majority of
Noteholders.      --------------------------------------------------------------
-----------

The holders of a majority in aggregate principal amount of the
Notes at the time outstanding determined in accordance with Section 9.4 shall
have the right to direct the time, method and place of conducting any proceeding
for any remedy available to the Trustee or exercising any trust or power
conferred on the Trustee; provided, however, that (a) such direction shall not
be in conflict with any rule of law or with this Indenture, (b) the Trustee may
take any other action which is not inconsistent with such direction and (c) the
Trustee may decline to take any action that would benefit some Noteholder to the
detriment of other Noteholders. The holders of a majority in aggregate principal
amount of the Notes at the time outstanding determined in accordance with
Section 9.4 may, on behalf of the holders of all of the Notes, waive any past
default or Event of Default hereunder and its consequences except (i) a default
in the payment of interest (including Liquidated Damages, if any) or premium, if
any, on, or the principal of, the Notes, (ii) a failure by the Company to
convert any Notes into Common Stock, (iii) a default in the payment of
redemption price pursuant to Article Three or (iv) a default in respect of a
covenant or provisions hereof which under Article Eleven cannot be modified or
amended without the consent of the holders of each or all Notes then outstanding
or affected thereby. Upon any such waiver, the Company, the Trustee and the
holders of the Notes shall be restored to their former positions and rights
hereunder; but no such waiver shall extend to any subsequent or other default or
Event of Default or impair any right consequent thereon. Whenever any default or
Event of Default hereunder shall have been waived as permitted by this Section
7.7, said default or Event of Default shall for all purposes of the Notes and
this Indenture be deemed to have been cured and to be not continuing; but no
such waiver shall extend to any subsequent or other default or Event of Default
or impair any right consequent thereon.

     Section 7.8. Notice of Defaults. The Trustee shall, within ninety (90) days
                  ------------------
after a Responsible Officer of the Trustee has knowledge of the occurrence of a
default, mail to all Noteholders, as the names and addresses of such holders
appear upon the Note register, notice of all defaults known to a Responsible
Officer, unless such defaults shall have been cured or waived before the giving
of such notice; provided, however, that except in the case of default in the
payment of the principal of, or premium, if any, or interest (including
Liquidated Damages, if any) on any of the Notes, the Trustee shall be protected
in withholding such notice if and so long as a trust committee of directors
and/or Responsible Officers of the Trustee in good faith determines that the
withholding of such notice is in the interests of the Noteholders.

     Section 7.9. Undertaking to Pay Costs. All parties to this Indenture agree,
                  ------------------------
and each holder of any Note by his acceptance thereof shall be deemed to have
agreed, that any court may, in its discretion, require, in any suit for the
enforcement of any right or remedy under this Indenture, or in any suit against
the Trustee for any action taken or omitted by it as Trustee, the filing by any
party litigant in such suit of an undertaking to pay the costs of such suit and
that such court may in its discretion assess reasonable costs, including
reasonable attorneys' fees and expenses, against any party litigant in such
suit, having due regard to the merits and good faith of the claims or defenses
made by such party litigant; provided, however, that the provisions of this
Section 7.9 (to the extent permitted by law) shall not apply to any suit
instituted by the Trustee, to any suit instituted by any Noteholder, or group of
Noteholders, holding in the aggregate more than ten percent in principal amount
of the Notes at the time outstanding determined in accordance with Section 9.4,
or to any suit instituted by any Noteholder for the enforcement of the payment
of the principal of or premium, if any, or interest on any Note on or after the
due date expressed in such Note or to any suit for the enforcement of the right
to convert any Note in accordance with the provisions of Article Fifteen.

                                      -39-
<PAGE>

                                 ARTICLE EIGHT


                                  THE TRUSTEE

     Section 8.1. Duties and Responsibilities of Trustee. The Trustee, prior to
                  --------------------------------------
the occurrence of an Event of Default and after the curing of all Events of
Default which may have occurred, undertakes to perform such duties and only such
duties as are specifically set forth in this Indenture. In case an Event of
Default has occurred (which has not been cured or waived), the Trustee shall
exercise such of the rights and powers vested in it by this Indenture, and use
the same degree of care and skill in their exercise, as a prudent person would
exercise or use under the circumstances in the conduct of his own affairs.

     No provision of this Indenture shall be construed to relieve the Trustee
from liability for its own negligent action, its own negligent failure to act or
its own willful misconduct, except that:
            (a) prior to the occurrence of an Event of Default and after the
curing or waiving of all Events of Default which may have occurred:

               (1) the duties and obligations of the Trustee shall be determined
            solely by the express provisions of this Indenture and the Trust
            Indenture Act, and the Trustee shall not be liable except for the
            performance of such duties and obligations as are specifically set
            forth in this Indenture and no implied covenants or obligations
            shall be read into this Indenture and the Trust Indenture Act
            against the Trustee; and

               (2) in the absence of bad faith and willful misconduct on the
            part of the Trustee, the Trustee may conclusively rely as to the
            truth of the statements and the correctness of the opinions
            expressed therein, upon any certificates or opinions furnished to
            the Trustee and conforming to the requirements of this Indenture;
            but, in the case of any such certificates or opinions which by any
            provisions hereof are specifically required to be furnished to the
            Trustee, the Trustee shall be under a duty to examine the same to
            determine whether or not they conform to the requirements of this
            Indenture;

            (b) the Trustee shall not be liable for any error of judgment made
in good faith by a Responsible Officer or Officers of the Trustee, unless the
Trustee was negligent in ascertaining the pertinent facts;

            (c) the Trustee shall not be liable with respect to any action taken
or omitted to be taken by it in good faith in accordance with the written
direction of the holders of not less than a majority in principal amount of the
Notes at the time outstanding determined as provided in Section 9.4 relating to
the time, method and place of conducting any proceeding for any remedy available
to the Trustee, or exercising any trust or power conferred upon the Trustee,
under this Indenture;

            (d) whether or not therein provided, every provision of this
Indenture relating to the conduct or affecting the liability of, or affording
protection to, the Trustee shall be subject to the provisions of this Section;

            (e) the Trustee shall not be liable in respect of any payment (as to
the correctness of amount, entitlement to receive or any other matters relating
to payment) or notice effected by the Company or any paying agent or any records
maintained by any co-registrar with respect to the Notes; and

                                      -40-
<PAGE>

           (f) if any party fails to deliver a notice relating to an event the
fact of which, pursuant to this Indenture, requires notice to be sent to the
Trustee, the Trustee may conclusively rely on its failure to receive such notice
as reason to act as if no such event occurred.

     None of the provisions contained in this Indenture shall require the
Trustee to expend or risk its own funds or otherwise incur personal financial
liability in the performance of any of its duties or in the exercise of any of
its rights or powers, if there is reasonable ground for believing that the
repayment of such funds or adequate indemnity against such risk or liability is
not reasonably assured to it.

     Section 8.2. Reliance on Documents, Opinions, Etc. Except as otherwise
                  ------------------------------------
provided in Section 8.1:

             (a) the Trustee may rely and shall be protected in acting upon any
resolution, certificate, statement, instrument, opinion, report, notice,
request, consent, order, bond, debenture, note, coupon or other paper or
document (whether in its original or facsimile form) believed by it in good
faith to be genuine and to have been signed or presented by the proper party or
parties;

              (b) any request, direction, order or demand of the Company
mentioned herein shall be sufficiently evidenced by an Officers' Certificate
(unless other evidence in respect thereof be herein specifically prescribed);
and any resolution of the Board of Directors may be evidenced to the Trustee by
a copy thereof certified by the Secretary or an Assistant Secretary of the
Company;

              (c) the Trustee may consult with counsel of its own selection and
any advice or Opinion of Counsel shall be full and complete authorization and
protection in respect of any action taken or omitted by it hereunder in good
faith and in accordance with such advice or Opinion of Counsel;

              (d) the Trustee shall be under no obligation to exercise any of
the rights or powers vested in it by this Indenture at the request, order or
direction of any of the Noteholders pursuant to the provisions of this
Indenture, unless such Noteholders shall have offered to the Trustee reasonable
security or indemnity against the costs, expenses and liabilities which may be
incurred therein or thereby;

              (e) the Trustee shall not be bound to make any investigation into
the facts or matters stated in any resolution, certificate, statement,
instrument, opinion, report, notice, request, direction, consent, order, bond,
debenture or other paper or document, but the Trustee, in its discretion, may
make such further inquiry or investigation into such facts or matters as it may
see fit, and, if the Trustee shall determine to make such further inquiry or
investigation, it shall be entitled to examine the books, records and premises
of the Company, personally or by agent or attorney; and

              (f) the Trustee may execute any of the trusts or powers hereunder
or perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed by it with due care
hereunder.

     Section 8.3. No Responsibility for Recitals, Etc. The recitals contained
                  -----------------------------------
herein and in the Notes (except in the Trustee's certificate of authentication)
shall be taken as the statements of the Company, and the Trustee assumes no
responsibility for the correctness of the same. The Trustee makes no
representations as to the validity or sufficiency of this Indenture or of the
Notes. The Trustee shall not be accountable for the use or application by the
Company of any Notes or the proceeds of any Notes authenticated and delivered by
the Trustee in conformity with the provisions of this Indenture.

                                      -41-
<PAGE>

     Section 8.4. Trustee, Paying Agents, Conversion Agents or Registrar May Own
                  --------------------------------------------------------------
Notes. The Trustee, any paying agent, any conversion agent or Note registrar, in
-----
its individual or any other capacity, may become the owner or pledgee of Notes
with the same rights it would have if it were not Trustee, paying agent,
conversion agent or Note registrar.

     Section 8.5. Monies to be Held in Trust. Subject to the provisions of
                  --------------------------
Section 13.4 and Section 4.2, all monies received by the Trustee shall, until
used or applied as herein provided, be held in trust for the purposes for which
they were received. Money held by the Trustee in trust hereunder need not be
segregated from other funds except to the extent required by law. The Trustee
shall be under no liability for interest on any money received by it hereunder
except as may be agreed in writing from time to time by the Company and the
Trustee.

     Section 8.6. Compensation and Expenses of Trustee. The Company covenants
                  ------------------------------------
and agrees to pay to the Trustee from time to time, and the Trustee shall be
entitled to, reasonable compensation for all services rendered by it hereunder
in any capacity (which shall not be limited by any provision of law in regard to
the compensation of a trustee of an express trust) as mutually agreed to from
time to time in writing between the Company and the Trustee, and the Company
will pay or reimburse the Trustee upon its request for all reasonable expenses,
disbursements and advances reasonably incurred or made by the Trustee in
accordance with any of the provisions of this Indenture (including the
reasonable compensation and the expenses and disbursements of its counsel and of
all Persons not regularly in its employ) except any such expense, disbursement
or advance as may arise from its negligence, willful misconduct, recklessness or
bad faith. The Company also covenants to indemnify the Trustee (or any officer,
director or employee of the Trustee), in any capacity under this Indenture and
its agents and any authenticating agent for, and to hold them harmless against,
any and all loss, liability, claim or expense incurred without negligence,
willful misconduct, recklessness or bad faith on the part of the Trustee or such
officers, directors, employees and agent or authenticating agent, as the case
may be, and arising out of or in connection with the acceptance or
administration of this trust or in any other capacity hereunder, including the
costs and expenses of defending themselves against any claim of liability in the
premises. The obligations of the Company under this Section 8.6 to compensate or
indemnify the Trustee and to pay or reimburse the Trustee for expenses,
disbursements and advances shall be secured by a lien prior to that of the Notes
upon all property and funds held or collected by the Trustee as such, except
funds held in trust for the benefit of the holders of particular Notes. The
obligation of the Company under this Section shall survive the satisfaction and
discharge of this Indenture.

     When the Trustee and its agents and any authenticating agent incur expenses
or render services after an Event of Default specified in Section 7.1(e) or (f)
with respect to the Company occurs, the expenses and the compensation for the
services are intended to constitute expenses of administration under any
bankruptcy, insolvency or similar laws.

     Section 8.7. Officers' Certificate as Evidence. Except as otherwise
                  ---------------------------------
provided in Section 8.1, whenever in the administration of the provisions of
this Indenture the Trustee shall deem it necessary or desirable that a matter be
proved or established prior to taking or omitting any action hereunder, such
matter (unless other evidence in respect thereof be herein specifically
prescribed) may, in the absence of negligence or willful misconduct on the part
of the Trustee, be deemed to be conclusively proved and established by an
Officers' Certificate delivered to the Trustee.

     Section 8.8. Conflicting Interests of Trustee. If the Trustee has or shall
                  --------------------------------
acquire a conflicting interest within the meaning of the Trust Indenture Act,
the Trustee shall either eliminate such interest or

                                      -42-
<PAGE>

resign, to the extent and in the manner provided by, and subject to the
provisions of, the Trust Indenture Act and this Indenture.

     Section 8.9. Eligibility of Trustee. There shall at all times be a Trustee
                  ----------------------
hereunder which shall be a Person that is eligible pursuant to the Trust
Indenture Act to act as such and has a combined capital and surplus of at least
$50,000,000 (or if such Person is a member of a bank holding company system, its
bank holding company shall have a combined capital and surplus of at least
$50,000,000). If such Person publishes reports of condition at least annually,
pursuant to law or to the requirements of any supervising or examining
authority, then for the purposes of this Section the combined capital and
surplus of such Person shall be deemed to be its combined capital and surplus as
set forth in its most recent report of condition so published. If at any time
the Trustee shall cease to be eligible in accordance with the provisions of this
Section 8.9, it shall resign immediately in the manner and with the effect
hereinafter specified in this Article.

     Section 8.10.  Resignation or Removal of Trustee.
                    ---------------------------------

            (a) The Trustee may at any time resign by giving written notice of
such resignation to the Company and to the holders of Notes. Upon receiving such
notice of resignation, the Company shall promptly appoint a successor trustee by
written instrument, in duplicate, executed by order of the Board of Directors,
one copy of which instrument shall be delivered to the resigning Trustee and one
copy to the successor trustee. If no successor trustee shall have been so
appointed and have accepted appointment sixty (60) days after the mailing of
such notice of resignation to the Noteholders, the resigning Trustee may, upon
ten (10) business days' notice to the Company and the Noteholders, appoint a
successor identified in such notice or may petition, at the expense of the
Company, any court of competent jurisdiction for the appointment of a successor
trustee, or, if any Noteholder who has been a bona fide holder of a Note or
Notes for at least six (6) months may, subject to the provisions of Section 7.9,
on behalf of himself and all others similarly situated, petition any such court
for the appointment of a successor trustee. Such court may thereupon, after such
notice, if any, as it may deem proper and prescribe, appoint a successor
trustee.

           (b)  In case at any time any of the following shall occur:

                (1)  the Trustee shall fail to comply with Section 8.8 after
            written request therefor by the Company or by any Noteholder who has
            been a bona fide holder of a Note or Notes for at least six (6)
            months; or

                (2)  the Trustee shall cease to be eligible in accordance with
            the provisions of Section 8.9 and shall fail to resign after written
            request therefor by the Company or by any such Noteholder; or

                (3)  the Trustee shall become incapable of acting, or shall be
            adjudged a bankrupt or insolvent, or a receiver of the Trustee or of
            its property shall be appointed, or any public officer shall take
            charge or control of the Trustee or of its property or affairs for
            the purpose of rehabilitation, conservation or liquidation;

     then, in any such case, the Company may remove the Trustee and appoint a
successor trustee by written instrument, in duplicate, executed by order of the
Board of Directors, one copy of which instrument shall be delivered to the
Trustee so removed and one copy to the successor trustee, or, subject to the
provisions of Section 7.9, any Noteholder who has been a bona fide holder of a
Note or Notes for at least six (6) months may, on behalf of himself and all
others similarly situated, petition any court of competent

                                      -43-
<PAGE>

jurisdiction for the removal of the Trustee and the appointment of a successor
trustee; provided, however, that if no successor Trustee shall have been
appointed and have accepted appointment sixty (60) days after either the Company
or the Noteholders has removed the Trustee, the Trustee so removed may petition
any court of competent jurisdiction for an appointment of a successor trustee.
Such court may thereupon, after such notice, if any, as it may deem proper and
prescribe, remove the Trustee and appoint a successor trustee.

            (c)  The holders of a majority in aggregate principal amount of the
Notes at the time outstanding may at any time remove the Trustee and nominate a
successor trustee which shall be deemed appointed as successor trustee unless,
within ten (10) days after notice to the Company of such nomination, the Company
objects thereto, in which case the Trustee so removed or any Noteholder, or if
such Trustee so removed or any Noteholder fails to act, the Company, upon the
terms and conditions and otherwise as in Section 8.10(a) provided, may petition
any court of competent jurisdiction for an appointment of a successor trustee.

            (d)  Any resignation or removal of the Trustee and appointment of a
successor trustee pursuant to any of the provisions of this Section 8.10 shall
become effective upon acceptance of appointment by the successor trustee as
provided in Section 8.11.

     Section 8.11. Acceptance by Successor Trustee. Any successor trustee
                   -------------------------------
appointed as provided in Section 8.10 shall execute, acknowledge and deliver to
the Company and to its predecessor trustee an instrument accepting such
appointment hereunder, and thereupon the resignation or removal of the
predecessor trustee shall become effective and such successor trustee, without
any further act, deed or conveyance, shall become vested with all the rights,
powers, duties and obligations of its predecessor hereunder, with like effect as
if originally named as trustee herein; but, nevertheless, on the written request
of the Company or of the successor trustee, the trustee ceasing to act shall,
upon payment of any amount then due it pursuant to the provisions of Section
8.6, execute and deliver an instrument transferring to such successor trustee
all the rights and powers of the trustee so ceasing to act. Upon request of any
such successor trustee, the Company shall execute any and all instruments in
writing for more fully and certainly vesting in and confirming to such successor
trustee all such rights and powers. Any trustee ceasing to act shall,
nevertheless, retain a lien upon all property and funds held or collected by
such trustee as such, except for funds held in trust for the benefit of holders
of particular Notes, to secure any amounts then due it pursuant to the
provisions of Section 8.6.

