ALPHA MICROSYSTEMS
SC 13D/A, 1999-11-24
ELECTRONIC COMPUTERS
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                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                  SCHEDULE 13D

                                (Amendment No. 2)

                    Under the Securities Exchange Act of 1934

                               ALPHA MICROSYSTEMS
                                (Name of Issuer)

                           Common Stock, no par value
                         (Title of Class of Securities)

                                    020903100
                                 (CUSIP Number)

                                Benjamin P. Giess
                         Hampshire Equity Partners, L.P.
                         520 Madison Avenue, 33rd Floor
                            New York, New York 10022
                                 (212) 453-1600

                                    Copy to:
                                James B. Carlson
                              Mayer, Brown & Platt
                                  1675 Broadway
                               New York, NY 10019
                                 (212) 506-2500

                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                November 18, 1999
             (Date of Event Which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject to this  Schedule 13D, and is filing this
schedule  because of Rule  13d-1(e),  13d-1(f) or 13d-1(g),  check the following
box. [ ]

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purposes of Section 18 of the  Securities  Exchange Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


<PAGE>



CUSIP No. 020903100

                                  SCHEDULE 13D


1          NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
           Hampshire Equity Partners II, L.P. (f/k/a ING Equity Partners II,
           L.P.)


2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A                   (a)[ ]
           GROUP*
                                                                        (b)|X|


3          SEC USE ONLY

4          SOURCE OF FUNDS*
           WC


5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
           REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E)                         [ ]


6          CITIZENSHIP OR PLACE OF ORGANIZATION
           Delaware

                                    7       SOLE VOTING POWER
                  NUMBER OF                 8,907,874
                    SHARES
                 BENEFICIALLY       8       SHARED VOTING POWER
                   OWNED BY                 None
                     EACH
                  REPORTING         9       SOLE DISPOSITIVE POWER
                    PERSON                  8,907,874
                     WITH
                                    10      SHARED DISPOSITIVE POWER
                                            None


11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
           REPORTING PERSON 8,907,874


12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
           EXCLUDES CERTAIN SHARES*                                      [ ]


13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
           42.94%

14         TYPE OF REPORTING PERSON*
           PN


                                       -2-



<PAGE>


                                  SCHEDULE 13D

Company: Alpha Microsystems                              CUSIP Number: 020903100


Item 1.  Security and Company.

         ITEM 1 IS  HEREBY  AMENDED  AND  RESTATED  IN ITS  ENTIRETY  TO READ AS
FOLLOWS:

         This statement  relates to the Common Stock,  no par value (the "Common
Stock"), of Alpha Microsystems,  a California corporation (the "Company"), which
has its principal  executive  offices at 2722 South Fairview Street,  Santa Ana,
California 92704.

         The original  Schedule 13D (the "Original  Schedule 13D") to which this
Amendment  relates was filed with the  Securities  and  Exchange  Commission  on
September 11, 1998. Amendment No. 1 to the original Schedule 13D ("13D Amendment
No. 1") was filed on October 26, 1998.


Item 2.  Identity and Background.

         ITEM 2 IS  HEREBY  AMENDED  AND  RESTATED  IN ITS  ENTIRETY  TO READ AS
FOLLOWS:

                  (a) This  statement  is being  filed on  behalf  of  Hampshire
         Equity  Partners  II, L.P.  (f/k/a ING Equity  Partners  II,  L.P.),  a
         Delaware   limited   partnership   (hereinafter   referred  to  as  the
         "Investment  Partnership").  The sole general partner of the Investment
         Partnership is Lexington  Equity Partners II, L.P., a Delaware  limited
         partnership (the "Lexington  Partnership"). The sole general partner of
         the  Lexington  Partnership  is Lexington  Equity  Partners II, Inc., a
         Delaware  corporation  (the  "Lexington  Corporation").  Tracey L. Rudd
         ("Rudd"),  Olivier  L.  Trouveroy  ("Trouveroy")  and  Gregory P. Flynn
         ("Flynn") are executive  officers,  directors and  shareholders  of the
         Lexington  Corporation.  Benjamin P. Giess ("Giess") and David H. Morse
         ("Morse") are  executive  officers of the  Lexington  Corporation.  The
         Investment  Partnership,   the  Lexington  Partnership,  the  Lexington
         Corporation,  Rudd,  Flynn,  Trouveroy,  Giess and Morse  sometimes are
         collectively referred to herein as the "Hampshire Persons."

                  (b) The  principal  business  address of each of the Hampshire
         Persons is c/o Hampshire  Equity  Partners,  520 Madison  Avenue,  33rd
         Floor, New York, New York 10022.

                  (c) The Investment Partnership,  the Lexington Partnership and
         the  Lexington  Corporation  are  principally  engaged in the financial
         service   and  investment  business.  Rudd, Trouveroy, Flynn, Giess and
         Morse are  principally employed by the Hampshire Persons and affiliated
         entities.

                                       -3-


<PAGE>


Company: Alpha Microsystems                             CUSIP Number: 020903100



                  (d) During the last five years none of the  Hampshire  Persons
         has been convicted in a criminal  proceeding required to be reported in
         accordance with Item 2(d) of Schedule 13D.

                  (e) During the last five years none of the  Hampshire  Persons
         has been a party  to a civil  proceeding  required  to be  reported  in
         accordance with Item 2(e) of Schedule 13D.

                  (f) Rudd, Trouveroy, Flynn,  Giess and  Morse are  citizens of
         the United States.


Item 3.  Source and Amount of Funds or Other Consideration.

         ITEM 3 IS  HEREBY  AMENDED  AND  RESTATED  IN ITS  ENTIRETY  TO READ AS
FOLLOWS:

         The source of funds for the Investment  Partnership's  acquisition  was
money held for investment by the Investment Partnership. The aggregate amount of
funds  used  by  the  Investment  Partnership  in  making  the  acquisition  was
$20,000,000.00,  which amount  includes the  $8,000,000  paid by the  Investment
Partnership at the First Closing (as defined below),  the $7,000,000 paid by the
Investment  Partnership  at the  Second  Closing  (as  defined  below)  and  the
$5,000,000  paid by the Investment  Partnership at the Third Closing (as defined
below).


Item 4.  Purpose of Transaction.

         ITEM 4 IS HEREBY AMENDED AS FOLLOWS:

         On August 7, 1998, the Company and the Investment  Partnership  entered
into a Securities Purchase Agreement (the "Purchase  Agreement," a copy of which
is attached to 13D  Amendment  No. 1 as Exhibit A thereto  and  incorporated  by
reference herein),  whereby the Investment  Partnership  agreed,  subject to the
terms and conditions of the Purchase Agreement, to purchase up to $20,000,000 of
the Company's redeemable,  exchangeable  preferred stock, voting preferred stock
and  warrants  to  purchase  Common  Stock   (collectively,   the   "Purchasable
Securities")  in three  separate  tranches of  $8,000,000,  $7,000,000 and up to
$5,000,000.   The  Investment  Partnership's   acquisition  of  any  Purchasable
Securities under the Purchase Agreement is for investment purposes.

         On September 1, 1998, the first closing (the "First Closing") under the
Purchase Agreement took place. At the First Closing, the Investment  Partnership
acquired  for an aggregate  purchase  price of  $8,000,000:  (i) 8,000 shares of
Class A Cumulative,  Redeemable and  Exchangeable  Preferred Stock, no par value
(the "Class A Preferred  Stock"),  (ii) one share

                                      -4-

<PAGE>



Company: Alpha Microsystems                              CUSIP Number: 020903100

of Voting  Preferred  Stock, no par value (the "Voting  Preferred  Stock"),  and
(iii) warrants (the "First  Closing  Warrants") to purchase a total of 2,181,448
shares of Common Stock  (approximately  19.9% of the shares then outstanding) at
an initial  exercise  price of $1.50 per share.  The  Original  Schedule 13D was
filed in connection with the First Closing.

         On October 19,  1998,  following  approval by the  shareholders  of the
Company  and the  satisfaction  of certain  other  terms and  conditions  of the
Purchase Agreement, the second closing under the Purchase Agreement (the "Second
Closing") took place. At the Second Closing, the Investment Partnership acquired
for an  aggregate  purchase  price of  $7,000,000:  (i) 7,000  shares of Class B
Cumulative,  Redeemable  and  Exchangeable  Preferred  Stock,  no par value (the
"Class B Preferred Stock"), and (ii) warrants (the "Second Closing Warrants") to
purchase a total of 2,568,181 shares of Common Stock (approximately 14.5% of the
shares  currently  outstanding) at an initial exercise price of $2.50 per share.
13D Amendment No. 1 was filed in connection with the Second Closing.

         In addition,  at the Second  Closing the aggregate  number of shares of
Common Stock purchasable  pursuant to the First Closing Warrants  increased from
2,181,448 to 3,276,645  (though in percentage  terms, this represents a decrease
from 19.9% to 18.5% of the shares  outstanding)  and the  exercise  price of the
First Closing Warrants increased from $1.50 to $2.50 per share. Accordingly, the
aggregate  number  of  shares  of Common  Stock  purchasable  by the  Investment
Partnership  pursuant  to the First  Closing  Warrants  and the  Second  Closing
Warrants  became   5,844,825   (assuming  no  anti-dilution   adjustments),   or
approximately   33.0%  of  the   outstanding   shares  of  Common   Stock  on  a
fully-diluted, post-issuance basis.

         On January 22, 1999, the Investment Partnership and the Company entered
into a  Preferred  Shareholder  Agreement,  pursuant  to  which  the  Investment
Partnership  agreed  to  exchange:  (i)  8,000  shares  of  outstanding  Class A
Preferred  Stock  for  2,500  shares  of Class  A1  Cumulative,  Redeemable  and
Exchangeable  Preferred Stock (the "Class A1 Preferred  Stock") and 5,500 shares
of Class A2 Cumulative,  Redeemable and Exchangeable Preferred Stock (the "Class
A2  Preferred  Stock") and (ii) 7,000  shares of  outstanding  Class B Preferred
Stock  for 7,000  shares of Class B1  Cumulative,  Redeemable  and  Exchangeable
Preferred Stock (the "Class B1 Preferred Stock").

         In February,  1999, the Company and the Investment Partnership executed
Amendment No. 1 to the Purchase  Agreement in order to authorize the issuance of
Class C1 Cumulative,  Redeemable and Exchangeable Preferred Stock (the "Class C1
Preferred Stock"), rather than Class C Preferred Stock, at the Third Closing. On
June 28, 1999, the Company and the Investment Partnership executed Amendment No.
2 to the  Purchase  Agreement  in order to  extend  the date by which  the Third
Closing must occur from June 30, 1999 to June 30, 2000.  Copies of Amendment No.
1 and Amendment No. 2 to the Purchase Agreement are attached hereto as Exhibit A
and Exhibit B, respectively, and are incorporated by reference herein.


                                       -5-



<PAGE>


Company: Alpha Microsystems                              CUSIP Number: 020903100


         On November 18, 1999, following the execution of Amendment No. 3 to the
Purchase  Agreement  (a copy of which is  attached  hereto  as  Exhibit C and is
incorporated by reference herein) the third closing under the Purchase Agreement
(the  "Third  Closing")  took  place.  At  the  Third  Closing,  the  Investment
Partnership  acquired for an aggregate  purchase price of $5,000,000:  (i) 5,000
shares of Class C1 Cumulative,  Redeemable and Exchangeable  Preferred Stock, no
par value (the  "Class C1  Preferred  Stock"),  and (ii)  warrants  (the  "Third
Closing Warrants") to purchase a total of 1,970,737 shares of Common Stock at an
initial exercise price of $2.50 per share.

         In addition,  at the Third  Closing the  aggregate  number of shares of
Common Stock purchasable  pursuant to the First Closing Warrants  increased from
3,276,645  to  3,837,746  and the  aggregate  number of  shares of Common  Stock
purchasable  pursuant to the Second Closing Warrants increased from 2,568,181 to
3,007,963, in each case pursuant to the existing terms of such Warrants.

         Accordingly,  the First Closing  Warrants,  the Second Closing Warrants
and the Third Closing Warrants now held by the Investment Partnership entitle it
to purchase an  aggregate  of  8,816,446  shares of Common  Stock  (assuming  no
anti-dilution   adjustments  are  required),   or  approximately  42.5%  of  the
outstanding shares of Common Stock on a fully-diluted,  post- issuance basis, at
an exercise price of $2.50 per share.

         Benjamin P. Giess holds an Option to purchase  137,143 shares of Common
Stock. The Option vests over time.  Specifically,  the Option was exercisable in
respect of 45,714 shares of Common Stock as of October 15, 1998, was exercisable
in respect of an  additional  45,714  shares of Common  Stock as of October  15,
1999,  and will be  exercisable  in respect of the  remaining  45,715  shares of
Common Stock as of October 15, 2000,  provided that Mr. Giess remains a director
of the Company. Accordingly, the Option is currently exercisable with respect to
91,428 shares of Common Stock,  which is 0.44% of the outstanding  Common Stock.
The Option was granted to Mr.  Giess  pursuant  to his status as a  non-employee
director  of  the  Company,  a  position  for  which  he was  designated  by the
Investment  Partnership.  Although the Option was granted directly to Mr. Giess,
under the Agreement of Limited  Partnership of the Investment  Partnership he is
prohibited  from  realizing  any  direct  benefit  from the Option and holds the
Option for the  benefit  of the  Investment  Partnership.  Mr.  Giess  disclaims
beneficial ownership of all of the Common Stock underlying the Option.

         The Voting Preferred Stock owned by the Investment  Partnership has the
rights and preferences set forth in the Company's  Certificate of  Determination
of Rights and Preferences of Class A Preferred  Stock,  Class B Preferred Stock,
Class C Preferred  Stock and Voting  Preferred  Stock,  which was filed with the
Secretary  of State of the State of  California  on August 25, 1998 (the "August
25, 1998  Certificate  of  Determination").  The August 25, 1998  Certificate of
Determination is incorporated  herein by reference to Exhibit B of 13D Amendment
No. 1.

                                       -6-



<PAGE>


Company: Alpha Microsystems                              CUSIP Number: 020903100



The Class A1 Preferred Stock, Class A2 Preferred Stock, Class B1 Preferred Stock
and Class C1 Preferred Stock owned by the Investment Partnership contain similar
rights  and  preferences  which are set forth in the  Company's  Certificate  of
Determination  of Rights and Preferences of Class A1 Preferred  Stock,  Class A2
Preferred Stock,  Class B1 Preferred Stock, Class C1 Preferred Stock and Class D
Preferred  Stock,  which was filed with the  Secretary  of State of the State of
California  on  February  22,  1999  (the  "February  22,  1999  Certificate  of
Determination"). A copy of the February 22, 1999 Certificate of Determination is
attached hereto as Exhibit D, and is incorporated by reference herein.

         The terms of the Voting  Preferred Stock entitle holders of such Voting
Preferred  Stock to vote  together  with the holders of the Common  Stock on all
matters submitted to the Company's  shareholders for consideration,  and to cast
an  aggregate  number of votes  equal to the  number  of shares of Common  Stock
issuable upon exercise of the then  unexercised  portion of the Warrants held by
such  holder  of Voting  Preferred  Stock.  The  Voting  Preferred  Stock is not
entitled to  dividends,  and in the event of a  liquidation  of the  Company,  a
holder thereof is entitled to be paid the original cost of the Voting  Preferred
Stock  ($100)  before  payment  is made upon any  shares  of any other  class of
capital stock of the Company other than Redeemable Preferred Stock.

         As of the First  Closing,  the Company  expanded its Board of Directors
(the  "Board")  from  five to six  members  and,  pursuant  to the  terms of the
Purchase  Agreement,  the  Investment  Partnership  designated,  and the Company
appointed, Benjamin P. Giess and Carlos De Mattos to the Board. As of the Second
Closing,  the Board was further  expanded to seven members and,  pursuant to the
terms of the Purchase Agreement, the Investment Partnership designated,  and the
Company appointed, Sam Yau to the Board.

         The First Closing  Warrants and the Second Closing  Warrants  expire on
September 1, 2008.  The Third Closing  Warrants  expire on November 18, 2009. In
addition,  the First Closing Warrants, the Second Closing Warrants and the Third
Closing Warrants are subject to certain adjustments,  including  adjustments for
payments of dividends or  distributions  and  adjustments  for certain  dilutive
issuances  of  Common  Stock  and  convertible  securities.  The  First  Closing
Warrants,  the Second Closing  Warrants and the Third Closing  Warrants  contain
provisions providing for an optional cashless exercise and certain anti-dilution
provisions which could increase the number of shares of Common Stock purchasable
upon exercise of such Warrants in the event of certain future dilutive issuances
of Common Stock or convertible  securities.  Other adjustments are applicable in
the event of certain dividends, stock splits, mergers or reclassifications.  The
First  Closing  Warrants,  the Second  Closing  Warrants,  and the Third Closing
Warrants  are  substantially  in the form  attached  to 13D  Amendment  No. 1 as
Exhibit C thereto and incorporated by reference herein.

