Document:

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                                                                   EXHIBIT 10.12
                             JAMISON BUILDING LEASE

                                ADDENDUM 10-1-03

SUITE NO:    101, 201, and 207
LANDLORD:    CEAD Partners, Inc.
TENANT:      ASTI Operating Company, Inc.

         Existing lease is hereby extended 12 months beginning October 1, 2003
and ending September 30, 2004. The new rental rate will be $3,815.00 per month.
Checks and notices will be made to INVESTwest C.T.A. and delivered to their new
address of 376 SW Bluff Drive, #3, Bend, OR 97702. All other terms and
conditions of the lease will remain the same.

LANDLORD:    By: /s/ Bruce Rhine                       Date:  10/10/03
                 --------------------------
                 Bruce Rhine

TENANT:      ASTI Operating Company, Inc.

             By: /s/ Pat Huber                                Date:  10/10/03
                 --------------------------
                 Pat Huber, Controller

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                                                                   EXHIBIT 10.13

                                   SELLER NOTE

$8,000,000.00                                                  San Francisco, CA
                                                                   July 31, 2000

         FOR VALUE RECEIVED, ACCENT SEMICONDUCTOR TECHNOLOGIES, INC., a Delaware
corporation ("MAKER"), promises to pay to BIO-RAD LABORATORIES, INC. ("BIO-RAD"
or "PAYEE"), at the time, in the manner and at the place hereinafter provided,
the principal sum of (x) EIGHT MILLION AND NO/100 DOLLARS ($8,000,000.00) plus
(y) the aggregate amount of any Additional Principal (as defined below) with
respect to this Note.

         The outstanding principal amount of this Note (including any Additional
Principal), together with any accrued interest thereon, shall be due and payable
by Maker to Payee on July 31, 2005 (the "MATURITY DATE").

         Maker also promises to pay interest on the unpaid principal amount of
this Note (including any Additional Principal) at 13.5% per annum from the date
of issuance hereof until paid in full; provided, however, that any principal
amount, interest, premium or other amount payable hereunder that is not paid
when due, whether at stated maturity, by required prepayment, acceleration or
otherwise, shall bear interest payable upon demand at 17.5% per annum,
compounded semi-annually on each Interest Payment Date (as defined below).
Subject to the preceding sentence, interest shall be due and payable
semiannually in arrears on and to June 30 and December 31 of each year,
commencing on the first such day to occur after the date of issuance of this
Note, and on the Maturity Date (each, an "INTEREST PAYMENT DATE"). All
computations of interest shall be made on the basis of a 360-day year, for the
actual number of days elapsed in the relevant period (including the first day
but excluding the last day).

         Anything contained in this Note to the contrary notwithstanding, during
the period commencing on the date of issuance of this Note and ending on the
Maturity Date, Maker may, in its sole discretion, in lieu of paying interest in
cash, on the date payment of such interest would otherwise be due, increase the
principal amount of this Note in an aggregate amount equal to the amount of such
accrued and unpaid interest hereon (the amount of each such increase being
"ADDITIONAL PRINCIPAL" with respect hereto), and upon such increase in principal
amount such accrued and unpaid interest shall for all purposes hereunder be
deemed paid and shall cease to be due and payable at such time and such
Additional Principal shall instead be due and payable on the Maturity Date.

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         1.       PAYMENTS. All payments of principal and interest in respect of
this Note shall be made in lawful money of the United States of America in same
day funds at such place as shall be designated in writing by Payee for such
purpose. Whenever any payment on this Note is stated to be due on a day that is
not a business day in San Francisco, California ("BUSINESS DAY"), such payment
shall instead be made on the next Business Day, and such extension of time shall
be included in the computation of interest payable on this Note. Each payment
made hereunder shall be credited first to interest then due and the remainder of
such payment shall be credited to principal, and interest shall thereupon cease
to accrue upon the principal so credited. Subject to Section 4, Payee agrees, by
its acceptance hereof, that before disposing of this Note or any part hereof it
will make a notation hereon of all principal payments previously made hereunder
and of the date to which interest hereon has been paid; provided, however, that
the failure to make a notation of any payment made on this Note shall not limit
or otherwise affect the obligation of Maker hereunder with respect to payments
of principal or interest on this Note.

         2.       PREPAYMENTS.

                  (a)      Voluntary Prepayments. Maker shall have the right at
any time and from time to time to prepay the principal of this Note in whole or
in part, without premium or penalty.

                  (b)      Mandatory Prepayments. If (y) Maker or any Qualified
Subsidiary or Affiliate shall complete an Initial Public Offering prior to the
Maturity Date, or (z) a Change in Control occurs on or before the Maturity Date,
then Maker shall subject to the restrictions contained in paragraph 7 below,
prepay within two (2) Business Days after the date of completion of such Initial
Public Offering or the occurrence of such Change of Control, as the case may be,
the outstanding principal amount of this Note, together with any accrued
interest hereon, without premium or penalty and up to the full extent thereof;
provided that, in the event that Maker or any Qualified Subsidiary or Affiliate
shall complete an Initial Public Offering before March 1, 2001, Maker shall not
be required to make any prepayments pursuant to this Section 2(b) until March 1,
2001. For the purposes of this Section 2(b):

                           (i)      "INITIAL PUBLIC OFFERING" shall mean a
                  primary public offering (whether or not underwritten, but
                  excluding any offering pursuant to Form S-8 under the
                  Securities Act of 1933, as amended (the "SECURITIES ACT") or
                  any other publicly registered offering pursuant to the
                  Securities Act solely pertaining to an issuance of shares of
                  common stock of Maker or any Qualified Subsidiary or Affiliate
                  or securities exercisable therefor under any benefit plan,
                  employee compensation plan, or employee or director stock
                  purchase plan) of the common stock of Maker or any Qualified
                  Subsidiary or Affiliate pursuant to an

