Document:

<PAGE>

Exhibit 4.1                Subscription Agreement

                                  SUBSCRIPTION
                                    DOCUMENT

                               RIO VENTURES, INC.
================================================================================
Please read all instructions and the terms and conditions of your Private
Placement Memorandum carefully before filling out this application. If you need
assistance, please call Rio Ventures, Inc. at (949) 760-6832

|_|    When application is complete, mail your application and initial
       investment to:

                               RIO VENTURES, INC.
             C/O THE LAW OFFICES OF IWONA ALAMI, ESQ. TRUST ACCOUNT
                       120 NEWPORT CENTER DRIVE, SUITE 200
                             NEWPORT BEACH, CA 92660

|X|   Make Checks payable to Rio Ventures, Inc. Escrow / Iwona J. Alami Trust
      Account

                       I. ACCOUNT REGISTRATION - Check One
================================================================================

<TABLE>
<CAPTION>

<S>               <C>                             <C>                      <C>
|_| INDIVIDUAL    |_| JOINT REGISTRATION          |_| PENSION OR PROFIT    |_| CORPORATION, PARTNERSHIP, TRUST,
    ACCOUNT                                           SHARING                  ASSOCIATION OR OTHER ENTITY
                  |_| Joint Tenant with Right of      IRA
                  |_| Survivorship
                  |_| Tenants in Common
                  |_| Tenants by Entirety
                  |_| Community Property

--------------------------------------------------------------------------------
Name of APPLICANT, CUSTODIAN, CORPORATION, TRUST or BENEFICIARY
                                                                                |_|   PLEASE PUT A CHECK
NEXT TO
                            M or F                        -----------------------     THE SOC. SEC. # OR TAX
ID. #
                                                          Soc. Sec. or Tax ID #       RESPONSIBLE FOR TAXES.
WE
                                                                                      WILL REPORT THIS
NUMBER TO
                                                                                      THE IRS.

--------------------------------------------------------------------------------
Name of JOINT TENANT or TRUSTEE (IF APPLICABLE)
                                                                                   |-|
                            M or F       -------------    ------------------------
                                         Date of Birth    Soc. Sec. or Tax ID #

--------------------------------------------------------------------------------  -------------
Name of ADDITIONAL TRUSTEE (IF APPLICABLE)                                        Date of Trust

Marital Status (PLEASE CHECK ONE) |_| Single |_| Married |_| Separated |_|
Divorced

</TABLE>

__________________NUMBER OF SHARES

$________________ INVESTMENT AMOUNT   (Number of Shares X $0.03 per Share)

                                  HOME ADDRESS

--------------------------------------------------------------------------------
Street Address                                                       Unit Number

---------------------------------------------------    -----------  -----
City                                       State       ZIP+4

----------------------------------        --------------------------------------
Home Phone Number (with Area Code)        Business Phone Number (with Area Code)

                                BUSINESS ADDRESS

--------------------------------------------------------------------------------
Name of Company

--------------------------------------------------------------------------------
Street Address                                          Suite Number

------------------------------------------------  -----------  ----
City                                    State     ZIP+4

                                        1

<PAGE>

                    II. ALTERNATIVE DISTRIBUTION INFORMATION
================================================================================
To direct distributions to a party other than the registered owner, complete the
information below.

Name of Firm (Bank or Brokerage):
                                  ----------------------------------------------
Account Name:
              ------------------------------------------------------------------
Account Number:
                ----------------------------------------------------------------
Address:
         -----------------------------------------------------------------------
City, State ZIP:
                 ---------------------------------------------------------------

                           III. SUBSCRIPTION DOCUMENT
================================================================================
    You as an individual or you on behalf of the subscribing entity are being
asked to complete this Subscription Document so a determination can be made as
to whether or not you (it) are qualified to purchase Shares under applicable
federal and state securities laws.
    YOUR ANSWERS TO THE QUESTIONS CONTAINED HEREIN MUST BE TRUE AND CORRECT IN
ALL RESPECTS, AND A FALSE REPRESENTATION BY YOU MAY CONSTITUTE A VIOLATION OF
LAW FOR WHICH A CLAIM FOR DAMAGES MAY BE MADE AGAINST YOU.
    Your answers will be kept strictly confidential; however, by signing this
Subscription Document, you will be authorizing the Company to present a
completed copy of this Subscription Document to such parties as they may deem
appropriate in order to make certain that the offer and sale of the Shares will
not result in a violation of the Securities Act of 1933, as amended, or of the
securities laws of any state.
    This Subscription Document does not constitute an offer to sell or a
    solicitation of an offer to buy Shares or any other security.
    ALL QUESTIONS MUST BE ANSWERED. If the appropriate answer is "None" or "Not
Applicable", please state so. Please print or type your answers to all questions
and attach additional sheets if necessary to complete your answers to any item.
Please initial any correction.

--------------------------------------------------------------------------------

INDIVIDUAL SUBSCRIBERS:
If the Shares subscribed for are to be owned by more than one person, YOU AND
THE OTHER CO-SUBSCRIBER MUST EACH COMPLETE A SEPARATE SUBSCRIPTION DOCUMENT
(EXCEPT IF THE CO-SUBSCRIBER IS YOUR SPOUSE) AND SIGN THE SIGNATURE PAGE ANNEXED
HERETO. IF YOUR SPOUSE IS A CO-SUBSCRIBER, YOU MUST INDICATE THEIR NAME AND
SOCIAL SECURITY NUMBER.