         The  acquisition  of the  Company's  securities  has  been  made by the
Investment   Partnership  for  investment  purposes.   Although  the  Investment
Partnership has no present

                                       -7-



<PAGE>


Company: Alpha Microsystems                              CUSIP Number: 020903100


intention  to do so,  the  Investment  Partnership  may,  in  addition  to those
purchases  contemplated above, make purchases of the Company's securities either
in  the  open  market  or  in  privately  negotiated   transactions,   including
transactions  with the Company,  depending  on an  evaluation  of the  Company's
business prospects and financial condition, the market for the securities, other
available investment opportunities,  money and stock market conditions and other
future developments.  Depending on these factors, the Investment Partnership may
decide  to sell all or part of its  holdings  of the Class A1  Preferred  Stock,
Class A2 Preferred Stock the Class B1 Preferred Stock, Class C1 Preferred Stock,
the Voting  Preferred  Stock and the  Warrants  in one or more public or private
transactions.

         Except as set forth in this Item 4, the Investment  Partnership  has no
present plans or proposals  that relate to or would result in any of the actions
specified  in clauses (a) through (j) of Item 4 of Schedule  13D.  However,  the
Investment  Partnership  reserves the right to propose or  participate in future
transactions which may result in one or more of such actions,  including but not
limited  to,  an  extraordinary   corporate  transaction,   such  as  a  merger,
reorganization or liquidation,  of a material amount of assets of the Company or
its subsidiaries,  or other  transactions which might have the effect of causing
the Company's  Common Stock to cease to be listed on the NASDAQ  National Market
or causing the Common Stock to become eligible for termination of  registration,
under Section 12(g) of the Exchange Act.


Item 5.  Interest in Securities of the Company.

         ITEM 5 IS  HEREBY  AMENDED  AND  RESTATED  IN ITS  ENTIRETY  TO READ AS
FOLLOWS:

         The  Investment  Partnership  is deemed to be the  beneficial  owner of
8,907,874  shares of the Company's  Common Stock.  The Investment  Partnership's
deemed beneficial  ownership  represents  approximately  42.94% of the Company's
outstanding  Common  Stock.  Except  as set  forth  in  Item 4,  the  Investment
Partnership  has sole voting  power and  dispositive  power with  respect to its
shares of Common  Stock.  The  Investment  Partnership  is the record  holder of
$20,000,000.00 in aggregate  principal amount of Class A1 Preferred Stock, Class
A2 Preferred Stock, Class B1 Preferred Stock,  Class C1 Preferred Stock,  Voting
Preferred  Stock and Restated  Series A, Restated  Series B, Series C, Series D,
Series E and Series F Warrants of the Company and is the beneficial  owner of an
Option to acquire an  additional  91,428  shares that was granted to Benjamin P.
Giess.

         Except as reported in this  Statement,  the Investment  Partnership has
not  effected  any  transactions  in regard to the Common  Stock during the past
sixty days.  No person other than the  Investment  Partnership  has the right to
receive or the power to direct the receipt of (i)  dividends  from the Class A1,
Class A2, Class B1 or Class C1 Preferred  Stock or the proceeds from the sale of
the Class A1, Class A2, Class B1 or Class C1 Preferred Stock owned  beneficially
by the Investment Partnership, (ii) proceeds from the sale of the Warrants owned
beneficially  by the

                                      -8-



<PAGE>


Company: Alpha Microsystems                              CUSIP Number: 020903100



Investment  Partnership  or (iii)  proceeds  from the sale of the  Common  Stock
following the exercise of the Warrants or the Option.


Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
         to Securities of the Company.

         ITEM 6 HAS NOT BEEN AMENDED BUT IS HEREBY RESTATED IN ITS
ENTIRETY:

         Reference is made to the  information  disclosed under Items 3 and 4 of
this Statement  which is  incorporated by reference in response to this Item. In
addition  to  such   information,   the   following   contracts,   arrangements,
understandings or relationships are reported hereunder.

         The Purchase Agreement  provides that the Investment  Partnership shall
have access to the records of the Company and that the Company shall furnish its
financial reports to the Investment  Partnership.  The Company covenants that it
shall, among other things, pay its taxes, preserve its corporate existence,  and
maintain and preserve its properties.

         Pursuant  to  the  Purchase  Agreement,   so  long  as  the  Investment
Partnership   holds  Common  Stock  Equivalents  (as  defined  in  the  Purchase
Agreement)  representing  at least 10% of the  Common  Stock on a  fully-diluted
basis, the Investment  Partnership has the right, subject to certain exceptions,
to purchase a proportionate share of any new securities to be issued and sold by
the Company  equal to the  proportionate  share of Common Stock  underlying  the
Warrants held by the Investment Partnership on a fully-diluted basis.

         The Certificate sets forth additional  rights and privileges of each of
the  classes  of the  Preferred  Stock  and the  Voting  Preferred  Stock of the
Company. More specifically, the Certificate sets forth, where applicable, voting
rights, rights to dividends,  liquidation preferences,  rights of redemption and
exchange rights.

         The  Company  and  the  Investment  Partnership  have  entered  into  a
Registration Rights Agreement, dated August 7, 1998, which grants the Investment
Partnership  the right,  on up to three  occasions,  to require  the  Company to
register under the Securities Act of 1933, as amended, all or any portion of the
Common  Stock   issuable  upon  exercise  of  the  Warrants  (the   "Registrable
Securities") for sale in a public offering. The Company will also be entitled to
sell  Common  Stock  in  such  registration  for  its  own  account  unless  the
underwriters of such offering believe that such inclusion would adversely affect
the success of the proposed offering by the Investment Partnership. In addition,
the Investment  Partnership will have the right to require the Company to file a
shelf registration for an offering of the Registrable Securities on a continuous
basis.

                                       -9-



<PAGE>


Company: Alpha Microsystems                              CUSIP Number: 020903100



         If  the  Company  at any  time  seeks  to  register  any of its  equity
securities  under the  Securities  Act for sale to the public,  then the Company
must  include,  at  the  Investment   Partnership's   request,   the  Investment
Partnership's   Registrable   Securities   in   such   registration   statement.
Notwithstanding  the  foregoing,  in connection  with any offering  involving an
underwriting of securities being issued by the Company,  the Company will not be
required to include any of the Investment  Partnership's  Registrable Securities
therein unless the Investment Partnership accepts and agrees to the terms of the
underwriters  selected by the  Company,  and then only in such  quantity as will
not, in the opinion of the underwriters,  adversely affect the proposed offering
by the Company.


Item 7.  Material to be Filed as Exhibits.

         ITEM 7 AND THE ATTACHED  EXHIBITS  HAVE NOT BEEN AMENDED BUT ARE HEREBY
RESTATED IN THEIR ENTIRETY:

Exhibit A         Amendment No. 1, dated February 1999, to Securities Purchase
                  Agreement, dated August 7, 1998, by and between the Company
                  and the Investment Partnership.

Exhibit B         Amendment No. 2, dated June 28, 1999, to Securities Purchase
                  Agreement, dated August 7, 1998 by and between the Company
                  and the Investment Partnership.

Exhibit C         Amendment No. 3, dated November 18, 1999, to Securities
                  Purchase Agreement, dated August 7, 1998, by and between
                  the Company and the Investment Partnership.

Exhibit D         Certificate of Determination of Rights and Preferences of
                  Class A1 Preferred Stock, Class A2 Preferred Stock, Class B1
                  Preferred Stock, Class C1 Preferred  Stock  and  Class D
                  Preferred Stock, as filed with the Secretary of State of the
                  State of California on February 22, 1999.


                                      -10-



<PAGE>


Company: Alpha Microsystems                              CUSIP Number: 020903100

                                    SIGNATURE


         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

Date: November 24, 1999            HAMPSHIRE EQUITY PARTNERS II, L.P.

                                   By:  LEXINGTON EQUITY PARTNERS II, L.P.
                                        its General Partner

                                   By:  LEXINGTON EQUITY PARTNERS II, INC.
                                        its General Partner


                                   By:  /s/ Benjamin P. Giess
                                      ------------------------------------
                                       Name: Benjamin P. Giess
                                       Title: Authorized Signatory




                                      -11-



<PAGE>

                                                                      EXHIBIT A


                AMENDMENT NO. 1 TO SECURITIES PURCHASE AGREEMENT

         AMENDMENT NO. 1 TO SECURITIES PURCHASE AGREEMENT,  dated as of February
__, 1999 (this "Amendment") to that certain Securities  Purchase Agreement dated
as of August 7, 1998 (the "Purchase  Agreement") between ALPHA  MICROSYSTEMS,  a
California  corporation  (the  "Company"),  and ING EQUITY  PARTNERS II, L.P., a
Delaware  limited  partnership  (the  "Purchaser"),  is made by and  between the
Company and the Purchaser.

         WHEREAS,  in order to satisfy  the  requirements  of the  Nasdaq  Stock
Market  for  continued  listing  of the  Company's  Common  Stock on the  Nasdaq
National Market, the Company and the Purchaser have agreed to exchange the Class
A Preferred Stock and Class B Preferred  Stock issued to the Purchaser  pursuant
to the terms of the  Purchase  Agreement  for shares of new series of  Preferred
Stock designated as Class A1 Preferred Stock, Class A2 Preferred Stock and Class
B1 Preferred Stock, in each case having the rights, preferences,  privileges and
restrictions  set  forth in the  Certificate  of  Determination  of  Rights  and
Preferences   attached   hereto  as   Exhibit  A  (the   "New   Certificate   of
Determination");

         WHEREAS,  the Company has  requested  that the  Purchaser  agree to the
amendment of the Purchase  Agreement in order for the Company to accommodate the
actions  required by the listing  requirements of the Nasdaq Stock Market and to
provide for the issuance of Class C1 Preferred Stock at the Second Closing,  and
both the Company and the  Purchaser  mutually  desire to maintain the listing of
the  Company's  Common  Stock on the Nasdaq  National  Market and are willing to
enter into this Amendment to provide such accommodation; and

         NOW,  THEREFORE,  in consideration of the premises and mutual covenants
and  obligations  hereinafter  set forth,  the Company and the Purchaser  hereby
agree as follows:

         SECTION  1.  Definitions.  Capitalized  terms  used  but not  otherwise
defined  herein shall have the meaning  given to them in the Purchase  Agreement
or, if not defined therein, in the New Certificate of Determination.

         SECTION 2. Amendments to Purchase Agreement.  The Purchase Agreement is
hereby amended as of date hereof as follows:

         (a)  Section 1.1 is amended to add the following definitions:

                           "Class  A1  Preferred   Stock"  means  the  Class  A1
                  Cumulative,  Redeemable and  Exchangeable  Preferred Stock, no
                  par value, of the Company.

                           "Class  A2  Preferred   Stock"  means  the  Class  A2
                  Cumulative,  Redeemable and  Exchangeable  Preferred Stock, no
                  par value, of the Company.



                                       1
<PAGE>


                           "Class  B1  Preferred   Stock"  means  the  Class  B1
                  Cumulative,  Redeemable and  Exchangeable  Preferred Stock, no
                  par value, of the Company.

                           "Class  C1   Preferred   Stock"  means  the  Class  C
                  Cumulative,  Redeemable and  Exchangeable  Preferred Stock, no
                  par value, of the Company.

                           "Class  D   Preferred   Stock"   means  the  Class  D
                  Cumulative,  Redeemable and  Exchangeable  Preferred Stock, no
                  par value, of the Company.

         (b) Section 1.1 is further  amended to amend and restate the  following
definition:

                           "Preferred  Stock" means,  collectively,  the Class A
                  Preferred  Stock,  the Class B  Preferred  Stock,  the Class C
                  Preferred  Stock,  any Voting  Preferred  Stock,  the Class A1
                  Preferred  Stock,  the Class A2 Preferred  Stock, the Class B1
                  Preferred  Stock, the Class C1 Preferred Stock and the Class D
                  Preferred Stock.

         (c) Section 1.3 is amended and restated in its entirety as follows:

                            1.3 Purchase and Sale of the Preferred Stock. At the
                  First  Closing,  subject to the terms and conditions set forth
                  herein, the Company will sell, and the Investor will purchase,
                  8,000  shares  of the  Class A  Preferred  Stock at a price of
                  $1,000 per share and one (1) share of Voting  Preferred  Stock
                  at a price of $100 per share. At the Second  Closing,  subject
                  to the terms and conditions set forth herein, the Company will
                  sell,  and the  Investor  will  purchase,  7,000 shares of the
                  Class B Preferred Stock at a price of $1,000 per share. At the
                  Third  Closing,  subject to the terms and conditions set forth
                  herein, the Company will sell, and the Investor will purchase,
                  up to 5,000 shares of Class C1  Preferred  Stock at a price of
                  $1,000 per share.

         (d) Section 2.2(c) is amended and restated in its entirety as follows:

                           (c) The  proceeds  received by the  Company  from the
                  sale of the Class C1 Preferred  Stock to the Investor shall be
                  used by the Company  solely for the Company's  acquisition  of
                  information   technology   service   companies  on  terms  and
                  conditions which are reasonably acceptable to the Investor.

         (e) The first  sentence of Section  5.4 is amended and  restated in its
entirety as follows:

                           5.4 Third Closing.  The obligation of the Investor to
                  purchase and pay for the Class C1  Preferred  Stock is subject
                  to the  satisfaction  of the  following  conditions  precedent
                  (unless waived by the Investor).

         (f) Section 5.4(a) is amended and restated in its entirety as follows:


                                       2

<PAGE>


                           (a) Issuance of  Securities.  The Company  shall have
                  duly  issued  and  delivered  to  the  Investors  certificates
                  evidencing the Class C1 Preferred Stock being purchased by the
                  Investor at the Third Closing and the Third Closing Warrants.

         (g)  A  new  Exhibit  A-1  in  the  form  of  the  New  Certificate  of
Determination is added to the Purchase Agreement.

         SECTION  3. No  Implied  Amendments.  Except  as  herein  amended,  the
Purchase  Agreement shall remain in full force and effect and is ratified in all
respects.  On and after the  effectiveness of this Amendment,  each reference in
the Purchase Agreement to "this Agreement",  "hereunder",  "hereof", "herein" or
words of like import,  and each reference to the Purchase Agreement in any other
agreements,  documents or  instruments  executed and  delivered  pursuant to the
Purchase Agreement,  shall mean and be a reference to the Purchase Agreement, as
amended by this Amendment.

         SECTION 4. Costs and  Expenses.  The  Company  confirms  the  Company's
agreement to pay all reasonable fees,  expenses and costs of Equity Partners for
the  negotiation,  preparation,  execution  and delivery of this  Amendment  and
amendments,  as necessary,  to the other Purchase Documents,  in connection with
this Amendment  (including the reasonable  fees,  expenses and  disbursements of
Equity  Partners'  counsel)  all as provided  for in Section 8.1 of the Purchase
Agreement.

         SECTION  5.  Effective   Date.   This  Amendment   shall  be  effective
immediately following the effectiveness of the New Certificate of Determination.

         SECTION 6. Counterparts.  This Amendment may be executed by the parties
hereto in several  counterparts,  each of which shall be executed by the Company
and the  Purchaser  and be  deemed  to be an  original  and all of  which  shall
constitute together but one and the same agreement.

                                     * * * *


                                        3



<PAGE>


                  IN WITNESS  WHEREOF,  the parties have executed this Amendment
as of the date first above-written.


                                ALPHA MICROSYSTEMS


                                By: /s/  Douglas J. Tullio
                                   ------------------------------------------
                                   Name: Douglas J. Tullio
                                   Title:  President and Chief Executive Officer



                                ING EQUITY PARTNERS II, L.P.

                                By: LEXINGTON EQUITY PARTNERS II, L.P.,
                                     its General Partner


                                By: LEXINGTON EQUITY PARTNERS, INC.,
                                      Its General Partner



                                By: /s/ Benjamin P. Giess
                                   -------------------------------------------
                                   Name: Benjamin P. Giess
                                   Title:   Authorized Signatory


<PAGE>


                                                                       EXHIBIT B


                AMENDMENT NO. 2 TO SECURITIES PURCHASE AGREEMENT

         AMENDMENT NO. 2 TO SECURITIES PURCHASE AGREEMENT,  dated as of June 28,
1999 (this "Amendment") to that certain  Securities  Purchase Agreement dated as
of August 7,  1998 (as the same has been or will be  amended  from time to time,
the "Purchase Agreement") between Alpha Microsystems,  a California  corporation
doing business as AlphaServ.com  (the "Company"),  and HAMPSHIRE EQUITY PARTNERS
II, L.P.  (f/k/a ING Equity Partners II, L.P.), a Delaware  limited  partnership
(the "Purchaser"), is made by and between the Company and the Purchaser.

         WHEREAS, at the First Closing and the Second Closing under the Purchase
Agreement,  the Purchaser  invested $15.0 million to purchase certain classes of
Preferred Stock and Warrants of the Company;

         WHEREAS,  the Purchase Agreement  contemplates a Third Closing at which
the  Purchaser  would,  subject  to the terms  and  conditions  of the  Purchase
Agreement,  invest up to an additional $5.0 million to purchase  Preferred Stock
and Warrants of the Company; and

         WHEREAS,  both the  Company  and the  Purchaser  have  confirmed  their
continued  desire to  consummate  the Third  Closing,  subject  to the terms and
conditions of the Purchase Agreement;

         NOW,  THEREFORE,  in consideration of the premises and mutual covenants
and  obligations  hereinafter  set forth,  the Company and the Purchaser  hereby
agree as follows:

         SECTION  1.  Definitions.  Capitalized  terms  used  but not  otherwise
defined  herein shall have the meaning  given to them in the Purchase  Agreement
or, if not defined therein, in the Company's Certificate of Incorporation.