     No successor trustee shall accept appointment as provided in this Section
8.11 unless, at the time of such acceptance, such successor trustee shall be
qualified under the provisions of Section 8.8 and be eligible under the
provisions of Section 8.9.

     Upon acceptance of appointment by a successor trustee as provided in this
Section 8.11, the Company (or the former trustee, at the written direction of
the Company) shall mail or cause to be mailed notice of the succession of such
trustee hereunder to the holders of Notes at their addresses as they shall
appear on the Note register.  If the Company fails to mail such notice within
ten (10) days after acceptance of appointment by the successor trustee, the
successor trustee shall cause such notice to be mailed at the expense of the
Company.

     Section 8.12. Succession by Merger, Etc. Any corporation into which the
Trustee may be merged or converted or with which it may be consolidated, or any
corporation resulting from any merger, conversion or consolidation to which the
Trustee shall be a party, or any corporation succeeding to all or substantially
all of the corporate trust business of the Trustee (including any trust created
by this Indenture), shall be the successor to the Trustee hereunder without the
execution or filing of any paper or any further act on the part

                                      -44-
<PAGE>

of any of the parties hereto, provided that in the case of any corporation
succeeding to all or substantially all of the corporate trust business of the
Trustee, such corporation shall be qualified under the provisions of Section 8.8
and eligible under the provisions of Section 8.9.

     In case at the time such successor to the Trustee shall succeed to the
trusts created by this Indenture, any of the Notes shall have been authenticated
but not delivered, any such successor to the Trustee may adopt the certificate
of authentication of any predecessor trustee or authenticating agent appointed
by such predecessor trustee, and deliver such Notes so authenticated; and in
case at that time any of the Notes shall not have been authenticated, any
successor to the Trustee or any authenticating agent appointed by such successor
trustee may authenticate such Notes in the name of the successor trustee; and in
all such cases such certificates shall have the full force that is provided in
the Notes or in this Indenture; provided, however, that the right to adopt the
certificate of authentication of any predecessor Trustee or authenticate Notes
in the name of any predecessor Trustee shall apply only to its successor or
successors by merger, conversion or consolidation.

     Section 8.13. Preferential Collection of Claims. If and when the Trustee
                   ---------------------------------
shall be or become a creditor of the Company (or any other obligor upon the
Notes), the Trustee shall be subject to the provisions of the Trust Indenture
Act regarding the collection of the claims against the Company (or any such
other obligor).

     Section 8.14. Trustee's Application for Instructions from the Company. Any
                   -------------------------------------------------------
application by the Trustee for written instructions from the Company (other than
with regard to any action proposed to be taken or omitted to be taken by the
Trustee that affects the rights of the holders of the Notes or holders of Senior
Indebtedness under this Indenture, including, without limitation, under Article
Four hereof) may, at the option of the Trustee, set forth in writing any action
proposed to be taken or omitted by the Trustee under this Indenture and the date
on and/or after which such action shall be taken or such omission shall be
effective. The Trustee shall not be liable for any action taken by, or omission
of, the Trustee in accordance with a proposal included in such application on or
after the date specified in such application (which date shall not be less than
three (3) Business Days after the date any officer of the Company actually
receives such application, unless any such officer shall have consented in
writing to any earlier date) unless prior to taking any such action (or the
effective date in the case of an omission), the Trustee shall have received
written instructions in response to such application specifying the action to be
taken or omitted.

                                 ARTICLE NINE

                                THE NOTEHOLDERS

     Section 9.1. Action by Noteholders. Whenever in this Indenture it is
                  ---------------------
provided that the holders of a specified percentage in aggregate principal
amount of the Notes may take any action (including the making of any demand or
request, the giving of any notice, consent or waiver or the taking of any other
action), the fact that at the time of taking any such action, the holders of
such specified percentage have joined therein may be evidenced (a) by any
instrument or any number of instruments of similar tenor executed by Noteholders
in person or by agent or proxy appointed in writing, or (b) by the record of the
holders of Notes voting in favor thereof at any meeting of Noteholders duly
called and held in accordance with the provisions of Article Ten, or (c) by a
combination of such instrument or instruments and any such record of such a
meeting of Noteholders. Whenever the Company or the Trustee solicits the taking
of any action by the holders of the Notes, the Company or the Trustee may fix in
advance of such solicitation, a date as the record

                                      -45-
<PAGE>

date for determining holders entitled to take such action. The record date shall
be not more than fifteen (15) days prior to the date of commencement of
solicitation of such action.

     Section 9.2. Proof of Execution by Noteholders. Subject to the provisions
                  ---------------------------------
of Sections 8.1, 8.2 and 10.5, proof of the execution of any instrument by a
Noteholder or its agent or proxy shall be sufficient if made in accordance with
such reasonable rules and regulations as may be prescribed by the Trustee or in
such manner as shall be satisfactory to the Trustee. The holding of Notes shall
be proved by the registry of such Notes or by a certificate of the Note
registrar.

     The record of any Noteholders' meeting shall be proved in the manner
provided in Section 10.6.

     Section 9.3. Who Are Deemed Absolute Owners. The Company, the Trustee, any
                  ------------------------------
paying agent, any conversion agent and any Note registrar may deem the Person in
whose name such Note shall be registered upon the Note register to be, and may
treat it as, the absolute owner of such Note (whether or not such Note shall be
overdue and notwithstanding any notation of ownership or other writing thereon
made by any Person other than the Company or any Note registrar) for the purpose
of receiving payment of or on account of the principal of, premium, if any, and
interest on such Note, for conversion of such Note and for all other purposes;
and neither the Company nor the Trustee nor any paying agent nor any conversion
agent nor any Note registrar shall be affected by any notice to the contrary.
All such payments so made to any holder for the time being, or upon his order,
shall be valid, and, to the extent of the sum or sums so paid, effectual to
satisfy and discharge the liability for monies payable upon any such Note.

     Section 9.4. Company-Owned Notes Disregarded. In determining whether the
                  -------------------------------
holders of the requisite aggregate principal amount of Notes have concurred in
any direction, consent, waiver or other action under this Indenture, Notes which
are owned by the Company or any other obligor on the Notes or any Affiliate of
the Company or any other obligor on the Notes shall be disregarded and deemed
not to be outstanding for the purpose of any such determination; provided,
however, that, for the purposes of determining whether the Trustee shall be
protected in relying on any such direction, consent, waiver or other action,
only Notes which a Responsible Officer knows are so owned shall be so
disregarded. Notes so owned which have been pledged in good faith may be
regarded as outstanding for the purposes of this Section 9.4 if the pledgee
shall establish to the satisfaction of the Trustee the pledgee's right to vote
such Notes and that the pledgee is not the Company, any other obligor on the
Notes or any Affiliate of the Company or any such other obligor. In the case of
a dispute as to such right, any decision by the Trustee taken upon the advice of
counsel shall be full protection to the Trustee. Upon request of the Trustee,
the Company shall furnish to the Trustee promptly an Officers' Certificate
listing and identifying all Notes, if any, known by the Company to be owned or
held by or for the account of any of the above described Persons, and, subject
to Section 8.1, the Trustee shall be entitled to accept such Officers'
Certificate as conclusive evidence of the facts therein set forth and of the
fact that all Notes not listed therein are outstanding for the purpose of any
such determination.

     Section 9.5. Revocation of Consents; Future Holders Bound. At any time
                  --------------------------------------------
prior to (but not after) the evidencing to the Trustee, as provided in Section
9.1, of the taking of any action by the holders of the percentage in aggregate
principal amount of the Notes specified in this Indenture in connection with
such action, any holder of a Note which is shown by the evidence to be included
in the Notes the holders of which have consented to such action may, by filing
written notice with the Trustee at its Corporate Trust Office and upon proof of
holding as provided in Section 9.2, revoke such action so far as concerns such
Note. Except as aforesaid, any such action taken by the holder of any Note shall
be conclusive and binding upon such holder and upon all future holders and
owners of such Note and of any Notes issued in exchange or substitution

                                      -46-
<PAGE>

therefor, irrespective of whether any notation in regard thereto is made upon
such Note or any Note issued in exchange or substitution therefor.

                                  ARTICLE TEN

                            MEETINGS OF NOTEHOLDERS

     Section 10.1. Purpose of Meetings. A meeting of Noteholders may be called
                   -------------------
at any time and from time to time pursuant to the provisions of this Article Ten
for any of the following purposes:

             (1)  to give any notice to the Company or to the Trustee or to give
     any directions to the Trustee permitted under this Indenture, or to consent
     to the waiving of any default or Event of Default hereunder and its
     consequences, or to take any other action authorized to be taken by
     Noteholders pursuant to any of the provisions of Article Seven;

             (2)  to remove the Trustee and nominate a successor trustee
     pursuant to the provisions of Article Eight;

             (3)  to consent to the execution of an indenture or indentures
     supplemental hereto pursuant to the provisions of Section 11.2; or

             (4) to take any other action authorized to be taken by or on behalf
     of the holders of any specified aggregate principal amount of the Notes
     under any other provision of this Indenture or under applicable law.

     Section 10.2. Call of Meetings by Trustee. The Trustee may at any time call
                   ---------------------------
a meeting of Noteholders to take any action specified in Section 10.1, to be
held at such time and at such place as the Trustee shall determine. Notice of
every meeting of the Noteholders, setting forth the time and the place of such
meeting and in general terms the action proposed to be taken at such meeting and
the establishment of any record date pursuant to Section 9.1, shall be mailed to
holders of Notes at their addresses as they shall appear on the Note register.
Such notice shall also be mailed to the Company. Such notices shall be mailed
not less than twenty (20) nor more than ninety (90) days prior to the date fixed
for the meeting.

     Any meeting of Noteholders shall be valid without notice if the holders of
all Notes then outstanding are present in person or by proxy or if notice is
waived before or after the meeting by the holders of all Notes outstanding, and
if the Company and the Trustee are either present by duly authorized
representatives or have, before or after the meeting, waived notice.

     Section 10.3. Call of Meetings by Company or Noteholders. In case at any
                   ------------------------------------------
time the Company, pursuant to a resolution of its Board of Directors, or the
holders of at least ten percent (10%) in aggregate principal amount of the Notes
then outstanding, shall have requested the Trustee to call a meeting of
Noteholders, by written request setting forth in reasonable detail the action
proposed to be taken at the meeting, and the Trustee shall not have mailed the
notice of such meeting within twenty (20) days after receipt of such request,
then the Company or such Noteholders may determine the time and the place for
such meeting and may call such meeting to take any action authorized in Section
10.1, by mailing notice thereof as provided in Section 10.2.

     Section 10.4. Qualifications for Voting. To be entitled to vote at any
                   -------------------------
meeting of Noteholders a person shall (a) be a holder of one or more Notes on
the record date pertaining to such meeting or (b) be a

                                      -47-
<PAGE>

person appointed by an instrument in writing as proxy by a holder of one or more
Notes on the record date pertaining to such meeting. The only persons who shall
be entitled to be present or to speak at any meeting of Noteholders shall be the
persons entitled to vote at such meeting and their counsel and any
representatives of the Trustee and its counsel and any representatives of the
Company and its counsel.

     Section 10.5. Regulations. Notwithstanding any other provisions of this
                   -----------
Indenture, the Trustee may make such reasonable regulations as it may deem
advisable for any meeting of Noteholders, in regard to proof of the holding of
Notes and of the appointment of proxies, and in regard to the appointment and
duties of inspectors of votes, the submission and examination of proxies,
certificates and other evidence of the right to vote, and such other matters
concerning the conduct of the meeting as it shall think fit.

     The Trustee shall, by an instrument in writing, appoint a temporary
chairman of the meeting, unless the meeting shall have been called by the
Company or by Noteholders as provided in Section 10.3, in which case the Company
or the Noteholders calling the meeting, as the case may be, shall in like manner
appoint a temporary chairman.  A permanent chairman and a permanent secretary of
the meeting shall be elected by vote of the holders of a majority in principal
amount of the Notes represented at the meeting and entitled to vote at the
meeting.

     Subject to the provisions of Section 9.4, at any meeting each Noteholder or
proxyholder shall be entitled to one vote for each $1,000 principal amount of
Notes held or represented by him; provided, however, that no vote shall be cast
or counted at any meeting in respect of any Note challenged as not outstanding
and ruled by the chairman of the meeting to be not outstanding.  The chairman of
the meeting shall have no right to vote other than by virtue of Notes held by
him or instruments in writing as aforesaid duly designating him as the proxy to
vote on behalf of other Noteholders.  Any meeting of Noteholders duly called
pursuant to the provisions of Section 10.2 or 10.3 may be adjourned from time to
time by the holders of a majority of the aggregate principal amount of Notes
represented at the meeting, whether or not constituting a quorum, and the
meeting may be held as so adjourned without further notice.

     Section 10.6. Voting. The vote upon any resolution submitted to any meeting
                   ------
of Noteholders shall be by written ballot on which shall be subscribed the
signatures of the holders of Notes or of their representatives by proxy and the
outstanding principal amount of the Notes held or represented by them. The
permanent chairman of the meeting shall appoint two inspectors of votes who
shall count all votes cast at the meeting for or against any resolution and who
shall make and file with the secretary of the meeting their verified written
reports in duplicate of all votes cast at the meeting. A record in duplicate of
the proceedings of each meeting of Noteholders shall be prepared by the
secretary of the meeting and there shall be attached to said record the original
reports of the inspectors of votes on any vote by ballot taken thereat and
affidavits by one or more persons having knowledge of the facts setting forth a
copy of the notice of the meeting and showing that said notice was mailed as
provided in Section 10.2. The record shall show the principal amount of the
Notes voting in favor of or against any resolution. The record shall be signed
and verified by the affidavits of the permanent chairman and secretary of the
meeting and one of the duplicates shall be delivered to the Company and the
other to the Trustee to be preserved by the Trustee, the latter to have attached
thereto the ballots voted at the meeting.

     Any record so signed and verified shall be conclusive evidence of the
matters therein stated.

     Section 10.7. No Delay of Rights by Meeting. Nothing contained in this
                   -----------------------------
Article Ten shall be deemed or construed to authorize or permit, by reason of
any call of a meeting of Noteholders or any rights expressly or impliedly
conferred hereunder to make such call, any hindrance or delay in the exercise of
any

                                      -48-
<PAGE>

right or rights conferred upon or reserved to the Trustee or to the
Noteholders under any of the provisions of this Indenture or of the Notes.

                                ARTICLE ELEVEN

                            SUPPLEMENTAL INDENTURES

     Section 11.1. Supplemental Indentures Without Consent of Noteholders. The
                   ------------------------------------------------------
Company, when authorized by the resolutions of the Board of Directors, and the
Trustee may, from time to time, and at any time enter into an indenture or
indentures supplemental hereto for one or more of the following purposes:

            (a) make provision with respect to the conversion rights of the
holders of Notes pursuant to the requirements of Section 15.6 or Section 15.7
and the redemption obligations of the Company pursuant to the requirements of
Section 3.5(e) or Section 15.7 and to make any other modifications permitted or
required by 15.7.

            (b) subject to Article Four, to convey, transfer, assign, mortgage
or pledge to the Trustee as security for the Notes, any property or assets;

            (c) to evidence the succession of another Person to the Company, or
successive successions, and the assumption by the successor Person of the
covenants, agreements and obligations of the Company pursuant to Article Twelve;

            (d) to add to the covenants of the Company such further covenants,
restrictions or conditions as the Board of Directors and the Trustee shall
consider to be for the benefit of the holders of Notes, and to make the
occurrence, or the occurrence and continuance, of a default in any such
additional covenants, restrictions or conditions a default or an Event of
Default permitting the enforcement of all or any of the several remedies
provided in this Indenture as herein set forth; provided, however, that in
respect of any such additional covenant, restriction or condition, such
supplemental indenture may provide for a particular period of grace after
default (which period may be shorter or longer than that allowed in the case of
other defaults) or may provide for an immediate enforcement upon such default or
may limit the remedies available to the Trustee upon such default;

            (e) to provide for the issuance under this Indenture of Notes in
coupon form (including Notes registrable as to principal only) and to provide
for exchangeability of such Notes with the Notes issued hereunder in fully
registered form and to make all appropriate changes for such purpose;

            (f) to cure any ambiguity or to correct or supplement any provision
contained herein or in any supplemental indenture that may be defective or
inconsistent with any other provision contained herein or in any supplemental
indenture, or to make such other provisions in regard to matters or questions
arising under this Indenture that shall not materially adversely affect the
interests of the holders of the Notes;

            (g) to evidence and provide for the acceptance of appointment
hereunder by a successor Trustee with respect to the Notes; or

            (h) to modify, eliminate or add to the provisions of this Indenture
to such extent as shall be necessary to effect the qualifications of this
Indenture under the Trust Indenture Act, or under any similar federal statute
hereafter enacted.

                                      -49-
<PAGE>

     Upon the written request of the Company, accompanied by a copy of the
resolutions of the Board of Directors certified by its Secretary or Assistant
Secretary authorizing the execution of any supplemental indenture, the Trustee
is hereby authorized to join with the Company in the execution of any such
supplemental indenture, to make any further appropriate agreements and
stipulations that may be therein contained and to accept the conveyance,
transfer and assignment of any property thereunder, but the Trustee shall not be
obligated to, but may in its discretion, enter into any supplemental indenture
that affects the Trustee's own rights, duties or immunities under this Indenture
or otherwise.