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                  effective registration statement under the Securities Act in
                  which Maker or any Qualified Subsidiary or Affiliate receives
                  aggregate gross proceeds of at least $35,000,000;

                           (ii)     "CHANGE OF CONTROL" shall mean:

                                    (A)      the consummation of a plan of
                  reorganization, merger or consolidation involving Maker or any
                  Qualified Subsidiary or Affiliate (for purposes of this
                  definition, the "REORGANIZING CORPORATION"), except for a
                  reorganization, merger or consolidation where (x) the ultimate
                  shareholders of the Reorganizing Corporation immediately prior
                  to such reorganization, merger or consolidation (determined
                  after giving pro forma effect to any transaction relating to
                  Timbre Technologies, Inc., whether structured as a
                  reorganization, merger, consolidation, acquisition or other
                  transaction) own directly or indirectly at least 50% of the
                  combined voting power of the outstanding voting securities of
                  the corporation resulting from such reorganization, merger or
                  consolidation (for purposes of this definition, the "SURVIVING
                  CORPORATION") and the individuals who were members of the
                  incumbent Board of Directors immediately prior to the
                  execution of the agreement providing for such reorganization,
                  merger or consolidation constitute at least 50% of the members
                  of the board of directors of the Surviving Corporation, or (y)
                  the Reorganizing Corporation is reorganized, merged or
                  consolidated with a corporation in which any shareholder
                  owning directly or indirectly at least 50% of the combined
                  voting power of the outstanding voting securities of the
                  Reorganizing Corporation immediately prior to such
                  reorganization, merger or consolidation (determined after
                  giving pro forma effect to any transaction relating to Timbre
                  Technologies, Inc., whether structured as a reorganization,
                  merger, consolidation, acquisition or other transaction), owns
                  directly or indirectly at least 50% of the combined voting
                  power of the outstanding voting securities of the corporation
                  resulting from such reorganization, merger or consolidation;

                                    (B)      the sale of fifty percent (50%) or
                  more of the assets of the Division Businesses by Maker or any
                  Qualified Subsidiary or Affiliate, in a single transaction or
                  in a series of related transactions, to any Person other than
                  Maker or a wholly-owned Subsidiary of Maker or of such
                  Qualified Subsidiary or Affiliate; or

                                    (C)      the acquisition of beneficial
                  ownership of stock representing more than fifty percent (50%)
                  of the voting power of Maker or any Qualified Subsidiary or
                  Affiliate then outstanding by any

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                  Person other than the shareholders of Maker existing on the
                  date hereof (including the Persons the shareholders of Maker
                  are permitted to transfer stock to, and Maker is permitted to
                  issue stock to, pursuant to that certain letter agreement
                  dated as of the date hereof by and among Maker and the
                  shareholders of Maker existing on the date hereof) and such
                  shareholders' Subsidiaries and Affiliates (determined after
                  giving pro forma effect to any transaction relating to Timbre
                  Technologies, Inc., whether structured as a reorganization,
                  merger, consolidation, acquisition or other transaction); and

                           (iii)    "QUALIFIED SUBSIDIARY OR AFFILIATE" shall
                  mean any Subsidiary or Affiliate of Maker that conducts all or
                  substantially all of the Division Businesses as conducted on
                  the date hereof.

                  (c)      Additional Mandatory Prepayment. In the event that
there is any amount due and payable by any of the Seller Parties to any of the
Buyer Indemnified Parties pursuant to the terms and conditions of Article X of
the Transaction Agreement (the "SELLER PARTIES INDEMNIFICATION PAYMENT"), then,
upon written notice by Payee to Maker, a mandatory prepayment of this Note equal
in amount to the Seller Parties Indemnification Payment shall immediately become
due and payable, and Maker shall be deemed to have made such mandatory
prepayment on the date such notice is received in lieu of receiving such amount
due and payable by the Seller Parties pursuant to the terms and conditions of
Article X of the Transaction Agreement. The aggregate outstanding amount of
principal and interest of this Note shall be automatically reduced by the amount
of such deemed mandatory prepayment on the date such mandatory prepayment is
deemed made.

                  (d)      Notice of Prepayments. Maker shall give notice of the
amount of any prepayment of this Note (other than any mandatory prepayment
pursuant to Section 2(c)) to Payee at least three Business Days prior to the
date of such prepayment. Notice of prepayment having been given as aforesaid,
the principal of this Note shall become due and payable on the prepayment date
specified in such notice in the aggregate principal amount specified therein.
Any prepayment made pursuant to this Note (other than any mandatory prepayment
pursuant to Section 2(c)) shall be accompanied by interest on the principal
amount of this Note being prepaid to the date of prepayment.

         3.       REFERENCE AGREEMENTS. This Note is issued pursuant to the
terms of the Transaction Agreement dated as of June 29, 2000 (such agreement, as
it may be amended, restated, supplemented or otherwise modified from time to
time, being the "TRANSACTION AGREEMENT"), by and among Maker, ASTI Operating
Company, Inc., a Delaware corporation, Bio-Rad Laboratories, Inc., a Delaware
corporation, Sandia Systems, Inc., a New Mexico corporation, Bio-Rad
Micromeasurements Limited,

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(company registration number 2254900) a company incorporated in England and
Wales with its registered office at Haxby Road, York, North Yorkshire, YO3 7SD,
England, and Bio-Rad Microscience Limited, (company registration number 1060779)
a company incorporated in England and Wales with its registered office at
Bio-Rad House, Maylands Avenue, Hemel Hempstead, Hertfordshire, HP2 7TD,
England, and is subject to the terms and conditions thereof. Capitalized terms
used herein without definition have the meanings assigned to such terms in the
Transaction Agreement.