         SECTION 2. Amendments to Purchase Agreement.  The Purchase Agreement is
hereby amended as of date hereof as follows:

         (a) Section 2.1(c) is amended and restated in its entirety as follows:

                  (c) The third  closing  (the  "Third  Closing")  hereunder  in
         respect of the issuance and sale of the Class C1 Preferred  Stock being
         purchased by the Investor at the Third Closing will occur at the option
         of the  Company,  and  subject  to the  satisfaction  or  waiver of the
         applicable  terms and  conditions  set forth herein,  take place at the
         offices  of Mayer,  Brown & Platt in New  York,  New York at a time and
         date to be agreed  upon by the  Investor  and the  Company  (the "Third
         Closing Date"); provided, that  the Third Closing  Date shall be within
         five Business Days after all conditions of the Investor and

                                        1



<PAGE>



         the Company to the Third Closing have been satisfied or waived,  but in
         any case the Third  Closing Date shall  occur,  if at all, on or before
         June 30, 2000.

         (b) Section 5.4(f) is amended and restated in its entirety as follows:

                  (f) Closing Date.  The Third Closing shall have occurred on or
         prior to June 30, 2000.

         SECTION  3. No  Implied  Amendments.  Except  as  herein  amended,  the
Purchase  Agreement shall remain in full force and effect and is ratified in all
respects.  On and after the  effectiveness of this Amendment,  each reference in
the Purchase Agreement to "this Agreement",  "hereunder",  "hereof", "herein" or
words of like import,  and each reference to the Purchase Agreement in any other
agreements,  documents or  instruments  executed and  delivered  pursuant to the
Purchase Agreement,  shall mean and be a reference to the Purchase Agreement, as
amended by this Amendment.

         SECTION 4. Costs and  Expenses.  The  Company  confirms  the  Company's
agreement to pay all reasonable fees,  expenses and costs of Equity Partners for
the  negotiation,  preparation,  execution  and delivery of this  Amendment  and
amendments,  as necessary,  to the other Purchase Documents,  in connection with
this Amendment  (including the reasonable  fees,  expenses and  disbursements of
Equity  Partners'  counsel)  all as provided  for in Section 8.1 of the Purchase
Agreement.

         SECTION 5. Effective  Date. This Amendment shall be effective as of the
date hereof.

         SECTION 6. Counterparts.  This Amendment may be executed by the parties
hereto in several  counterparts,  each of which shall be executed by the Company
and the  Purchaser  and be  deemed  to be an  original  and all of  which  shall
constitute together but one and the same agreement.

                                     * * * *



                                        2



<PAGE>


                  IN WITNESS  WHEREOF,  the parties have executed this Amendment
as of the date first above-written.


                              ALPHA MICROSYSTEMS



                              By: /s/ Douglas J. Tullio
                                 ---------------------------------------------
                                 Name: Douglas J. Tullio
                                 Title:  President and Chief Executive Officer



                              HAMPSHIRE EQUITY PARTNERS II, L.P.

                              By: LEXINGTON EQUITY PARTNERS II, L.P.,
                                      its General Partner


                              By: LEXINGTON EQUITY PARTNERS, INC.,
                                      Its General Partner



                              By: / /Benjamin P. Giess
                                 ---------------------------------------------
                                 Name: Benjamin P. Giess
                                 Title:   Authorized Signatory



<PAGE>


                                                                       EXHIBIT C

                AMENDMENT NO. 3 TO SECURITIES PURCHASE AGREEMENT

         AMENDMENT NO. 3 TO SECURITIES PURCHASE AGREEMENT,  dated as of November
18, 1999 (this "Amendment") to that certain Securities  Purchase Agreement dated
as of August  7, 1998 (as the same has been  amended  by  Amendment  No. 1 dated
February,  1999  and  Amendment  No.  2  dated  June  28,  1999,  the  "Purchase
Agreement") between ALPHA MICROSYSTEMS,  a California corporation doing business
as AlphaServ.com (the "Company"),  and HAMPSHIRE EQUITY PARTNERS II, L.P. (f/k/a
ING Equity Partners II, L.P.), a Delaware limited partnership (the "Purchaser"),
is made by and between the Company and the Purchaser.

         WHEREAS, at the First Closing and the Second Closing under the Purchase
Agreement, the Purchaser invested an aggregate $15.0 million to purchase certain
classes of Preferred Stock and Warrants of the Company;

         WHEREAS, the Purchase Agreement  contemplates a Third Closing, to occur
at the option of the Company, at which the Purchaser would, subject to the terms
and  conditions  of the  Purchase  Agreement,  invest up to an  additional  $5.0
million to purchase  Class C1 Preferred  Stock and the Third  Closing  Warrants,
with the  proceeds  of such  investment  to be applied by the Company to certain
designated uses; and

         WHEREAS, the Company desires to exercise such option and issue, and the
Purchaser  desires  to  purchase,  the  Class C1  Preferred  Stock and the Third
Closing Warrants, subject to the terms and conditions of the Purchase Agreement;

         NOW,  THEREFORE,  in consideration of the premises and mutual covenants
and  obligations  hereinafter  set forth,  the Company and the Purchaser  hereby
agree as follows:

         SECTION  1.  Definitions.  Capitalized  terms  used  but not  otherwise
defined  herein shall have the meaning  given to them in the Purchase  Agreement
or, if not defined therein, in the Company's Certificate of Incorporation.

         SECTION 2. Amendments to Purchase Agreement.  The Purchase Agreement is
hereby amended as of the date hereof as follows:

         (a)  Section 1.1 is amended to add the following definitions:

                           "Class E  Certificate  of  Determination"  means  the
                  Certificate  of   Determination   of  Rights  and  Preferences
                  attached hereto as Exhibit A-2.

                           "Class  E   Preferred   Stock"   means  the  Class  E
                  Cumulative,  Redeemable and  Exchangeable  Preferred Stock, no
                  par value,  of the  Company,  having the rights,  preferences,
                  privileges  and   restrictions   set  forth  in  the  Class  E
                  Certificate of Determination.


                                        1



<PAGE>



         (b) Section 1.1 is further  amended to amend and restate the  following
definition:

                           "Preferred  Stock" means,  collectively,  the Class A
                  Preferred  Stock,  the Class B  Preferred  Stock,  the Class C
                  Preferred  Stock,  any Voting  Preferred  Stock,  the Class A1
                  Preferred  Stock,  the Class A2 Preferred  Stock, the Class B1
                  Preferred  Stock,  the Class C1 Preferred  Stock,  the Class D
                  Preferred Stock and the Class E Preferred Stock.

         (c) Section 2.1(c) is amended and restated in its entirety as follows:

                           (c) The third closing (the "Third Closing") hereunder
                  in respect of the  issuance and sale of the Class C1 Preferred
                  Stock being  purchased  by the  Investor at the Third  Closing
                  will occur at the option of the  Company,  and  subject to the
                  satisfaction or waiver of the applicable  terms and conditions
                  set forth herein,  take place at the offices of Mayer, Brown &
                  Platt in New York,  New York on  November  17,  1999,  or such
                  other date agreed upon by the  Investor  and the Company  (the
                  "Third Closing Date");  provided,  that the Third Closing Date
                  shall be within five Business Days after all conditions of the
                  Investor  and the  Company  to the  Third  Closing  have  been
                  satisfied  or waived,  but in any case the Third  Closing Date
                  shall  occur,   if  at  all,  on  or  before  June  30,  2000.
                  Notwithstanding  anything to the contrary contained in the New
                  Certificate relating to the Class A1 Preferred Stock, Class A2
                  Preferred Stock,  Class B1 Preferred Stock, Class C1 Preferred
                  Stock  and Class D  Preferred  Stock,  upon the  filing of the
                  Class E  Certificate  of  Determination  with  the  California
                  Secretary  of  State,  the  Company  shall  have  the  option,
                  exercisable in its sole discretion, of paying dividends on the
                  Class A1 Preferred Stock,  Class A2 Preferred Stock,  Class B1
                  Preferred  Stock and Class C1  Preferred  Stock  either (x) in
                  cash  or (y) in  shares  of  validly  issued,  fully-paid  and
                  nonassessable  Class E Preferred  Stock at a rate of one share
                  per each  integral  multiple of $1,000 of  dividends  payable,
                  with any remaining  fractional  dividend  amount to be paid in
                  cash.

         (d) Section 2.2(c) is amended and restated in its entirety as follows:

                           (c) The  proceeds  received by the  Company  from the
                  sale of the Class C1 Preferred  Stock to the Investor shall be
                  used by the Company solely (i) to repay up to $2,500,000.00 of
                  Indebtedness  that is outstanding  under the Credit Agreement,
                  dated June 9, 1998, between the Company and Imperial Bank (the
                  "Credit  Agreement"),  (ii)  to  fund  the  separation  of the
                  Company's  AlphaCONNECT business from its IT Service business,
                  (iii) to pay fees and expenses incurred in connection with the
                  consummation  of  the  Third  Closing  and  (iv)  for  general
                  corporate purposes.

         (e)   The  current  Section 5.4(b)  is  deleted in its entirety and the
following is substituted in its place:


                                        2



<PAGE>


                           (b) Opinion of Counsel.  Allen, Matkins, Leck, Gamble
                  & Mallory,  counsel to the Company,  shall have  delivered its
                  opinion to the  Investor,  dated as of the Third Closing Date,
                  in a form reasonably acceptable to the Investor.

         (f) The  current  Section  5.4(c) is  deleted in its  entirety  and the
following is substituted in its place:

                           (c) Performance.  [Intentionally Deleted].

         (g) The  following  is added to the  Purchase  Agreement as Section 7.7
thereof:

                           7.7 Filing of Class E Certificate  of  Determination.
                  The Company  shall use its best efforts to file or cause to be
                  filed  the  Series E  Certificate  of  Determination  with the
                  Secretary of State of the State of  California  as promptly as
                  is practicable.

         (h) The  following  is added to the  Purchase  Agreement as Section 7.8
thereof:

                           7.8 Exchange of Series E Preferred Stock. A holder of
                  shares of Series E Preferred  Stock  shall have the right,  at
                  any time,  to surrender  any or all such shares to the Company
                  and   receive  in  exchange   therefor   the  number  of  duly
                  authorized,  validly  issued,  fully  paid  and  nonassessable
                  shares  of  Common   Stock  that   equal  (x)  the   aggregate
                  Liquidation  Value of the shares of Series E  Preferred  Stock
                  being surrendered,  divided by (y) Two Dollars and Fifty Cents
                  ($2.50).

         (i) The  Class E  Certificate  of  Determination  (a copy of  which  is
attached as Exhibit A to this  Amendment) is added to the Purchase  Agreement as
Exhibit A-2 thereof.

         (j) The  Warrant  Schedule  attached  as  Exhibit  C-1 to the  Purchase
Agreement is hereby  amended  such that (i) the Series E Common Stock  Warrant's
"Intended  Percentage"  is  changed  from  8.50% to  8.29487%  and its  "Initial
Exercise Amount" is changed from 1,750,725 to 1,720,737 as of the Third Closing,
and (ii) the Series F Common Stock  Warrant's  "Intended  Percentage" is changed
from 1.00% to 1.20513% and its "Initial Exercise Amount" is changed from 205,968
to 250,000 as of the Third Closing.

         SECTION 3. Warrant Shares as of the Third Closing Date. The Company and
Equity Partners hereby  acknowledge and agree that each outstanding Common Stock
Warrant  issued by the  Company  to Equity  Partners  pursuant  to the  Purchase
Agreement,  after applying the terms and  conditions of such Warrant,  including
any  adjustments   determined  in  accordance  with  the  Warrant  Schedule,  is
exercisable  as of the  Third  Closing  Date for the  number of shares of Common
Stock indicated below:

         (a) The Restated Series A Warrant is exercisable for 3,630,300 shares;


                                        3



<PAGE>



         (b) The Restated Series B Warrant is exercisable for 207,446 shares;

         (c) The Series C Warrant is exercisable for 2,800,517 shares;

         (d) The Series D Warrant is exercisable for 207,446 shares;

         (e) The Series E Warrant is exercisable for 1,720,737 shares; and

         (f) the Series F Warrant is exercisable for 250,000 shares.

This Section 3 shall in no way mitigate the  responsibility  or Liability of the
Company for any breach of the  representations  and warranties made by it in the
Purchase  Agreement,  on which Equity  Partners is relying in full in connection
with the calculation of the foregoing share amounts.

         SECTION 4. Credit Agreement.  Solely with respect to, and to the extent
that,  any event of default  under the Credit  Agreement  has been  disclosed in
writing to the Investor prior to the date of this Amendment, the Investor hereby
waives  the  application  of  Section  5.4(d) as a  condition  precedent  to its
obligation to purchase the Class C1 Preferred Stock.

         SECTION  5. No  Implied  Amendments.  Except  as  herein  amended,  the
Purchase  Agreement shall remain in full force and effect and is ratified in all
respects.  On and after the  effectiveness of this Amendment,  each reference in
the Purchase Agreement to "this Agreement",  "hereunder",  "hereof", "herein" or
words of like import,  and each reference to the Purchase Agreement in any other
agreements,  documents or  instruments  executed and  delivered  pursuant to the
Purchase Agreement,  shall mean and be a reference to the Purchase Agreement, as
amended by this Amendment.

         SECTION 6. Costs and  Expenses.  The  Company  confirms  the  Company's
agreement to pay all reasonable fees,  expenses and costs of Equity Partners for
the  negotiation,  preparation,  execution  and delivery of this  Amendment  and
amendments,  as necessary,  to the other Purchase Documents,  in connection with
this Amendment  (including the reasonable  fees,  expenses and  disbursements of
Equity  Partners'  counsel)  all as provided  for in Section 8.1 of the Purchase
Agreement.  Equity  Partners  shall  notify the  Company to the extent that such
fees, expenses and costs exceed $100,000.

         SECTION 7. Effective  Date. This Amendment shall be effective as of the
date hereof.

         SECTION 8. Counterparts.  This Amendment may be executed by the parties
hereto in several  counterparts,  each of which shall be executed by the Company
and the  Purchaser  and be  deemed  to be an  original  and all of  which  shall
constitute together but one and the same agreement.

                                     * * * *


                                        4

<PAGE>


                  IN WITNESS  WHEREOF,  the parties have executed this Amendment
as of the date first above-written.


                                  ALPHA MICROSYSTEMS



                                  By:  /s/ Douglas J. Tullio
                                     ---------------------------------
                                  Name:  Douglas J. Tullio
                                  Title: President and Chief Executive Officer



                                  HAMPSHIRE EQUITY PARTNERS II, L.P.

                                  By: LEXINGTON EQUITY PARTNERS II, L.P.,
                                        its General Partner


                                  By:  LEXINGTON EQUITY PARTNERS, INC.,
                                         Its General Partner



                                  By: /s/  Benjamin P. Giess
                                     --------------------------------------
                                     Name:  Benjamin P. Giess
                                     Title: Authorized Signatory



<PAGE>


                                                                      EXHIBIT D


                                 CERTIFICATE OF

                     DETERMINATION OF RIGHTS AND PREFERENCES

                                       OF

        CLASS A1 CUMULATIVE, REDEEMABLE AND EXCHANGEABLE PREFERRED STOCK,

        CLASS A2 CUMULATIVE, REDEEMABLE AND EXCHANGEABLE PREFERRED STOCK,

        CLASS B1 CUMULATIVE, REDEEMABLE AND EXCHANGEABLE PREFERRED STOCK,

        CLASS C1 CUMULATIVE, REDEEMABLE AND EXCHANGEABLE PREFERRED STOCK

                                       AND

         CLASS D CUMULATIVE, REDEEMABLE AND EXCHANGEABLE PREFERRED STOCK

                                       OF

                  ALPHA MICROSYSTEMS, a California corporation

                    PURSUANT TO THE PROVISIONS OF SECTION 401

            OF THE GENERAL CORPORATION LAW OF THE STATE OF CALIFORNIA


         Douglas J. Tullio and Jeffrey J. Dunnigan hereby certify that:

         FIRST:  They are the President and  Secretary,  respectively,  of Alpha
Microsystems, a California corporation (the "Company").

         SECOND:  That the Board of Directors  of the  Company,  pursuant to the
authority so vested in it by the Articles of Incorporation of the Company and in
accordance with the provisions of Section 401 of the General  Corporation Law of
the State of California (the  "California  Corporation  Law"),  duly adopted the
following   resolutions   creating  the  following  series  of  Preferred  Stock
designated as (i) Class A1  Cumulative,  Redeemable and  Exchangeable  Preferred
Stock (the "Class A1 Preferred Stock"), (ii) Class A2 Cumulative, Redeemable and
Exchangeable  Preferred Stock (the "Class A2 Preferred  Stock"),  (iii) Class B1
Cumulative, Redeemable and Exchangeable Preferred Stock (the "Class B1 Preferred
Stock"), (iv) Class C1 Cumulative,  Redeemable and Exchangeable  Preferred Stock
(the "Class C1

                                       1



<PAGE>



Preferred  Stock")  and  (v)  Class D  Cumulative  Redeemable  and  Exchangeable
Preferred Stock (the "Class D Preferred Stock").