     Any supplemental indenture authorized by the provisions of this Section
11.1 may be executed by the Company and the Trustee without the consent of the
holders of any of the Notes at the time outstanding, notwithstanding any of the
provisions of Section 11.2.

     Notwithstanding any other provision of the Indenture or the Notes, the
Registration Rights Agreement and the obligation to pay Liquidated Damages
thereunder may be amended, modified or waived in accordance with the provisions
of the Registration Rights Agreement.

     Section 11.2. Supplemental Indenture with Consent of Noteholders. With the
                   --------------------------------------------------
consent (evidenced as provided in Article Nine) of the holders of not less than
a majority in aggregate principal amount of the Notes at the time outstanding,
the Company, when authorized by the resolutions of the Board of Directors, and
the Trustee may, from time to time and at any time, enter into an indenture or
indentures supplemental hereto for the purpose of adding any provisions to or
changing in any manner or eliminating any of the provisions of this Indenture or
any supplemental indenture or of modifying in any manner the rights of the
holders of the Notes; provided, however, that no such supplemental indenture
shall (i) extend the fixed maturity of any Note, or reduce the rate or extend
the time of payment of interest thereon, or reduce the principal amount thereof
or premium, if any, thereon, or reduce any amount payable on redemption thereof,
or impair the right of any Noteholder to institute suit for the payment thereof,
or make the principal thereof or interest or premium, if any, thereon payable in
any coin or currency other than that provided in the Notes, or modify the
provisions of this Indenture with respect to the subordination of the Notes in a
manner adverse to the Noteholders in any material respect, or change the
obligation of the Company to redeem any Note upon the happening of a Fundamental
Change in a manner adverse to the holder of Notes, or impair the right to
convert the Notes into Common Stock subject to the terms set forth herein,
including Section 15.6, in each case, without the consent of the holder of each
Note so affected, or (ii) reduce the aforesaid percentage of Notes, the holders
of which are required to consent to any such supplemental indenture, without the
consent of the holders of all Notes then outstanding.

     Upon the written request of the Company, accompanied by a copy of the
resolutions of the Board of Directors certified by its Secretary or Assistant
Secretary authorizing the execution of any such supplemental indenture, and upon
the filing with the Trustee of evidence of the consent of Noteholders as
aforesaid, the Trustee shall join with the Company in the execution of such
supplemental indenture unless such supplemental indenture affects the Trustee's
own rights, duties or immunities under this Indenture or otherwise, in which
case the Trustee may in its discretion, but shall not be obligated to, enter
into such supplemental indenture.

     It shall not be necessary for the consent of the Noteholders under this
Section 11.2 to approve the particular form of any proposed supplemental
indenture, but it shall be sufficient if such consent shall approve the
substance thereof.

                                      -50-
<PAGE>

     Section 11.3. Effect of Supplemental Indenture. Any supplemental indenture
                   --------------------------------
executed pursuant to the provisions of this Article Eleven shall comply with the
Trust Indenture Act, as then in effect, provided that this Section 11.3 shall
not require such supplemental indenture or the Trustee to be qualified under the
Trust Indenture Act prior to the time such qualification is in fact required
under the terms of the Trust Indenture Act or the Indenture has been qualified
under the Trust Indenture Act, nor shall it constitute any admission or
acknowledgment by any party to such supplemental indenture that any such
qualification is required prior to the time such qualification is in fact
required under the terms of the Trust Indenture Act or the Indenture has been
qualified under the Trust Indenture Act. Upon the execution of any supplemental
indenture pursuant to the provisions of this Article Eleven, this Indenture
shall be and be deemed to be modified and amended in accordance therewith and
the respective rights, limitation of rights, obligations, duties and immunities
under this Indenture of the Trustee, the Company and the holders of Notes shall
thereafter be determined, exercised and enforced hereunder, subject in all
respects to such modifications and amendments and all the terms and conditions
of any such supplemental indenture shall be and be deemed to be part of the
terms and conditions of this Indenture for any and all purposes.

     Section 11.4. Notation on Notes. Notes authenticated and delivered after
                   -----------------
the execution of any supplemental indenture pursuant to the provisions of this
Article Eleven may bear a notation in form approved by the Trustee as to any
matter provided for in such supplemental indenture. If the Company or the
Trustee shall so determine, new Notes so modified as to conform, in the opinion
of the Trustee and the Board of Directors, to any modification of this Indenture
contained in any such supplemental indenture may, at the Company's expense, be
prepared and executed by the Company, authenticated by the Trustee (or an
authenticating agent duly appointed by the Trustee pursuant to Section 16.11)
and delivered in exchange for the Notes then outstanding, upon surrender of such
Notes then outstanding.

     Section 11.5. Evidence of Compliance of Supplemental Indenture to be
                   ------------------------------------------------------
Furnished to Trustee. Prior to entering into any supplemental indenture, the
--------------------
Trustee may request an Officers' Certificate and an Opinion of Counsel as
conclusive evidence that any supplemental indenture executed pursuant hereto
complies with the requirements of this Article Eleven.

                                ARTICLE TWELVE

               CONSOLIDATION, MERGER, SALE, CONVEYANCE AND LEASE


Section 12.1. Company May Consolidate, Etc on Certain Terms. Subject to the
              ---------------------------------------------
provisions of Section 12.2, nothing contained in this Indenture or in any of the
Notes shall prevent any consolidation or merger of the Company with or into any
other Person or Persons (whether or not affiliated with the Company), or
successive consolidations or mergers in which the Company or its successor or
successors shall be a party or parties, or shall prevent any sale, conveyance or
lease (or successive sales, conveyances or leases) of all or substantially all
of the property of the Company, to any other Person (whether or not affiliated
with the Company), authorized to acquire and operate the same and that shall be
organized under the laws of the United States of America, any state thereof or
the District of Columbia; provided, however, that upon any such consolidation,
merger, sale, conveyance or lease, the due and punctual payment of the principal
of and premium, if any, and interest (including Liquidated Damages, if any) on
all of the Notes, according to their tenor and the due and punctual performance
and observance of all of the covenants and conditions of this Indenture to be
performed by the Company, shall be expressly assumed, by supplemental indenture
satisfactory in form to the Trustee, executed and delivered to the Trustee by
the Person (if other than the Company) formed by such consolidation, or into
which the Company shall have been merged, or by the

                                      -51-
<PAGE>

Person that shall have
acquired or leased such property, and such supplemental indenture shall provide
for the applicable conversion rights set forth in Section 15.6.

     Section 12.2. Successor Corporation to be Substituted. In case of any such
                   ---------------------------------------
consolidation, merger, sale, conveyance or lease and upon the assumption by the
successor Person, by supplemental indenture, executed and delivered to the
Trustee and satisfactory in form to the Trustee, of the due and punctual payment
of the principal of and premium, if any, and interest on all of the Notes and
the due and punctual performance of all of the covenants and conditions of this
Indenture to be performed by the Company, such successor Person shall succeed to
and be substituted for the Company, with the same effect as if it had been named
herein as the party of this first part. Such successor Person thereupon may
cause to be signed, and may issue either in its own name or in the name of At
Home Corporation any or all of the Notes, issuable hereunder that theretofore
shall not have been signed by the Company and delivered to the Trustee; and,
upon the order of such successor Person instead of the Company and subject to
all the terms, conditions and limitations in this Indenture prescribed, the
Trustee shall authenticate and shall deliver, or cause to be authenticated and
delivered, any Notes that previously shall have been signed and delivered by the
officers of the Company to the Trustee for authentication, and any Notes that
such successor Person thereafter shall cause to be signed and delivered to the
Trustee for that purpose. All the Notes so issued shall in all respects have the
same legal rank and benefit under this Indenture as the Notes theretofore or
thereafter issued in accordance with the terms of this Indenture as though all
of such Notes had been issued at the date of the execution hereof. In the event
of any such consolidation, merger, sale, conveyance or lease, the Person named
as the "Company" in the first paragraph of this Indenture or any successor that
shall thereafter have become such in the manner prescribed in this Article
Twelve may be dissolved, wound up and liquidated at any time thereafter and such
Person shall be released from its liabilities as obligor and maker of the Notes
and from its obligations under this Indenture.

     In case of any such consolidation, merger, sale, conveyance or lease, such
changes in phraseology and form (but not in substance) may be made in the Notes
thereafter to be issued as may be appropriate.

     Section 12.3. Opinion of Counsel to be Given Trustee. The Trustee shall
                   --------------------------------------
receive an Officers' Certificate and an Opinion of Counsel as conclusive
evidence that any such consolidation, merger, sale, conveyance or lease and any
such assumption complies with the provisions of this Article Twelve.

                               ARTICLE THIRTEEN

                    SATISFACTION AND DISCHARGE OF INDENTURE

     Section 13.1. Discharge of Indenture. When (a) the Company shall deliver to
                   ----------------------
the Trustee for cancellation all Notes theretofore authenticated (other than any
Notes that have been destroyed, lost or stolen and in lieu of or in substitution
for which other Notes shall have been authenticated and delivered) and not
theretofore canceled, or (b) all the Notes not theretofore canceled or delivered
to the Trustee for cancellation shall have become due and payable, or are by
their terms to become due and payable within one year or are to be called for
redemption within one year under arrangements satisfactory to the Trustee for
the giving of notice of redemption, and the Company shall deposit with the
Trustee, in trust, funds sufficient to pay at maturity or upon redemption of all
of the Notes (other than any Notes that shall have been mutilated, destroyed,
lost or stolen and in lieu of or in substitution for which other Notes shall
have been authenticated and delivered) not theretofore canceled or delivered to
the Trustee for cancellation, including principal and premium, if any, and
interest due or to become due to such date of maturity or redemption date, as
the case may be, accompanied by a verification report, as to the sufficiency of
the deposited amount, from an

                                      -52-
<PAGE>

independent certified accountant or other financial professional satisfactory to
the Trustee, and if the Company shall also pay or cause to be paid all other
sums payable hereunder by the Company, then this Indenture shall cease to be of
further effect (except as to (i) remaining rights of registration of transfer,
substitution and exchange and conversion of Notes, (ii) rights hereunder of
Noteholders to receive payments of principal of and premium, if any, and
interest on, the Notes and the other rights, duties and obligations of
Noteholders, as beneficiaries hereof with respect to the amounts, if any, so
deposited with the Trustee and (iii) the rights, obligations and immunities of
the Trustee hereunder), and the Trustee, on written demand of the Company
accompanied by an Officers' Certificate and an Opinion of Counsel as required by
Section 16.5 and at the cost and expense of the Company, shall execute proper
instruments acknowledging satisfaction of and discharging this Indenture; the
Company, however, hereby agrees to reimburse the Trustee for any costs or
expenses thereafter reasonably and properly incurred by the Trustee and to
compensate the Trustee for any services thereafter reasonably and properly
rendered by the Trustee in connection with this Indenture or the Notes.

     Section 13.2. Deposited Monies to be Held in Trust by Trustee. Subject to
                   -----------------------------------------------
Section 13.4, all monies deposited with the Trustee pursuant to Section 13.1,
provided such deposit was not in violation of Article Four, shall be held in
trust for the sole benefit of the Noteholders and not to be subject to the
subordination provisions of Article Four, and such monies shall be applied by
the Trustee to the payment, either directly or through any paying agent
(including the Company if acting as its own paying agent), to the holders of the
particular Notes for the payment or redemption of which such monies have been
deposited with the Trustee, of all sums due and to become due thereon for
principal and interest and premium, if any.

     Section 13.3. Paying Agent to Repay Monies Held. Upon the satisfaction and
                   ---------------------------------
discharge of this Indenture, all monies then held by any paying agent of the
Notes (other than the Trustee) shall, upon written request of the Company, be
repaid to it or paid to the Trustee, and thereupon such paying agent shall be
released from all further liability with respect to such monies.

     Section 13.4. Return of Unclaimed Monies. Subject to the requirements of
                   --------------------------
applicable law, any monies deposited with or paid to the Trustee for payment of
the principal of, premium, if any, or interest on Notes and not applied but
remaining unclaimed by the holders of Notes for two years after the date upon
which the principal of, premium, if any, or interest on such Notes, as the case
may be, shall have become due and payable, shall be repaid to the Company by the
Trustee on demand and all liability of the Trustee shall thereupon cease with
respect to such monies; and the holder of any of the Notes shall thereafter look
only to the Company for any payment that such holder may be entitled to collect
unless an applicable abandoned property law designates another Person.

     Section 13.5. Reinstatement. If the Trustee or the paying agent is unable
                   -------------
to apply any money in accordance with Section 13.2 by reason of any order or
judgment of any court or governmental authority enjoining, restraining or
otherwise prohibiting such application, the Company's obligations under this
Indenture and the Notes shall be revived and reinstated as though no deposit had
occurred pursuant to Section 13.1 until such time as the Trustee or the paying
agent is permitted to apply all such money in accordance with Section 13.2;
provided, however, that if the Company makes any payment of interest on or
principal of any Note following the reinstatement of its obligations, the
Company shall be subrogated to the rights of the holders of such Notes to
receive such payment from the money held by the Trustee or paying agent.

                                      -53-
<PAGE>

                               ARTICLE FOURTEEN


                           IMMUNITY OF INCORPORATORS,
                      STOCKHOLDERS, OFFICERS AND DIRECTORS


    Section 14.1.  Indenture and Notes Solely Corporate Obligations. No recourse
                   ------------------------------------------------
for the payment of the principal of or premium, if any, or interest on any Note,
or for any claim based thereon or otherwise in respect thereof, and no recourse
under or upon any obligation, covenant or agreement of the Company in this
Indenture or in any supplemental indenture or in any Note, or because of the
creation of any indebtedness represented thereby, shall be had against any
incorporator, stockholder, employee, agent, officer, director or subsidiary, as
such, past, present or future, of the Company or of any successor corporation,
either directly or through the Company or any successor corporation, whether by
virtue of any constitution, statute or rule of law, or by the enforcement of any
assessment or penalty or otherwise; it being expressly understood that all such
liability is hereby expressly waived and released as a condition of, and as a
consideration for, the execution of this Indenture and the issue of the Notes.

                                ARTICLE FIFTEEN

                              CONVERSION OF NOTES

    Section 15.1.  Right to Convert. Subject to and upon compliance with the
                   ----------------
provisions of this Indenture, including, without limitation, Article Four, the
holder of any Note shall have the right, at its option, at any time after the
original issuance of the Notes hereunder through the close of business on the
final maturity date of the Notes (except that, with respect to any Note or
portion of a Note that shall be called for redemption, such right shall
terminate, except as provided in Section 15.2, Section 3.2 or Section 3.4, at
the close of business on the Business Day next preceding the date fixed for
redemption of such Note or portion of a Note unless the Company shall default in
payment due upon redemption thereof) to convert the principal amount of any such
Note, or any portion of such principal amount which is $1,000 or an integral
multiple thereof, into that number of fully paid and non-assessable shares of
Common Stock (as such shares shall then be constituted) obtained by dividing the
principal amount of the Note or portion thereof surrendered for conversion by
the Conversion Price in effect at such time, by surrender of the Note so to be
converted in whole or in part in the manner provided, together with any required
funds, in Section 15.2. A Note in respect of which a holder is exercising its
option to require redemption upon a Fundamental Change pursuant to Section 3.5
may be converted only if such holder withdraws its election to exercise in
accordance with Section 3.5. A holder of Notes is not entitled to any rights of
a holder of Common Stock until such holder has converted his Notes to Common
Stock, and only to the extent such Notes are deemed to have been converted to
Common Stock under this Article Fifteen.

    Section 15.2.  Exercise of Conversion Privilege; Issuance of Common Stock on
                   -------------------------------------------------------------
Conversion; No Adjustment for Interest or Dividends.  In order to exercise the
---------------------------------------------------
conversion privilege with respect to any Note in certificated form, the holder
of any such Note to be converted in whole or in part shall surrender such Note,
duly endorsed, at an office or agency maintained by the Company pursuant to
Section 5.2, accompanied by the funds, if any, required by the penultimate
paragraph of this Section 15.2, and shall give written notice of conversion in
the form provided on the Notes (or such other notice which is acceptable to the
Company) to the office or agency that the holder elects to convert such Note or
the portion thereof specified in said notice. Such notice shall also state the
name or names (with address or addresses) in which the certificate or

                                      -54-
<PAGE>

certificates for shares of Common Stock which shall be issuable on such
conversion shall be issued, and shall be accompanied by transfer taxes, if
required pursuant to Section 15.8. Each such Note surrendered for conversion
shall, unless the shares issuable on conversion are to be issued in the same
name as the registration of such Note, be duly endorsed by, or be accompanied by
instruments of transfer in form satisfactory to the Company duly executed by,
the holder or his duly authorized attorney.

     In order to exercise the conversion privilege with respect to any interest
in a Global Note, the beneficial holder must complete, or cause to be completed,
the appropriate instruction form for conversion pursuant to the Depository's
book-entry conversion program, deliver, or cause to be delivered, by book-entry
delivery an interest in such Global Note, furnish appropriate endorsements and
transfer documents if required by the Company or the Trustee or conversion
agent, and pay the funds, if any, required by this Section 15.2 and any transfer
taxes if required pursuant to Section 15.8.