         4.       TRANSFER. This Note may not be transferred, assigned, pledged
or hypothecated in whole or in part without the prior written consent of Maker;
provided that Payee may pledge this Note to the lenders under Payee's secured
credit facility pursuant to a pledge agreement in form and substance reasonably
satisfactory to Maker (which pledge agreement shall provide, among other things,
that such pledgee or pledgees, as the case may be, shall be bound by all of the
terms and provisions of this Note). Any transfer in violation of the preceding
sentence shall be void ab initio.

         5.       UNREGISTERED NOTE. Payee, by acceptance hereof, acknowledges
that this Note has not been registered under the Securities Act, represents and
warrants that Payee is an "accredited investor as that term is defined in Rule
501 under the Securities Act, and covenants and agrees with Maker that Payee is
taking and holding this Note for investment and not with a view to, or for sale
in connection with, a distribution hereof.

         6.       REPRESENTATIONS AND WARRANTIES. Maker hereby represents and
warrants to Payee on the date of issuance of this Note that:

                           (i)      it is a duly formed and validly existing
         corporation in good standing under the laws of the State of Delaware
         and has the corporate power and authority to own and operate its
         properties, to transact the business in which it is now engaged and as
         proposed to be conducted following consummation of the transactions
         contemplated under the Transaction Agreement and to execute and deliver
         this Note;

                           (ii)     this Note constitutes the duly authorized,
         legally valid and binding obligation of Maker, enforceable against
         Maker in accordance with its terms, except as may be limited by
         bankruptcy, insolvency, reorganization, moratorium or similar laws
         relating to or limiting creditors' rights generally or by equitable
         principles relating to enforceability;

                           (iii)    all Approvals required to have been granted
         by any Person in connection with the execution, delivery and
         performance of this Note by Maker have been granted; and

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                           (iv)     the execution, delivery and performance by
         Maker of this Note do not and will not violate any law, governmental
         rule or regulation, court order or agreement to which it is subject or
         by which its properties are bound or the certificate of incorporation
         or bylaws of Maker.

         7.       SUBORDINATION.

                  (a)      Agreement To Subordinate. Maker and, by acceptance of
this Note, Payee agree that the Indebtedness evidenced by this Note and all
amounts payable hereunder (including, without limitation, any payment on account
of any acquisition or redemption of this Note or any amounts payable pursuant to
Section 2(b) or 2(c) hereof) are subordinated, to the extent and in the manner
provided in this Section 7, to the prior payment in full in cash of all Senior
Debt (whether outstanding on the date hereof or hereafter created, incurred,
assumed or guaranteed), and that the subordination is for the benefit of the
holders of Senior Debt. This Section 7 shall constitute a continuing offer to
all Persons who, in reliance upon such provisions, become holders of, or
continue to hold, Senior Debt, and such provisions are made for the benefit of
the holders of the Senior Debt, and such holders are made obligees hereunder and
any one or more of them may enforce such provisions.

                  (b)      Liquidation; Dissolution; Bankruptcy. A distribution
may consist of cash, securities or other property, by set-off or otherwise. Upon
any distribution of assets of the Maker to creditors of Maker in a liquidation
or dissolution of Maker or upon any dissolution, winding up, total or partial
liquidation or reorganization of the Maker, whether voluntary or involuntary, in
bankruptcy, reorganization, insolvency, receivership or similar proceeding, or
upon an assignment for the benefit of creditors or any marshalling of Maker's
assets and liabilities:

                           (i)      the holders of all Senior Debt shall first
         be entitled to receive payment in full in cash of all Obligations due
         in respect of such Senior Debt (including without limitation interest
         after the commencement of any such proceeding at the rate specified in
         the applicable Senior Debt) before Payee shall be entitled to receive
         any payment with respect to this Note (except that Payee may receive
         Permitted Junior Securities);

                           (ii)     until all Obligations with respect to Senior
         Debt (as provided in subsection (i) above) are paid in full in cash,
         any distribution to which Payee would be entitled but for this Section
         7 shall be made to holders of Senior Debt (except that Payee may
         receive Permitted Junior Securities), as their interests may appear, to
         the extent necessary to make payment in full in cash of all Senior Debt
         remaining unpaid after giving effect to all concurrent payments and
         distributions to the holders of the Senior Debt; and

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                           (iii)    in the event that, notwithstanding the
         foregoing clauses (i) and (ii), any payment or distribution of assets
         of the Maker of any kind or character, whether in cash, property or
         securities (other than payment or distribution in the form of Permitted
         Junior Securities) shall be received by the Payee on account of any
         Obligations under this Note before all Senior Debt is paid in full in
         cash, such payment or distribution shall be received and held in trust
         by the Payee for the benefit of the holders of such Senior Debt, or
         their respective Representatives, to the extent necessary to make
         payment in full in cash of all such Senior Debt remaining unpaid after
         giving effect to all concurrent payments and distributions to the
         holders of such Senior Debt.