         THIRD:  That, as required by subsection A,  subsection B,  subsection C
and subsection D,  respectively,  of the Certificate of  Determination of Rights
and  Preferences of Class A Cumulative,  Redeemable and  Exchangeable  Preferred
Stock, Class B Cumulative,  Redeemable and Exchangeable Preferred Stock, Class C
Cumulative,  Redeemable and  Exchangeable  Preferred Stock and Voting  Preferred
Stock of the Company, as filed with the California  Secretary of State on August
25, 1998 (the "8/25/98 Certificate of Determination"), the creation of the Class
A1 Preferred Stock, Class A2 Preferred Stock, Class B1 Preferred Stock, Class C1
Preferred  Stock  and  Class D  Preferred  Stock  has been  consented  to by the
Requisite Preferred Holders,  the Requisite  Preferred A Holders,  the Requisite
Preferred B Holders,  the Requisite Preferred C Holders and the Requisite Voting
Preferred  Holders (as each such term is defined in the 8/25/98  Certificate  of
Determination).

         FOURTH:  That the following  resolutions  designate (i) 2,500 shares of
Class A1 Preferred Stock,  (ii) 5,500 shares of Class A2 Preferred Stock,  (iii)
7,000  shares  of  Class B1  Preferred  Stock,  (iv)  5,000  shares  of Class C1
Preferred  Stock,  and (v) 17,500 shares of Class D Preferred Stock, and that as
of the date hereof,  no shares of Class A1 Preferred  Stock,  Class A2 Preferred
Stock,  Class B1 Preferred Stock,  Class C1 Preferred Stock or Class D Preferred
Stock have been issued.

         FIFTH:  The  resolutions  duly adopted by the Board of Directors of the
Company are as follows:

         WHEREAS  the  Articles  of  Incorporation  of  the  Company   authorize
Preferred Stock consisting of 5,000,000 shares, no par value per share, issuable
from time to time in one or more series; and

         WHEREAS the Board of Directors of the Company is authorized, subject to
limitations  prescribed  by law  and  by the  provisions  of  Article  IV of the
Company's Articles of Incorporation, as amended, to establish and fix the number
of shares to be included in any series of Preferred Stock and the designation of
rights,  preferences,  privileges and restrictions of the shares of such series;
and

         WHEREAS it is the desire of the Board of Directors to establish and fix
the number of shares to be  included  in new series of  Preferred  Stock and the
designation of rights, preferences, privileges and restrictions of the shares of
such new series;

         NOW,  THEREFORE,  BE IT  RESOLVED  that  pursuant  to Article IV of the
Company's Articles of Incorporation, as amended, there is hereby established the
following new series of Preferred  Stock with such  designations  and authorized
number of shares as set forth herein:  (i) 2,500 shares of Class A1  Cumulative,
Redeemable and  Exchangeable  Preferred Stock (the "Class A1 Preferred  Stock"),
(ii) 5,500 shares of Class A2 Cumulative,  Redeemable and Exchangeable Preferred
Stock  (the  "Class  A2  Preferred  Stock"),  (iii)  7,000  shares  of  Class B1
Cumulative, Redeemable and Exchangeable Preferred Stock (the "Class B1 Preferred
Stock"),  (iv) 5,000 shares of Class C1 Cumulative,  Redeemable and Exchangeable
Preferred Stock (the "Class C1 Preferred  Stock") and (v) 17,500 shares of Class
D  Cumulative,  Redeemable  and  Exchangeable  Preferred  Stock  (the  "Class  D
Preferred  Stock").  Each  share of such  Class  A1  Preferred  Stock,  Class A2
Preferred Stock, Class B1 Preferred Stock, Class C1

                                        2



<PAGE>



Preferred Stock and Class D Preferred Stock shall have the rights,  preferences,
privileges and restrictions set forth in the following  Determination of Rights,
Preferences,  Privileges and Restrictions of Class A1 Preferred Stock,  Class B1
Preferred  Stock,  Class C1  Preferred  Stock and Class D  Preferred  Stock (the
"Determination of Preferred Stock"):

A1.      Class A1 Preferred Stock.

         1. Definitions.  As used in this subsection A1 of this Determination of
Preferred Stock,  capitalized  terms not otherwise defined herein shall have the
meanings  given to such  terms  in the  Purchase  Agreement.  In  addition,  the
following capitalized terms have the following meanings:

         "Articles of Incorporation"  means the Articles of Incorporation of the
Company as amended and restated and in effect at the time in question.

         "By-laws"  means the By-laws of the  Company,  as amended and in effect
from time to time.

         "Board" means the Board of Directors of the Company.

         "Class A Preferred Stock" means the Class A Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Class B Preferred Stock" means the Class B Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Class C Preferred Stock" means the Class C Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Common  Stock" means,  collectively,  all of the Common Stock,  no par
value, of the Company of any class,  and any other class of capital stock of the
Company hereafter authorized that is not limited to a fixed sum or percentage of
par or  stated  value  in  respect  to the  rights  of the  holders  thereof  to
participate in dividends or in the  distribution of assets upon any liquidation,
dissolution or winding up of the Company.

         "Dividend  Reference  Date" has the  meaning  ascribed to it in Section
A1.2(c).

         "Exchange Triggering Date" means December 31, 1999.

         "Liquidation"  means, subject to the provisions of Section 3(b) of this
subsection A1, any voluntary or involuntary liquidation,  dissolution or winding
up of the affairs of the Company.

         "Liquidation  Value"  shall mean  Original  Cost plus any  accrued  and
unpaid dividends as determined pursuant to Section 2(c) of this subsection A1.


                                        3



<PAGE>



         "Maturity Date" means,  with respect to any Class A1 Preferred Stock or
Notes issued in exchange for Class A1 Preferred  Stock, the earliest to occur of
(i) a Maturity  Default,  (ii) a Change of  Control or (iii) June 30,  2005 (the
"Calendar Maturity Date").

         "Maturity  Default" shall have the meaning set forth in Section 6(a) of
this subsection A1.

         "Net Proceeds" of any transaction shall mean the gross proceeds of such
transaction net of any commissions or transaction  fees and expenses paid by the
Company in connection with such transaction.

         "Original Cost" means,  with respect to any share of Class A1 Preferred
Stock, $1,000.

         "Person"  shall  be  construed   broadly  and  shall  include   without
limitation an individual, a partnership, a corporation,  an association, a joint
stock  company,  a limited  liability  company,  a trust,  a joint  venture,  an
unincorporated organization and a Governmental Authority.

         "Preferred A1/A2 Holders" means, collectively, Preferred A1 Holders and
Preferred A2 Holders.

         "Preferred A1 Holders" means holders of Class A1 Preferred Stock.

         "Preferred A2 Holders" means holders of Class A2 Preferred Stock.

         "Preferred  Shareholder Agreement" shall mean the Preferred Shareholder
Agreement, dated as of February 17, 1999, between the Company and the Holder (as
defined therein).

         "Preferred  Stock" means,  collectively,  the Class A Preferred  Stock,
Class B Preferred  Stock,  Class C Preferred  Stock,  Class A1 Preferred  Stock,
Class A2 Preferred Stock,  Class B1 Preferred  Stock,  Class C1 Preferred Stock,
Class D Preferred Stock and Voting Preferred Stock.

         "Purchase Agreement" means the Securities Purchase Agreement,  dated as
of August 7, 1998, between the Company and the Investor (as defined therein), as
amended, restated or otherwise modified from time to time.

         "Rate per Annum"  means the  specified  rate per annum  computed on the
basis of a 360-day year;  provided,  that in the event dividends are not paid in
full in cash on any  applicable  Dividend  Reference Date or upon any Redemption
Date,  the Rate per Annum for the  applicable  period  shall be increased by 500
basis points (e.g., a 9.0% Rate per Annum would be increased to a 14.0% Rate per
Annum) until such dividends are paid in full in cash.

         "Redemption Price" has the meaning ascribed to it in Section A1.5(a) of
this Determination of Preferred Stock.

         "Requisite  Preferred  A1/A2 Holders" means the holders  representing a
majority of the then outstanding shares of Class A1 Preferred Stock and Class A2
Preferred Stock voting together as a group.

                                        4



<PAGE>


         "Requisite  Preferred  A1  Holders"  means the holders  representing  a
majority of the then outstanding shares of Class A1 Preferred Stock.

         "Requisite Preferred Holders" means the holders representing a majority
of the then outstanding  shares of Class A1 Preferred Stock,  Class A2 Preferred
Stock,  Class B1 Preferred Stock, Class C1 Preferred Stock and Class D Preferred
Stock voting together as a group.

         "Transaction Documents" means the Purchase Agreement,  the Exhibits and
Schedules attached thereto in their final and executed form, as applicable,  and
each of the agreements contemplated thereby.

         "Voting  Preferred  Stock"  means  the  Voting  Preferred  Stock of the
Company.

         "Warrant" has the meaning given to such term in the Purchase Agreement.

         2.  Dividends.

         (a) The Preferred A1 Holders shall be entitled to receive, out of funds
legally available therefor, cumulative dividends on the Liquidation Value at the
Rate per Annum and for the periods set forth below:


                                                            Rate Per
         Period                                              Annum
         ------                                             --------
Until June 30, 2000....................................       9.0%
July 1, 2000 to June 30, 2001..........................      11.0%
July 1, 2001 to June 30, 2002..........................      12.0%
July 1, 2002 to June 30, 2003..........................      13.0%
July 1, 2003 to June 30, 2004..........................      14.0%
July 1, 2004 to June 30, 2005..........................      15.0%

(subject to appropriate  adjustments in the event of any stock  dividend,  stock
split, combination or other similar recapitalization  affecting such shares) per
share per annum, and no more,  payable in preference and priority to any payment
of any cash dividend on Common Stock or any other shares of capital stock of the
Company other than the Class A Preferred Stock, Class B Preferred Stock, Class C
Preferred Stock,  Class A1 Preferred Stock,  Class A2 Preferred Stock,  Class B1
Preferred  Stock,  Class C1 Preferred  Stock and Class D Preferred  Stock (which
shall rank on a par with the Class A1 Preferred  Stock) or other class or series
of stock  ranking on a par with,  or senior to the Class A1  Preferred  Stock in
respect  of  dividends  (such  Common  Stock  and  other  inferior  stock  being
collectively referred to as "Junior Stock"), when and as declared by the Board.

         (b) Such dividends  shall accrue with respect to each share of Class A1
Preferred  Stock from the date on which such share is issued and outstanding and
thereafter  shall be deemed to accrue  from day to day  whether or not earned or
declared and whether or not there exists profits, surplus or other


                                        5



<PAGE>



funds legally available for the payment of dividends, and shall be cumulative so
that if such dividends on the Class A1 Preferred Stock shall not have been paid,
or declared and set apart for  payment,  the  deficiency  shall be fully paid or
declared and set apart for payment before any dividend shall be paid or declared
or set apart for any Junior Stock and before any purchase or  acquisition of any
Junior Stock is made by the Company,  except the repurchase of Junior Stock from
employees of the Company upon termination of employment or as otherwise approved
by the Requisite Preferred A1 Holders.

         (c) Dividends  shall be payable in cash,  quarterly in arrears.  To the
extent  dividends are not paid on each  September 30,  December 31, March 31 and
June 30, (each a "Dividend  Reference Date") all dividends which have accrued on
each share of Class A1 Preferred Stock during the three-month period (or shorter
period  in the  case  of the  first  or last  period)  ending  on each  Dividend
Reference  Date will be added to the  Liquidation  Value of such  share and will
remain a part  thereof  until  such  dividends  are  paid in full in cash.  Each
dividend  paid in cash shall be mailed to the  holders of record of the Class A1
Preferred Stock as their names and addresses appear on the share register of the
Company or at the office of the  transfer  agent on the  corresponding  dividend
payment date.

         3.  Liquidation.

         (a) In the event of any  Liquidation  of the Company,  the Preferred A1
Holders  shall be entitled  to be paid out of the assets of the Company  legally
available for distribution to its stockholders, after and subject to the payment
in full of all  amounts  required  to be  distributed  to the  holders of Voting
Preferred Stock and any other class or series of stock of the Company ranking on
liquidation   prior  and  in  preference   to  the  Class  A1  Preferred   Stock
(collectively  referred to as "Senior Preferred Stock"),  but before any payment
shall be made to the  holders  of  Junior  Stock by  reason  of their  ownership
thereof,  an  amount  equal  to the  Liquidation  Value  per  share  of Class A1
Preferred  Stock.  If upon any such  Liquidation  of the Company  the  remaining
assets of the Company  available for distribution to its  stockholders  shall be
insufficient  to pay the holders of shares of Class A1 Preferred  Stock the full
amount  to which  they  shall be  entitled,  the  holders  of shares of Class A1
Preferred  Stock and the holders of shares of Class A Preferred  Stock,  Class B
Preferred  Stock,  Class C Preferred Stock,  Class A2 Preferred Stock,  Class B1
Preferred Stock, Class C1 Preferred Stock, Class D Preferred Stock and any other
class or series of stock  ranking on  liquidation  on a parity with the Class A1
Preferred Stock shall share ratably in any  distribution of the remaining assets
and funds of the Company in  proportion  to the  respective  amounts which would
otherwise  be  payable  in  respect  of  the  shares  held  by  them  upon  such
distribution  if all amounts payable on or with respect to such shares were paid
in full.

         (b) The merger or  consolidation  of the Company  into or with  another
corporation  which results in the exchange of outstanding  shares of the Company
for securities or other  consideration  issued or paid or caused to be issued or
paid by such other corporation or an affiliate thereof (except if such merger or
consolidation  does not  result in the  transfer  of more than 50 percent of the
voting  securities of the Company),  or the sale of all or substantially all the
assets of the Company,  shall be deemed to be a  Liquidation  of the Company for
purposes of this Section 3 of this subsection A1, unless the Requisite Preferred
A1 Holders vote otherwise. The amount deemed distributed to the holders of Class
A1 Preferred  Stock upon any such merger or  consolidation  shall be the cash or
the value of the property,

                                        6



<PAGE>



rights and/or  securities  distributed to such holders by the acquiring  person,
firm or other entity.  The value of such  property,  rights or other  securities
shall be determined in good faith by the Board.

         4.  Voting Rights.

         (a) Except as required by law and pursuant to  paragraphs  (b), (c) and
(d) below, the Preferred A1 Holders shall not be entitled to vote.

         (b) The Company shall not, without the affirmative  consent or approval
of the Requisite Preferred A1 Holders:

                  (i) in any manner authorize, issue or sell any shares of Class
         A1  Preferred   Stock  other  than  as  contemplated  by  the  Purchase
         Agreement, the Preferred Shareholder Agreement or this Determination of
         Preferred Stock;

                  (ii)  reclassify,  cancel or in any manner alter or change the
         designations,  preferences,  privileges or relative,  optional or other
         special  rights,  or the  qualifications,  limitations or  restrictions
         thereof, of the Class A1 Preferred Stock;

                  (iii) amend, repeal or modify any provision of this subsection
         A1 of this Determination of Preferred Stock; or

                  (iv) amend,  repeal or modify any provision of the Articles of
         Incorporation  or By-laws in a manner that would  adversely  affect the
         preferences, privileges or rights of the Preferred A1 Holders.

         (c)(i) The Company hereby covenants that the Requisite  Preferred A1/A2
         Holders  shall  have the right to have that  number of  representatives
         (each such  representative,  an  "Observer")  determined as hereinafter
         provided  present at all  meetings of the Board.  Such right shall from
         time to time be  exercisable  by  delivery  to the  Company  of written
         notice from the Requisite  Preferred A1/A2 Holders specifying the names
         of such Observers.  The number of Observers shall at all times and from
         time to time be equal to that  number of nominees to the Board that the
         Preferred  A1/A2 Holders are then entitled to designate less the number
         of such nominees as are then members of the Board.

                  (ii) The  Company  will give each  Observer  reasonable  prior
         notice (it being  agreed that the same prior  notice given to the Board
         shall be deemed reasonable prior notice) in any manner permitted in the
         Company's By-laws for notices to directors of the time and place of any
         proposed meeting of the Board, such notice in all cases to include true
         and  complete  copies of all  documents  furnished  to any  director in
         connection with such meeting. Each such Observer will be entitled to be
         present in person as an observer  at any such  meeting or, if a meeting
         is held by telephone conference, to participate therein for the purpose
         of listening thereto.


                                        7



<PAGE>



                  (iii) The Company will deliver to each Observer  copies of all
         papers which may be  distributed  from time to time to the directors of
         the  Company at such time as such  papers are so  distributed  to them,
         including copies of any written consent.

         (d) The Company shall not, without the affirmative  consent or approval
of the Requisite Preferred Holders:

                  (i) take any action,  or enter into or authorize  any material
         agreement or material transaction, other than in the ordinary course of
         business and consistent with past practice;

                  (ii)  agree to acquire  the stock or assets  of, or  otherwise
         agree to any  joint  venture,  licensing  arrangement  with,  any other
         person.