CORPORATIONS, PARTNERSHIPS, PENSION PLANS AND TRUSTS:
The information requested herein relates to the subscribing entity and not to
you personally (unless otherwise determined in the ACCREDITED INVESTOR STATUS
section).

                         IV. ACCREDITED INVESTOR STATUS
================================================================================
         IF YOU MEET ANY OF THE FOLLOWING TESTS, PLEASE CHECK THE APPROPRIATE
SPACES BELOW.

I.  INDIVIDUAL ACCOUNTS
    I certify that I am an "accredited investor" because:
    A.   _______ I had an individual income of more than $200,000 in each of the
         two most recent calendar years, and I reasonably expect to have an
         individual income in excess of $200,000 in the current calendar year;
         or my spouse and I had joint income in excess of $300,000 in each of
         the two most recent calendar years, and we reasonably expect to have a
         joint income in excess of $300,000 in the current calendar year.

    B.   _______ I have an individual net worth, or my spouse and I have a joint
         net worth, in excess of $1,000,000 (including home and personal
         property).

    For purposes of this Subscription Document, "individual income" means
"adjusted gross income" as reported for Federal income tax purposes, exclusive
of any income attributable to a spouse or to property owned by a spouse: (i) the
amount of any interest income received which is tax-exempt under Section 103 of
the Internal Revenue Code of 1986, as amended, (the "Code"), (ii) the amount of
losses claimed as a limited partner in a limited partnership (as reported on
Schedule E of form 1040), (iii) any deduction claimed for depletion under
Section 611 et seq. of the Code and (iv) any amount by which income from
long-term capital gains has been reduced in arriving at adjusted gross income
pursuant to the provisions of Sections 1202 of the Internal Revenue Code as it
was in effect prior to enactment of the Tax Reform Act of 1986.
    For purposes of this Subscription Document, "joint income" means, "adjusted
gross income," as reported for Federal income tax purposes, including any income
attributable to a spouse or to property owned by a spouse, and increased by the
following amounts: (i) the amount of any interest income received which is
tax-exempt under Section 103 of the Internal Revenue Code of 1986, as amended
(the "Code"), (ii) the amount of losses claimed as a limited partner in a
limited partnership (as reported on Schedule E of Form 1040), (iii) any
deduction claimed for depletion under Section 611 et seq. of the Code and (iv)
any amount by which income from long-term capital gains has been reduced in
arriving at adjusted gross income pursuant to the provisions of Section 1202 of
the Internal Revenue Code as it was in effect prior to enactment of the Tax
Reform Act of 1986.
    For purposes of this Subscription Document, "joint income" means "adjusted
gross income," as reported for Federal income tax purposes, including any income
attributable to a spouse or to property owned by a spouse, and increased by the
following amounts: (i) the amount of any interest income received which is
tax-exempt under Section 103 of the Internal Revenue Code of 1986, as amended
(the "Code"), (ii) the amount of losses claimed as a limited partner in a
limited partnership (as reported on Schedule E of Form 1040), (iii) any
deduction claimed for depletion under Section 611 et seq. of the Code and (iv)
any amount by which income from long-term capital gains has been reduced in
arriving at adjusted gross income pursuant to the provisions of Section 1202 of
the Internal Revenue Code as it was in effect prior to enactment of the Tax
Reform Act of 1986.
    For the purposes of the Subscription Document, "net worth" means (except as
otherwise specifically defined) the excess of total assets at fair market value,
including home and personal property, over total liabilities, including
mortgages and income taxes on unrealized appreciation of assets.

II. CORPORATIONS, PARTNERSHIPS, EMPLOYEE BENEFIT PLANS OR IRAS

    A. Has the subscribing entity been formed for the specific purpose of
investing in the Shares? |_| YES |_| NO

If your answer to question A is "No" CHECK whichever of the following statements
(1-5) is applicable to the subscribing entity. If your answer to question A is
"Yes" the subscribing entity must be able to certify to statement (B) below in
order to qualify as an "accredited investor".

                                        2

<PAGE>

                    ACCREDITED INVESTOR STATUS - (continued)
================================================================================
         The undersigned entity certifies that it is an "accredited investor"
because it is:
    1. _______ an employee benefit plan within the meaning of Title I of the
    Employee Retirement Income Security Act of 1974, provided that the
    investment decision is made by a plan fiduciary, as defined in section 3(21)
    of such Act, and the plan fiduciary is a bank, savings and loan association,
    insurance company or registered investment adviser; OR 2. _______ an
    employee benefit plan within the meaning of Title I of the Employee
    Retirement Income Security Act of 1974 that has total assets in excess of
    $5,000,000; OR 3. _______ each of its shareholders, partners, or
    beneficiaries meets at least one of the following conditions described above
    under INDIVIDUAL ACCREDITED INVESTOR STATUS. Please also CHECK the
    appropriate space in that section; OR (NOTE: INCOME STATEMENT MUST BE
    COMPLETED FOR EACH SHAREHOLDER, PARTNER OR BENEFICIARY) 4. _______ the plan
    is a self directed employee benefit plan and the investment decision is made
    solely by a person that meets at least one of the conditions described above
    under INDIVIDUAL ACCREDITED INVESTOR STATUS; OR (NOTE: INCOME STATEMENT MUST
    BE COMPLETED FOR EACH SHAREHOLDER, PARTNER OR BENEFICIARY) 5. _______ a
    corporation, a partnership or a Massachusetts or similar business trust with
    total assets in excess of $5,000,000.