                  (c)      Default on Designated Senior Debt. Maker may not make
any payment or distribution to Payee in respect of Obligations with respect to
this Note (other than any mandatory prepayment pursuant to Section 2(c)) and may
not acquire from Payee all or any portion of this Note for cash or property
(other than Permitted Junior Securities) until all principal (including letter
of credit reimbursement obligations) and other Obligations with respect to the
Senior Debt have been paid in full in cash if:

                           (i)      a default in the payment of any principal
         (including letter of credit reimbursement obligations) or other
         Obligations with respect to Designated Senior Debt when the same
         becomes due and payable, whether at maturity or at a date fixed for
         prepayment or by declaration or otherwise (a "PAYMENT DEFAULT") occurs,
         unless and until such Payment Default has been cured or waived in
         writing or has ceased to exist; or

                           (ii)     a default, other than a Payment Default, on
         Designated Senior Debt occurs and is continuing that then permits
         holders of such Designated Senior Debt to accelerate the maturity
         thereof or demand payment and Maker receives a notice of such default
         (a "PAYMENT BLOCKAGE NOTICE") from the Representative of the holders of
         Designated Senior Debt or from the holders of Designated Senior Debt.
         Any number of Payment Blockage Notices may be given; provided, however,
         if Maker receives any such Payment Blockage Notice, no subsequent
         Payment Blockage Notice shall be effective for purposes of this Section
         unless and until at least 180 consecutive days shall have elapsed since
         the effectiveness of the immediately prior Payment Blockage Notice. No
         default that existed or was continuing on the date of delivery of any
         Payment Blockage Notice to Maker shall be, or be made, the basis for
         the commencement of any other payment blockage period unless such
         default shall have been cured or waived for a period of not less than
         90 days.

         Maker may and shall resume payments on and distributions in respect of
this Note and may acquire all or any portion of this Note upon the earlier of:

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                           (1)      the date upon which the default is cured or
         waived in writing by the holders of the Designated Senior Debt, or

                           (2)      in the case of a default referred to in
         Section 7(c)(ii) hereof, 180 days after the Payment Blockage Notice is
         received (provided such Designated Senior Debt as to which such Payment
         Blockage Notice was given shall not theretofore have been accelerated
         or any other Payment Default shall have occurred and be continuing),

         if this Section 7 otherwise permits the payment, distribution or
acquisition at the time of such payment or acquisition.

         In addition, Payee agrees that it shall not take or omit to take any
action or assert any claim with respect to this Note or otherwise which is
inconsistent with the provisions of this Note. Without limiting the foregoing,
the Payee will not assert, collect or enforce the obligations owing hereunder or
any part thereof or take any action to foreclose or realize upon the obligations
owing hereunder or any part thereof or enforce this Note (except to the extent
(but only to such extent) that the commencement of a legal action may be
required to toll the running of any applicable statute of limitation or to file
a proper proof of claim or proof of debt in the form required in any judicial
proceedings) if (a) a Payment Default has occurred and is continuing, unless and
until such Payment Default has been cured or waived in writing or has ceased to
exist or (b) a default other than a Payment Default on Designated Senior Debt
occurs and is continuing that then permits holders of such Designated Senior
Debt to accelerate the maturity thereof or demand payment and Payee receives a
notice of such default and a notice indicating the Payee is prohibited from
taking any action hereunder (a "REMEDY BLOCKAGE NOTICE") from the Representative
of the holders of such Designated Senior Debt or from the holders of such
Designated Senior Debt. The Payee shall be permitted to take action or assert
any claim (i) as to any blockage as a result of any Payment Default, on the date
on which any Payment Default is cured or waived in writing and (ii) as to any
blockage as a result of any other default, 180 days pass after the Remedy
Blockage Notice is received (provided such Designated Senior Debt as to which
such Remedy Blockage Notice was given shall not theretofore have been
accelerated or any other Payment Default shall have occurred and be continuing).

                  (d)      Acceleration of Note. If payment of this Note is
accelerated because of an Event of Default (other than an Event of Default
pursuant to Section 8(b) or 8(c)), Maker shall promptly notify holders of Senior
Debt of such acceleration. In addition, so long as the Senior Bank Credit
Agreement or any Hedging Obligation is in effect, the Payee hereunder hereby
agrees that such acceleration shall not become effective until ten (10) Business
Days after delivery of such notice to the Representative under the Senior Bank
Credit Agreement.

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                  (e)      When Distribution Must Be Paid Over. In the event
that Payee receives any payment of any Obligations with respect to this Note
(including without limitation, any amounts pursuant to Section 2(b) or Section
2(c) hereof), whether in cash, property or securities (other than the Permitted
Junior Securities) at a time when such payment or distribution was prohibited by
the provisions of this Section 7 then, unless such payment or distribution is no
longer prohibited by this Section 7, such payment or distribution shall be
received and held in trust by the Payee for the benefit of the holders of the
Senior Debt and shall be paid or delivered by the Payee to the holders of Senior
Debt remaining unpaid or unprovided for in cash or their respective
Representatives, ratably according to the aggregate amounts on account of the
Senior Debt of the Maker held or represented by each, for application to the
payment in cash of all Senior Debt remaining unpaid, to the extent necessary to
pay or to provide for the payment of all such Senior Debt in full in cash after
giving effect to any concurrent payment or distribution to the holders of such
Senior Debt.

                  (f)      Subrogation. Subject to the payment in full in cash
of all Senior Debt and the termination of any and all commitments to lend
thereunder, Payee shall be subrogated (equally and ratably with all other
Indebtedness pari passu with this Note) to the rights of holders of Senior Debt
to receive payments or distributions of assets of the Maker applicable to Senior
Debt to the extent that distributions otherwise payable to Payee have been
applied to the payment of Senior Debt. A distribution made under this Section 7
to holders of Senior Debt that otherwise would have been made to Payee is not,
as between Maker and Payee, a payment by Maker on this Note.