                  (iii) enter into any  arrangement  which would  reasonably  be
         expected to result in a Change of Control;

                  (iv) sell,  transfer,  convey,  assign or otherwise dispose of
         any of its material  assets or  properties,  or spinoff or splitoff any
         material assets, properties or Securities except sales of inventory and
         used,  obsolete,  worn out or unnecessary  equipment or fixtures in the
         ordinary course of business and consistent with past practice;

                  (v) sell,  transfer,  convey,  assign,  license  or  otherwise
         dispose of any significant portion of its Intellectual Property Rights;

                  (vi) except in the ordinary  course of business and consistent
         with past  practice,  waive,  release  or cancel  any  material  claims
         against  third  parties or material  debts owing to it, or any material
         rights which have any material value;

                  (vii) make any  material  changes in its  accounting  systems,
         policies,  principles  or practices  except in the  ordinary  course of
         business and consistent with past practice;

                  (viii) enter into,  authorize,  or permit any transaction with
         Affiliates,   or  modify  in  any  material   respect  the  employment,
         compensation or other  arrangements with the executive  officers of the
         Company or any Subsidiary;

                  (ix) authorize for issuance,  issue, sell, deliver or agree or
         commit to issue,  sell or deliver  (whether  through  the  issuance  or
         granting of options, warrants or exchangeable Securities,  commitments,
         subscriptions,  rights to purchase or otherwise)  any shares of capital
         stock or any other  Securities  of the  Company or any  Subsidiary,  or
         amend any of the terms of any such capital stock or other Securities;

                  (x) split,  combine,  or reclassify  any shares of its capital
         stock,  declare, set aside or pay any dividend (other than dividends on
         the Preferred Stock) or other  distribution  (whether in


                                        8



<PAGE>


         cash,  stock or property or any combination  thereof) in respect of its
         capital  stock,  or redeem or  otherwise  acquire any capital  stock or
         other Securities of the Company or any Subsidiary;

                  (xi) except in the ordinary  course of business and consistent
         with past practice,  make any borrowings,  incur any  Indebtedness,  or
         assume,   guarantee,   endorse  or  otherwise  become  liable  (whether
         directly,  contingently  or otherwise) for the obligations of any other
         Person;

                  (xii) except in the ordinary course of business and consistent
         with past practice,  make any loans,  advances or capital contributions
         to, or investments in, any other Person.

         5.  Redemption.

         (a) Subject to the Company  having  funds  legally  available  for such
purpose,  the Company  shall  redeem all of the shares of the Class A1 Preferred
Stock then outstanding,  on the Maturity Date. The per share redemption price at
which  shares of Class A1  Preferred  Stock are to be redeemed  pursuant to this
Section 5(a) of this subsection A1 shall be equal to the Liquidation  Value (the
"Redemption Price").

         (b) In the event the Company or any of its  Subsidiaries  consummates a
public or private offering for cash of capital stock or other equity  interests,
the Company  shall be required to apply 50% of the Net Proceeds of such offering
toward the redemption of shares of Preferred Stock (other than Voting  Preferred
Stock),  on a pro rata basis (determined on the basis of the number of shares of
Preferred Stock (other than Voting  Preferred  Stock),  held by such holder over
the total  number of shares of  Preferred  Stock  (other than  Voting  Preferred
Stock) outstanding) from the Holders of Preferred Stock at the Redemption Price.

         (c) In addition to the Company's  mandatory  redemption  obligations as
set forth in Sections 5(a) and (b) of this subsection A1, the Company shall have
the  option to redeem a  minimum  of $1  million  of  Original  Cost of Class A1
Preferred Stock and integral multiples of $100,000 thereafter at the Liquidation
Value thereof.  Any shares to be redeemed  pursuant to this Section 5(c) of this
subsection  A1 shall be selected for  redemption at the  discretion  of, or in a
manner approved by, the Board.  Notwithstanding  any of the other  provisions of
this  Section 5 of this  subsection  A1, so long as any  Preferred  A1/A2 Holder
remains a  Significant  Holder,  the Company shall not be permitted to redeem or
retire all  outstanding  shares of Class A1 Preferred  Stock,  but shall instead
allow such Significant  Holder to remain the holder of one (1) share of Class A1
Preferred Stock.

         (d) On and after any date set for redemption  (the  "Redemption  Date")
pursuant to this Section 5 of this  subsection A1 (unless  default shall be made
by the  Company in the  payment of the  Redemption  Price,  in which  event such
rights shall be exercisable until such default is cured),  all rights in respect
of the shares of the Class A1 Preferred  Stock to be redeemed,  except the right
to receive the  Redemption  Price,  shall cease and  terminate,  and such shares
shall no longer be deemed to be  outstanding,  whether  or not the  certificates
representing such shares have been received by the Company.


                                        9



<PAGE>


         (e) Any  communication  or notice relating to redemption given pursuant
to this Section 5 of this  subsection A1 shall be sent by first-class  certified
mail, return receipt requested,  postage prepaid, to the Preferred A1 Holders at
their respective addresses as the same shall appear on the books of the Company,
or to the Company at the address of its principal,  or registered office, as the
case may be.

         (f) At any time on or after  the  Redemption  Date,  the  Preferred  A1
Holders shall be entitled to receive the Redemption  Price upon actual  delivery
to the Company or its agents of the certificates  representing the shares of the
Class A1 Preferred Stock to be redeemed.

         (g) Any redemption  payments by the Company  pursuant to this Section 5
of this subsection A1 shall be paid in cash.

         (h) Any  shares  of Class A1  Preferred  Stock  which are  redeemed  or
otherwise  acquired by the Company  shall be canceled and shall not be reissued,
sold or transferred  as Class A1 Preferred  Stock and the Board shall reduce the
number of authorized  shares of Class A1 Preferred Stock by the number of shares
so redeemed or otherwise acquired.

         6.  Maturity Default.

         (a) The occurrence of any of the following  events of default shall, at
the option of the Requisite Preferred Holders, constitute a Maturity Default:

                  (i) the Company fails  to comply in  any material respect with
         any of its  obligations under  any of  the Transaction Documents or the
         Fundamental Documents;

                  (ii) a material  default occurs under any mortgage,  indenture
         or other  instrument  under which there may be secured or evidenced any
         indebtedness  for money borrowed by the Company if the principal amount
         of such indebtedness aggregates $1,000,000 or more; or

                  (iii) the  Company  fails to  comply  with the  provisions  of
         Section 7.2(g)(iv) of the Purchase Agreement.

         (b) A default under clauses (a)(i) or (a)(ii) is not a Maturity Default
until the Company does not cure the default within 30 days of the Company having
Knowledge of such default. When a default is cured, it ceases.

         (c) The Requisite  Preferred Holders by notice to the Company may waive
an existing default or Maturity Default and its consequences.  When a default or
Maturity Default is waived, it ceases.

         7.       Exchange.

         (a)  Subject  to the  requirements  of  Section  500 of the  California
Corporation Law, the Requisite Preferred A1 Holders and the Company may agree at
any  time  and from  time to time  following  the  Exchange  Triggering  Date to
exchange  all  or  any  portion  of the  shares  of  Class  A1


                                       10



<PAGE>



Preferred  Stock  outstanding  into the Company's  Subordinated  Debentures (the
"Notes")  to be issued  substantially  in the form  attached as Exhibit D to the
Purchase  Agreement in the amount of $1,000  principal  amount of Notes for each
$1,000 of Liquidation Value of Class A1 Preferred Stock; provided, however, that
no such exchange may be consummated unless full cumulative dividends (including,
without duplication,  full cumulative dividends pro rata for the elapsed portion
of the current  dividend  period) on the Class A1 Preferred Stock to the date of
exchange shall have been paid. Notes shall be issued only in integral  multiples
of  $1,000  at the time of  exchange.  If any  additional  amounts  ("Fractional
Principal  Amounts")  would  otherwise  be issuable to any holders of  Preferred
Stock, then the Company shall, in lieu of issuing a Fractional  Principal Amount
therefor,  pay in full payment of the Company's  obligation with respect to such
Fractional  Principal  Amounts,  to each  Preferred  A1 Holder an amount in cash
equal to such Fractional Principal Amount. Any and all exchange rights set forth
in this  Section  7 of this  subsection  A1  shall  be  deemed  to be a right of
redemption  subject to Section  402 of the  California  Corporation  Law. In the
event that the  Company  exercises  its option to  exchange  any  portion of the
outstanding  shares of Class A1  Preferred  Stock  into Notes  pursuant  to this
Section 7 of this  subsection A1, such shares to be exchanged  shall be selected
for  exchange  at the  discretion  of, or in a manner  approved  by,  the Board.
Notwithstanding any of the other provisions of this Section 7 of this subsection
A1, so long as any Preferred A1 Holder remains a Significant Holder, the Company
shall not be permitted to exchange all outstanding  shares of Class A1 Preferred
Stock, but shall instead allow such  Significant  Holder to remain the holder of
one (1) share of Class A1 Preferred Stock.

         (b) Any exchange pursuant to this Section 7 shall be made upon not less
than 30 days' notice prior to the date fixed for exchange (the "Exchange Date").
The notice  given shall state  that,  upon  surrender  of their  certificate  or
certificates  to the  Company,  the  holders  of Class A1  Preferred  Stock will
receive  Notes in the  amount set forth in Section  7(a) of this  subsection  A1
above and that, at the close of business on the Exchange Date, all rights of the
holders with respect to such shares so called for exchange  shall cease,  except
the right to receive  the Notes in the amount set forth in Section  7(a) of this
subsection A1. Except as may be otherwise  required by applicable  law, the form
of the Notes may only be amended or supplemented  before the first Exchange Date
which occurs with the affirmative vote or consent of the Requisite  Preferred A1
Holders.  On or after such first Exchange Date, the Notes may only be amended or
supplemented  as provided in the Notes.  The Company  will cause the Notes to be
authenticated  on the  Exchange  Date,  and the Company will pay interest on the
Notes  at the rate and on the  dates  specified  in  Notes  from and  after  the
relevant Exchange Date.

A2.  Class A2 Preferred Stock.
     ------------------------

         1. Definitions.  As used in this subsection A2 of this Determination of
Preferred Stock,  capitalized  terms not otherwise defined herein shall have the
meanings  given to such  terms  in the  Purchase  Agreement.  In  addition,  the
following capitalized terms have the following meanings:

         "Articles of Incorporation"  means the Articles of Incorporation of the
Company as amended and restated and in effect at the time in question.

         "By-laws"  means the By-laws of the  Company,  as amended and in effect
from time to time.

                                       11



<PAGE>




         "Board" means the Board of Directors of the Company.

         "Class A Preferred Stock" means the Class A Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Class B Preferred Stock" means the Class B Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Class C Preferred Stock" means the Class C Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Common  Stock" means,  collectively,  all of the Common Stock,  no par
value, of the Company of any class,  and any other class of capital stock of the
Company hereafter authorized that is not limited to a fixed sum or percentage of
par or  stated  value  in  respect  to the  rights  of the  holders  thereof  to
participate in dividends or in the  distribution of assets upon any liquidation,
dissolution or winding up of the Company.

         "Dividend  Reference  Date" has the  meaning  ascribed to it in Section
A2.2(c).

         "Exchange Triggering Date" means December 31, 1999.

         "Liquidation"  means, subject to the provisions of Section 3(b) of this
subsection A2, any voluntary or involuntary liquidation,  dissolution or winding
up of the affairs of the Company.

         "Liquidation  Value"  shall mean  Original  Cost plus any  accrued  and
unpaid dividends as determined pursuant to Section 2(c) of this subsection A2.

         "Maturity Date" means,  with respect to any Class A2 Preferred Stock or
Notes issued in exchange for Class A2 Preferred  Stock, the earliest to occur of
(i) a Maturity  Default,  (ii) a Change of  Control or (iii) June 30,  2005 (the
"Calendar Maturity Date").

         "Maturity  Default" shall have the meaning set forth in Section 6(a) of
this subsection A2.

         "Net Proceeds" of any transaction shall mean the gross proceeds of such
transaction net of any commissions or transaction  fees and expenses paid by the
Company in connection with such transaction.

         "Original Cost" means,  with respect to any share of Class A2 Preferred
Stock, $1,000.

         "Person"  shall  be  construed   broadly  and  shall  include   without
limitation an individual, a partnership, a corporation,  an association, a joint
stock  company,  a limited  liability  company,  a trust,  a joint  venture,  an
unincorporated organization and a Governmental Authority.

         "Preferred A1/A2 Holders" means, collectively, Preferred A1 Holders and
Preferred A2 Holders.

                                       12

<PAGE>



         "Preferred A1 Holders" means holders of Class A1 Preferred Stock.

         "Preferred A2 Holders" means holders of Class A2 Preferred Stock.

         "Preferred  Shareholder Agreement" shall mean the Preferred Shareholder
Agreement, dated as of February 17, 1999, between the Company and the Holder (as
defined therein).

         "Preferred  Stock" means,  collectively,  the Class A Preferred  Stock,
Class B Preferred  Stock,  Class C Preferred  Stock,  Class A1 Preferred  Stock,
Class A2 Preferred Stock,  Class B1 Preferred  Stock,  Class C1 Preferred Stock,
Class D Preferred Stock and Voting Preferred Stock.

         "Purchase Agreement" means the Securities Purchase Agreement,  dated as
of August 7, 1998, between the Company and the Investor (as defined therein), as
amended, restated or otherwise modified from time to time.

         "Rate per Annum"  means the  specified  rate per annum  computed on the
basis of a 360-day year;  provided,  that in the event dividends are not paid in
full in cash on any  applicable  Dividend  Reference Date or upon any Redemption
Date,  the Rate per Annum for the  applicable  period  shall be increased by 500
basis points (e.g., a 9.0% Rate per Annum would be increased to a 14.0% Rate per
Annum) until such dividends are paid in full in cash.

         "Redemption Price" has the meaning ascribed to it in Section A2.5(a) of
this Determination of Preferred Stock.

         "Requisite  Preferred  A1/A2 Holders" means the holders  representing a
majority of the then outstanding shares of Class A1 Preferred Stock and Class A2
Preferred Stock voting together as a group.

         "Requisite  Preferred  A2  Holders"  means the holders  representing  a
majority of the then outstanding shares of Class A2 Preferred Stock.

         "Requisite Preferred Holders" means the holders representing a majority
of the then outstanding  shares of Class A1 Preferred Stock,  Class A2 Preferred
Stock,  Class B1 Preferred Stock, Class C1 Preferred Stock and Class D Preferred
Stock voting together as a group.

         "Transaction Documents" means the Purchase Agreement,  the Exhibits and
Schedules attached thereto in their final and executed form, as applicable,  and
each of the agreements contemplated thereby.

         "Voting  Preferred  Stock"  means  the  Voting  Preferred  Stock of the
Company.

         "Warrant" has the meaning given to such term in the Purchase Agreement.

                                       13


<PAGE>

         2.  Dividends.

         (a) The Preferred A2 Holders shall be entitled to receive, out of funds
legally available therefor, cumulative dividends on the Liquidation Value at the
Rate per Annum and for the periods set forth below:


                                                            Rate Per
         Period                                              Annum
         ------                                             --------
Until June 30, 2000....................................       9.0%
July 1, 2000 to June 30, 2001..........................      11.0%
July 1, 2001 to June 30, 2002..........................      12.0%
July 1, 2002 to June 30, 2003..........................      13.0%
July 1, 2003 to June 30, 2004..........................      14.0%
July 1, 2004 to June 30, 2005..........................      15.0%

(subject to appropriate  adjustments in the event of any stock  dividend,  stock
split, combination or other similar recapitalization  affecting such shares) per
share per annum, and no more,  payable in preference and priority to any payment
of any cash dividend on Common Stock or any other shares of capital stock of the
Company other than the Class A Preferred Stock, Class B Preferred Stock, Class C
Preferred Stock,  Class A1 Preferred Stock,  Class A2 Preferred Stock,  Class B1
Preferred  Stock,  Class C1 Preferred  Stock and Class D Preferred  Stock (which
shall rank on a par with the Class A2 Preferred  Stock) or other class or series
of stock  ranking on a par with,  or senior to the Class A2  Preferred  Stock in
respect  of  dividends  (such  Common  Stock  and  other  inferior  stock  being
collectively referred to as "Junior Stock"), when and as declared by the Board.

         (b) Such dividends  shall accrue with respect to each share of Class A2
Preferred  Stock from the date on which such share is issued and outstanding and
thereafter  shall be deemed to accrue  from day to day  whether or not earned or
declared and whether or not there exists profits, surplus or other funds legally
available for the payment of dividends,  and shall be cumulative so that if such
dividends on the Class A2 Preferred  Stock shall not have been paid, or declared
and set apart for payment,  the  deficiency  shall be fully paid or declared and
set apart for payment before any dividend shall be paid or declared or set apart
for any Junior Stock and before any purchase or  acquisition of any Junior Stock
is made by the Company,  except the repurchase of Junior Stock from employees of
the Company upon  termination  of  employment  or as  otherwise  approved by the
Requisite Preferred A2 Holders.

         (c) Dividends  shall be payable in cash,  quarterly in arrears.  To the
extent  dividends are not paid on each  September 30,  December 31, March 31 and
June 30, (each a "Dividend  Reference Date") all dividends which have accrued on
each share of Class A2 Preferred Stock during the three-month period (or shorter
period  in the  case  of the  first  or last  period)  ending  on each  Dividend
Reference  Date will be added to the  Liquidation  Value of such  share and will
remain a part  thereof  until  such  dividends  are  paid in full in cash.  Each
dividend  paid in cash shall be mailed to the  holders of record of the

                                       14



<PAGE>



Class A2  Preferred  Stock as their  names  and  addresses  appear  on the share
register  of  the  Company  or at  the  office  of  the  transfer  agent  on the
corresponding dividend payment date.