     As promptly as practicable after satisfaction of the requirements for
conversion set forth above, subject to compliance with any restrictions on
transfer if shares issuable on conversion are to be issued in a name other than
that of the Noteholder (as if such transfer were a transfer of the Note or Notes
(or portion thereof) so converted), the Company shall issue and shall deliver to
such Noteholder at the office or agency maintained by the Company for such
purpose pursuant to Section 5.2, a certificate or certificates for the number of
full shares of Common Stock issuable upon the conversion of such Note or portion
thereof as determined by the Company in accordance with the provisions of this
Article Fifteen and a check or cash in respect of any fractional interest in
respect of a share of Common Stock arising upon such conversion, calculated by
the Company as provided in Section 15.3.  In case any Note of a denomination
greater than $1,000 shall be surrendered for partial conversion, and subject to
Section 2.3, the Company shall execute and the Trustee shall authenticate and
deliver to the holder of the Note so surrendered, without charge to him, a new
Note or Notes in authorized denominations in an aggregate principal amount equal
to the unconverted portion of the surrendered Note.

     Each conversion shall be deemed to have been effected as to any such Note
(or portion thereof) on the date on which the requirements set forth above in
this Section 15.2 have been satisfied as to such Note (or portion thereof), and
the Person in whose name any certificate or certificates for shares of Common
Stock shall be issuable upon such conversion shall be deemed to have become on
said date the holder of record of the shares represented thereby; provided,
however, that any such surrender on any date when the stock transfer books of
the Company shall be closed shall constitute the Person in whose name the
certificates are to be issued as the record holder thereof for all purposes on
the next succeeding day on which such stock transfer books are open, but such
conversion shall be at the Conversion Price in effect on the date upon which
such Note shall be surrendered.

     No adjustment in respect of interest on any Note converted or dividends on
any shares issued upon conversion of such Note will be made upon any conversion
except as set forth in the next sentence.  If this Note (or portion hereof) is
surrendered for conversion during the period from the close of business on any
record date for the payment of interest to the close of business on the Business
Day preceding the following interest payment date and either (x) has not been
called for redemption on a redemption date that occurs during such period or (y)
is not to be redeemed in connection with a Fundamental Change on a Repurchase
Date that occurs during such period, this Note (or portion hereof being
converted) must be accompanied by an amount, in New York Clearing House funds or
other funds acceptable to the Company, equal to the interest payable on such
interest payment date on the principal amount being converted; provided,
however, that no such payment shall be required if there shall exist at the time
of conversion a default in the payment of interest on the Notes.

                                      -55-
<PAGE>

     Upon the conversion of an interest in a Global Note, the Trustee (or other
conversion agent appointed by the Company), or the Custodian at the direction of
the Trustee (or other conversion agent appointed by the Company), shall make a
notation on such Global Note as to the reduction in the principal amount
represented thereby.  The Company shall notify the Trustee in writing of any
conversions of Notes effected through any conversion agent other than the
Trustee.

     Section 15.3.  Cash Payments in Lieu of Fractional Shares. No fractional
                    ------------------------------------------
shares of Common Stock or scrip representing fractional shares shall be issued
upon conversion of Notes. If more than one Note shall be surrendered for
conversion at one time by the same holder, the number of full shares that shall
be issuable upon conversion shall be computed on the basis of the aggregate
principal amount of the Notes (or specified portions thereof to the extent
permitted hereby) so surrendered. If any fractional share of stock would be
issuable upon the conversion of any Note or Notes, the Company shall make an
adjustment and payment therefor in cash at the current market price thereof to
the holder of Notes. The current market price of a share of Common Stock shall
be the Closing Price on the last Business Day immediately preceding the day on
which the Notes (or specified portions thereof) are deemed to have been
converted.

     Section 15.4.  Conversion Price. The conversion price shall be as specified
                    ----------------
in the form of Note (herein called the "Conversion Price") attached as Exhibit A
hereto, subject to adjustment as provided in this Article Fifteen.

     Section 15.5.  Adjustment of Conversion Price. The Conversion Price shall
                    ------------------------------
be adjusted from time to time by the Company as follows:

        (a)  In case the Company shall hereafter pay a dividend or make a
distribution to all holders of the outstanding Common Stock in shares of Common
Stock, the Conversion Price shall be reduced so that the same shall equal the
price determined by multiplying the Conversion Price in effect at the opening of
business on the date following the date fixed for the determination of
stockholders entitled to receive such dividend or other distribution by a
fraction, the numerator of which shall be the number of shares of the Common
Stock outstanding at the close of business on the date fixed for such
determination, and the denominator of which shall be the sum of such number of
shares and the total number of shares constituting such dividend or other
distribution, such reduction to become effective immediately after the opening
of business on the day following the date fixed for such determination. For the
purpose of this paragraph (a), the number of shares of Common Stock at any time
outstanding shall not include shares held in the treasury of the Company. The
Company will not pay any dividend or make any distribution on shares of Common
Stock held in the treasury of the Company. If any dividend or distribution of
the type described in this Section 15.5(a) is declared but not so paid or made,
the Conversion Price shall again be adjusted to the Conversion Price that would
then be in effect if such dividend or distribution had not been declared.

        (b)  In case the Company shall issue rights or warrants to all holders
of its outstanding shares of Common Stock entitling them (for a period expiring
within forty-five (45) days after the date fixed for determination of
stockholders entitled to receive such rights or warrants) to subscribe for or
purchase shares of Common Stock at a price per share less than the Current
Market Price (as defined below) on the date fixed for determination of
stockholders entitled to receive such rights or warrants, the Conversion Price
shall be adjusted so that the same shall equal the price determined by
multiplying the Conversion Price in effect immediately prior to the date fixed
for determination of stockholders entitled to receive such rights or warrants by
a fraction, the numerator of which shall be the number of shares of Common Stock
outstanding at the close of business on the date fixed for determination of
stockholders entitled to receive such rights or warrants plus the number of
shares that the aggregate offering price of the total number of shares so
offered

                                      -56-
<PAGE>

would purchase at such Current Market Price, and the denominator of which shall
be the number of shares of Common Stock outstanding on the date fixed for
determination of stockholders entitled to receive such rights or warrants plus
the total number of additional shares of Common Stock offered for subscription
or purchase. Such adjustment shall be successively made whenever any such rights
or warrants are issued, and shall become effective immediately after the opening
of business on the day following the date fixed for determination of
stockholders entitled to receive such rights or warrants. To the extent that
shares of Common Stock are not delivered after the expiration of such rights or
warrants, the Conversion Price shall be readjusted to the Conversion Price that
would then be in effect had the adjustments made upon the issuance of such
rights or warrants been made on the basis of delivery of only the number of
shares of Common Stock actually delivered. In the event that such rights or
warrants are not so issued, the Conversion Price shall again be adjusted to be
the Conversion Price that would then be in effect if such date fixed for the
determination of stockholders entitled to receive such rights or warrants had
not been fixed. In determining whether any rights or warrants entitle the
holders to subscribe for or purchase shares of Common Stock at less than such
Current Market Price, and in determining the aggregate offering price of such
shares of Common Stock, there shall be taken into account any consideration
received by the Company for such rights or warrants and any amount payable on
exercise or conversion thereof, the value of such consideration, if other than
cash, to be determined by the Board of Directors.

        (c)  In case outstanding shares of Common Stock shall be subdivided into
a greater number of shares of Common Stock, the Conversion Price in effect at
the opening of business on the day following the day upon which such subdivision
becomes effective shall be proportionately reduced, and conversely, in case
outstanding shares of Common Stock shall be combined into a smaller number of
shares of Common Stock, the Conversion Price in effect at the opening of
business on the day following the day upon which such combination becomes
effective shall be proportionately increased, such reduction or increase, as the
case may be, to become effective immediately after the opening of business on
the day following the day upon which such subdivision or combination becomes
effective.

        (d)  In case the Company shall, by dividend or otherwise, distribute to
all holders of its Common Stock shares of any class of capital stock of the
Company (other than any dividends or distributions to which Section 15.5(a)
applies) or evidences of its indebtedness or assets (including securities, but
excluding any rights or warrants referred to in Section 15.5(b), and excluding
any dividend or distribution (x) paid exclusively in cash or (y) referred to in
Section 15.5(a) (any of the foregoing hereinafter in this Section 15.5(d) called
the "Securities")), then, in each such case, the Conversion Price shall be
reduced so that the same shall be equal to the price determined by multiplying
the Conversion Price in effect on the Record Date with respect to such
distribution by a fraction, the numerator of which shall be the Current Market
Price per share of the Common Stock on such Record Date less the fair market
value (as determined by the Board of Directors, whose determination shall be
conclusive, and described in a resolution of the Board of Directors) on the
Record Date of the portion of the Securities so distributed applicable to one
share of Common Stock and the denominator of which shall be the Current Market
Price per share of the Common Stock, such reduction to become effective
immediately prior to the opening of business on the day following such Record
Date; provided, however, that in the event the then fair market value (as so
determined) of the portion of the Securities so distributed applicable to one
share of Common Stock is equal to or greater than the Current Market Price of
the Common Stock on the Record Date, in lieu of the foregoing adjustment,
adequate provision shall be made so that each Noteholder shall have the right to
receive upon conversion the amount of Securities such holder would have received
had such holder converted each Note on the Record Date. In the event that such
dividend or distribution is not so paid or made, the Conversion Price shall
again be adjusted to be the Conversion Price that would then be in effect if
such dividend or distribution had not been declared. If the Board of Directors
determines the fair market value of any distribution for purposes of this

                                      -57-
<PAGE>

Section 15.5(d) by reference to the actual or when issued trading market for any
securities, it must in doing so consider the prices in such market over the same
period used in computing the Current Market Price of the Common Stock.

     In the event that the Company implements a rights plan (the "Rights Plan"),
upon conversion of the Notes into Common Stock, to the extent that the Rights
Plan is still in effect upon such conversion, the holders of Notes will receive,
in addition to the Common Stock, the rights described therein (whether or not
the rights have separated from the Common Stock at the time of conversion),
subject to the limitations set forth in the Rights Plan.  Any distribution of
rights or warrants pursuant to a Rights Plan that comply with the requirements
set forth in the immediately preceding sentence of this paragraph shall not
constitute a distribution of rights or warrants for purposes of this Section
15.5(d).

     Rights or warrants distributed by the Company to all holders of Common
Stock entitling the holders thereof to subscribe for or purchase shares of the
Company's capital stock (either initially or under certain circumstances), which
rights or warrants, until the occurrence of a specified event or events
("Trigger Event"): (i) are deemed to be transferred with such shares of Common
Stock; (ii) are not exercisable; and (iii) are also issued in respect of future
issuances of Common Stock, shall be deemed not to have been distributed for
purposes of this Section 15.5 (and no adjustment to the Conversion Price under
this Section 15.5 will be required) until the occurrence of the earliest Trigger
Event, whereupon such rights and warrants shall be deemed to have been
distributed and an appropriate adjustment (if any is required) to the Conversion
Price shall be made under this Section 15.5(d).  If any such right or warrant,
including any such existing rights or warrants distributed prior to the date of
this Indenture, are subject to events, upon the occurrence of which such rights
or warrants become exercisable to purchase different securities, evidences of
indebtedness or other assets, then the date of the occurrence of any and each
such event shall be deemed to be the date of distribution and record date with
respect to new rights or warrants with such rights (and a termination or
expiration of the existing rights or warrants without exercise by any of the
holders thereof).  In addition, in the event of any distribution (or deemed
distribution) of rights or warrants, or any Trigger Event or other event (of the
type described in the preceding sentence) with respect thereto that was counted
for purposes of calculating a distribution amount for which an adjustment to the
Conversion Price under this Section 15.5 was made, (1) in the case of any such
rights or warrants that shall all have been redeemed or repurchased without
exercise by any holders thereof, the Conversion Price shall be readjusted upon
such final redemption r repurchase to give effect to such distribution or
Trigger Event, as the case may be, as though it were a cash distribution, equal
to the per share redemption or repurchase price received by a holder or holders
of Common Stock with respect to such rights or warrants (assuming such holder
had retained such rights or warrants), made to all holders of Common Stock as of
the date of such redemption or repurchase, and (2) in the case of such rights or
warrants that shall have expired or been terminated without exercise by any
holders thereof, the Conversion Price shall be readjusted as if such rights and
warrants had not been issued.

     No adjustment of the Conversion Price shall be made pursuant to this
Section 15.5(d) in respect of rights or warrants distributed or deemed
distributed on any Trigger Event to the extent that such rights or warrants are
actually distributed, or reserved by the Company for distribution to holders of
Notes upon conversion by such holders of Notes to Common Stock.

     For purposes of this Section 15.5(d) and Sections 15.5(a) and (b), any
dividend or distribution to which this Section 15.5(d) is applicable that also
includes shares of Common Stock, or rights or warrants to subscribe for or
purchase shares of Common Stock (or both), shall be deemed instead to be (1) a
dividend or distribution of the evidences of indebtedness, assets or shares of
capital stock other than such shares of Common Stock or rights or warrants (and
any Conversion Price reduction required by this Section 15.5(d)

                                      -58-
<PAGE>

with respect to such dividend or distribution shall then be made) immediately
followed by (2) a dividend or distribution of such shares of Common Stock or
such rights or warrants (and any further Conversion Price reduction required by
Sections 15.5(a) and (b) with respect to such dividend or distribution shall
then be made), except (A) the Record Date of such dividend or distribution shall
be substituted as "the date fixed for the determination of stockholders entitled
to receive such dividend or other distribution", "the date fixed for the
determination of stockholders entitled to receive such rights or warrants" and
"the date fixed for such determination" within the meaning of Sections 15.5(a)
and (b), and (B) any shares of Common Stock included in such dividend or
distribution shall not be deemed "outstanding at the close of business on the
date fixed for such determination" within the meaning of Section 15.5(a).

        (e)  In case the Company shall, by dividend or otherwise, distribute to
all holders of its Common Stock cash (excluding (x) any quarterly cash dividend
on the Common Stock to the extent the aggregate cash dividend per share of
Common Stock in any fiscal quarter does not exceed the greater of (A) the amount
per share of Common Stock of the next preceding quarterly cash dividend on the
Common Stock to the extent that such preceding quarterly dividend did not
require any adjustment of the Conversion Price pursuant to this Section 15.5(e)
(as adjusted to reflect subdivisions, or combinations of the Common Stock), and
(B) 3.75% of the arithmetic average of the Closing Price (determined as set
forth in Section 15.5(h)) during the ten Trading Days (as defined in Section
15.5(h)) immediately prior to the date of declaration of such dividend, and (y)
any dividend or distribution in connection with the liquidation, dissolution or
winding up of the Company, whether voluntary or involuntary), then, in such
case, the Conversion Price shall be reduced so that the same shall equal the
price determined by multiplying the Conversion Price in effect immediately prior
to the close of business on such record date by a fraction, the numerator of
which shall be the Current Market Price of the Common Stock on the record date
less the amount of cash so distributed (and not excluded as provided above)
applicable to one share of Common Stock, and the denominator of which shall be
such Current Market Price of the Common Stock, such reduction to be effective
immediately prior to the opening of business on the day following the record
date; provided, however, that in the event the portion of the cash so
distributed applicable to one share of Common Stock is equal to or greater than
the Current Market Price of the Common Stock on the record date, in lieu of the
foregoing adjustment, adequate provision shall be made so that each Noteholder
shall have the right to receive upon conversion the amount of cash such holder
would have received had such holder converted each Note on the record date. In
the event that such dividend or distribution is not so paid or made, the
Conversion Price shall again be adjusted to be the Conversion Price that would
then be in effect if such dividend or distribution had not been declared. If any
adjustment is required to be made as set forth in this Section 15.5(e) as a
result of a distribution that is a quarterly dividend, such adjustment shall be
based upon the amount by which such distribution exceeds the amount of the
quarterly cash dividend permitted to be excluded pursuant hereto. If an
adjustment is required to be made as set forth in this Section 15.5(e) above as
a result of a distribution that is not a quarterly dividend, such adjustment
shall be based upon the full amount of the distribution.

        (f)  In case a tender or exchange offer made by the Company or any
Subsidiary for all or any portion of the Common Stock shall expire and such
tender or exchange offer (as amended upon the expiration thereof) shall require
the payment to stockholders of consideration per share of Common Stock having a
fair market value (as determined by the Board of Directors, whose determination
shall be conclusive and described in a resolution of the Board of Directors)
that as of the last time (the "Expiration Time") tenders or exchanges may be
made pursuant to such tender or exchange offer (as it may be amended) exceeds
the Current Market Price of the Common Stock on the Trading Day next succeeding
the Expiration Time, the Conversion Price shall be reduced so that the same
shall equal the price determined by multiplying the Conversion Price in effect
immediately prior to the Expiration Time by a fraction the numerator of which

                                      -59-
<PAGE>

shall be the number of shares of Common Stock outstanding (including any
tendered or exchanged shares) at the Expiration Time multiplied by the Current
Market Price of the Common Stock on the Trading Day next succeeding the
Expiration Time and the denominator of which shall be the sum of (x) the fair
market value (determined as aforesaid) of the aggregate consideration payable to
stockholders based on the acceptance (up to any maximum specified in the terms
of the tender or exchange offer) of all shares validly tendered or exchanged and
not withdrawn as of the Expiration Time (the shares deemed so accepted, up to
any such maximum, being referred to as the "Purchased Shares") and (y) the
product of the number of shares of Common Stock outstanding (less any Purchased
Shares) at the Expiration Time and the Current Market Price of the Common Stock
on the Trading Day next succeeding the Expiration Time, such reduction to become
effective immediately prior to the opening of business on the Trading Day
following the Expiration Time. In the event that the Company is obligated to
purchase shares pursuant to any such tender or exchange offer, but the Company
is permanently prevented by applicable law from effecting any such purchases or
all such purchases are rescinded, the Conversion Price shall again be adjusted
to be the Conversion Price that would then be in effect if such tender or
exchange offer had not been made.