                  (g)      Relative Rights. This Section 7 defines the relative
rights of Payee and holders of Senior Debt. Nothing in this Note shall:

                           (i)      impair, as between Maker and Payee, the
         obligation of Maker, which is absolute and unconditional, to pay
         principal of and interest on this Note in accordance with its terms;

                           (ii)     affect the relative rights of Payee and
         creditors of Maker other than their rights in relation to holders of
         Senior Debt; or

                           (iii)    prevent Payee from exercising its available
         remedies upon an Event of Default, subject to the rights of holders and
         owners of Senior Debt to receive distributions and payments otherwise
         payable to Payee.

         If Maker fails because of this Section 7 to pay principal of or
interest on this Note on the due date, the failure shall nevertheless be an
Event of Default.

                  (h)      Subordination May Not Be Impaired by Maker. No right
of any holder of Senior Debt to enforce the subordination of the Indebtedness
evidenced by

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this Note shall be impaired by any act or failure to act by Maker or Payee or by
the failure of Maker or Payee to comply with the terms of this Note.

                  (i)      Distribution or Notice to Representative. Whenever a
distribution is to be made or a notice given to holders of Senior Debt, the
distribution may be made and the notice given to their Representative.

         Upon any payment or distribution of assets of Maker referred to in this
Section 7, Payee shall be entitled to rely upon any order or decree made by any
court of competent jurisdiction or upon any certificate of such Representative
or of the liquidating trustee or agent or other Person making any distribution
to Payee for the purpose of ascertaining the Persons entitled to participate in
such distribution, the holders of the Senior Debt and other Indebtedness of
Maker, the amount thereof or payable thereon, the amount or amounts paid or
distributed thereon and all other facts pertinent thereto or to this Section 7.

                  (j)      Authorization To Effect Subordination. Payee
authorizes and directs Maker on Payee's behalf to take such action as may be
necessary or appropriate to effectuate the subordination as provided in this
Section 7, and appoints Maker to act as Payee's attorney-in-fact for any and all
such purposes. If Payee does not file a proper proof of claim or proof of debt
in the form required in any judicial proceedings relative to Maker, its
creditors or its property at least 30 days before the expiration of the time to
file such claim, the Representatives are hereby authorized to file an
appropriate claim for and on behalf of Payee.

                  (k)      Amendments. The provisions of this Section 7 shall
not be amended or modified without the written consent of the Majority Banks (as
such term is defined in the Senior Bank Credit Agreement or an analogous term
used in the Senior Bank Credit Agreement).

         (1)      Changes In Senior Debt. Any holder of Senior Debt may at any
time and from time to time without the consent of or notice to Payee: (i)
extend, renew, modify, waive or amend the terms of the Senior Debt; provided,
however, in no event may any such Senior Debt be increased if the aggregate
amount of all Senior Debt after giving effect to such increase would exceed
$70,000,000; (ii) sell, exchange, release or otherwise deal with any property
pledged, mortgaged or otherwise securing Senior Debt; (iii) release any
guarantor or any other person (except Maker) liable in any manner for the Senior
Debt or amend or waive the terms of any guaranty of Senior Debt; (iv) exercise
or refrain from exercising any rights against Maker or any other Person; (v)
apply any sums by whomever paid or however realized to Senior Debt; and (vi)
take any other action which otherwise might be deemed to impair the rights of
the holders of Senior Debt without incurring any responsibility to Payee and
without impairing or releasing the obligations of Payee to the holders of Senior
Debt.

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         For the purposes of this Note, the following terms used in this Note
shall have the following meanings (and any of such terms may, unless the context
otherwise requires, be used in the singular or the plural depending on the
reference):

         "CAPITAL LEASE" as applied to any Person, means any lease of any
property (whether real, personal or mixed) by that Person as lessee that, in
conformity with GAAP, would be required to be accounted for as a capital lease
on the balance sheet of that Person.

         "CAPITAL LEASE OBLIGATION" means, at the time any determination thereof
is to be made, the amount of the liability in respect of a Capital Lease that
would at such time be required to be capitalized on a balance sheet in
accordance with GAAP.

         "CAPITAL STOCK" means (i) in the case of a corporation, corporate
stock; (ii) in the case of an association or business entity, any and all
shares, interests, participations, rights or other equivalents (however
designated) of corporate stock; (iii) in the case of a partnership or limited
liability company, partnership or membership interests (whether general or
limited); and (iv) any other interest or participation that confers on a Person
the right to receive a share of the profits and losses of, or distributions of
assets of, the issuing Person.

         "DESIGNATED SENIOR DEBT" means (i) the Senior Bank Credit Agreement or
any Hedging Obligations, entered into by Maker or any of its Subsidiaries with
lenders (or Affiliates of such lenders) under, and in respect of Indebtedness
under, the Senior Bank Credit Agreement, and (ii) after payment in full of all
Obligations outstanding under the Senior Bank Credit Agreement and the
termination of all commitments to lend thereunder, any other Senior Debt
permitted hereunder the principal amount of which is $25,000,000 or more and
that has been designated by Maker as "Designated Senior Debt."

         "EQUITY INTERESTS" means Capital Stock and all warrants, options or
other rights to acquire Capital Stock (but excluding any debt security that is
convertible into, or exchangeable for, Capital Stock).

         "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as have been approved by a significant segment of the accounting
profession, which are in effect from time to time.