B.  If the answer to Question A above is "Yes", please certify the statement
    below is true and correct:
        _______ The undersigned entity certifies that it is an accredited
        investor because each of its shareholder or beneficiaries meets at least
        one of the following conditions described above under INDIVIDUAL
        ACCREDITED INVESTOR STATUS. Please also CHECK the appropriate space in
        that section.

III.TRUST ACCOUNTS

A. Has the subscribing entity been formed for the specific purpose of investing
in the Shares? YES |_| NO |_|

If your answer to question A is "No" CHECK whichever of the following statements
(1-3) is applicable to the subscribing entity. If your answer to question A is
"Yes" the subscribing entity must be able to certify to the statement (3) below
in order to qualify as an "accredited investor".

         The undersigned trustee certifies that the trust is an "accredited
investor" because:
    _______1) the trust has total assets in excess of $5,000,000 and the
    investment decision has been made by a "sophisticated person"; OR _______2)
    the trustee making the investment decision on its behalf is a bank (as
    defined in Section 3(a)(2) of the Act), a saving and loan association or
    other institution as defined in Section 3(a)(5)(A) of the Securities Act,
    acting in its fiduciary capacity; OR _______3) the undersigned trustee
    certifies that the trust is an accredited investor because the grantor(s) of
    the trust may revoke the trust at any time and regain title to the trust
    assets and has (have) retained sole investment control over the assets of
    the trust and the (each) grantor(s) meets at least one of the following
    conditions described above under INDIVIDUAL ACCREDITED INVESTOR STATUS.
    Please also CHECK the appropriate space in that section. _______4) the
    undersigned trustee certifies that the trust is an accredited investor
    because all of the beneficial owners of the trust are accredited investors
    (NOTE: FOR EACH GRANTOR AN INCOME STATEMENT MUST BE COMPLETED)

             V. INCOME STATEMENT - (Round off to the nearest $5,000)
================================================================================
<TABLE>
<CAPTION>

<S>                                <C>            <C>       <C>       <C>             <C>             <C>
Please specify the amount of your: |_| Individual |_| Joint |_| Trust |_| Beneficiary |_| Shareholder |_| Partner income
(defined in page 2: Accredited Investor Status) in calendar years 1998 and 1999 and your projected income for 2000.

         1998           $_________________________
         1999           $_________________________
         2000           $_________________________(projected)

Current occupation (position or title and duties):

Name of Business:
                   -----------------------------------

Name of Employer:                                     Telephone number (       )               -
                   -----------------------------------                  -------  -------------- -------

Former employment (if current employment is less than five years):

Name of Employer:                                     Position or Title:
                  ------------------------------------                   ------------------------------

Nature of Duties:                                     Period Employed:                      to
                  ------------------------------------                 --------------------    --------
</TABLE>

                                        3

<PAGE>

                            VI. INVESTMENT EXPERIENCE
================================================================================
The following information is to be provided by the individual making the
investment decision or the person acting on behalf of the corporation,
partnership, individual retirement account, employee benefit plan or trust.

1.  Business or professional education (school, dates of attendance, degrees):

--------------------------------------------------------------------------------
2.  Details of any training or experience in financial, business or tax matters
    not disclosed in Item 1 immediately above:

--------------------------------------------------------------------------------
3.  Please indicate the frequency of your investment in marketable securities:
    |_| Often       |_| Occasionally       |_| Seldom        |_| Never

4.  Please state the approximate number and total dollar amount of the following
    types of investments in which you have participated:
    a.  restricted (non-traded) stock or notes:
        Number ___________________      Amount Invested:   $ ___________________
    b.  private placements of securities sold in reliance upon non-public
        offering exemption from registration under the Securities Act of 1933:
        Number ___________________      Amount Invested:   $ ___________________
5.  Please initial the appropriate alternative:
_______ ALTERNATIVE ONE: I have such knowledge and experience in financial and
business matters and in private placement investments in particular that I am
capable of evaluating the merits and risks of an investment in the Shares and do
not desire to use a purchaser representative in connection with evaluating such
merits and risks. I understand, however, that the Company may request that I use
a purchaser representative.
_______ ALTERNATIVE TWO: I intend to use the services of a purchaser
representative(s) in connection with evaluating the merits and risks of an
investment in the securities and hereby appoint such person(s) to act as my
purchaser representative(s) in connection with my proposed purchase of Shares.
(PLEASE CONTACT THE COMPANY FOR FURTHER INSTRUCTIONS.)

Name of Purchaser Representative If Alternative Two chosen:

                                 Telephone number (    )             -
---------------------------------                  ----  ------------ --------

                                 VII. SIGNATURES
================================================================================
I AGREE TO BE BOUND BY ALL OF THE TERMS AND CONDITIONS OF THIS SUBSCRIPTION
DOCUMENT.