        (g)  In case of a tender or exchange offer made by a Person other than
the Company or any Subsidiary for an amount that increases the offeror's
ownership of Common Equity to more than twenty-five percent (25%) of the Common
Equity outstanding and that is for the Common Stock to the extent the cash and
value of any other consideration included in the payment per share of Common
Stock having a fair market value (as determined by the Board of Directors, whose
determination shall be conclusive, and described in a resolution of the Board of
Directors) that as of the last time (the "Offer Expiration Time") tenders or
exchanges may be made pursuant to such tender or exchange offer (as it shall
have been amended) that exceeds the Current Market Price of the Common Stock on
the Trading Day next succeeding the Offer Expiration Time, and in which, as of
the Offer Expiration Time the Board of Directors is not recommending rejection
of the offer, the Conversion Price shall be reduced so that the same shall equal
the price determined by multiplying the Conversion Price in effect immediately
prior to the Offer Expiration Time by a fraction the numerator of which shall be
the number of shares of Common Stock outstanding (including any tendered or
exchanged shares) at the Offer Expiration Time multiplied by the Current Market
Price of the Common Stock on the Trading Day next succeeding the Offer
Expiration Time and the denominator of which shall be the sum of (x) the fair
market value (determined as aforesaid) of the aggregate consideration payable to
stockholders based on the acceptance (up to any maximum specified in the terms
of the tender or exchange offer) of all shares validly tendered or exchanged and
not withdrawn as of the Offer Expiration Time (the shares deemed so accepted, up
to any such maximum, being referred to as the "Accepted Purchased Shares") and
(y) the product of the number of shares of Common Stock outstanding (less any
Accepted Purchased Shares) at the Offer Expiration Time and the Current Market
Price of the Common Stock on the Trading Day next succeeding the Offer
Expiration Time, such reduction to become effective immediately prior to the
opening of business on the Trading Day following the Offer Expiration Time. In
the event that such Person is obligated to purchase shares pursuant to any such
tender or exchange offer, but such Person is permanently prevented by applicable
law from effecting any such purchases or all such purchases are rescinded, the
Conversion Price shall again be adjusted to be the Conversion Price that would
then be in effect if such tender or exchange offer had not been made.
Notwithstanding the foregoing, the adjustment described in this Section 15.5(g)
shall not be made if, as of the Offer Expiration Time, the offering documents
with respect to such offer disclose a plan or intention to cause the Company to
engage in any transaction described in Article Twelve.

        (h)  For purposes of this Section 15.5, the following terms shall have
the meaning indicated:

                                      -60-
<PAGE>

             (1)  "Closing Price" with respect to any security on any day shall
        mean the closing sale price, regular way, on such day or, in case no
        such sale takes place on such day, the average of the reported closing
        bid and asked prices, regular way, in each case as quoted on the Nasdaq
        National Market or, if such security is not quoted or listed or admitted
        to trading on such Nasdaq National Market, on the principal national
        securities exchange or quotation system on which such security is quoted
        or listed or admitted to trading or, if not quoted or listed or admitted
        to trading on any national securities exchange or quotation system, the
        average of the closing bid and asked prices of such security on the
        over-the-counter market on the day in question as reported by the
        National Quotation Bureau Incorporated, or a similar generally accepted
        reporting service, or if not so available, in such manner as furnished
        by any New York Stock Exchange member firm selected from time to time by
        the Board of Directors for that purpose, or a price determined in good
        faith by the Board of Directors or, to the extent permitted by
        applicable law, a duly authorized committee thereof, whose determination
        shall be conclusive.

             (2)  "Current Market Price" shall mean the average of the daily
        Closing Prices per share of Common Stock for the ten consecutive Trading
        Days immediately prior to the date in question except as hereinafter
        provided for purposes of any computation under Section 15.5(f) or (g);
        provided, however, that (1) if the "ex" date (as hereinafter defined)
        for any event (other than the issuance or distribution requiring such
        computation and other than the tender or exchange offer requiring such
        computation under Section 15.5(f) or (g)) that requires an adjustment to
        the Conversion Price pursuant to Section 15.5(a), (b), (c), (d), (e),
        (f) or (g) occurs during such ten consecutive Trading Days, the Closing
        Price for each Trading Day prior to the "ex" date for such other event
        shall be adjusted by multiplying such Closing Price by the same fraction
        by which the Conversion Price is so required to be adjusted as a result
        of such other event, (2) if the "ex" date for any event (other than the
        issuance or distribution requiring such computation and other than the
        tender or exchange offer requiring such computation under Section
        15.5(f) or (g)) that requires an adjustment to the Conversion Price
        pursuant to Section 15.5(a), (b), (c), (d), (e), (f) or (g) occurs on or
        after the "ex" date for the issuance or distribution requiring such
        computation and prior to the day in question, the Closing Price for each
        Trading Day on and after the "ex" date for such other event shall be
        adjusted by multiplying such Closing Price by the reciprocal of the
        fraction by which the Conversion Price is so required to be adjusted as
        a result of such other event, and (3) if the "ex" date for the issuance
        or distribution requiring such computation is prior to the day in
        question, after taking into account any adjustment required pursuant to
        clause (1) or (2) of this proviso, the Closing Price for each Trading
        Day on or after such "ex" date shall be adjusted by adding thereto the
        amount of any cash and the fair market value (as determined by the Board
        of Directors or, to the extent permitted by applicable law, a duly
        authorized committee thereof in a manner consistent with any
        determination of such value for purposes of Section 15.5(d), (f) or (g),
        whose determination shall be conclusive and described in a resolution of
        the Board of Directors or such duly authorized committee thereof, as the
        case may be) of the evidences of indebtedness, shares of capital stock
        or assets being distributed applicable to one share of Common Stock as
        of the close of business on the day before such "ex" date. For purposes
        of any computation under Section 15.5(f) or (g), the "Current Market
        Price" of the Common Stock on any date shall be deemed to be the average
        of the daily Closing Prices per share of Common Stock for such day and
        the next two succeeding Trading Days; provided, however, that if the
        "ex" date for any event (other than the tender or exchange offer
        requiring such computation under Section 15.5(f) or (g)) that requires
        an
                                      -61-
<PAGE>

        adjustment to the Conversion Price pursuant to Section 15.5(a), (b),
        (c), (d), (e), (f) or (g) occurs on or after the Expiration Time or
        Offer Expiration Time, as the case may be, for the tender or exchange
        offer requiring such computation and prior to the day in question, the
        Closing Price for each Trading Day on and after the "ex" date for such
        other event shall be adjusted as provided in clauses (1), (2) and (3) of
        the proviso contained in the first sentence of this Section 15.5(h)(2).
        For purpose of this paragraph, the term "ex" date, (1) when used with
        respect to any issuance or distribution, means the first date on which
        the Common Stock trades, regular way, on the relevant exchange or in the
        relevant market from which the Closing Price was obtained without the
        right to receive such issuance or distribution, (2) when used with
        respect to any subdivision or combination of shares of Common Stock,
        means the first date on which the Common Stock trades, regular way, on
        such exchange or in such market after the time at which such subdivision
        or combination becomes effective, and (3) when used with respect to any
        tender or exchange offer means the first date on which the Common Stock
        trades, regular way, on such exchange or in such market after the
        Expiration Time or the Offer Expiration Time of such offer.

              (3)  "fair market value" shall mean the amount which a willing
        buyer would pay a willing seller in an arm's-length transaction.

              (4)  "Record Date" shall mean, with respect to any dividend,
        distribution or other transaction or event in which the holders of
        Common Stock have the right to receive any cash, securities or other
        property or in which the Common Stock (or other applicable security) is
        exchanged for or converted into any combination of cash, securities or
        other property, the date fixed for determination of stockholders
        entitled to receive such cash, securities or other property (whether
        such date is fixed by the Board of Directors or by statute, contract or
        otherwise).

              (5)  "Trading Day" shall mean (x) if the applicable security is
        quoted on the Nasdaq National Market, a day on which trades may be made
        thereon or (y) if the applicable security is listed or admitted for
        trading on the New York Stock Exchange or another national securities
        exchange, a day on which the New York Stock Exchange or another national
        securities exchange is open for business or (z) if the applicable
        security is not so listed, admitted for trading or quoted, any day other
        than a Saturday or Sunday or a day on which banking institutions in the
        State of New York are authorized or obligated by law or executive order
        to close.

        (i)   The Company may make such reductions in the Conversion Price, in
addition to those required by Sections 15.5(a), (b), (c), (d), (e), (f) or (g)
as the Board of Directors considers to be advisable to avoid or diminish any
income tax to holders of Common Stock or rights to purchase Common Stock
resulting from any dividend or distribution of stock (or rights to acquire
stock) or from any event treated as such for income tax purposes.

         To the extent permitted by applicable law, the Company from time to
time may reduce the Conversion Price by any amount for any period of time if the
period is at least twenty (20) days, the reduction is irrevocable during the
period and the Board of Directors shall have made a determination that such
reduction would be in the best interests of the Company, which determination
shall be conclusive.  Whenever the Conversion Price is reduced pursuant to the
preceding sentence, the Company shall mail to holders of record of the Notes a
notice of the reduction at least fifteen (15) days prior to the date the reduced
Conversion

                                      -62-
<PAGE>

Price takes effect, and such notice shall state the reduced Conversion Price and
the period during which it will be in effect.

         (j)  No adjustment in the Conversion Price shall be required unless
such adjustment would require an increase or decrease of at least one percent
(1%) in such price; provided, however, that any adjustments that by reason of
this Section 15.5(j) are not required to be made shall be carried forward and
taken into account in any subsequent adjustment. All calculations under this
Article Fifteen shall be made by the Company and shall be made to the nearest
cent or to the nearest one-hundredth (1/100) of a share, as the case may be. No
adjustment need be made for rights to purchase Common Stock pursuant to a
Company plan for reinvestment of dividends or interest. To the extent the Notes
become convertible into cash, assets, property or securities (other than capital
stock of the Company), no adjustment need be made thereafter as to the cash,
assets, property or such securities. Interest will not accrue on the cash.

         (k)  Whenever the Conversion Price is adjusted as herein provided, the
Company shall promptly file with the Trustee and any conversion agent other than
the Trustee an Officers' Certificate setting forth the Conversion Price after
such adjustment and setting forth a brief statement of the facts requiring such
adjustment. Unless and until a Responsible Officer of the Trustee shall have
received such Officers' Certificate, the Trustee shall not be deemed to have
knowledge of any adjustment of the Conversion Price and may assume that the last
Conversion Price of which it has knowledge is still in effect. Promptly after
delivery of such certificate, the Company shall prepare a notice of such
adjustment of the Conversion Price setting forth the adjusted Conversion Price
and the date on which each adjustment becomes effective and shall mail such
notice of such adjustment of the Conversion Price to the holder of each Note at
his last address appearing on the Note register provided for in Section 2.5 of
this Indenture, within twenty (20) days after execution thereof. Failure to
deliver such notice shall not affect the legality or validity of any such
adjustment.

         (l)  In any case in which this Section 15.5 provides that an adjustment
shall become effective immediately after (1) a record date or Record Date for an
event, (2) the date fixed for the determination of stockholders entitled to
receive a dividend or distribution pursuant to Section 15.5(a), (3) a date fixed
for the determination of stockholders entitled to receive rights or warrants
pursuant to Section 15.5(b), (4) the Expiration Time for any tender or exchange
offer pursuant to Section 15.5(f), or (5) the Offer Expiration Time for a tender
or exchange offer pursuant to Section 15.5(g) (each a "Determination Date"), the
Company may elect to defer until the occurrence of the relevant Adjustment Event
(as hereinafter defined) (x) issuing to the holder of any Note converted after
such Determination Date and before the occurrence of such Adjustment Event, the
additional shares of Common Stock or other securities issuable upon such
conversion by reason of the adjustment required by such Adjustment Event over
and above the Common Stock issuable upon such conversion before giving effect to
such adjustment and (y) paying to such holder any amount in cash in lieu of any
fraction pursuant to Section 15.3. For purposes of this Section 15.5(l), the
term "Adjustment Event" shall mean:

               (a) in any case referred to in clause (1) hereof, the occurrence
          of such event,

               (b) in any case referred to in clause (2) hereof, the date any
          such dividend or distribution is paid or made,

               (c) in any case referred to in clause (3) hereof, the date of
          expiration of such rights or warrants, and

                                      -63-
<PAGE>

               (d) in any case referred to in clause (4) or clause (5) hereof,
          the date a sale or exchange of Common Stock pursuant to such tender or
          exchange offer is consummated and becomes irrevocable.

          (m)  For purposes of this Section 15.5, the number of shares of Common
Stock at any time outstanding shall not include shares held in the treasury of
the Company but shall include shares issuable in respect of scrip certificates
issued in lieu of fractions of shares of Common Stock. The Company will not pay
any dividend or make any distribution on shares of Common Stock held in the
treasury of the Company.

     Section 15.6.  Effect of Reclassification, Consolidation, Merger or Sale.
                    ---------------------------------------------------------
If any of the following events occur, namely (i) any reclassification or change
of the outstanding shares of Common Stock (other than a subdivision or
combination to which Section 15.5(c) applies), (ii) any consolidation, merger or
combination of the Company with another Person as a result of which holders of
Common Stock shall be entitled to receive stock, other securities or other
property or assets (including cash) with respect to or in exchange for such
Common Stock, or (iii) any sale or conveyance of all or substantially all of the
properties and assets of the Company to any other Person as a result of which
holders of Common Stock shall be entitled to receive stock, other securities or
other property or assets (including cash) with respect to or in exchange for
such Common Stock, then the Company or the successor or purchasing Person, as
the case may be, shall execute with the Trustee a supplemental indenture (which
shall comply with the Trust Indenture Act as in force at the date of execution
of such supplemental indenture) providing that each Note shall be convertible
into the kind and amount of shares of stock, other securities or other property
or assets (including cash) receivable upon such reclassification, change,
consolidation, merger, combination, sale or conveyance by a holder of a number
of shares of Common Stock issuable upon conversion of such Notes (assuming, for
such purposes, a sufficient number of authorized shares of Common Stock are
available to convert all such Notes) immediately prior to such reclassification,
change, consolidation, merger, combination, sale or conveyance assuming such
holder of Common Stock did not exercise his rights of election, if any, as to
the kind or amount of stock, other securities or other property or assets
(including cash) receivable upon such reclassification, change, consolidation,
merger, combination, sale or conveyance (provided that, if the kind or amount of
stock, other securities or other property or assets (including cash) receivable
upon such reclassification, change, consolidation, merger, combination, sale or
conveyance is not the same for each share of Common Stock in respect of which
such rights of election shall not have been exercised ("non-electing share"),
then for the purposes of this Section 15.6 the kind and amount of stock, other
securities or other property or assets (including cash) receivable upon such
reclassification, change, consolidation, merger, combination, sale or conveyance
for each non-electing share shall be deemed to be the kind and amount so
receivable per share by a plurality of the non-electing shares). Such
supplemental indenture shall provide for adjustments which shall be as nearly
equivalent as may be practicable to the adjustments provided for in this Article
Fifteen (which will include separate conversion prices and adjustments with
respect thereto in the event the Notes become convertible into more than one
class of common stock of the Company (or its successor as obligor on the
Notes)).

     The Company shall cause notice of the execution of such supplemental
indenture to be mailed to each holder of Notes, at its address appearing on the
Note register provided for in Section 2.5 of this Indenture, within twenty (20)
days after execution thereof.  Failure to deliver such notice shall not affect
the legality or validity of such supplemental indenture.

     The above provisions of this Section shall similarly apply to successive
reclassifications, changes, consolidations, mergers, combinations, sales and
conveyances.

                                      -64-
<PAGE>

     If this Section 15.6 applies to any event or occurrence, Section 15.5 shall
not apply.