         "GUARANTEE" means a guarantee other than by endorsement of negotiable
instruments for collection in the ordinary course of business, direct or
indirect, in any

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manner including without limitation by way of a pledge of assets or through
letters of credit or reimbursement agreements in respect thereof, of all or any
part of any Indebtedness.

         "HEDGING OBLIGATIONS" means, with respect to any Person, the
obligations of such Person under (i) interest rate swap agreements, interest
rate cap agreements and interest rate collar agreements and other agreements or
arrangements designed to protect such Person against fluctuations in interest
rates, and (ii) foreign exchange contracts, currency swap agreements or other
similar agreements or arrangements designed to protect such Person against
fluctuations in currency values.

         "INDEBTEDNESS" means, with respect to any Person, any indebtedness of
such Person, whether or not contingent, in respect of borrowed money or
evidenced by bonds, notes, debentures or similar instruments or letters of
credit (or reimbursement agreements in respect thereof) or banker's acceptances
or representing Capital Lease Obligations or the balance deferred and unpaid of
the purchase price of any property or representing any Hedging Obligations,
except any such balance that constitutes an accrued expense or trade payable. if
and to the extent any of the foregoing (other than letters of credit and Hedging
Obligations) would appear as a liability upon a balance sheet of such Person
prepared in accordance with GAAP, as well as all Indebtedness of others secured
by a lien on any asset of such Person (whether or not such Indebtedness is
assumed by such Person) and, to the extent not otherwise included, the Guarantee
by such Person of any indebtedness of any other Person. The amount of any
Indebtedness outstanding as of any date shall be (i) the accreted value thereof,
in the case of any Indebtedness issued with original issue discount, and (ii)
the principal amount thereof, together with any interest thereon that is more
than 30 days past due, in the case of any other Indebtedness.

         "OBLIGATIONS" means any principal, interest, penalties, fees, costs,
enforcement expenses (including legal fees and disbursements), collateral
protection expenses, reimbursements, indemnity obligations, damages and other
liabilities and obligations payable under the documentation governing the Senior
Bank Credit Agreement (including, without limitation, post-petition interest
thereon and expenses in respect thereof, whether or not constituting an
allowable claim against the Maker or any Subsidiary of the Maker in any
proceeding under any bankruptcy law) or any other Indebtedness.

         "PERMITTED JUNIOR SECURITIES" means Equity Interests in Maker or debt
securities that are unsecured and are subordinated to all Senior Debt (and any
debt securities issued in exchange for Senior Debt) to substantially the same
extent as, or to a greater extent than, this Note is subordinated to Senior Debt
pursuant to Section 7 hereof. Without limiting the generality of the foregoing,
such securities shall have no required principal payments until after the final
maturity of all Senior Debt.

                                                                         PAGE 12
<PAGE>

         "REPRESENTATIVE" means the indenture trustee or other trustee, agent or
representative for any Senior Debt.

         "SENIOR BANK CREDIT AGREEMENT" means that credit agreement dated as of
the date hereof by and among Maker, as guarantor, certain of Maker's
Subsidiaries and certain financial institutions initially providing for up to
$22,500,000 of revolving and term credit borrowings, together with any related
notes, guarantees, collateral documents, instruments and agreements executed in
connection therewith, in each case as amended, amended and restated, refinanced,
renewed, refunded, replaced, restructured (including without limitation to
increase the amount of available borrowing thereunder, but in no event shall the
sum of the amount outstanding thereunder plus the amount of available borrowing
thereunder (in each case, as so increased), when added to all other Senior Debt,
exceed in the aggregate $70,000,000 at any time), supplemented or otherwise
modified from time to time.

         "SENIOR DEBT" means (i) all principal, interest, fees, costs,
enforcement expenses (including legal fees and disbursements), collateral
protection expenses, other reimbursement or indemnity obligations or other
obligations created or evidenced by the Senior Bank Credit Agreement or any of
the other documents, agreements or instruments executed in connection with the
Senior Bank Credit Agreement and all Hedging Obligations (including, without
limitation, post-petition interest thereon and expenses in respect thereof,
whether or not constituting an allowable claim against the Maker or any
Subsidiary of the Maker in any proceeding under any bankruptcy law), (ii) any
other Indebtedness incurred by Maker or any of its Subsidiaries and designated
by Maker or its applicable Subsidiary as Senior Debt (other than Indebtedness of
Maker or any of its Subsidiaries that is by its terms expressly subordinated to,
or pari passu with, the Indebtedness represented by this Note) that does not
exceed in the aggregate, when added to the maximum Indebtedness permitted under
the Senior Bank Credit Agreement and all Hedging Obligations with respect
thereto, $70,000,000, and (iii) all Obligations with respect to the foregoing.
Notwithstanding anything in this definition to the contrary, Senior Debt will
not include (x) any liability for federal, state, local or other taxes owed or
owing by Maker, (y) any Indebtedness of Maker to any of its Subsidiaries,
Affiliates or Associates or (z) any trade payables.