Dated                                                       2000
      ----------------------------------------------------

Print name of individual subscriber, custodian, corporation, trustee Signature
of individual subscriber, authorized person, trustee exactly as you would like
your certificates issued

<TABLE>
<CAPTION>
<S>                                              <C>

-----------------------------------------------  ----------------------------------------------
Print name of co-subscriber, authorized person, Signature of co-subscriber,
authorized person, co-trustee if required by trust instrument co-trustee if
required by trust instrument

-----------------------------------------------  ----------------------------------------------
INVESTMENT AUTHORIZATION. The undersigned corporation, partnership, benefit plan
or IRA has all requisite authority to acquire the Shares hereby subscribed for
and to enter into the Subscription Document, and further, the undersigned
officer, partner or fiduciary of the subscribing entity has been duly authorized
by all requisite action on the part of such entity to execute these documents on
its behalf. Such authorization has not been revoked and is still in full force
and effect.
Check Box:      |_|   Yes         |_|    No         |_|    Not Applicable

</TABLE>
                                        4<PAGE>   1
                                                                    EXHIBIT 10.1

                        ADVANCED ENERGY INDUSTRIES, INC.
                             1995 STOCK OPTION PLAN

                              ADOPTED JUNE 6, 1993
                   AS AMENDED AND RESTATED SEPTEMBER 20, 1995
           AND AS FURTHER AMENDED FEBRUARY 10, 1998, FEBRUARY 9, 1999,
                     DECEMBER 13, 2000 AND FEBRUARY 7, 2001

1.       PURPOSES.

(a) The purpose of the Plan is to provide a means by which selected Employees
and Directors of and Consultants to the Company, and its Affiliates, may be
given an opportunity to purchase stock of the Company.

(b) The Company, by means of the Plan, seeks to retain the services of persons
who are now Employees or Directors of or Consultants to the Company or its
Affiliates, to secure and retain the services of new Employees, Directors and
Consultants, and to provide incentives for such persons to exert maximum efforts
for the success of the Company and its Affiliates.

(c) The Company intends that the Options issued under the Plan shall, in the
discretion of the Board or any Committee to which responsibility for
administration of the Plan has been delegated pursuant to subsection 3(c), be
either Incentive Stock Options or Nonstatutory Stock Options. All Options shall
be separately designated Incentive Stock Options or Nonstatutory Stock Options
at the time of grant, and in such form as issued pursuant to Section 6, and a
separate certificate or certificates will be issued for shares purchased on
exercise of each type of Option.

2.       DEFINITIONS.

(a) "AFFILIATE" means any parent corporation or subsidiary corporation, whether
now or hereafter existing, as those terms are defined in Sections 424(e) and (f)
respectively, of the Code.

(b) "BOARD" means the Board of Directors of the Company.

(c) "CODE" means the Internal Revenue Code of 1986, as amended.

(d) "COMMITTEE" means a Committee appointed by the Board in accordance with
subsection 3(c) of the Plan.

(e) "COMPANY" means Advanced Energy Industries, Inc., a Delaware corporation.

(f) "CONSULTANT" means any person, including an advisor, engaged by the Company
or an Affiliate to render consulting services and who is compensated for such
services, provided that the term "Consultant" shall not include Directors who
are paid only a director's fee by the Company or who are not compensated by the
Company for their services as Directors.

                                      -1-
<PAGE>   2

(g) "CONTINUOUS STATUS AS AN EMPLOYEE, DIRECTOR OR CONSULTANT" means the
employment or relationship as a Director or Consultant is not interrupted or
terminated. The Board, in its sole discretion, may determine whether Continuous
Status as an Employee, Director or Consultant shall be considered interrupted in
the case of: (i) any leave of absence approved by the Board, including sick
leave, military leave, or any other personal leave; or (ii) transfers between
locations of the Company or between the Company, Affiliates or their successors.

(h) "COVERED EMPLOYEE" means the Chief Executive Officer and the four (4) other
highest compensated officers of the Company.

(i) "DIRECTOR" means a member of the Board.

(j) "DISINTERESTED PERSON" means a Director who either (i) was not during the
one year prior to service as an administrator of the Plan granted or awarded
equity securities pursuant to the Plan or any other plan of the Company or any
of its affiliates entitling the participants therein to acquire equity
securities of the Company or any of its affiliates except as permitted by Rule
16b-3(c)(2)(i); or (ii) is otherwise considered to be a "disinterested person"
in accordance with Rule 16b-3(c)(2)(i), or any other applicable rules,
regulations or interpretations of the Securities and Exchange Commission.

(k) "EMPLOYEE" means any person, including Officers and Directors, employed by
the Company or any Affiliate of the Company. Neither service as a Director nor
payment of a director's fee by the Company shall be sufficient to constitute
"employment" by the Company.

(1) "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

(m) "FAIR MARKET VALUE" means the value of the common stock as determined in
good faith by the Board and in a manner consistent with Section 260.140.50 of
Title 10 of the California Code of Regulations.

(n) "INCENTIVE STOCK OPTION" means an Option intended to qualify as an incentive
stock option within the meaning of Section 422 of the Code and the regulations
promulgated thereunder.

(o) "NONSTATUTORY STOCK OPTION" means an Option not intended to qualify as an
Incentive Stock Option.

(p) "OFFICER" means a person who is an officer of the Company within the meaning
of Section 16 of the Exchange Act and the rules and regulations promulgated
thereunder.

(q) "OPTION" means a stock option granted pursuant to the Plan.

(r) "OPTION AGREEMENT" means a written agreement between the Company and an
Optionee evidencing the terms and conditions of an individual Option grant. Each
Option Agreement shall be subject to the terms and conditions of the Plan.