         3.  Liquidation.

         (a) In the event of any  Liquidation  of the Company,  the Preferred A2
Holders  shall be entitled  to be paid out of the assets of the Company  legally
available for distribution to its stockholders, after and subject to the payment
in full of all  amounts  required  to be  distributed  to the  holders of Voting
Preferred Stock and any other class or series of stock of the Company ranking on
liquidation   prior  and  in  preference   to  the  Class  A2  Preferred   Stock
(collectively  referred to as "Senior Preferred Stock"),  but before any payment
shall be made to the  holders  of  Junior  Stock by  reason  of their  ownership
thereof,  an  amount  equal  to the  Liquidation  Value  per  share  of Class A2
Preferred  Stock.  If upon any such  Liquidation  of the Company  the  remaining
assets of the Company  available for distribution to its  stockholders  shall be
insufficient  to pay the holders of shares of Class A2 Preferred  Stock the full
amount  to which  they  shall be  entitled,  the  holders  of shares of Class A2
Preferred  Stock and the holders of shares of Class A Preferred  Stock,  Class B
Preferred  Stock,  Class C Preferred Stock,  Class A1 Preferred Stock,  Class B1
Preferred Stock, Class C1 Preferred Stock, Class D Preferred Stock and any other
class or series of stock  ranking on  liquidation  on a parity with the Class A2
Preferred Stock shall share ratably in any  distribution of the remaining assets
and funds of the Company in  proportion  to the  respective  amounts which would
otherwise  be  payable  in  respect  of  the  shares  held  by  them  upon  such
distribution  if all amounts payable on or with respect to such shares were paid
in full.

         (b) The merger or  consolidation  of the Company  into or with  another
corporation  which results in the exchange of outstanding  shares of the Company
for securities or other  consideration  issued or paid or caused to be issued or
paid by such other corporation or an affiliate thereof (except if such merger or
consolidation  does not  result in the  transfer  of more than 50 percent of the
voting  securities of the Company),  or the sale of all or substantially all the
assets of the Company,  shall be deemed to be a  Liquidation  of the Company for
purposes of this Section 3 of this subsection A2, unless the Requisite Preferred
A2 Holders vote otherwise. The amount deemed distributed to the holders of Class
A2 Preferred  Stock upon any such merger or  consolidation  shall be the cash or
the value of the property,  rights and/or securities distributed to such holders
by the  acquiring  person,  firm or other  entity.  The value of such  property,
rights or other securities shall be determined in good faith by the Board.

         4.  Voting Rights.

         (a) Except as required by law and pursuant to  paragraphs  (b), (c) and
(d) below, the Preferred A2 Holders shall not be entitled to vote.

         (b) The Company shall not, without the affirmative  consent or approval
of the Requisite Preferred A2 Holders:

                  (i) in any manner authorize, issue or sell any shares of Class
         A2  Preferred   Stock  other  than  as  contemplated  by  the  Purchase
         Agreement, the Preferred Shareholder Agreement or this Determination of
         Preferred Stock;

                                       15



<PAGE>



                  (ii)  reclassify,  cancel or in any manner alter or change the
         designations,  preferences,  privileges or relative,  optional or other
         special  rights,  or the  qualifications,  limitations or  restrictions
         thereof, of the Class A2 Preferred Stock;

                  (iii) amend, repeal or modify any provision of this subsection
         A2 of this Determination of Preferred Stock; or

                  (iv) amend,  repeal or modify any provision of the Articles of
         Incorporation  or By-laws in a manner that would  adversely  affect the
         preferences, privileges or rights of the Preferred A2 Holders.

         (c)(i) The Company hereby covenants that the Requisite  Preferred A1/A2
         Holders  shall  have the right to have that  number of  representatives
         (each such  representative,  an  "Observer")  determined as hereinafter
         provided  present at all  meetings of the Board.  Such right shall from
         time to time be  exercisable  by  delivery  to the  Company  of written
         notice from the Requisite  Preferred A1/A2 Holders specifying the names
         of such Observers.  The number of Observers shall at all times and from
         time to time be equal to that  number of nominees to the Board that the
         Preferred  A1/A2 Holders are then entitled to designate less the number
         of such nominees as are then members of the Board.

                  (ii) The  Company  will give each  Observer  reasonable  prior
         notice (it being  agreed that the same prior  notice given to the Board
         shall be deemed reasonable prior notice) in any manner permitted in the
         Company's By-laws for notices to directors of the time and place of any
         proposed meeting of the Board, such notice in all cases to include true
         and  complete  copies of all  documents  furnished  to any  director in
         connection with such meeting. Each such Observer will be entitled to be
         present in person as an observer  at any such  meeting or, if a meeting
         is held by telephone conference, to participate therein for the purpose
         of listening thereto.

                  (iii) The Company will deliver to each Observer  copies of all
         papers which may be  distributed  from time to time to the directors of
         the  Company at such time as such  papers are so  distributed  to them,
         including copies of any written consent.

         (d) The Company shall not, without the affirmative  consent or approval
of the Requisite Preferred Holders:

                  (i) take any action,  or enter into or authorize  any material
         agreement or material transaction, other than in the ordinary course of
         business and consistent with past practice;

                  (ii)  agree to acquire  the stock or assets  of, or  otherwise
         agree to any  joint  venture,  licensing  arrangement  with,  any other
         person.

                  (iii) enter into any  arrangement  which would  reasonably  be
         expected to result in a Change of Control;


                                       16

<PAGE>


                  (iv) sell,  transfer,  convey,  assign or otherwise dispose of
         any of its material  assets or  properties,  or spinoff or splitoff any
         material assets, properties or Securities except sales of inventory and
         used,  obsolete,  worn out or unnecessary  equipment or fixtures in the
         ordinary course of business and consistent with past practice;

                  (v) sell,  transfer,  convey,  assign,  license  or  otherwise
         dispose of any significant portion of its Intellectual Property Rights;

                  (vi) except in the ordinary  course of business and consistent
         with past  practice,  waive,  release  or cancel  any  material  claims
         against  third  parties or material  debts owing to it, or any material
         rights which have any material value;

                  (vii) make any  material  changes in its  accounting  systems,
         policies,  principles  or practices  except in the  ordinary  course of
         business and consistent with past practice;

                  (viii) enter into,  authorize,  or permit any transaction with
         Affiliates,   or  modify  in  any  material   respect  the  employment,
         compensation or other  arrangements with the executive  officers of the
         Company or any Subsidiary;

                  (ix) authorize for issuance,  issue, sell, deliver or agree or
         commit to issue,  sell or deliver  (whether  through  the  issuance  or
         granting of options, warrants or exchangeable Securities,  commitments,
         subscriptions,  rights to purchase or otherwise)  any shares of capital
         stock or any other  Securities  of the  Company or any  Subsidiary,  or
         amend any of the terms of any such capital stock or other Securities;

                  (x) split,  combine,  or reclassify  any shares of its capital
         stock,  declare, set aside or pay any dividend (other than dividends on
         the Preferred Stock) or other  distribution  (whether in cash, stock or
         property or any  combination  thereof) in respect of its capital stock,
         or redeem or otherwise acquire any capital stock or other Securities of
         the Company or any Subsidiary;

                  (xi) except in the ordinary  course of business and consistent
         with past practice,  make any borrowings,  incur any  Indebtedness,  or
         assume,   guarantee,   endorse  or  otherwise  become  liable  (whether
         directly,  contingently  or otherwise) for the obligations of any other
         Person;

                  (xii) except in the ordinary course of business and consistent
         with past practice,  make any loans,  advances or capital contributions
         to, or investments in, any other Person.

         5.       Redemption.

         (a) Subject to the Company  having  funds  legally  available  for such
purpose,  the Company,  on the Maturity Date, shall have the option of redeeming
all the shares of outstanding  Class A2 Preferred Stock for cash as described in
Section  5(d) - (h) below.  If the  Company  does not redeem  such shares on the
Maturity  Date,  the Company  shall pay full  cumulative  dividends  (including,
without duplication,  full cumulative dividends pro rata for the elapsed portion
of the current  dividend period) on

                                       17



<PAGE>


the Class A2 Preferred Stock to the Maturity Date and,  immediately  thereafter,
each share of Class A2 Preferred Stock shall automatically be converted into one
share of Class D Preferred Stock. The per share redemption price at which shares
of Class A2 Preferred Stock are to be redeemed  pursuant to this Section 5(a) of
this  subsection  A2 shall be equal to the  Liquidation  Value (the  "Redemption
Price").

         (b) In the event the Company or any of its  Subsidiaries  consummates a
public or private offering for cash of capital stock or other equity  interests,
the Company  shall be required to apply 50% of the Net Proceeds of such offering
toward the redemption of shares of Preferred Stock (other than Voting  Preferred
Stock),  on a pro rata basis (determined on the basis of the number of shares of
Preferred Stock (other than Voting  Preferred  Stock),  held by such holder over
the total  number of shares of  Preferred  Stock  (other than  Voting  Preferred
Stock) outstanding) from the Holders of Preferred Stock at the Redemption Price.

         (c) In addition to the Company's  obligations  as set forth in Sections
5(a) and (b) of this  subsection A2, the Company shall have the option to redeem
a  minimum  of $1  million  of  Original  Cost of Class A2  Preferred  Stock and
integral multiples of $100,000 thereafter at the Liquidation Value thereof.  Any
shares to be redeemed  pursuant to this Section 5(c) of this subsection A2 shall
be selected for redemption at the discretion of, or in a manner approved by, the
Board.  Notwithstanding  any of the other  provisions  of this Section 5 of this
subsection  A2, so long as any  Preferred  A1/A2  Holder  remains a  Significant
Holder,  the Company shall not be permitted to redeem or retire all  outstanding
shares of Class A2 Preferred  Stock,  but shall instead  allow such  Significant
Holder to remain the holder of one (1) share of Class A2 Preferred Stock.

         (d) On and after any date set for redemption  (the  "Redemption  Date")
pursuant to this Section 5 of this  subsection A2 (unless  default shall be made
by the  Company in the  payment of the  Redemption  Price,  in which  event such
rights shall be exercisable until such default is cured),  all rights in respect
of the shares of the Class A2 Preferred  Stock to be redeemed,  except the right
to receive the  Redemption  Price,  shall cease and  terminate,  and such shares
shall no longer be deemed to be  outstanding,  whether  or not the  certificates
representing such shares have been received by the Company.

         (e) Any  communication  or notice relating to redemption given pursuant
to this Section 5 of this  subsection A2 shall be sent by first-class  certified
mail, return receipt requested,  postage prepaid, to the Preferred A2 Holders at
their respective addresses as the same shall appear on the books of the Company,
or to the Company at the address of its principal,  or registered office, as the
case may be.

         (f) At any time on or after  the  Redemption  Date,  the  Preferred  A2
Holders shall be entitled to receive the Redemption  Price upon actual  delivery
to the Company or its agents of the certificates  representing the shares of the
Class A2 Preferred Stock to be redeemed.

         (g) Any redemption  payments by the Company  pursuant to this Section 5
of this subsection A2 shall be paid in cash.


                                       18


<PAGE>



         (h) Any  shares  of Class A2  Preferred  Stock  which are  redeemed  or
otherwise  acquired by the Company  shall be canceled and shall not be reissued,
sold or transferred  as Class A2 Preferred  Stock and the Board shall reduce the
number of authorized  shares of Class A2 Preferred Stock by the number of shares
so redeemed or otherwise required.

         6.       Maturity Default.

         (a) The occurrence of any of the following  events of default shall, at
the option of the Requisite Preferred Holders, constitute a Maturity Default:

                  (i) the  Company fails to  comply in any material respect with
         any of its  obligations  under any of the  Transaction Documents or the
         Fundamental Documents;

                  (ii) a material  default occurs under any mortgage,  indenture
         or other  instrument  under which there may be secured or evidenced any
         indebtedness  for money borrowed by the Company if the principal amount
         of such indebtedness aggregates $1,000,000 or more; or

                  (iii) the  Company  fails to  comply  with the  provisions  of
         Section 7.2(g)(iv) of the Purchase Agreement.

         (b) A default under clauses (a)(i) or (a)(ii) is not a Maturity Default
until the Company does not cure the default within 30 days of the Company having
Knowledge of such default. When a default is cured, it ceases.

         (c) The Requisite  Preferred Holders by notice to the Company may waive
an existing default or Maturity Default and its consequences.  When a default or
Maturity Default is waived, it ceases.

         7.       Exchange.

         (a)  Subject  to the  requirements  of  Section  500 of the  California
Corporation Law, the Requisite Preferred A2 Holders and the Company may agree at
any  time  and from  time to time  following  the  Exchange  Triggering  Date to
exchange  all  or  any  portion  of the  shares  of  Class  A2  Preferred  Stock
outstanding  into the  Company's  Subordinated  Debentures  (the  "Notes") to be
issued substantially in the form attached as Exhibit D to the Purchase Agreement
in the amount of $1,000 principal amount of Notes for each $1,000 of Liquidation
Value of Class A2 Preferred Stock; provided,  however, that no such exchange may
be consummated unless full cumulative dividends (including, without duplication,
full  cumulative  dividends  pro rata for the  elapsed  portion  of the  current
dividend  period) on the Class A2 Preferred  Stock to the date of exchange shall
have been paid.  Notes shall be issued only in integral  multiples  of $1,000 at
the time of exchange. If any additional amounts ("Fractional Principal Amounts")
would otherwise be issuable to any holders of Preferred Stock,  then the Company
shall, in lieu of issuing a Fractional  Principal Amount  therefor,  pay in full
payment of the Company's  obligation with respect to such  Fractional  Principal
Amount,  to each Preferred A2 Holder an amount in cash equal to such  Fractional
Principal  Amount.  Any and all  exchange  rights set forth in this Section 7 of
this  subsection  A2 shall be  deemed  to be a right of  redemption  subject  to
Section 402 of the

                                       19



<PAGE>



California  Corporation Law. In the event that the Company  exercises its option
to exchange any portion of the  outstanding  shares of Class A2 Preferred  Stock
into Notes  pursuant to this Section 7 of this  subsection A2, such shares to be
exchanged  shall be selected for exchange at the  discretion  of, or in a manner
approved  by, the Board.  Notwithstanding  any of the other  provisions  of this
Section 7 of this  subsection  A2, so long as any Preferred A2 Holder  remains a
Significant  Holder,  the  Company  shall  not  be  permitted  to  exchange  all
outstanding  shares of Class A2 Preferred  Stock,  but shall  instead allow such
Significant  Holder to remain the holder of one (1) share of Class A2  Preferred
Stock.

         (b) Any exchange pursuant to this Section 7 shall be made upon not less
than 30 days' notice prior to the date fixed for exchange (the "Exchange Date").
The notice  given shall state  that,  upon  surrender  of their  certificate  or
certificates  to the  Company,  the  holders  of Class A2  Preferred  Stock will
receive  Notes in the  amount set forth in Section  7(a) of this  subsection  A2
above and that, at the close of business on the Exchange Date, all rights of the
holders with respect to such shares so called for exchange  shall cease,  except
the right to receive  the Notes in the amount set forth in Section  7(a) of this
subsection A2. Except as may be otherwise  required by applicable  law, the form
of the Notes may only be amended or supplemented  before the first Exchange Date
which occurs with the affirmative vote or consent of the Requisite  Preferred A2
Holders.  On or after such first Exchange Date, the Notes may only be amended or
supplemented  as provided in the Notes.  The Company  will cause the Notes to be
authenticated  on the  Exchange  Date,  and the Company will pay interest on the
Notes at the rate and on the dates  specified  in the  Notes  from and after the
relevant Exchange Date.

B.  Class B1 Preferred Stock.
    -------------------------

         1.  Definitions.  As used in  subsection  B of  this  Determination  of
Preferred Stock,  capitalized  terms not otherwise defined herein shall have the
meanings  given to such  terms  in the  Purchase  Agreement.  In  addition,  the
following capitalized terms have the following meanings:

         "Articles of Incorporation"  means the Articles of Incorporation of the
Company as amended and restated and in effect at the time in question.

         "By-laws"  means the By-laws of the  Company,  as amended and in effect
from time to time.

         "Board" means the Board of Directors of the Company.

         "Class A Preferred Stock" means the Class A Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Class B Preferred Stock" means the Class B Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Class C Preferred Stock" means the Class C Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

                                       20



<PAGE>


         "Common  Stock" means,  collectively,  all of the Common Stock,  no par
value, of the Company of any class,  and any other class of capital stock of the
Company hereafter authorized that is not limited to a fixed sum or percentage of
par or  stated  value  in  respect  to the  rights  of the  holders  thereof  to
participate in dividends or in the  distribution of assets upon any liquidation,
dissolution or winding up of the Company.

         "Dividend  Reference  Date" has the  meaning  ascribed to it in Section
B.2(c).

         "Exchange Triggering Date" means December 31, 1999.

         "Liquidation"  means, subject to the provisions of Section 3(b) of this
subsection B, any voluntary or involuntary  liquidation,  dissolution or winding
up of the affairs of the Company.

         "Liquidation  Value"  shall mean  Original  Cost plus any  accrued  and
unpaid dividends as determined pursuant to Section 2(c) of this subsection B.