     Section 15.7.  Special Provisions Applicable to Tracking Stock or Similar
                    ----------------------------------------------------------
Arrangement.  In the event that the Company effects a tracking stock or similar
-----------
arrangement the terms of which track the economic performance of one or more
(but not all) of the Company's line or lines of business or business unit or
units by distributing common stock on its Common Stock or reclassifying its
Common Stock, then the Company shall execute with the Trustee a supplemental
indenture (which shall comply with the Trust Indenture Act as in force at the
date of execution of such supplemental indenture) providing:

          (a)  that immediately following the effective date of such
reclassification or the record date for such distribution, as the case may be,
the Notes shall be convertible into, (i) in the case of a reclassification of
the Common Stock, the shares of each class or series of common stock into which
the Common Stock has been reclassified, and (ii) in the case of a stock
distribution, the same number of shares of Common Stock into which the Notes
were convertible immediately prior to such distribution plus the shares of other
common stock that would have been distributed on those shares of Common Stock if
such shares of Common Stock had been outstanding on the record date for such
distribution;

          (b)  that a Fundamental Change under Section 3.5(g)(iii) will be
deemed to occur in the event of any transaction or event in connection with
which all or substantially all of each class of common stock into which the
Notes are convertible shall be exchanged for, converted into, acquired for or
constitute solely the right to receive consideration (whether by means of an
exchange offer, liquidation, tender offer, consolidation, merger, combination,
reclassification, recapitalization or otherwise) all or substantially all of
which does not consist of common stock of the Company (or common stock of the
successor to the Company as obligor on the Notes) which is (or, upon
consummation of or immediately following such transaction or event, which will
be) listed on a United States national securities exchange or approved for
quotation on the Nasdaq National Market or any similar United States system of
automated dissemination of quotation of securities prices;

          (c)  that in the event of any transaction or event in connection with
which all or substantially all of any class of common stock into which the Notes
are convertible (but not all of such classes) shall be exchanged for, converted
into, acquired for or constitute solely the right to receive consideration
(whether by means of an exchange offer, liquidation, tender offer,
consolidation, merger, combination, reclassification, redemption or otherwise)
which is not all or substantially all common stock of the Company (or common
stock of the successor obligor to the Company on the Notes) listed on (or that
will be listed immediately after the transaction or event on) a United States
national securities exchange or approved for quotation on the Nasdaq National
Market or any similar United States system of automated dissemination or
quotations of securities prices (an "Adjustment Occurrence"), then (i) such
Adjustment Occurrence shall not be a Fundamental Change for purposes of Section
3.5(g)(iii), but instead (ii) the Notes shall no longer be convertible into such
class of common stock (or any associated property, assets or other securities
(other than shares of another class of common stock of the Company (or its
successor obligor on the Notes)) that was previously receivable upon conversion
of the Notes as a result of any reclassification change or other event with
respect to shares of such class of common stock) (the "Deemed Distributed
Property"), but instead the conversion price or conversion prices (which may be
appropriately allocated to a portion of the principal amount of each Note for
purposes of determining the number of shares issuable upon conversion) for
purposes of calculating the number of shares of the other class or classes of
common stock (and any associated property, assets and other securities
receivable upon conversion of the Notes as a result of any reclassification,
change or other event with respect to shares of such class of common stock,
other than shares of common stock of the Company (or its successor obligor on
the Notes) for which a separate conversion

                                      -65-
<PAGE>

price or conversion prices and provisions for adjustments with respect thereto
have been established pursuant to this Article Fifteen ("Associated Property"))
shall be reduced so that the aggregate fair market value (determined immediately
following the Adjustment Occurrence) of the shares of such class or classes of
common stock receivable upon conversion of a Note (together with Associated
Property) is equal to the aggregate fair market value of the shares of common
stock (together with Associated Property) receivable upon conversion of a Note
immediately prior to the Adjustment Occurrence (with, in any case where the
Notes continue to be convertible into more than one class of common stock and,
accordingly, more than one conversion price applies, the conversion price
adjustments appropriately weighted to reflect the relative aggregate values of
common stock and Associated Property applicable to each class of common stock
into which a Note continues to be convertible, on the one hand, and Deemed
Distributed Property, on the other hand);

          (d)  that upon any such Adjustment Occurrence, the Company shall
execute with the Trustee an additional supplemental indenture (which shall
comply with the Trust Indenture Act as in force at the date of execution of such
supplemental indenture) to appropriately reflect the modifications to the
conversion price and the conversion privileges applicable to the Notes and the
Fundamental Change provisions set forth in Section 3.5(g)(iii) of the Indenture
as a result of such Adjustment Occurrence;

          (e)  appropriate modifications to the form of Note set forth as
Exhibit A to this Indenture to account for any modifications to Conversion
---------
Price, conversion privileges and Fundamental Change definitions and such other
appropriate modifications to the form of Note to account for the class or
classes of common stock that result from such reclassification or stock
dividend;

          (f)  appropriate modifications to the conversion privilege of the
Notes to provide for the fact that the Notes have become convertible into more
than a single class of common stock (including clarification that Sections 15.9
and 15.11 of the Indenture shall apply to each such class of common stock), as
well as modification to the Conversion Price (which may be appropriately
allocated to a portion of the principal amount of each Note for purposes of
determining the shares issuable upon conversion) to provide for appropriate
conversion prices with respect to the shares of each class of Common Stock
receivable upon conversion of the Notes as a result of such reclassification or
stock distribution, as the case may be, with such conversion prices to be
subject to adjustment upon the occurrence of certain events affecting each such
class or classes of common stock, as the case may be, on terms as nearly
equivalent as may be practicable to the adjustments provided for in this Article
Fifteen (including Sections 15.5 and 15.6 and this Section 15.7); and

          (g)  such other modifications to the provisions of the Indenture as
the Board of Directors of the Company determines are consistent with the intent
of this Section 15.7, provided that such modifications are not adverse in any
material respects to the holders of the Notes and the Board shall have reached
this determination.

     The Company shall cause notice of the execution of such supplemental
indenture (and any supplemental indenture executed as contemplated by Section
15.7(d) above) to be mailed to each holder of Notes, at its address appearing on
the Note register provided for in Section 2.5 of this Indenture, within twenty
(20) days after execution thereof.  Failure to deliver such notice shall not
affect the legality or validity of such supplemental indenture.  Such notice
shall include (i)  a description of the substantive provisions of the
supplemental indenture and (ii) a statement that such supplemental indenture is
in the form contemplated by this Section 15.7.

                                      -66-
<PAGE>

     The above provisions of this Section shall similarly apply to successive
reclassifications and stock distributions to effect a tracking stock or similar
arrangement.

     If this Section 15.7 applies to a reclassification or stock distribution to
effect a tracking stock or similar arrangement or to a transaction or event
described in Section 15.7(c), neither Section 15.5 nor 15.6 shall apply to such
reclassification, distribution or transaction or event.

     The Company shall make such further modifications to the provisions of the
Indenture as are consistent with the intent of this Section 15.7, in addition to
those set forth above in this Section 15.7, as determined in good faith by the
Company and evidenced by a resolution of the Board of Directors of the Company
as are necessary and appropriate to protect the interests of the holders of
Notes.

     Section 15.8.  Taxes on Shares Issued.  The issue of stock certificates on
                    ----------------------
conversions of Notes shall be made without charge to the converting Noteholder
for any tax in respect of the issue thereof. The Company shall not, however, be
required to pay any tax which may be payable in respect of any transfer involved
in the issue and delivery of stock in any name other than that of the holder of
any Note converted, and the Company shall not be required to issue or deliver
any such stock certificate unless and until the Person or Persons requesting the
issue thereof shall have paid to the Company the amount of such tax or shall
have established to the satisfaction of the Company that such tax has been paid.

     Section 15.9.  Reservation of Shares; Shares to be Fully Paid; Compliance
                    ----------------------------------------------------------
with Governmental Requirements; Listing of Common Stock. The Company shall
-------------------------------------------------------
provide, free from preemptive rights, out of its authorized but unissued shares
or shares held in treasury, sufficient shares of Common Stock to provide for the
conversion of the Notes from time to time as such Notes are presented for
conversion.

     Before taking any action which would cause an adjustment reducing the
Conversion Price below the then par value, if any, of the shares of Common Stock
issuable upon conversion of the Notes, the Company will take all corporate
action which may, in the opinion of its counsel, be necessary in order that the
Company may validly and legally issue shares of such Common Stock at such
adjusted Conversion Price.

     The Company covenants that all shares of Common Stock which may be issued
upon conversion of Notes will upon issue be fully paid and non-assessable by the
Company and free from all taxes, liens and charges with respect to the issue
thereof.

     If any shares required to be reserved for purposes of conversion of Notes
hereunder require registration with or approval of any governmental authority
under any Federal or State law, before such shares may be issued upon
conversion, the Company will in good faith and as expeditiously as possible
endeavor to cause such shares to be duly registered or approved, as the case may
be.

     The Company further covenants that, if at any time the Common Stock shall
be listed on the Nasdaq National Market or any other national securities
exchange or automated quotation system, the Company will, if permitted by the
rules of such exchange or automated quotation system, list and keep listed, so
long as the Common Stock shall be so listed on such exchange or automated
quotation system, all Common Stock issuable upon conversion of the Note;
provided, however, that, if the rules of such exchange or automated quotation
system permit the Company to defer the listing of such Common Stock until the
first conversion of the Notes into Common Stock in accordance with the
provisions of this Indenture, the Company covenants to

                                      -67-
<PAGE>

list such Common Stock issuable upon conversion of the Notes in accordance with
the requirements of such exchange or automated quotation system at such time.

         Section 15.10.  Responsibility of Trustee.  The Trustee and any other
                         -------------------------
conversion agent shall not at any time be under any duty or responsibility to
any holder of Notes to determine the Conversion Price or whether any facts exist
which may require any adjustment of the Conversion Price, or with respect to the
nature or extent or calculation of any such adjustment when made, or with
respect to the method employed, or herein or in any supplemental indenture
provided to be employed, in making the same. The Trustee and any other
conversion agent shall not be accountable with respect to the validity or value
(or the kind or amount) of any shares of Common Stock, or of any securities or
property, which may at any time be issued or delivered upon the conversion of
any Note; and the Trustee and any other conversion agent make no representations
with respect thereto. Neither the Trustee nor any conversion agent shall be
responsible for any failure of the Company to issue, transfer or deliver any
shares of Common Stock or stock certificates or other securities or property or
cash upon the surrender of any Note for the purpose of conversion or to comply
with any of the duties, responsibilities or covenants of the Company contained
in this Article Fifteen. Without limiting the generality of the foregoing,
neither the Trustee nor any conversion agent shall be under any responsibility
to determine the correctness of any provisions contained in any supplemental
indenture entered into pursuant to Section 15.6 or Section 15.7 relating either
to the kind or amount of shares of stock or securities or property (including
cash) receivable by Noteholders upon the conversion of their Notes after any
event referred to in such Section 15.6 or Section 15.7 or to any adjustment to
be made with respect thereto, but, subject to the provisions of Section 8.1, may
accept as conclusive evidence of the correctness of any such provisions, and
shall be protected in relying upon, the Officers' Certificate (which the Company
shall be obligated to file with the Trustee prior to the execution of any such
supplemental indenture) with respect thereto.

     Section 15.11.  Notice to Holders Prior to Certain Actions.  In case:
                     ------------------------------------------

           (a)  the Company shall declare a dividend (or any other distribution)
on its Common Stock that would require an adjustment in the Conversion Price
pursuant to Section 15.5 or to which Section 15.7 would apply; or

           (b)  the Company shall authorize the granting to the holders of all
or substantially all of its Common Stock of rights or warrants to subscribe for
or purchase any share of any class or any other rights or warrants; or

           (c)  of any reclassification or reorganization of the Common Stock of
the Company (other than a subdivision or combination of its outstanding Common
Stock, or a change in par value, or from par value to no par value, or from no
par value to par value), or of any consolidation or merger to which the Company
is a party and for which approval of any stockholders of the Company is
required, or of the sale or transfer of all or substantially all of the assets
of the Company or any Significant Subsidiary; or

           (d)  of the voluntary or involuntary dissolution, liquidation or
winding up of the Company or any Significant Subsidiary;

the Company shall cause to be filed with the Trustee and to be mailed to each
holder of Notes at his address appearing on the Note register provided for in
Section 2.5 of this Indenture, as promptly as possible but in any event at least
ten (10) days prior to the applicable date hereinafter specified, a notice
stating (x) the date on which a record is to be taken for the purpose of such
dividend,

                                      -68-
<PAGE>

distribution or rights or warrants, or, if a record is not to be taken, the date
as of which the holders of Common Stock of record to be entitled to such
dividend, distribution or rights are to be determined, or (y) the date on which
such reclassification, consolidation, merger, sale, transfer, dissolution,
liquidation or winding up is expected to become effective or occur, and the date
as of which it is expected that holders of Common Stock of record shall be
entitled to exchange their Common Stock for securities or other property
deliverable upon such reclassification, consolidation, merger, sale, transfer,
dissolution, liquidation or winding up. Failure to give such notice, or any
defect therein, shall not affect the legality or validity of such dividend,
distribution, reclassification, consolidation, merger, sale, transfer,
dissolution, liquidation or winding up.

                                ARTICLE Sixteen

                            MISCELLANEOUS PROVISIONS

     Section 16.1.  Provisions Binding on Company's Successors. All the
                    ------------------------------------------
covenants, stipulations, promises and agreements by the Company contained in
this Indenture shall bind its successors and assigns whether so expressed or
not.

     Section 16.2.  Official Acts by Successor Corporation. Any act or
                    --------------------------------------
proceeding by any provision of this Indenture authorized or required to be done
or performed by any board, committee or officer of the Company shall and may be
done and performed with like force and effect by the like board, committee or
officer of any Person that shall at the time be the lawful sole successor of the
Company.

     Section 16.3.  Addresses for Notices, Etc. Any notice or demand which by
                    --------------------------
any provision of this Indenture is required or permitted to be given or served
by the Trustee or by the holders of Notes on the Company shall be deemed to have
been sufficiently given or made, for all purposes, if given or served by being
deposited postage prepaid by registered or certified mail in a post office
letter box addressed (until another address is filed by the Company with the
Trustee) to At Home Corporation, 450 Broadway, Redwood City, California 94063,
Attention: Treasurer. Any notice, direction, request or demand hereunder to or
upon the Trustee shall be deemed to have been sufficiently given or made, for
all purposes, if given or served by being deposited, postage prepaid, by
registered or certified mail in a post office letter box addressed to the
Corporate Trust Office, which office is, at the date as of which this Indenture
is dated, located at 633 West 5th Street, 12th Floor, Los Angeles, California
90071, Attention: Corporate Trust Department (At Home Corporation, 4%
Convertible Subordinated Notes due 2006).

     The Trustee, by notice to the Company, may designate additional or
different addresses for subsequent notices or communications.

     Any notice or communication mailed to a Noteholder shall be mailed to him
by first class mail, postage prepaid, at his address as it appears on the Note
register and shall be sufficiently given to him if so mailed within the time
prescribed.

     Failure to mail a notice or communication to a Noteholder or any defect in
it shall not affect its sufficiency with respect to other Noteholders.  If a
notice or communication is mailed in the manner provided above, it is duly
given, whether or not the addressee receives it.

     Section 16.4.  Governing Law. This Indenture and each Note shall be deemed
                    -------------
to be a contract made under the laws of the State of New York, and for all
purposes shall be construed in accordance with the laws of the State of New
York, without regard to the conflict of laws provisions thereof.

                                      -69-
<PAGE>

     Section 16.5.  Evidence of Compliance with Conditions Precedent;
                    ------------------------------------------------
Certificates to Trustee. Upon any application or demand by the Company to the
-----------------------
Trustee to take any action under any of the provisions of this Indenture, the
Company shall furnish to the Trustee an Officers' Certificate stating that all
conditions precedent, if any, provided for in this Indenture relating to the
proposed action have been complied with, and an Opinion of Counsel stating that,
in the opinion of such counsel, all such conditions precedent have been complied
with.

     Each certificate or opinion provided for in this Indenture and delivered to
the Trustee with respect to compliance with a condition or covenant provided for
in this Indenture shall include: (1) a statement that the person making such
certificate or opinion has read such covenant or condition; (2) a brief
statement as to the nature and scope of the examination or investigation upon
which the statement or opinion contained in such certificate or opinion is
based; (3) a statement that, in the opinion of such person, he has made such
examination or investigation as is necessary to enable him to express an
informed opinion as to whether or not such covenant or condition has been
complied with; and (4) a statement as to whether or not, in the opinion of such
person, such condition or covenant has been complied with.

     Section 16.6.  Legal Holidays.  In any case in which the date of maturity
                    --------------
of interest on or principal of the Notes or the date fixed for redemption of any
Note will not be a Business Day, then payment of such interest on or principal
of the Notes need not be made on such date, but may be made on the next
succeeding Business Day with the same force and effect as if made on the date of
maturity or the date fixed for redemption, and no interest shall accrue for the
period from and after such date.

     Section 16.7.  Trust Indenture Act. This Indenture is hereby made subject
                    -------------------
to, and shall be governed by, the provisions of the Trust Indenture Act required
to be part of and to govern indentures qualified under the Trust Indenture Act;
provided, however, that, unless otherwise required by law, notwithstanding the
foregoing, this Indenture and the Notes issued hereunder shall not be subject to
the provisions of subsections (a)(1), (a)(2), and (a)(3) of Section 314 of the
Trust Indenture Act as now in effect or as hereafter amended or modified;
provided further that this Section 16.7 shall not require this Indenture or the
Trustee to be qualified under the Trust Indenture Act prior to the time such
qualification is in fact required under the terms of the Trust Indenture Act,
nor shall it constitute any admission or acknowledgment by any party to the
Indenture that any such qualification is required prior to the time such
qualification is in fact required under the terms of the Trust Indenture Act. If
any provision hereof limits, qualifies or conflicts with another provision
hereof which is required to be included in an indenture qualified under the
Trust Indenture Act, such required provision shall control.

     Section 16.8.  No Security Interest Created. Nothing in this Indenture or
                    ----------------------------
in the Notes, expressed or implied, shall be construed to constitute a security
interest under the Uniform Commercial Code or similar legislation, as now or
hereafter enacted and in effect, in any jurisdiction in which property of the
Company or its subsidiaries is located.

     Section 16.9.  Benefits of Indenture. Nothing in this Indenture or in the
                    ---------------------
Notes, express or implied, shall give to any Person, other than the parties
hereto, any paying agent, any authenticating agent, any Note registrar and their
successors hereunder, the holders of Notes and the holders of Senior
Indebtedness, any benefit or any legal or equitable right, remedy or claim under
this Indenture.

     Section 16.10.  Table of Contents, Headings, Etc. The table of contents and
                     --------------------------------
the titles and headings of the articles and Sections of this Indenture have been
inserted for convenience of reference only, are not to be considered a part
hereof, and shall in no way modify or restrict any of the terms or provisions
hereof.

                                      -70-
<PAGE>

     Section 16.11.  Authenticating Agent. The Trustee may appoint an
                     --------------------
authenticating agent that shall be authorized to act on its behalf, and subject
to its direction, in the authentication and delivery of Notes in connection with
the original issuance thereof and transfers and exchanges of Notes hereunder,
including under Sections 2.4, 2.5, 2.6, 2.7, 3.3 and 3.5, as fully to all
intents and purposes as though the authenticating agent had been expressly
authorized by this Indenture and those Sections to authenticate and deliver
Notes. For all purposes of this Indenture, the authentication and delivery of
Notes by the authenticating agent shall be deemed to be authentication and
delivery of such Notes "by the Trustee" and a certificate of authentication
executed on behalf of the Trustee by an authenticating agent shall be deemed to
satisfy any requirement hereunder or in the Notes for the Trustee's certificate
of authentication. Such authenticating agent shall at all times be a Person
eligible to serve as trustee hereunder pursuant to Section 8.9.