(s) "OPTIONEE" means an Employee, Director or Consultant who holds an
outstanding Option.

                                      -2-
<PAGE>   3

(t) "OUTSIDE DIRECTOR" means a Director who either (i) is not a current employee
of the Company or an "affiliated corporation" (as defined in the Treasury
regulations promulgated under Section 162(m) of the Code), is not a former
employee of the Company or an affiliated corporation receiving compensation for
prior services (other than benefits under a tax qualified pension plan), was not
an officer of the Company or an affiliated corporation at any time, and is not
currently receiving compensation for personal services in any capacity other
than as a Director, or (ii) is otherwise considered an "outside director" for
purposes of Section 162(m) of the Code.

(u) "PLAN" means this 1995 Stock Option Plan.

(v) "RULE 16b-3" means Rule 16b-3 of the Exchange Act or any successor to Rule
16b-3, as in effect when discretion is being exercised with respect to the Plan.

3.       ADMINISTRATION.

(a) The Plan shall be administered by the Board unless and until the Board
delegates administration to a Committee, as provided in subsection 3(c).

(b) The Board shall have the power, subject to, and within the limitations of,
the express provisions of the Plan:

         (1) To determine from time to time which of the persons eligible under
         the Plan shall be granted Options; when and how each Option shall be
         granted; whether an Option will be an Incentive Stock Option or a
         Nonstatutory Stock Option; the provisions of each Option granted (which
         need not be identical), including the time or times such Option may be
         exercised in whole or in part; and the number of shares for which an
         Option shall be granted to each such person.

         (2) To construe and interpret the Plan and Options granted under it,
         and to establish, amend and revoke rules and regulations for its
         administration. The Board, in the exercise of this power, may correct
         any defect, omission or inconsistency in the Plan or in any Option
         Agreement, in a manner and to the extent it shall deem necessary or
         expedient to make the Plan fully effective.

         (3) To amend the Plan as provided in Section 11.

(c) The Board may delegate administration of the Plan to a committee composed of
not fewer than two (2) members (the "Committee"), all of the members of which
Committee shall be Disinterested Persons and may also be, in the discretion of
the Board, Outside Directors. If administration is delegated to a Committee, the
Committee shall have, in connection with the administration of the Plan, the
powers theretofore possessed by the Board (and references in this Plan to the
Board shall thereafter be to the Committee), subject, however, to such
resolutions, not inconsistent with the provisions of the Plan, as may be adopted
from time to time by the Board. The Board may abolish the Committee at any time
and revest in the Board the administration of the Plan. Additionally, prior to
the date of the first registration of an equity security of the Company under
Section 12 of the Exchange Act, and notwithstanding anything to the contrary
contained herein, the Board may delegate administration of the Plan to any
person or persons and

                                      -3-
<PAGE>   4

the term "Committee" shall apply to any person or persons to whom such authority
has been delegated. Notwithstanding anything in this Section 3 to the contrary,
the Board or the Committee may delegate to a committee of one or more members of
the Board the authority to grant Options to eligible persons who (1) are not
then subject to Section 16 of the Exchange Act and/or (2) are either (i) not
then Covered Employees and are not expected to be Covered Employees at the time
of recognition of income resulting from such Option, or (ii) not persons with
respect to whom the Company wishes to comply with Section 162(m) of the Code.

(d) Any requirement that an administrator of the Plan be a Disinterested Person
shall not apply (i) prior to the date of the first registration of an equity
security of the Company under Section 12 of the Exchange Act, or (ii) if the
Board or the Committee expressly declares that such requirement shall not apply.
Any Disinterested Person shall otherwise comply with the requirements of Rule
16b-3.

4.       SHARES SUBJECT TO THE PLAN.

(a) Subject to the provisions of Section 10 relating to adjustments upon changes
in stock, the stock that may be sold pursuant to Options shall not exceed in the
aggregate eight million one hundred twenty-five thousand (8,125,000) shares of
the Company's common stock. If any Option shall for any reason expire or
otherwise terminate, in whole or in part, without having been exercised in full,
the stock not purchased under such Option shall revert to and again become
available for issuance under the Plan.

(b) The stock subject to the Plan may be unissued shares or reacquired shares,
bought on the market or otherwise.

5.       ELIGIBILITY.

(a) Incentive Stock Options may be granted only to Employees. Nonstatutory Stock
Options may be granted only to Employees, Directors or Consultants.

(b) A Director shall in no event be eligible for the benefits of the Plan unless
at the time discretion is exercised in the selection of the Director as a person
to whom Options may be granted, or in the determination of the number of shares
which may be covered by Options granted to the Director: (i) the Board has
delegated its discretionary authority over the Plan to a Committee which
consists solely of Disinterested Persons; or (ii) the Plan otherwise complies
with the requirements of Rule 16b-3. The Board shall otherwise comply with the
requirements of Rule 16b-3. This subsection 5(b) shall not apply (i) prior to
the date of the first registration of an equity security of the Company under
Section 12 of the Exchange Act, or (ii) if the Board or Committee expressly
declares that it shall not apply.

(c) No person shall be eligible for the grant of an Option if, at the time of
grant, such person owns (or is deemed to own pursuant to Section 424(d) of the
Code) stock possessing more than ten percent (10%) of the total combined voting
power of all classes of stock of the Company or of any of its Affiliates unless
the exercise price of such Option is at least one hundred ten percent (110%) of
the Fair Market Value of such stock at the date of grant and the Option is not
exercisable after the expiration of five (5) years from the date of grant.