         "Maturity Date" means,  with respect to any Class B1 Preferred Stock or
Notes issued in exchange for Class B1 Preferred  Stock, the earliest to occur of
(i) a  Maturity  Default,  (ii) a Change  of  Control  or (iii)  June 30,  2005;
provided,  that the  Maturity  Date shall be December  31, 2000 with  respect to
Class  B1  Preferred  Stock  which  is  issued  in  connection  with  a  Spinoff
Transaction.

         "Maturity  Default" shall have the meaning set forth in Section 6(a) of
this subsection B.

         "Net Proceeds" of any transaction shall mean the gross proceeds of such
transaction net of any commissions or transaction  fees and expenses paid by the
Company in connection with such transaction.

         "Original Cost" means,  with respect to any share of Class B1 Preferred
Stock, $1,000.

         "Person"  shall  be  construed   broadly  and  shall  include   without
limitation an individual, a partnership, a corporation,  an association, a joint
stock  company,  a limited  liability  company,  a trust,  a joint  venture,  an
unincorporated organization and a Governmental Authority.

         "Preferred B1 Holders" means holders of Class B1 Preferred Stock.

         "Preferred  Shareholder Agreement" shall mean the Preferred Shareholder
Agreement, dated as of February 17, 1999, between the Company and the Holder (as
defined therein).

         "Preferred  Stock" means,  collectively,  the Class A Preferred  Stock,
Class B Preferred  Stock,  Class C Preferred  Stock,  Class A1 Preferred  Stock,
Class A2 Preferred Stock,  Class B1 Preferred  Stock,  Class C1 Preferred Stock,
Class D Preferred Stock and Voting Preferred Stock.

         "Purchase Agreement" means the Securities Purchase Agreement,  dated as
of August 7, 1998, between the Company and the Investor (as defined therein), as
amended, restated or otherwise modified from time to time.


                                       21


<PAGE>



         "Rate per Annum"  means the  specified  rate per annum  computed on the
basis of a 360-day year;  provided,  that in the event dividends are not paid in
full in cash on any  applicable  Dividend  Reference Date or upon any Redemption
Date,  the Rate per Annum for the  applicable  period  shall be increased by 500
basis points (e.g., a 9.0% Rate per Annum would be increased to a 14.0% Rate per
Annum) until such dividends are paid in full in cash.

         "Redemption  Price" has the meaning ascribed to it in Section B.5(a) of
this Determination of Preferred Stock.

         "Requisite  Preferred  B1  Holders"  means the holders  representing  a
majority of the then outstanding shares of Class B1 Preferred Stock.

         "Requisite Preferred Holders" means the holders representing a majority
of the then outstanding  shares of Class A1 Preferred Stock,  Class A2 Preferred
Stock,  Class B1 Preferred Stock, Class C1 Preferred Stock and Class D Preferred
Stock voting together as a group.

         "Transaction Documents" means the Purchase Agreement,  the Exhibits and
Schedules attached thereto in their final and executed form, as applicable,  and
each of the agreements contemplated thereby.

         "Voting  Preferred  Stock"  means  the  Voting  Preferred  Stock of the
Company.

         "Warrant" has the meaning given to such term in the Purchase Agreement.

         2.  Dividends.

         (a) The Preferred B1 Holders shall be entitled to receive, out of funds
legally available therefor, cumulative dividends on the Liquidation Value at the
Rate per Annum and for the periods set forth below:


                                                            Rate Per
         Period                                              Annum
         ------                                             --------
Until June 30, 2000....................................       9.0%
July 1, 2000 to June 30, 2001..........................      11.0%
July 1, 2001 to June 30, 2002..........................      12.0%
July 1, 2002 to June 30, 2003..........................      13.0%
July 1, 2003 to June 30, 2004..........................      14.0%
July 1, 2004 to June 30, 2005..........................      15.0%

(subject to appropriate  adjustments in the event of any stock  dividend,  stock
split, combination or other similar recapitalization  affecting such shares) per
share per annum, and no more,  payable in preference and priority to any payment
of any cash dividend on Common Stock or any other shares of capital stock of the
Company other than the Class A Preferred Stock, Class B Preferred Stock, Class C
Preferred

                                       22

<PAGE>


Stock,  Class A1 Preferred Stock,  Class A2 Preferred Stock,  Class B1 Preferred
Stock, Class C1 Preferred Stock and Class D Preferred Stock (which shall rank on
a par with the  Class B1  Preferred  Stock)  or other  class or  series of stock
ranking on a par with,  or senior to the Class B1 Preferred  Stock in respect of
dividends  (such  Common  Stock  and other  inferior  stock  being  collectively
referred to as "Junior Stock"), when and as declared by the Board.

         (b) Such dividends  shall accrue with respect to each share of Class B1
Preferred  Stock from the date on which such share is issued and outstanding and
thereafter  shall be deemed to accrue  from day to day  whether or not earned or
declared and whether or not there exists profits, surplus or other funds legally
available for the payment of dividends,  and shall be cumulative so that if such
dividends on the Class B1 Preferred  Stock shall not have been paid, or declared
and set apart for payment,  the  deficiency  shall be fully paid or declared and
set apart for payment before any dividend shall be paid or declared or set apart
for any Junior Stock and before any purchase or  acquisition of any Junior Stock
is made by the Company,  except the repurchase of Junior Stock from employees of
the Company upon  termination  of  employment  or as  otherwise  approved by the
Requisite Preferred B1 Holders.

         (c) Dividends  shall be payable in cash,  quarterly in arrears.  To the
extent  dividends are not paid on each  September 30,  December 31, March 31 and
June 30, (each a "Dividend  Reference Date") all dividends which have accrued on
each share of Class B1 Preferred Stock during the three-month period (or shorter
period  in the  case  of the  first  or last  period)  ending  on each  Dividend
Reference  Date will be added to the  Liquidation  Value of such  share and will
remain a part  thereof  until  such  dividends  are  paid in full in cash.  Each
dividend  paid in cash shall be mailed to the  holders of record of the Class B1
Preferred Stock as their names and addresses appear on the share register of the
Company or at the office of the  transfer  agent on the  corresponding  dividend
payment date.

         3.  Liquidation.

         (a) In the event of any  Liquidation  of the Company,  the Preferred B1
Holders  shall be entitled  to be paid out of the assets of the Company  legally
available for distribution to its stockholders, after and subject to the payment
in full of all  amounts  required  to be  distributed  to the  holders of Voting
Preferred Stock and any other class or series of stock of the Company ranking on
liquidation   prior  and  in  preference   to  the  Class  B1  Preferred   Stock
(collectively  referred to as "Senior Preferred Stock"),  but before any payment
shall be made to the  holders  of  Junior  Stock by  reason  of their  ownership
thereof,  an  amount  equal  to the  Liquidation  Value  per  share  of Class B1
Preferred  Stock.  If upon any such  Liquidation  of the Company  the  remaining
assets of the Company  available for distribution to its  stockholders  shall be
insufficient  to pay the holders of shares of Class B1 Preferred  Stock the full
amount  to which  they  shall be  entitled,  the  holders  of shares of Class B1
Preferred  Stock and the holders of shares of Class A Preferred  Stock,  Class B
Preferred  Stock,  Class C Preferred Stock,  Class A1 Preferred Stock,  Class A2
Preferred Stock, Class C1 Preferred Stock, Class D Preferred Stock and any other
class or series of stock  ranking on  liquidation  on a parity with the Class B1
Preferred Stock shall share ratably in any  distribution of the remaining assets
and funds of the Company in  proportion  to the  respective  amounts which would
otherwise  be  payable  in  respect  of  the  shares  held  by  them  upon  such
distribution  if all amounts payable on or with respect to such shares were paid
in full.

                                       24



<PAGE>



         (b) The merger or  consolidation  of the Company  into or with  another
corporation  which results in the exchange of outstanding  shares of the Company
for securities or other  consideration  issued or paid or caused to be issued or
paid by such other corporation or an affiliate thereof (except if such merger or
consolidation  does not  result in the  transfer  of more than 50 percent of the
voting  securities of the Company),  or the sale of all or substantially all the
assets of the Company,  shall be deemed to be a  Liquidation  of the Company for
purposes of this Section 3 of this subsection B, unless the Requisite  Preferred
B1 Holders vote otherwise. The amount deemed distributed to the holders of Class
B1 Preferred  Stock upon any such merger or  consolidation  shall be the cash or
the value of the property,  rights and/or securities distributed to such holders
by the  acquiring  person,  firm or other  entity.  The value of such  property,
rights or other securities shall be determined in good faith by the Board.

         4.  Voting Rights.

         (a) Except as required by law and pursuant to  paragraphs  (b), (c) and
(d) below, the Preferred B1 Holders shall not be entitled to vote.

         (b) The Company shall not, without the affirmative  consent or approval
of the Requisite Preferred B1 Holders:

                  (i) in any manner authorize, issue or sell any shares of Class
         B1  Preferred   Stock  other  than  as  contemplated  by  the  Purchase
         Agreement, the Preferred Shareholder Agreement or this Determination of
         Preferred Stock;

                  (ii)  reclassify,  cancel or in any manner alter or change the
         designations,  preferences,  privileges or relative,  optional or other
         special  rights,  or the  qualifications,  limitations or  restrictions
         thereof, of the Class B1 Preferred Stock;

                  (iii) amend, repeal or modify any provision of this subsection
         B of this Determination of Preferred Stock; or

                  (iv) amend,  repeal or modify any provision of the Articles of
         Incorporation  or By-laws in a manner that would  adversely  affect the
         preferences, privileges or rights of the Preferred B1 Holders.

         (c)(i) The Company  hereby  covenants  that the Requisite  Preferred B1
         Holders  shall  have the right to have that  number of  representatives
         (each such  representative,  an  "Observer")  determined as hereinafter
         provided  present at all  meetings of the Board.  Such right shall from
         time to time be  exercisable  by  delivery  to the  Company  of written
         notice from the Requisite  Preferred B1 Holders specifying the names of
         such  Observers.  The number of  Observers  shall at all times and from
         time to time be equal to that  number of nominees to the Board that the
         Preferred B1 Holders are then entitled to designate  less the number of
         such nominees as are then members of the Board.

                                       24


<PAGE>


                  (ii) The  Company  will give each  Observer  reasonable  prior
         notice (it being  agreed that the same prior  notice given to the Board
         shall be deemed reasonable prior notice) in any manner permitted in the
         Company's By-laws for notices to directors of the time and place of any
         proposed meeting of the Board, such notice in all cases to include true
         and  complete  copies of all  documents  furnished  to any  director in
         connection with such meeting. Each such Observer will be entitled to be
         present in person as an observer  at any such  meeting or, if a meeting
         is held by telephone conference, to participate therein for the purpose
         of listening thereto.

                  (iii) The Company will deliver to each Observer  copies of all
         papers which may be  distributed  from time to time to the directors of
         the  Company at such time as such  papers are so  distributed  to them,
         including copies of any written consent.

         (d) The Company shall not, without the affirmative  consent or approval
of the Requisite Preferred Holders:

                  (i) take any action,  or enter into or authorize  any material
         agreement or material transaction, other than in the ordinary course of
         business and consistent with past practice;

                  (ii)  agree to acquire  the stock or assets  of, or  otherwise
         agree to any  joint  venture,  licensing  arrangement  with,  any other
         person.

                  (iii) enter into any  arrangement  which would  reasonably  be
         expected to result in a Change of Control;

                  (iv) sell,  transfer,  convey,  assign or otherwise dispose of
         any of its material  assets or  properties,  or spinoff or splitoff any
         material assets, properties or Securities except sales of inventory and
         used,  obsolete,  worn out or unnecessary  equipment or fixtures in the
         ordinary course of business and consistent with past practice;

                  (v) sell,  transfer,  convey,  assign,  license  or  otherwise
         dispose of any significant portion of its Intellectual Property Rights;

                  (vi) except in the ordinary  course of business and consistent
         with past  practice,  waive,  release  or cancel  any  material  claims
         against  third  parties or material  debts owing to it, or any material
         rights which have any material value;

                  (vii) make any  material  changes in its  accounting  systems,
         policies,  principles  or practices  except in the  ordinary  course of
         business and consistent with past practice;

                  (viii) enter into,  authorize,  or permit any transaction with
         Affiliates,   or  modify  in  any  material   respect  the  employment,
         compensation or other  arrangements with the executive  officers of the
         Company or any Subsidiary;


                                       25

<PAGE>


                  (ix) authorize for issuance,  issue, sell, deliver or agree or
         commit to issue,  sell or deliver  (whether  through  the  issuance  or
         granting of options, warrants or exchangeable Securities,  commitments,
         subscriptions,  rights to purchase or otherwise)  any shares of capital
         stock or any other  Securities  of the  Company or any  Subsidiary,  or
         amend any of the terms of any such capital stock or other Securities;

                  (x) split,  combine,  or reclassify  any shares of its capital
         stock,  declare, set aside or pay any dividend (other than dividends on
         the Preferred Stock) or other  distribution  (whether in cash, stock or
         property or any  combination  thereof) in respect of its capital stock,
         or redeem or otherwise acquire any capital stock or other Securities of
         the Company or any Subsidiary;

                  (xi) except in the ordinary  course of business and consistent
         with past practice,  make any borrowings,  incur any  Indebtedness,  or
         assume,   guarantee,   endorse  or  otherwise  become  liable  (whether
         directly,  contingently  or otherwise) for the obligations of any other
         Person;

                  (xii) except in the ordinary course of business and consistent
         with past practice,  make any loans,  advances or capital contributions
         to, or investments in, any other Person.

         5.  Redemption.

         (a) Subject to the Company  having  funds  legally  available  for such
purpose,  the Company,  on the Maturity Date, shall have the option of redeeming
all the shares of outstanding  Class B1 Preferred Stock for cash as described in
Section  5(d) - (h) below.  If the  Company  does not redeem  such shares on the
Maturity  Date,  the Company  shall pay full  cumulative  dividends  (including,
without duplication,  full cumulative dividends pro rata for the elapsed portion
of the current  dividend period) on the Class B1 Preferred Stock to the Maturity
Date and, immediately  thereafter,  each share of Class B1 Preferred Stock shall
automatically  be converted into one share of Class D Preferred  Stock.  The per
share  redemption  price at which shares of Class B1  Preferred  Stock are to be
redeemed  pursuant to this Section 5(a) of this  subsection B1 shall be equal to
the Liquidation Value (the "Redemption Price").

         (b) In the event the Company or any of its  Subsidiaries  consummates a
public or private offering for cash of capital stock or other equity  interests,
the Company  shall be required to apply 50% of the Net Proceeds of such offering
toward the redemption of shares of Preferred Stock (other than Voting  Preferred
Stock),  on a pro rata basis (determined on the basis of the number of shares of
Preferred Stock (other than Voting  Preferred  Stock),  held by such holder over
the total  number of shares of  Preferred  Stock  (other than  Voting  Preferred
Stock) outstanding) from the Holders of Preferred Stock at the Redemption Price.

         (c) In addition to the Company's  obligations  as set forth in Sections
5(a) and (b) of this subsection B, the Company shall have the option to redeem a
minimum of $1 million of Original Cost of Class B1 Preferred  Stock and integral
multiples of $100,000 thereafter at the Liquidation Value thereof. Any shares to
be redeemed pursuant to this Section 5(c) of this subsection B shall be selected
for  redemption  at the  discretion  of, or in a manner  approved by, the Board.
Notwithstanding any of the other provisions of this Section 5 of this subsection
B, so long as any Preferred B1 Holder remains a

                                       26

<PAGE>


Significant  Holder,  the Company shall not be permitted to redeem or retire all
outstanding  shares of Class B1 Preferred  Stock,  but shall  instead allow such
Significant  Holder to remain the holder of one (1) share of Class B1  Preferred
Stock.

         (d) On and after any date set for redemption  (the  "Redemption  Date")
pursuant to this Section 5 of this subsection B (unless default shall be made by
the Company in the payment of the Redemption  Price,  in which event such rights
shall be exercisable until such default is cured),  all rights in respect of the
shares of the  Class B1  Preferred  Stock to be  redeemed,  except  the right to
receive the Redemption Price,  shall cease and terminate,  and such shares shall
no  longer  be  deemed  to be  outstanding,  whether  or  not  the  certificates
representing such shares have been received by the Company.

         (e) Any  communication  or notice relating to redemption given pursuant
to this Section 5 of this  subsection B shall be sent by  first-class  certified
mail, return receipt requested, postage prepaid, to the Preferred B1 Holders, at
their respective addresses as the same shall appear on the books of the Company,
or to the Company at the address of its principal,  or registered office, as the
case may be.

         (f) At any time on or after  the  Redemption  Date,  the  Preferred  B1
Holders shall be entitled to receive the Redemption  Price upon actual  delivery
to the Company or its agents of the certificates  representing the shares of the
Class B1 Preferred Stock to be redeemed.

         (g) Any redemption  payments by the Company  pursuant to this Section 5
of this subsection B shall be paid in cash.

         (h) Any  shares  of Class B1  Preferred  Stock  which are  redeemed  or
otherwise  acquired by the Company  shall be canceled and shall not be reissued,
sold or transferred  as Class B1 Preferred  Stock and the Board shall reduce the
number of authorized  shares of Class B1 Preferred stock by the number of shares
so redeemed or otherwise acquired.