     Any corporation into which any authenticating agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, consolidation or conversion to which any authenticating agent
shall be a party, or any corporation succeeding to the corporate trust business
of any authenticating agent, shall be the successor of the authenticating agent
hereunder, if such successor corporation is otherwise eligible under this
Section 16.11, without the execution or filing of any paper or any further act
on the part of the parties hereto or the authenticating agent or such successor
corporation.

     Any authenticating agent may at any time resign by giving written notice of
resignation to the Trustee and to the Company.  The Trustee may at any time
terminate the agency of any authenticating agent by giving written notice of
termination to such authenticating agent and to the Company.  Upon receiving
such a notice of resignation or upon such a termination, or in case at any time
any authenticating agent shall cease to be eligible under this Section, the
Trustee shall either promptly appoint a successor authenticating agent or itself
assume the duties and obligations of the former authenticating agent under this
Indenture and, upon such appointment of a successor authenticating agent, if
made, shall give written notice of such appointment of a successor
authenticating agent to the Company and shall mail notice of such appointment of
a successor authenticating agent to all holders of Notes as the names and
addresses of such holders appear on the Note register.

     The Company agrees to pay to the authenticating agent from time to time
such reasonable compensation for its services as shall be agreed upon in writing
between the Company and the authenticating agent.

     The provisions of Sections 8.2, 8.3, 8.4, 9.3 and this Section 16.11 shall
be applicable to any authenticating agent.


    Section 16.12.  Execution in Counterparts. This Indenture may be executed in
                    -------------------------
any number of counterparts, each of which shall be an original, but such
counterparts shall together constitute but one and the same instrument.

     Section 16.13.  Severability. In case any provision in this Indenture or in
                     ------------
the Notes shall be invalid, illegal or unenforceable, then (to the extent
permitted by law) the validity, legality and enforceability of the remaining
provisions shall not in any way be affected or impaired thereby.

                                      -71-
<PAGE>

     State Street Bank and Trust Company of California, N.A. hereby accepts the
trusts in this Indenture declared and provided, upon the terms and conditions
herein above set forth.

     IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be
duly executed.

                                    AT HOME CORPORATION


                                    By: /s/ Kenneth A. Goldman
                                       -------------------------------------
                                    Name:  Kenneth A. Goldman
                                    Title: Senior Vice President and Chief
                                           Financial Officer

                                    STATE STREET BANK AND TRUST COMPANY
                                    OF CALIFORNIA, N.A.,
                                    as Trustee


                                    By: /s/ Mark Henson
                                       -------------------------------------
                                    Name:  Mark Henson
                                    Title: Assistant Vice President
<PAGE>

                                   EXHIBIT A

     For Global Note only: UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (55 WATER STREET, NEW YORK, NEW
YORK) (THE "DEPOSITARY", WHICH TERM INCLUDES ANY SUCCESSOR DEPOSITARY FOR THE
CERTIFICATES) TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE
OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO.
OR IN SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITARY (AND ANY PAYMENT HEREIN IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY
AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY), ANY
TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.

     THE NOTE EVIDENCED HEREBY HAS NOT BEEN REGISTERED UNDER THE UNITED STATES
SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE
SECURITIES LAWS, AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED
STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS EXCEPT AS SET FORTH
IN THE FOLLOWING SENTENCE.  BY ITS ACQUISITION HEREOF, THE HOLDER (1) REPRESENTS
THAT (A) IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER
THE SECURITIES ACT) OR (B) IT IS AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS
DEFINED IN RULE 501(A)(1), (2), (3) OR (7) UNDER THE SECURITIES ACT)
("INSTITUTIONAL ACCREDITED INVESTOR"); (2) AGREES THAT IT WILL NOT, PRIOR TO
EXPIRATION OF THE HOLDING PERIOD APPLICABLE TO SALES OF THE NOTE EVIDENCED
HEREBY UNDER RULE 144(K) UNDER THE SECURITIES ACT (OR ANY SUCCESSOR PROVISION),
RESELL OR OTHERWISE TRANSFER THE NOTE EVIDENCED HEREBY OR THE COMMON STOCK
ISSUABLE UPON CONVERSION OF SUCH NOTE EXCEPT (A) TO AT HOME CORPORATION OR ANY
SUBSIDIARY THEREOF, (B) INSIDE THE UNITED STATES TO A QUALIFIED INSTITUTIONAL
BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) INSIDE THE
UNITED STATES TO AN INSTITUTIONAL ACCREDITED INVESTOR THAT, PRIOR TO SUCH
TRANSFER, FURNISHES TO STATE STREET BANK AND TRUST COMPANY OF CALIFORNIA, N.A.,
AS TRUSTEE (OR A SUCCESSOR TRUSTEE, AS APPLICABLE), A SIGNED LETTER CONTAINING
CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER
OF THE NOTE EVIDENCED HEREBY (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM SUCH
TRUSTEE OR A SUCCESSOR TRUSTEE, AS APPLICABLE), (D) OUTSIDE THE UNITED STATES IN
COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT, (E) PURSUANT TO THE EXEMPTION
FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT (IF AVAILABLE)
OR (F) PURSUANT TO A REGISTRATION STATEMENT WHICH HAS BEEN DECLARED EFFECTIVE
UNDER THE SECURITIES ACT (AND WHICH CONTINUES TO BE EFFECTIVE AT THE TIME OF
SUCH TRANSFER); (3) PRIOR TO SUCH TRANSFER (OTHER THAN A TRANSFER PURSUANT TO
CLAUSE (2)(F) ABOVE), IT WILL FURNISH TO STATE STREET BANK AND TRUST COMPANY OF
CALIFORNIA, N.A., AS TRUSTEE (OR A SUCCESSOR TRUSTEE, AS APPLICABLE, SUCH
CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS THE TRUSTEE MAY
REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN
EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION
<PAGE>

REQUIREMENTS OF THE SECURITIES ACT; AND (4) AGREES THAT IT WILL DELIVER TO EACH
PERSON TO WHOM THE NOTE EVIDENCED HEREBY IS TRANSFERRED A NOTICE SUBSTANTIALLY
TO THE EFFECT OF THIS LEGEND.  IN CONNECTION WITH ANY TRANSFER OF THE NOTE
EVIDENCED HEREBY PRIOR TO THE EXPIRATION OF THE HOLDING PERIOD APPLICABLE TO
SALES OF THE NOTE EVIDENCED HEREBY UNDER RULE 144(K) UNDER THE SECURITIES ACT
(OR ANY SUCCESSOR PROVISION), THE HOLDER MUST CHECK THE APPROPRIATE BOX SET
FORTH ON THE REVERSE HEREOF RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT
THIS CERTIFICATE TO STATE STREET BANK AND TRUST COMPANY OF CALIFORNIA, N.A., AS
TRUSTEE (OR A SUCCESSOR TRUSTEE, AS APPLICABLE).  IF THE PROPOSED TRANSFEREE IS
AN INSTITUTIONAL ACCREDITED INVESTOR OR IS A PURCHASER WHO IS NOT A U.S. PERSON,
THE HOLDER MUST, PRIOR TO SUCH TRANSFER, FURNISH TO STATE STREET BANK AND TRUST
COMPANY OF CALIFORNIA, N.A., AS TRUSTEE (OR A SUCCESSOR TRUSTEE, AS APPLICABLE),
SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS SUCH TRUSTEE MAY
REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN
EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT.  THIS LEGEND WILL BE REMOVED UPON THE
EARLIER OF THE TRANSFER OF THE NOTE EVIDENCED HEREBY PURSUANT TO CLAUSE (2)(F)
ABOVE OR UPON ANY TRANSFER OF THE NOTE EVIDENCED HEREBY UNDER RULE 144(K) UNDER
THE SECURITIES ACT (OR ANY SUCCESSOR PROVISION).  AS USED HEREIN, THE TERMS
"UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS GIVEN TO THEM BY
REGULATION S UNDER THE SECURITIES ACT.


                                      A-2
<PAGE>

                              AT HOME CORPORATION

                   4% CONVERTIBLE SUBORDINATED NOTE DUE 2006

                                                       CUSIP:___________________

No. __________                                              $___________________

     At Home Corporation, a corporation duly organized and validly existing
under the laws of the State of Delaware (herein called the "Company", which term
includes any successor corporation under the Indenture referred to on the
reverse hereof), for value received hereby promises to pay to
________________________, or registered assigns, the principal sum of
_________________ ($___________) (which, taken together with all principal
amounts of all other outstanding Notes, shall not exceed $500,000,000 (or
$575,000,000 if the Over-allotment Option is exercised in full) in the aggregate
at any time) on December 15, 2006, at the office or agency of the Company
maintained for that purpose in accordance with the terms of the Indenture, in
such coin or currency of the United States of America as at the time of payment
shall be legal tender for the payment of public and private debts, and to pay
interest, semi-annually on June 15 and December 15 of each year, commencing June
15, 2000, on said principal sum at said office or agency, in like coin or
currency, at the rate per annum of 4%, from June 15 or December 15, as the case
may be, next preceding the date of this Note to which interest has been paid or
duly provided for, unless the date hereof is a date to which interest has been
paid or duly provided for, in which case from the date of this Note, or unless
no interest has been paid or duly provided for on the Notes, in which case from
December 13, 1999, until payment of said principal sum has been made or duly
provided for.  Notwithstanding the foregoing, if the date hereof is after any
June 1 or December 1, as the case may be, and before the following June 15 or
December 15, this Note shall bear interest from such June 15 or December 15;
provided, however, that if the Company shall default in the payment of interest
--------  -------
due on such June 15 or December 15, then this Note shall bear interest from the
next preceding June 15 or December 15 to which interest has been paid or duly
provided for or, if no interest has been paid or duly provided for on such Note,
from December 13, 1999.  Except as otherwise provided in the Indenture, the
interest payable on the Note pursuant to the Indenture on any June 15 or
December 15 will be paid to the Person entitled thereto as it appears in the
Note register at the close of business on the record date, which shall be the
June 1 or December 1 (whether or not a Business Day) next preceding such June 15
or December 15, as provided in the Indenture; provided, however, that any such
interest not punctually paid or duly provided for shall be payable as provided
in the Indenture.  Interest may, at the option of the Company, be paid either
(i) by check mailed to the registered address of such Person (provided that the
holder of Notes with an aggregate principal amount in excess of $2,000,000
shall, at the written election of such holder, be paid by wire transfer of
immediately available funds) or (ii) by transfer to an account maintained by
such Person located in the United States; provided, however, that payments to
                                          --------  -------
the Depositary will be made by wire transfer of immediately available funds to
the account of the Depositary or its nominee.

     Reference is made to the further provisions of this Note set forth on the
reverse hereof, including, without limitation, provisions subordinating the
payment of principal of and premium, if any, and interest on the Notes to the
prior payment in full of all Senior Indebtedness, as defined in the Indenture,
and provisions giving the holder of this Note the right to convert this Note
into Common Stock of the Company on the terms and subject to the limitations
referred to on the reverse hereof and as more fully specified in the Indenture.
Such further provisions shall for all purposes have the same effect as though
fully set forth at this place.


                                      A-3
<PAGE>

     This Note shall be deemed to be a contract made under the laws of the State
of New York, and for all purposes shall be construed in accordance with and
governed by the laws of the State of New York, without regard to principles of
conflicts of laws.

     This Note shall not be valid or become obligatory for any purpose until the
certificate of authentication hereon shall have been manually signed by the
Trustee or a duly authorized authenticating agent under the Indenture.

     IN WITNESS WHEREOF, the Company has caused this Note to be duly executed.

                                    AT HOME CORPORATION


                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

Attest:_________________________
Name:___________________________
Title:__________________________

Dated:_______________________

TRUSTEE'S CERTIFICATE OF AUTHENTICATION

This is one of the Notes described in the within-named Indenture.

STATE STREET BANK AND TRUST COMPANY OF CALIFORNIA, N.A., as Trustee


By:_____________________________
   Authorized Officer



                                      A-4
<PAGE>

                            FORM OF REVERSE OF NOTE

                              AT HOME CORPORATION

                   4% CONVERTIBLE SUBORDINATED NOTE DUE 2006

     This Note is one of a duly authorized issue of Notes of the Company,
designated as its 4% Convertible Subordinated Notes due 2006 (herein called the
"Notes"), limited to the aggregate principal amount of $500,000,000 (or up to
$575,000,000 if the Over-allotment Option is exercised in full) all issued or to
be issued under and pursuant to an Indenture dated as of December 1, 1999
(herein called the "Indenture"), between the Company and State Street Bank and
Trust Company of California, N.A., as trustee (herein called the "Trustee"), to
which Indenture and all indentures supplemental thereto reference is hereby made
for a description of the rights, limitations of rights, obligations, duties and
immunities thereunder of the Trustee, the Company and the holders of the Notes.

     In case an Event of Default (as defined in the Indenture) shall have
occurred and be continuing, the principal of, premium, if any, and accrued
interest (including Liquidated Damages (as defined in the Indenture), if any) on
all Notes may be declared by either the Trustee or the holders of not less than
25% in aggregate principal amount of the Notes then outstanding, and upon said
declaration shall become, due and payable, in the manner, with the effect and
subject to the conditions provided in the Indenture.

     The Indenture contains provisions permitting the Company and the Trustee,
with the consent of the holders of not less than a majority in aggregate
principal amount of the Notes at the time outstanding, to execute supplemental
indentures adding any provisions to or changing in any manner or eliminating any
of the provisions of the Indenture or of any supplemental indenture or modifying
in any manner the rights of the holders of the Notes; provided, however, that no
                                                      --------  -------
such supplemental indenture shall (i) extend the fixed maturity of any Note, or
reduce the rate or extend the time of payment of interest thereon, or reduce the
principal amount thereof or premium, if any, thereon, or reduce any amount
payable upon redemption thereof, or impair the right of any Noteholder to
institute suit for the payment thereof, or make the principal thereof or
interest or premium, if any, thereon payable in any coin or currency other than
that provided in the Notes, or modify the provisions of the Indenture with
respect to the subordination of the Notes in a manner adverse to the Noteholders
in any material respect, or change the obligation of the Company to redeem any
Note upon the happening of a Fundamental Change (as defined in the Indenture) in
a manner adverse to the holder of the Notes, or impair the right to convert the
Notes into Common Stock subject to the terms set forth in the Indenture,
including Section 15.6 thereof, without the consent of the holder of each Note
so affected or (ii) reduce the aforesaid percentage of Notes, the holders of
which are required to consent to any such supplemental indenture, without the
consent of the holders of all Notes then outstanding.  Subject to the provisions
of the Indenture, the holders of a majority in aggregate principal amount of the
Notes at the time outstanding may on behalf of the holders of all of the Notes
waive any past default or Event of Default under the Indenture and its
consequences except a default in the payment of interest (including Liquidated
Damages, if any) or any premium on, or the principal of, any of the Notes, or a
failure by the Company to convert any Notes into Common Stock of the Company, or
a default in the payment of the redemption price pursuant to Article Three of
the Indenture, or a default in respect of a covenant or provisions of the
Indenture which under Article Eleven of the Indenture cannot be modified without
the consent of the holders of each or all Notes then outstanding or affected
thereby.  Any such consent or waiver by the holder of this Note (unless revoked
as provided in the Indenture) shall be conclusive and binding upon such holder
and upon all future holders


                                      A-5
<PAGE>

and owners of this Note and any Notes which may be issued in exchange or
substitution hereof, irrespective of whether or not any notation thereof is made
upon this Note or such other Notes.

     The indebtedness evidenced by the Notes is, to the extent and in the manner
provided in the Indenture, expressly subordinated and subject in right of
payment to the prior payment in full of all Senior Indebtedness of the Company,
whether outstanding at the date of the Indenture or thereafter incurred, and
this Note is issued subject to the provisions of the Indenture with respect to
such subordination.  Each holder of this Note, by accepting the same, agrees to
and shall be bound by such provisions and authorizes the Trustee on its behalf
to take such action as may be necessary or appropriate to effectuate the
subordination so provided and appoints the Trustee his attorney-in-fact for such
purpose.

     No reference herein to the Indenture and no provision of this Note or of
the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and any premium and interest
(including Liquidated Damages, if any) on this Note at the place, at the
respective times, at the rate and in the coin or currency herein prescribed.

     Interest on the Notes shall be computed on the basis of a 360-day year of
twelve 30-day months.

     The Notes are issuable in fully registered form, without coupons, in
denominations of $1,000 principal amount and any integral multiple of $1,000.
At the office or agency of the Company referred to on the face hereof, and in
the manner and subject to the limitations provided in the Indenture, without
payment of any service charge but with payment of a sum sufficient to cover any
tax, assessment or other governmental charge that may be imposed in connection
with any registration or exchange of Notes, Notes may be exchanged for a like
aggregate principal amount of Notes of any other authorized denominations.

     The Notes will not be redeemable at the option of the Company prior to
December 20, 2002.  At any time on or after December 20, 2002, and prior to
maturity, the Notes may be redeemed at the option of the Company, in whole or in
part, upon mailing a notice of such redemption not less than 30 days but not
more than 60 days before the date fixed for redemption to the holders of Notes
at their last registered addresses, all as provided in the Indenture, at the
following optional redemption prices (expressed as percentages of the principal
amount), together in each case with accrued and unpaid interest (including
Liquidated Damages, if any) to, but excluding, the date fixed for redemption:
<TABLE>
<CAPTION>
Period                                                                          Redemption Price
------                                                                          ----------------
<S>                                                                             <C>
Beginning on December 20, 2002 and ending on December 14, 2003.........                 102.714%
Beginning on December 15, 2003 and ending on December 14, 2004.........                 102.036
Beginning on December 15, 2004 and ending on December 14, 2005.........                 101.357
Beginning on December 15, 2005 and ending on December 14, 2006.........                 100.679
</TABLE>

and 100% on December 15, 2006; provided, however, that if the date fixed for
redemption is on a June 15 or December 15, then the interest payable on such
date shall be paid to the holder of record on the preceding June 1 or December
1, respectively.