         8.       EVENTS OF DEFAULT. The occurrence of any of the following
events shall constitute an "EVENT OF DEFAULT":

                  (a)      failure of Maker to pay any principal, interest or
other amount due under this Note and such default shall have continued for a
period of ten (10) days after the date due; or

                                                                         PAGE 13
<PAGE>

                  (b)      (i) a court having jurisdiction in the premises shall
enter a decree or order for relief in respect of Maker or any of its
Subsidiaries in an involuntary case under Title 11 of the United States Code
entitled "Bankruptcy" (as now and hereinafter in effect, or any successor
thereto, the "BANKRUPTCY CODE") or any applicable bankruptcy, insolvency or
other similar law now or hereafter in effect, which decree or order is not
stayed; or any other similar relief shall be granted under any applicable
federal or state law; or (ii) an involuntary case shall be commenced against
Maker or any of its Subsidiaries under any applicable bankruptcy, insolvency or
other similar law now or hereafter in effect; or a decree or order of a court
having jurisdiction in the premises for the appointment of a receiver,
liquidator, sequestrator, trustee, custodian or other officer having similar
powers over Maker or any of its Subsidiaries or over all or a substantial part
of its property shall have been entered; or the involuntary appointment of an
interim receiver, trustee or other custodian of Maker or any of its Subsidiaries
for all or a substantial part of its property shall have occurred; or a warrant
of attachment, execution or similar process shall have been issued against any
substantial part of the property of Maker or any of its Subsidiaries, and, in
the case of any event described in this clause (ii), such event shall have
continued for 60 days unless dismissed, bonded or discharged; or

                  (c)      an order for relief shall be entered with respect to
Maker or any of its Subsidiaries or Maker or any of its Subsidiaries shall
commence a voluntary case under the Bankruptcy Code or any applicable
bankruptcy, insolvency or other similar law now or hereafter in effect, or shall
consent to the entry of an order for relief in an involuntary case, or to the
conversion of an involuntary case to a voluntary case, under any such law, or
shall consent to the appointment of or taking possession by a receiver, trustee
or other custodian for all or a substantial part of its property; or Maker or
any of its Subsidiaries shall make an assignment for the benefit of creditors;
or Maker or any of its Subsidiaries shall be unable or fail, or shall admit in
writing its inability, to pay its debts as such debts become due; or the Board
of Directors of Maker or any of its Subsidiaries (or any committee thereof)
shall adopt any resolution or otherwise authorize action to approve any of the
foregoing; or

                  (d)      Maker shall fail to perform or observe any term,
covenant or condition on its part to be performed or observed under any
agreement or instrument relating to any Indebtedness (including, without
limitation, Senior Debt) in a principal amount in excess of $2,000,000, when
required to be performed or observed after taking into account any applicable
grace or cure periods; provided that such failure to perform or observe shall
constitute an Event of Default only if the effect of such failure to perform or
observe results in the acceleration of the maturity of such Indebtedness prior
to its stated maturity; provided further that such failure to perform or observe
shall cease to constitute an Event of Default if the maturity of such
Indebtedness shall cease to be accelerated; or

                                                                         PAGE 14
<PAGE>

                  (e)      any representation or warranty made by Maker in this
Note shall prove to have been incorrect in any material respect on or as of the
date made.

         9.       REMEDIES. Subject to Section 7, upon the occurrence of any
Event of Default, Payee may, at its option, after notice in writing to Maker,
declare the Note to be forthwith due and payable and thereupon the Note shall be
and become due and payable, together with interest and all other amounts accrued
thereon (provided that if an Event of Default results from the filing of a
voluntary petition in any bankruptcy proceeding or the filing of an involuntary
petition in any bankruptcy proceeding which is not dismissed and discharged
within ninety days, the Note thereupon shall immediately become due and payable,
with interest accrued thereon, without any notice from the holder of the Note or
otherwise), and, the holder of the Note may take any action or proceeding at law
or in equity which it deems advisable for the protection of its interests to
collect and enforce payment of the Note, without presentment, demand, protest or
further notice of any kind, all of which are hereby expressly waived by Maker.

         10.      MISCELLANEOUS.

                  (a)      Except as otherwise expressly provided herein, all
notices and other communications provided for hereunder shall be in writing
(including telegraphic, telex, telefacsimile or cable communication) and mailed,
telegraphed, telexed, telecopied, cabled or delivered as follows: if to Maker,
at its address specified opposite its signature below; and if to Payee, at 1000
Alfred Nobel Drive, Hercules, CA 94547, Facsimile number (510) 741-5815,
Attention: Sanford Wadler, Esq.; or in each case at such other address as shall
be designated by Payee or Maker. All such notices and communications shall, when
mailed, telegraphed, telexed, telecopied or cabled or sent by overnight courier,
be effective when deposited in the mails, delivered to the telegraph company,
cable company or overnight courier, as the case may be, or sent by telex or
telecopier.

                  (b)      No failure or delay on the part of Payee or any other
holder of this Note to exercise any right, power or privilege under this Note
and no course of dealing between Maker and Payee shall impair such right, power
or privilege or operate as a waiver of any default or an acquiescence therein,
nor shall any single or partial exercise of any such right, power or privilege
preclude any other or further exercise thereof or the exercise of any other
right, power or privilege. The rights and remedies expressly provided in this
Note are cumulative to, and not exclusive of, any rights or remedies that Payee
would otherwise have. No notice to or demand on Maker in any case shall entitle
Maker to any other or further notice or demand in similar or other circumstances
or constitute a waiver of the right of Payee to any other or further action in
any circumstances without notice or demand.

                                                                         PAGE 15
<PAGE>

                  (c)      Maker and any endorser of this Note hereby consent to
renewals and extensions of time at or after the maturity hereof, without notice,
and hereby waive diligence, presentment, protest, demand and notice of every
kind and, to the full extent permitted by law, the right to plead any statute of
limitations as a defense to any demand hereunder.

                  (d)      If any provision in or obligation under this Note
shall be invalid, illegal or unenforceable in any jurisdiction, the validity,
legality and enforceability of the remaining provisions or obligations, or of
such provision or obligation in any other jurisdiction, shall not in any way be
affected or impaired thereby.