                                      -4-
<PAGE>   5

(d) Subject to the provisions of Section 10 relating to adjustments upon changes
in stock, no person shall be eligible to be granted Options covering more than
three hundred thousand (300,000) shares of the Company's common stock in any
calendar year.

6.       OPTION PROVISIONS.

Each Option shall be in such form and shall contain such terms and conditions as
the Board shall deem appropriate. The provisions of separate Options need not be
identical, but each Option shall include (through incorporation of provisions
hereof by reference in the Option or otherwise) the substance of each of the
following provisions:

(a) TERM. No Option shall be exercisable after the expiration of ten (10) years
from the date it was granted.

(b) PRICE. The exercise price of each Incentive Stock Option shall be not less
than one hundred percent (100%) of the Fair Market Value of the stock subject to
the Option on the date the Option is granted. The exercise price of each
Nonstatutory Stock Option shall be not less than eighty-five percent (85%) of
the Fair Market Value of the stock subject to the Option on the date the Option
is granted.

(c) CONSIDERATION. The purchase price of stock acquired pursuant to an Option
shall be paid, to the extent permitted by applicable statutes and regulations,
either (i) in cash at the time the Option is exercised, or (ii) at the
discretion of the Board or the Committee, either at the time of the grant or
exercise of the Option, (A) by delivery to the Company of other common stock of
the Company, (B) according to a deferred payment or other arrangement (which may
include, without limiting the generality of the foregoing, the use of other
common stock of the Company) with the person to whom the Option is granted or to
whom the Option is transferred pursuant to subsection 6(d), or (C) in any other
form of legal consideration that may be acceptable to the Board.

In the case of any deferred payment arrangement, interest shall be payable at
least annually and shall be charged at the minimum rate of interest necessary to
avoid the treatment as interest, under any applicable provisions of the Code, of
any amounts other than amounts stated to be interest under the deferred payment
arrangement.

(d) TRANSFERABILITY. An Incentive Stock Option shall not be transferable except
by will or by the laws of descent and distribution, and shall be exercisable
during the lifetime of the person to whom the Incentive Stock Option is granted
only by such person. A Nonstatutory Stock Option shall not be transferable
except by will or by the laws of descent and distribution or pursuant to a
qualified domestic relations order satisfying the requirements of Rule 16b-3 and
the rules thereunder (a "QDRO"), and shall be exercisable during the lifetime of
the person to whom the Option is granted only by such person or any transferee
pursuant to a QDRO. The person to whom the Option is granted may, by delivering
written notice to the Company, in a form satisfactory to the Company, designate
a third party who, in the event of the death of the Optionee, shall thereafter
be entitled to exercise the Option.

(e) VESTING. The total number of shares of stock subject to an Option may, but
need not, be allotted in periodic installments (which may, but need not, be
equal). The Option Agreement may provide that from time to time during each of
such installment periods, the Option may become

                                      -5-
<PAGE>   6

exercisable ("vest") with respect to some or all of the shares allotted to that
period, and may be exercised with respect to some or all of the shares allotted
to such period and/or any prior period as to which the Option became vested but
was not fully exercised. The Option may be subject to such other terms and
conditions on the time or times when it may be exercised (which may be based on
performance or other criteria) as the Board may deem appropriate. The vesting
provisions of individual Options may vary but in each case will provide for
vesting of at least twenty percent (20%) per year of the total number of shares
subject to the Option. The provisions of this subsection 6(e) are subject to any
Option provisions governing the minimum number of shares as to which an Option
may be exercised.

(f) SECURITIES LAW COMPLIANCE. The Company may require any Optionee, or any
person to whom an Option is transferred under subsection 6(d), as a condition of
exercising any such Option, (1) to give written assurances satisfactory to the
Company as to the Optionee's knowledge and experience in financial and business
matters and/or to employ a purchaser representative reasonably satisfactory to
the Company who is knowledgeable and experienced in financial and business
matters, and that he or she is capable of evaluating, alone or together with the
purchaser representative, the merits and risks of exercising the Option; and (2)
to give written assurances satisfactory to the Company stating that such person
is acquiring the stock subject to the Option for such person's own account and
not with any present intention of selling or otherwise distributing the stock.
The foregoing requirements, and any assurances given pursuant to such
requirements, shall be inoperative if (i) the issuance of the shares upon the
exercise of the Option has been registered under a then currently effective
registration statement under the Securities Act of 1933, as amended (the
"Securities Act"), or (ii) as to any particular requirement, a determination is
made by counsel for the Company that such requirement need not be met in the
circumstances under the then applicable securities laws. The Company may, upon
advice of counsel to the Company, place legends on stock certificates issued
under the Plan as such counsel deems necessary or appropriate in order to comply
with applicable securities laws, including, but not limited to, legends
restricting the transfer of the stock.