     The Company may not give notice of any redemption of the Notes if a default
in the payment of interest or premium, if any, on the Notes has occurred and is
continuing.

     The Notes are not subject to redemption through the operation of any
sinking fund.


                                      A-6
<PAGE>

     If a Fundamental Change occurs at any time prior to maturity of the Notes,
the Notes will be redeemable on the 30th day after notice thereof (the
"Repurchase Date") at the option of the holder of the Notes at a redemption
price equal to 100% of the principal amount thereof, together with accrued
interest to (but excluding) the date of redemption; provided, however, that, if
such Repurchase Date is a June 15 or December 15, the interest payable on such
date shall be paid to the holder of record of the Notes on the preceding June 1
or December 1, respectively.  The Notes will be redeemable in multiples of
$1,000 principal amount.  The Company shall mail to all holders of record of the
Notes a notice of the occurrence of a Fundamental Change and of the redemption
right arising as a result thereof on or before the 10th day after the occurrence
of such Fundamental Change.  For a Note to be so redeemed at the option of the
holder, the Company must receive at the office or agency of the Company
maintained for that purpose in accordance with the terms of the Indenture, such
Note with the form entitled "Option to Elect Repayment Upon a Fundamental
Change" on the reverse thereof duly completed, together with such Note, duly
endorsed for transfer, on or before the 30th day after the date of such notice
of a Fundamental Change (or if such 30th day is not a Business Day, the
immediately succeeding Business Day).

     Subject to the provisions of the Indenture, the holder hereof has the
right, at its option, at any time after the original issuance of any Notes
through the close of business on the final maturity date of the Notes, or, as to
all or any portion hereof called for redemption, prior to the close of business
on the Business Day immediately preceding the date fixed for redemption (unless
the Company shall default in payment due upon redemption thereof), to convert
the principal hereof or any portion of such principal which is $1,000 or an
integral multiple thereof into that number of shares of the Company's Common
Stock (as such shares shall be constituted at the date of conversion) obtained
by dividing the principal amount of this Note or portion thereof to be converted
by the Conversion Price of $56.52, as may adjusted from time to time as provided
in the Indenture, upon surrender of this Note, together with a conversion notice
as provided in the Indenture (the form entitled "Conversion Notice" on the
reverse hereof), to the Company at the office or agency of the Company
maintained for that purpose in accordance with the terms of the Indenture, or at
the option of such holder, the Corporate Trust Office, and, unless the shares
issuable on conversion are to be issued in the same name as this Note, duly
endorsed by, or accompanied by instruments of transfer in form satisfactory to
the Company duly executed by, the holder or by his duly authorized attorney.  No
adjustment in respect of interest on any Note converted or dividends on any
shares issued upon conversion of such Note will be made upon any conversion
except as set forth in the next sentence.  If this Note (or portion hereof) is
surrendered for conversion during the period from the close of business on any
record date for the payment of interest to the close of business on the Business
Day preceding the following interest payment date and either (x) has not been
called for redemption on a redemption date that occurs during such period or (y)
is not to be redeemed in connection with a Fundamental Change on a Repurchase
Date that occurs during such period, this Note (or portion hereof being
converted) must be accompanied by an amount, in New York Clearing House funds or
other funds acceptable to the Company, equal to the interest payable on such
interest payment date on the principal amount being converted; provided,
however, that no such payment shall be required if there shall exist at the time
of conversion a default in the payment of interest on the Notes.  No fractional
shares will be issued upon any conversion, but an adjustment and payment in cash
will be made, as provided in the Indenture, in respect of any fraction of a
share which would otherwise be issuable upon the surrender of any Note or Notes
for conversion.  A Note in respect of which a holder is exercising its right to
require redemption upon a Fundamental Change may be converted only if such
holder withdraws its election to exercise such right in accordance with the
terms of the Indenture.  Any Notes called for redemption, unless surrendered for
conversion by the holders thereof on or before the close of business on the
Business Day preceding the date fixed for redemption, may be deemed to be
redeemed from the holders of such Notes for an amount equal to the applicable
redemption price, together with accrued but unpaid interest (including
Liquidated Damages, if any) to (but excluding) the date fixed for redemption, by
one or more investment


                                      A-7
<PAGE>

banks or other purchasers who may agree with the Company (i) to purchase such
Notes from the holders thereof and convert them into shares of the Company's
Common Stock and (ii) to make payment for such Notes as aforesaid to the Trustee
in trust for the holders.

     Upon due presentment for registration of transfer of this Note at the
office or agency of the Company maintained for that purpose in accordance with
the terms of the Indenture, a new Note or Notes of authorized denominations for
an equal aggregate principal amount will be issued to the transferee in exchange
thereof; subject to the limitations provided in the Indenture, without charge
except for any tax, assessment or other governmental charge imposed in
connection therewith.

     The Company, the Trustee, any authenticating agent, any paying agent, any
conversion agent and any Note registrar may deem and treat the registered holder
hereof as the absolute owner of this Note (whether or not this Note shall be
overdue and notwithstanding any notation of ownership or other writing hereon
made by anyone other than the Company or any Note registrar) for the purpose of
receiving payment hereof, or on account hereof, for the conversion hereof and
for all other purposes, and neither the Company nor the Trustee nor any other
authenticating agent nor any paying agent nor other conversion agent nor any
Note registrar shall be affected by any notice to the contrary.  All payments
made to or upon the order of such registered holder shall, to the extent of the
sum or sums paid, satisfy and discharge liability for monies payable on this
Note.

     No recourse for the payment of the principal of or any premium or interest
on this Note, or for any claim based hereon or otherwise in respect hereof, and
no recourse under or upon any obligation, covenant or agreement of the Company
in the Indenture or any supplemental indenture or in any Note, or because of the
creation of any indebtedness represented thereby, shall be had against any
incorporator, stockholder, employee, agent, officer or director or subsidiary,
as such, past, present or future, of the Company or of any successor
corporation, either directly or through the Company or any successor
corporation, whether by virtue of any constitution, statute or rule of law or by
the enforcement of any assessment or penalty or otherwise, all such liability
being, by acceptance hereof and as part of the consideration for the issue
hereof, expressly waived and released.

     This Note shall be deemed to be a contract made under the laws of New York,
and for all purposes shall be construed in accordance with the laws of New York,
without regard to principles of conflicts of laws.

     Terms used in this Note and defined in the Indenture are used herein as
therein defined.


                                      A-8
<PAGE>

                                 ABBREVIATIONS

     The following abbreviations, when used in the inscription of the face of
this Note, shall be construed as though they were written out in full according
to applicable laws or regulations.

TEN COM - as tenants in common         UNIF GIFT MIN ACT - _____ Custodian _____
TEN ENT - as tenant by the entireties  (Cust)             (Minor)
JT TEN -  as joint tenants with right
          of survivorship and not as   under Uniform Gifts to Minors Act
          tenants in common            _________________________________________
                                                       (State)

     Additional abbreviations may also be used though not in the above list.


                                      A-9
<PAGE>

                               CONVERSION NOTICE

TO:  AT HOME CORPORATION
     STATE STREET BANK AND TRUST COMPANY OF CALIFORNIA, N.A.

     The undersigned registered owner of this Note hereby irrevocably exercises
the option to convert this Note, or the portion thereof (which is $1,000 or an
integral multiple thereof) below designated, into shares of Common Stock of At
Home Corporation in accordance with the terms of the Indenture referred to in
this Note, and directs that the shares issuable and deliverable upon such
conversion, together with any check in payment for fractional shares and any
Notes representing any unconverted principal amount hereof, be issued and
delivered to the registered holder hereof unless a different name has been
indicated below.  If shares or any portion of this Note not converted are to be
issued in the name of a person other than the undersigned, the undersigned will
provide the appropriate information below and pay all transfer taxes payable
with respect thereto.  Any amount required to be paid by the undersigned on
account of interest accompanies this Note.

Dated: ___________________

                                    ____________________________________________

                                    ____________________________________________
                                    Signature(s)

                                    Signature(s) must be guaranteed by an
                                    "eligible guarantor institution" meeting the
                                    requirements of the Note registrar, which
                                    requirements include membership or
                                    participation in the Security Transfer Agent
                                    Medallion Program ("STAMP") or such other
                                    "signature guarantee program" as may be
                                    determined by the Note registrar in addition
                                    to, or in substitution for, STAMP, all in
                                    accordance with the Securities Exchange Act
                                    of 1934, as amended.

                                    ____________________________________________
                                    Signature Guarantee

     Fill in the registration of shares of Common Stock if to be issued, and
Notes if to be delivered, other than to and in the name of the registered
holder:

________________________________________
(Name)

________________________________________
(Street Address)

________________________________________
(City, State and Zip Code)


                                     A-10
<PAGE>

__________________________________________
Please print name and address

Principal amount to be converted
(if less than all):

$________________________________________

Social Security or Other Taxpayer
Identification Number:

_________________________________________



                                     A-11
<PAGE>

                           OPTION TO ELECT REPAYMENT

                           UPON A FUNDAMENTAL CHANGE

TO:  AT HOME CORPORATION
     STATE STREET BANK AND TRUST COMPANY OF CALIFORNIA, N.A.

     The undersigned registered owner of this Note hereby irrevocably
acknowledges receipt of a notice from At Home Corporation (the "Company") as to
the occurrence of a Fundamental Change with respect to the Company and requests
and instructs the Company to repay the entire principal amount of this Note, or
the portion thereof (which is $1,000 or an integral multiple thereof) below
designated, in accordance with the terms of the Indenture referred to in this
Note at the price of 100% of such entire principal amount or portion thereof,
together with accrued interest to, but excluding, such repayment date, to the
registered holder hereof.

Dated: ___________________


                                    ____________________________________________

                                    ____________________________________________
                                    Signature(s)

                                      NOTICE:  The above signatures of the
                                      holder(s) hereof must correspond with the
                                      name as written upon the face of the Note
                                      in every particular without alteration or
                                      enlargement or any change whatever.

                                      Principal amount to be repaid (if less
                                      than all):

                                      $_________________________________________

                                      __________________________________________
                                      Social Security or Other
                                      Taxpayer Identification Number


                                     A-12
<PAGE>

                                   ASSIGNMENT

     For value received __________________________________________ hereby
sell(s) assign(s) and transfer(s) unto ___________________(Please insert social
security or other Taxpayer Identification Number of assignee) the within Note,
and herebyirrevocably constitutes and appoints ________________________________
attorney to transfer said Note on the books of the Company, with full power of
substitution in the premises.

     In connection with any transfer of the Note prior to the expiration of the
holding period applicable to sales thereof under Rule 144(k) under the
Securities Act (or any successor provision) (other than any transfer pursuant to
a registration statement that has been declared effective under the Securities
Act), the undersigned confirms that such Note is being transferred:

     [ ]  To At Home Corporation or a subsidiary thereof; or

     [ ]  Inside the United States pursuant to and in compliance with
          Rule 144A under the Securities Act of 1933, as amended; or

     [ ]  Inside the United States to an Institutional Accredited Investor
          pursuant to and in compliance with the Securities Act of 1933, as
          amended, in a minimum denomination of $100,000; or

     [ ]  Outside the Unites States in compliance with Rule 904 under the
          Securities Act; or

     [ ]  Pursuant to and in compliance with Rule 144 under the Securities Act
          of 1933, as amended;

and unless the box below is checked, the undersigned confirms that such Note is
not being transferred to an "affiliate" of the Company as defined in Rule 144
under the Securities Act of 1933, as amended (an "Affiliate").

     [ ]  The transferee is an Affiliate of the Company.

Dated: ___________________

                                    ____________________________________________

                                    ____________________________________________
                                    Signature(s)

                                    Signature(s) must be guaranteed by an
                                    "eligible guarantor institution" meeting the
                                    requirements of the Note registrar, which
                                    requirements include membership or
                                    participation in the Security Transfer Agent
                                    Medallion Program ("STAMP") or such other
                                    "signature guarantee program" as may be
                                    determined by the Note registrar in addition
                                    to, or in substitution for, STAMP, all in
                                    accordance with the Securities Exchange Act
                                    of 1934, as amended.


                                     A-13
<PAGE>

                                    ____________________________________________
                                    Signature Guarantee

NOTICE:  The signature of the conversion notice, the option to elect repayment
upon a Fundamental Change or the assignment must correspond with the name as
written upon the face of the Note in every particular without alteration or
enlargement or any change whatever.




                                     A-14
<PAGE>

                                   EXHIBIT B

At Home Corporation
450 Broadway
Redwood City, California  94063

State Street Bank and Trust Company of California, N.A., as Trustee
633 West 5th Street
12/th/ Floor
Los Angeles, California  90071
Attention:  Corporate Trust Administration

Ladies and Gentlemen:

     In connection with our proposed purchase of 4% Convertible Subordinated
Notes due 2006 (the "Notes") of At Home Corporation, a Delaware corporation (the
"Company") we confirm that:

            (i)   we are an "accredited investor" within the meaning of Rule
501(a)(1), (2) or (3) under the Securities Act of 1933, as amended (the
"Securities Act"), or an entity in which all of the equity owners are accredited
investors within the meaning of Rule 501(a)(1), (2) or (3) under the Securities
Act (an "Institutional Accredited Investor");

            (ii)  (A) any purchase of Notes by us will be for our own account or
for the account of one or more other Institutional Accredited Investors or as
fiduciary for the account of one or more trusts, each of which is an "accredited
investor" within the meaning of Rule 501(a)(7) under the Securities Act and for
each of which we exercise sole investment discretion or (B) we are a "bank,"
within the meaning of Section 3(a)(2) of the Securities Act, or a "savings and
loan association" or other institution described in Section 3(a)(5)(A) of the
Securities Act that is acquiring Notes as fiduciary for the account of one or
more institutions for which we exercise sole investment discretion;

            (iii)  the event that we purchase any Notes, we will acquire Notes
having a minimum purchase price of not less than $100,000 for our own account or
for any separate account for which we are acting;

            (iv)   we have such knowledge and experience in financial and
business matters that we are capable of evaluating the merits and risks of
purchasing Notes; and

            (v)    we are not acquiring Notes with a view to distribution
thereof or with any present intention of offering or selling Notes or the Common
Stock of the Company issuable upon conversion thereof, except as permitted
below; provided that the disposition of our property and property of any
accounts for which we are acting as fiduciary shall remain at all times within
our control.

     We understand that the Notes are being offered in a transaction not
involving any public offering within the United States within the meaning of the
Securities Act and that the Notes and the Common Stock of the Company issuable
upon conversion thereof have not been registered under the Securities Act, and
we agree, on our own behalf and on behalf of each account for which we acquire
any Notes, that if in the future we decide to resell or otherwise transfer such
Notes or the Common Stock of the Company issuable upon conversion thereof, such
Notes or Common Stock of the Company may be resold or otherwise transferred
<PAGE>

only (i) to the Company or any subsidiary thereof, (ii) inside the United States
to a person who is a "qualified institutional buyer" (as defined in Rule 144A
under the Securities Act) in a transaction meeting the requirements of Rule
144A, (iii) inside the United States to an Institutional Accredited Investor
that, prior to such transfer, furnishes to the Trustee for the Notes (or in the
case of Common Stock of the Company, the transfer agent therefor) a signed
letter containing certain representations and agreements relating to the
restrictions on transfer of such securities (the form of which letter can be
obtained from the Trustee or the transfer agent, as the case may be), (iv)
outside the United States in a transaction meeting the requirements of Rule 904
under the Securities Act, (v)pursuant to the exemption from registration
provided by Rule 144 under the Securities Act (if applicable), or (vi) pursuant
to a registration statement that has been declared effective under the
Securities Act (and which continues to be effective at the time of such
transfer), and in each case, in accordance with any applicable securities law of
any state of the United States and in accordance with the legends set forth on
the Notes or the Common Stock of the Company issuable upon conversion thereof.
We further agree to provide any person purchasing any of the Notes or the Common
Stock of the Company issuable upon conversion thereof (other than pursuant to
clause (v) or (vi) above) from us a notice advising such purchaser that resales
of such securities are restricted as stated herein. We understand that the
Trustee and transfer agent for the Notes and the Common Stock of the Company
will not be required to accept for registration of transfer any Notes or any
Common Stock of the Company issued upon conversion of the Notes, except upon
presentation of evidence satisfactory to the Company that the foregoing
restrictions on transfer have been complied with. We further understand that any
Notes and any Common Stock of the Company issued upon conversion of the Notes
will be in the form of definitive physical certificates and that such
certificates will bear a legend reflecting the substance of this paragraph other
than certificates transferred pursuant to (v) or (vi) above.

     The Company and the Trustee and their respective counsel are entitled to
rely upon this letter and are irrevocably authorized to produce this letter or a
copy hereof to any interested party in any administrative or legal proceeding or
official inquiry with respect to the matters covered hereby.

     THIS LETTER SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE
INTERNAL LAWS OF THE STATE OF NEW YORK.

                                    (Name of Purchaser)

                                    By:_________________________________________
                                    Name:_______________________________________
                                    Title:______________________________________

                                    Address:____________________________________

                                    ____________________________________________

                                    ____________________________________________


                                      B-2