                  (e)      No past, present or future director, officer,
employee, or equity holder of Maker, as such, shall have any liability for any
obligations of Maker under this Note or for any claim based on, or in respect
of, or by reason of, such obligations or their creation. Payee waives and
releases all such liability, and such waiver and release are part of the
consideration for the issuance of this Note.

                  (f)      After all unpaid principal and interest owed on this
Note has been paid in full, this Note shall be surrendered to Maker for
cancellation and shall not be reissued.

                  (g)      If this Note shall become mutilated, destroyed, lost,
or stolen, upon the written request of Payee, Maker shall issue and deliver to
Payee, in replacement thereof, a new Note, in the same face amount and dated the
same date as the Note so mutilated, destroyed, lost, or stolen. If this Note has
become mutilated, such Note shall be surrendered to Maker for cancellation. If
this Note has been destroyed, lost, or stolen, Payee shall furnish to Maker such
security or indemnity as may be required by it to hold the Maker harmless for
the issuance of a new Note. Payee shall also advise as to the principal which
has been paid and the date to which interest has been paid on the Note. Maker
shall make a notation on each new Note of the amount of all payments of
principal previously made on the mutilated, destroyed, lost or stolen Note with
respect to which such new Note is issued and the date to which interest on such
old Note has been paid. Maker shall then distribute the new Note to Payee and,
in the case of a mutilated Note, cancel the original, mutilated Note.

                  (h)      Notwithstanding anything to the contrary contained
herein, no portion of this Note may be transferred to any Person in violation of
the provisions of federal or applicable state securities law or other applicable
law or if such transfer would result in such a violation of law.

                  (i)      THIS NOTE AND THE RIGHTS AND OBLIGATIONS OF MAKER AND
PAYEE HEREUNDER SHALL BE GOVERNED BY, AND SHALL

                                                                         PAGE 16
<PAGE>

BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF
CALIFORNIA, WITHOUT REGARD TO CONFLICTS OF LAWS PRINCIPLES.

                  (j)      ALL JUDICIAL PROCEEDINGS BROUGHT AGAINST MAKER
ARISING OUT OF OR RELATING TO THIS NOTE MAY BE BROUGHT IN ANY STATE OR FEDERAL
COURT OF COMPETENT JURISDICTION IN THE STATE OF CALIFORNIA, AND BY EXECUTION AND
DELIVERY OF THIS NOTE MAKER ACCEPTS FOR ITSELF AND IN CONNECTION WITH ITS
PROPERTIES, GENERALLY AND UNCONDITIONALLY, THE NONEXCLUSIVE JURISDICTION OF THE
AFORESAID COURTS AND WAIVES ANY DEFENSE OF FORUM NON CONVENIENS AND IRREVOCABLY
AGREES TO BE BOUND BY ANY JUDGMENT RENDERED THEREBY IN CONNECTION WITH THIS
NOTE. Maker hereby agrees that service of all process in any such proceeding in
any such court may be made by registered or certified mail, return receipt
requested, to Maker at its address set forth below its signature hereto, such
service being hereby acknowledged by Maker to be sufficient for personal
jurisdiction in any action against Maker in any such court and to be otherwise
effective and binding service in every respect. Nothing herein shall affect the
right to serve process in any other manner permitted by law or shall limit the
right of Payee to bring proceedings against Maker in the courts of any other
jurisdiction.

                  (k)      MAKER AND, BY ITS ACCEPTANCE OF THIS NOTE, PAYEE
HEREBY IRREVOCABLY AGREE TO WAIVE THEIR RESPECTIVE RIGHTS TO A JURY TRIAL OF ANY
CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF THIS NOTE OR ANY DEALINGS
BETWEEN THEM RELATING TO THE SUBJECT MATTER OF THIS NOTE AND THE LENDER/BORROWER
RELATIONSHIP THAT IS BEING ESTABLISHED. The scope of this waiver is intended to
be all-encompassing of any and all disputes that may be filed in any court and
that relate to the subject matter of this transaction, including without
limitation contract claims, tort claims, breach of duty claims and all other
common law and statutory claims. Maker and, by its acceptance of this Note,
Payee, each (i) acknowledges that this waiver is a material inducement to enter
into a business relationship, that each has already relied on this waiver in
entering into this relationship, and that each will continue to rely on this
waiver in their related future dealings and (ii) further warrants and represents
that each has reviewed this waiver with its legal counsel and that each
knowingly and voluntarily waives its jury trial rights following consultation
with legal counsel. THIS WAIVER IS IRREVOCABLE, MEANING THAT IT MAY NOT BE
MODIFIED EITHER ORALLY OR IN WRITING, AND THIS WAIVER SHALL APPLY TO ANY
SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS OR

                                                                         PAGE 17
<PAGE>

MODIFICATIONS OF THIS NOTE. In the event of litigation, this provision may be
filed as a written consent to a trial by the court.

         (l)      This Note is senior to the Series A Preferred Stock of Maker.

              [The remainder of this page intentionally left blank]

                                                                         PAGE 18
<PAGE>

         IN WITNESS WHEREOF, Maker has caused this Note to be executed and
delivered by its duly authorized officer as of the day and year and at the place
first above written.

                                    ACCENT SEMICONDUCTOR
                                    TECHNOLOGIES, INC.

                                    By: /s/ Bruce C. Rhine
                                       -----------------------------------------
                                       Name: Bruce C.  Rhine
                                       Title: President

                                       520 Clyde Avenue
                                       Mountain View, CA 94043
                                       Fax: (510) 623-8340
                                       Attention: President

                                                                         PAGE 19

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