(g) TERMINATION OF EMPLOYMENT OR RELATIONSHIP AS A DIRECTOR OR CONSULTANT. In
the event an Optionee's Continuous Status as an Employee, Director or Consultant
terminates (other than upon the Optionee's death or disability), the Optionee
may exercise his or her Option (to the extent that the Optionee was entitled to
exercise it at the date of termination) but only within such period of time
ending on the earlier of (i) the date three (3) months after the termination of
the Optionee's Continuous Status as an Employee, Director or Consultant (or such
longer or shorter period, which in no event shall be less than thirty (30) days,
specified in the Option Agreement), or (ii) the expiration of the term of the
Option as set forth in the Option Agreement. If, after termination, the Optionee
does not exercise his or her Option within the time specified in the Option
Agreement, the Option shall terminate, and the shares covered by such Option
shall revert to and again become available for issuance under the Plan.

(h) DISABILITY OF OPTIONEE. In the event an Optionee's Continuous Status as an
Employee, Director or Consultant terminates as a result of the Optionee's
disability, the Optionee may exercise his or her Option (to the extent that the
Optionee was entitled to exercise it at the date of termination), but only
within such period of time ending on the earlier of (i) the date twelve (12)
months following such termination (or such longer or shorter period, which in no
event shall be less than six (6) months, specified in the Option Agreement), or
(ii) the expiration of the term of

                                      -6-
<PAGE>   7

the Option as set forth in the Option Agreement. If, at the date of termination,
the Optionee is not entitled to exercise his or her entire Option, the shares
covered by the unexercisable portion of the Option shall revert to and again
become available for issuance under the Plan. If, after termination, the
Optionee does not exercise his or her Option within the time specified herein,
the Option shall terminate, and the shares covered by such Option shall revert
to and again become available for issuance under the Plan.

(i) DEATH OF OPTIONEE. In the event of the death of an Optionee during, or
within a period specified in the Option after the termination of, the Optionee's
Continuous Status as an Employee, Director or Consultant, the Option may be
exercised (to the extent the Optionee was entitled to exercise the Option at the
date of death) by the Optionee's estate, by a person who acquired the right to
exercise the Option by bequest or inheritance or by a person designated to
exercise the option upon the Optionee's death pursuant to subsection 6(d), but
only within the period ending on the earlier of (i) the date eighteen (18)
months following the date of death (or such longer or shorter period, which in
no event shall be less than six (6) months, specified in the Option Agreement),
or (ii) the expiration of the term of such Option as set forth in the Option
Agreement. If, at the time of death, the Optionee was not entitled to exercise
his or her entire Option, the shares covered by the unexercisable portion of the
Option shall revert to and again become available for issuance under the Plan.
If, after death, the Option is not exercised within the time specified herein,
the Option shall terminate, and the shares covered by such Option shall revert
to and again become available for issuance under the Plan.

(j) EARLY EXERCISE. The Option may, but need not, include a provision whereby
the Optionee may elect at any time while an Employee, Director or Consultant to
exercise the Option as to any part or all of the shares subject to the Option
prior to the full vesting of the Option. Any unvested shares so purchased shall
be subject to a repurchase right in favor of the Company, with the repurchase
price to be equal to the original purchase price of the stock, or to any other
restriction the Board determines to be appropriate; provided, however, that (i)
the right to repurchase at the original purchase price shall lapse at a minimum
rate of twenty percent (20%) per year over five (5) years from the date the
Option was granted, and (ii) such right shall be exercisable only within (A) the
ninety (90) day period following the termination of employment or the
relationship as a Director or Consultant, or (B) such longer period as may be
agreed to by the Company and the Optionee (for example, for purposes of
satisfying the requirements of Section 1202(c)(3) of the Code (regarding
"qualified small business stock")), and (iii) such right shall be exercisable
only for cash or cancellation of purchase money indebtedness for the shares.
Should the right of repurchase be assigned by the Company, the assignee shall
pay the Company cash equal to the difference between the original purchase price
and the stock's Fair Market Value if the original purchase price is less than
the stock's Fair Market Value.

(k) WITHHOLDING. To the extent provided by the terms of an Option Agreement, the
Optionee may satisfy any federal, state or local tax withholding obligation
relating to the exercise of such Option by any of the following means or by a
combination of such means: (1) tendering a cash payment; (2) authorizing the
Company to withhold shares from the shares of the common stock otherwise
issuable to the participant as a result of the exercise of the Option; or (3)
delivering to the Company owned and unencumbered shares of the common stock of
the Company.

                                      -7-
<PAGE>   8

7.       COVENANTS OF THE COMPANY.

(a) During the terms of the Options, the Company shall keep available at all
times the number of shares of stock required to satisfy such Options.

(b) The Company shall seek to obtain from each regulatory commission or agency
having jurisdiction over the Plan such authority as may be required to issue and
sell shares of stock upon exercise of the Options; provided, however, that this
undertaking shall not require the Company to register under the Securities Act
either the Plan, any Option or any stock issued or issuable pursuant to any such
Option. If, after reasonable efforts, the Company is unable to obtain from any
such regulatory commission or agency the authority which counsel for the Company
deems necessary for the lawful issuance and sale of stock under the Plan, the
Company shall be relieved from any liability for failure to issue and sell stock
upon exercise of such Options unless and until such authority is obtained.

8.       USE OF PROCEEDS FROM STOCK.

Proceeds from the sale of stock pursuant to Options shall constitute general
funds of the Company.

9.       MISCELLANEOUS.

(a) Neither an Optionee nor any person to whom an Option is transferred under
subsection 6(d) shall be deemed to be the holder of, or to have any of the
rights of a holder with respect to, any shares subject to such Option unless and
until such person has satisfied all requirements for exercise of the Option
pursuant to its terms.

(b) Throughout the term of any Option, the Company shall deliver to the holder
of such Option, not later than one hundred twenty (120) days after the close of
each of the Company's fiscal years during the Option term, a balance sheet and
an income statement. This section shall not apply when issuance is limited to
key employees whose duties in connection with the Company assure them access to
equivalent information.

(c) Nothing in the Plan or any instrument executed or Option granted pursuant
thereto shall confer upon any Employee, Director, Consultant or Optionee any
right to continue in the employ of the Company or any Affiliate or to continue
acting as a Director or Consultant or shall affect the right of the Company or
any Affiliate to terminate the employment or relationship as a Director or
Consultant of any Employee, Director, Consultant or Optionee with or without
cause.

(d) To the extent that the aggregate Fair Market Value (determined at the time
of grant) of stock with respect to which Incentive Stock Options granted after
1986 are exercisable for the first time by any Optionee during any calendar year
under all plans of the Company and its Affiliates exceeds one hundred thousand
dollars ($100,000), the Options or portions thereof which exceed such limit
(according to the order in which they were granted) shall be treated as
Nonstatutory Stock Options.

                                      -8-
<PAGE>   9

10.      ADJUSTMENTS UPON CHANGES IN STOCK.

(a) If any change is made in the stock subject to the Plan, or subject to any
Option (through merger, consolidation, reorganization, recapitalization, stock
dividend, dividend in property other than cash, stock split, liquidating
dividend, combination of shares, exchange of shares, change in corporate
structure or otherwise), the Plan will be appropriately adjusted in the
class(es) and maximum number of shares subject to the Plan pursuant to
subsection 4(a) and the maximum number of shares subject to award to any person
during any calendar year pursuant to subsection 5(d), and the outstanding
Options will be appropriately adjusted in the class(es) and number of shares and
price per share of stock subject to such outstanding Options.

(b) In the event of: (1) a merger or consolidation in which the Company is not
the surviving corporation or (2) a reverse merger in which the Company is the
surviving corporation but the shares of the Company's common stock outstanding
immediately preceding the merger are converted by virtue of the merger into
other property, whether in the form of securities, cash or otherwise then to the
extent permitted by applicable law: (i) any surviving corporation shall assume
any Options outstanding under the Plan or shall substitute similar Options for
those outstanding under the Plan, or (ii) such Options shall continue in full
force and effect. In the event any surviving corporation refuses to assume or
continue such Options, or to substitute similar options for those outstanding
under the Plan, then such Options shall be terminated if not exercised prior to
such event. In the event of a dissolution or liquidation of the Company, any
Options outstanding under the Plan shall terminate if not exercised prior to
such event.

11.      AMENDMENT OF THE PLAN.

(a) The Board at any time, and from time to time, may amend the Plan. However,
except as provided in Section 10 relating to adjustments upon changes in stock,
no amendment shall be effective unless approved by the stockholders of the
Company within twelve (12) months before or after the adoption of the amendment,
where the amendment will:

         (1) Increase the number of shares reserved for Options under the Plan;

         (2) Modify the requirements as to eligibility for participation in the
         Plan (to the extent such modification requires stockholder approval in
         order for the Plan to satisfy the requirements of Section 422 of the
         Code); or

         (3) Modify the Plan in any other way if such modification requires
         stockholder approval in order for the Plan to satisfy the requirements
         of Section 422 of the Code or to comply with the requirements of Rule
         16b-3.

(b) The Board may in its sole discretion submit any other amendment to the Plan
for stockholder approval, including, but not limited to, amendments to the Plan
intended to satisfy the requirements of Section 162(m) of the Code and the
regulations promulgated thereunder regarding the exclusion of performance-based
compensation from the limit on corporate deductibility of compensation paid to
certain executive officers.

(c) It is expressly contemplated that the Board may amend the Plan in any
respect the Board deems necessary or advisable to provide Optionees with the
maximum benefits provided or to be

                                      -9-
<PAGE>   10

provided under the provisions of the Code and the regulations promulgated
thereunder relating to Incentive Stock Options and/or to bring the Plan and/or
Incentive Stock Options granted under it into compliance therewith.

(d) Rights and obligations under any Option granted before amendment of the Plan
shall not be altered or impaired by any amendment of the Plan unless (i) the
Company requests the consent of the person to whom the Option was granted and
(ii) such person consents in writing.

12.      TERMINATION OR SUSPENSION OF THE PLAN.

(a) The Board may suspend or terminate the Plan at any time. Unless sooner
terminated, the Plan shall terminate on June 5, 2003 which shall be within ten
(10) years from the date the Plan is adopted by the Board or approved by the
stockholders of the Company, whichever is earlier. No Options may be granted
under the Plan while the Plan is suspended or after it is terminated.

(b) Rights and obligations under any Option granted while the Plan is in effect
shall not be altered or impaired by suspension or termination of the Plan,
except with the consent of the person to whom the Option was granted.

13.      EFFECTIVE DATE OF PLAN.

The Plan shall become effective as determined by the Board, but no Options
granted under the Plan shall be exercised unless and until the Plan has been
approved by the stockholders of the Company, which approval shall be within
twelve (12) months before or after the date the Plan is adopted by the Board,
and, if required, an appropriate permit has been issued by the Commissioner of
Corporations of the State of California.

                                      -10-

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