         6.  Maturity Default.

         (a) The occurrence of any of the following  events of default shall, at
the option of the Requisite Preferred Holders, constitute a Maturity Default:

                  (i)  the Company fails to comply in any  material respect with
         any of  its  obligations under any  of the Transaction Documents or the
         Fundamental Documents;

                  (ii) a material  default occurs under any mortgage,  indenture
         or other  instrument  under which there may be secured or evidenced any
         indebtedness  for money borrowed by the Company if the principal amount
         of such indebtedness aggregates $1,000,000 or more; or

                  (iii) the  Company  fails to  comply  with the  provisions  of
         Section 7.2(g)(iv) of the Purchase Agreement.


                                       27


<PAGE>



         (b) A default under clauses (a)(i) or (a)(ii) is not a Maturity Default
until the Company does not cure the default within 30 days of the Company having
Knowledge of such default. When a default is cured, it ceases.

         (c) The Requisite  Preferred Holders by notice to the Company may waive
an existing default or Maturity Default and its consequences.  When a default or
Maturity Default is waived, it ceases.

         7.  Exchange.

         (a)  Subject  to the  requirements  of  Section  500 of the  California
Corporation Law, the Requisite Preferred B1 Holders and the Company may agree at
any  time  and from  time to time  following  the  Exchange  Triggering  Date to
exchange  all  or  any  portion  of the  shares  of  Class  B1  Preferred  Stock
outstanding  into the  Company's  Subordinated  Debentures  (the  "Notes") to be
issued  substantially in the form of Exhibit D of the Purchase  Agreement in the
amount of $1,000 principal amount of Notes for each $1,000 of Liquidation  Value
of Class B1 Preferred  Stock;  provided,  however,  that no such exchange may be
consummated unless full cumulative  dividends  (including,  without duplication,
full  cumulative  dividends  pro rata for the  elapsed  portion  of the  current
dividend  period) on the Class B1 Preferred  Stock to the date of exchange shall
have been paid.  Notes shall be issued only in integral  multiples  of $1,000 at
the time of exchange. If any additional amounts ("Fractional Principal Amounts")
would otherwise be issuable to any holders of Preferred Stock,  then the Company
shall, in lieu of issuing a Fractional  Principal Amount  therefor,  pay in full
payment of the Company's  obligation with respect to such  Fractional  Principal
Amount,  to each Preferred B1 Holder an amount in cash equal to such  Fractional
Principal  Amount.  Any and all  exchange  rights set forth in this Section 7 of
this subsection B shall be deemed to be a right of redemption subject to Section
402 of the California  Corporation Law. In the event that the Company  exercises
its  option  to  exchange  any  portion  of the  outstanding  shares of Class B1
Preferred Stock into Notes pursuant to this Section 7 of this subsection B, such
shares to be exchanged  shall be selected for exchange at the  discretion of, or
in a manner approved by, the Board.  Notwithstanding any of the other provisions
of this  Section  7 of this  subsection  B, so long as any  Preferred  B1 Holder
remains a Significant Holder, the Company shall not be permitted to exchange all
outstanding  shares of Class B1 Preferred  Stock,  but shall  instead allow such
Significant  Holder to remain the holder of one (1) share of Class B1  Preferred
Stock.

         (b) Any exchange pursuant to this Section 7 shall be made upon not less
than 30 days' notice prior to the date fixed for exchange (the "Exchange Date").
The notice  given shall state  that,  upon  surrender  of their  certificate  or
certificates  to the  Company,  the  holders  of Class B1  Preferred  Stock will
receive  Notes in the amount set forth in Section 7(a) of this  subsection B and
that, at the close of business on the Exchange  Date,  all rights of the holders
with respect to such shares so called for exchange shall cease, except the right
to receive the Notes in the amount set forth in Section 7(a) of this  subsection
B. Except as may be otherwise  required by applicable law, the form of the Notes
may only be amended or supplemented  before the first Exchange Date which occurs
with the affirmative vote or consent of the Requisite  Preferred B1 Holders.  On
or after such first Exchange Date, the Notes may only be amended or supplemented
as provided in the Notes.  The Company will cause the Notes to be  authenticated
on the Exchange Date, and the Company will pay interest on the Notes at the rate
and on the dates  specified  in the Notes from and after the  relevant  Exchange
Date.

                                       28

<PAGE>



C.  Class C1 Preferred Stock.
    ------------------------

         1. Definitions.  As used in this subsection C of this  Determination of
Preferred Stock,  capitalized  terms not otherwise defined herein shall have the
meanings  given to such  terms  in the  Purchase  Agreement.  In  addition,  the
following capitalized terms have the following meanings:

         "Articles of Incorporation"  means the Articles of Incorporation of the
Company as amended and restated and in effect at the time in question.

         "By-laws"  means the By-laws of the  Company,  as amended and in effect
from time to time.

         "Board" means the Board of Directors of the Company.

         "Class A Preferred Stock" means the Class A Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Class B Preferred Stock" means the Class B Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Class C Preferred Stock" means the Class C Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Common  Stock" means,  collectively,  all of the Common Stock,  no par
value, of the Company of any class,  and any other class of capital stock of the
Company hereafter authorized that is not limited to a fixed sum or percentage of
par or  stated  value  in  respect  to the  rights  of the  holders  thereof  to
participate in dividends or in the  distribution of assets upon any liquidation,
dissolution or winding up of the Company.

         "Dividend  Reference  Date" has the  meaning  ascribed to it in Section
C.2(c).

         "Exchange Triggering Date" means December 31, 1999.

         "Liquidation"  means, subject to the provisions of Section 3(b) of this
subsection C, any voluntary or involuntary  liquidation,  dissolution or winding
up of the affairs of the Company.

         "Liquidation  Value"  shall mean  Original  Cost plus any  accrued  and
unpaid dividends as determined pursuant to Section 2(c) of this subsection C.

         "Maturity Date" means,  with respect to any Class C1 Preferred Stock or
Notes issued in exchange for Class C1 Preferred  Stock, the earliest to occur of
(i) a Maturity Default, (ii) a Change of Control or (iii) June 30, 2005.

         "Maturity  Default" shall have the meaning set forth in Section 6(a) of
this subsection C.

                                       29

<PAGE>


         "Net Proceeds" of any transaction shall mean the gross proceeds of such
transaction net of any commissions or transaction  fees and expenses paid by the
Company in connection with such transaction.

         "Original Cost" means,  with respect to any share of Class C1 Preferred
Stock, $1,000.

         "Person"  shall  be  construed   broadly  and  shall  include   without
limitation an individual, a partnership, a corporation,  an association, a joint
stock  company,  a limited  liability  company,  a trust,  a joint  venture,  an
unincorporated organization and a Governmental Authority.

         "Preferred C1 Holders" means holders of Class C1 Preferred Stock.

         "Preferred  Shareholder Agreement" shall mean the Preferred Shareholder
Agreement, dated as of February 17, 1999, between the Company and the Holder (as
defined therein).

         "Preferred  Stock" means,  collectively,  the Class A Preferred  Stock,
Class B Preferred  Stock,  Class C Preferred  Stock,  Class A1 Preferred  Stock,
Class A2 Preferred Stock,  Class B1 Preferred  Stock,  Class C1 Preferred Stock,
Class D Preferred Stock and Voting Preferred Stock.

         "Purchase  Agreement" means the Securities  Purchase Agreement dated as
of August 7, 1998, between the Company and the Investor (as defined therein), as
amended, restated or otherwise modified from time to time.

         "Rate per Annum"  means the  specified  rate per annum  computed on the
basis of a 360-day year;  provided,  that in the event dividends are not paid in
full in cash on any  applicable  Dividend  Reference Date or upon any Redemption
Date,  the Rate per Annum for the  applicable  period  shall be increased by 500
basis points (e.g., a 9.0% Rate per Annum would be increased to a 14.0% Rate per
Annum) until such dividends are paid in full in cash.

         "Redemption  Price" has the meaning ascribed to it in Section C.5(a) of
this Determination of Preferred Stock.

         "Requisite Preferred C1 Holders" means the holders of a majority of the
then outstanding shares of Class C1 Preferred Stock.

         "Requisite Preferred Holders" means the holders representing a majority
of the then outstanding  shares of Class A1 Preferred Stock,  Class A2 Preferred
Stock,  Class B1 Preferred Stock, Class C1 Preferred Stock and Class D Preferred
Stock voting together as a group.

         "Transaction Documents" means the Purchase Agreement,  the Exhibits and
Schedules attached thereto in their final and executed form, as applicable,  and
each of the agreements contemplated thereby.

         "Voting  Preferred  Stock"  means  the  Voting  Preferred  Stock of the
Company.

         "Warrant" has the meaning given to such term in the Purchase Agreement.

                                       30

<PAGE>


         2.  Dividends.

         (a) The Preferred C1 Holders shall be entitled to receive, out of funds
legally available therefor, cumulative dividends on the Liquidation Value at the
Rate per Annum and for the periods set forth below:


                                                            Rate Per
         Period                                              Annum
         ------                                             --------
Until June 30, 2000....................................       9.0%
July 1, 2000 to June 30, 2001..........................      11.0%
July 1, 2001 to June 30, 2002..........................      12.0%
July 1, 2002 to June 30, 2003..........................      13.0%
July 1, 2003 to June 30, 2004..........................      14.0%
July 1, 2004 to June 30, 2005..........................      15.0%

(subject to appropriate  adjustments in the event of any stock  dividend,  stock
split, combination or other similar recapitalization  affecting such shares) per
share per annum, and no more,  payable in preference and priority to any payment
of any cash dividend on Common Stock or any other shares of capital stock of the
Company other than the Class A Preferred Stock, Class B Preferred Stock, Class C
Preferred Stock,  Class A1 Preferred Stock,  Class A2 Preferred Stock,  Class B1
Preferred  Stock,  Class C1 Preferred  Stock and Class D Preferred  Stock (which
shall rank on a par with the Class C1 Preferred  Stock) or other class or series
of stock  ranking on a par with,  or senior to the Class C1  Preferred  Stock in
respect  of  dividends  (such  Common  Stock  and  other  inferior  stock  being
collectively referred to as "Junior Stock"), when and as declared by the Board.

         (b) Such dividends  shall accrue with respect to each share of Class C1
Preferred  Stock from the date on which such share is issued and outstanding and
thereafter  shall be deemed to accrue  from day to day  whether or not earned or
declared and whether or not there exists profits, surplus or other funds legally
available for the payment of dividends,  and shall be cumulative so that if such
dividends on the Class C1 Preferred  Stock shall not have been paid, or declared
and set apart for payment,  the  deficiency  shall be fully paid or declared and
set apart for payment before any dividend shall be paid or declared or set apart
for any Junior Stock and before any purchase or  acquisition of any Junior Stock
is made by the Company,  except the repurchase of Junior Stock from employees of
the Company upon termination of employment,  except as otherwise approved by the
Requisite Preferred C1 Holders.

         (c) Dividends  shall be payable in cash,  quarterly in arrears.  To the
extent  dividends are not paid on each  September 30,  December 31, March 31 and
June 30, (each a "Dividend  Reference Date") all dividends which have accrued on
each share of Class C1 Preferred Stock during the three-month period (or shorter
period  in the  case  of the  first  or last  period)  ending  on each  Dividend
Reference  Date will be added to the  Liquidation  Value of such  share and will
remain a part  thereof  until  such  dividends  are  paid in full in cash.  Each
dividend  paid in cash shall be mailed to the  holders of record of the

                                       31
<PAGE>


Class C1  Preferred  Stock as their  names  and  addresses  appear  on the share
register  of  the  Company  or at  the  office  of  the  transfer  agent  on the
corresponding dividend payment date.

         3.  Liquidation.

         (a) In the event of any  Liquidation  of the Company,  the Preferred C1
Holders  shall be entitled  to be paid out of the assets of the Company  legally
available for distribution to its stockholders, after and subject to the payment
in full of all  amounts  required  to be  distributed  to the  holders of Voting
Preferred Stock and any other class or series of stock of the Company ranking on
liquidation   prior  and  in  preference   to  the  Class  C1  Preferred   Stock
(collectively  referred to as "Senior Preferred Stock"),  but before any payment
shall be made to the  holders  of  Junior  Stock by  reason  of their  ownership
thereof,  an  amount  equal  to the  Liquidation  Value  per  share  of Class C1
Preferred  Stock.  If upon any such  Liquidation  of the Company  the  remaining
assets of the Company  available for distribution to its  stockholders  shall be
insufficient  to pay the holders of shares of Class C1 Preferred  Stock the full
amount  to which  they  shall be  entitled,  the  holders  of shares of Class C1
Preferred  Stock and the holders of shares of Class A Preferred  Stock,  Class B
Preferred  Stock,  Class C Preferred Stock,  Class A1 Preferred Stock,  Class A2
Preferred Stock, Class B1 Preferred Stock, Class D Preferred Stock and any other
class or series of stock  ranking on  liquidation  on a parity with the Class C1
Preferred Stock shall share ratably in any  distribution of the remaining assets
and funds of the Company in  proportion  to the  respective  amounts which would
otherwise  be  payable  in  respect  of  the  shares  held  by  them  upon  such
distribution  if all amounts payable on or with respect to such shares were paid
in full.

         (b) The merger or  consolidation  of the Company  into or with  another
corporation  which results in the exchange of outstanding  shares of the Company
for securities or other  consideration  issued or paid or caused to be issued or
paid by such other corporation or an affiliate thereof (except if such merger or
consolidation  does not  result in the  transfer  of more than 50 percent of the
voting  securities of the Company),  or the sale of all or substantially all the
assets of the Company,  shall be deemed to be a  Liquidation  of the Company for
purposes of this Section 3 of this subsection C, unless the Requisite  Preferred
C1 Holders vote otherwise. The amount deemed distributed to the holders of Class
C1 Preferred  Stock upon any such merger or  consolidation  shall be the cash or
the value of the property,  rights and/or securities distributed to such holders
by the  acquiring  person,  firm or other  entity.  The value of such  property,
rights or other securities shall be determined in good faith by the Board.

         4.  Voting Rights.

         (a) Except as required by law and pursuant to  paragraphs  (b), (c) and
(d) below, the Preferred C1 Holders shall not be entitled to vote.

         (b) The Company shall not, without the affirmative  consent or approval
of the Requisite Preferred C1 Holders:

                  (i) in any manner authorize, issue or sell any shares of Class
         C1 Preferred Stock other than as contemplated by the Purchase Agreement
         or this Determination of Preferred Stock;

                                       32

<PAGE>


                  (ii)  reclassify,  cancel or in any manner alter or change the
         designations, privileges or relative, optional or other special rights,
         or the  qualifications,  limitations or  restrictions  thereof,  of the
         Class C1 Preferred Stock;

                  (iii) amend, repeal or modify any provision of this subsection
         C of this Determination of Preferred Stock; or

                  (iv) amend,  repeal or modify any provision of the Articles of
         Incorporation  or By-laws in a manner that would  adversely  affect the
         preferences, privileges or rights of the Preferred C1 Holders.

         (c)(i) The Company  hereby  covenants  that the Requisite  Preferred C1
         Holders  shall  have the right to have that  number of  representatives
         (each such  representative,  an  "Observer")  determined as hereinafter
         provided  present at all  meetings of the Board.  Such right shall from
         time to time be  exercisable  by  delivery  to the  Company  of written
         notice from the Requisite  Preferred C1 Holders specifying the names of
         such  Observers.  The number of  Observers  shall at all times and from
         time to time be equal to that  number of nominees to the Board that the
         Preferred C1 Holders are then entitled to designate  less the number of
         such nominees as are then members of the Board.

                  (ii) The  Company  will give each  Observer  reasonable  prior
         notice (it being  agreed that the same prior  notice given to the Board
         shall be deemed reasonable prior notice) in any manner permitted in the
         Company's By-laws for notices to directors of the time and place of any
         proposed meeting of the Board, such notice in all cases to include true
         and  complete  copies of all  documents  furnished  to any  director in
         connection with such meeting. Each such Observer will be entitled to be
         present in person as an observer  at any such  meeting or, if a meeting
         is held by telephone conference, to participate therein for the purpose
         of listening thereto.

                  (iii) The Company will deliver to each Observer  copies of all
         papers which may be  distributed  from time to time to the directors of
         the  Company at such time as such  papers are so  distributed  to them,
         including copies of any written consent.

         (d) The Company shall not, without the affirmative  consent or approval
of the Requisite Preferred Holders:

                  (i) take any action,  or enter into or authorize  any material
         agreement or material transaction, other than in the ordinary course of
         business and consistent with past practice;

                  (ii)  agree to acquire  the stock or assets  of, or  otherwise
         agree to any  joint  venture,  licensing  arrangement  with,  any other
         person.

                  (iii) enter into any  arrangement  which would  reasonably  be
         expected to result in a Change of Control;

                                       33
<PAGE>


                  (iv) sell,  transfer,  convey,  assign or otherwise dispose of
         any of its material  assets or  properties,  or spinoff or splitoff any
         material assets, properties or Securities except sales of inventory and
         used,  obsolete,  worn out or unnecessary  equipment or fixtures in the
         ordinary course of business and consistent with past practice;

                  (v) sell,  transfer,  convey,  assign,  license  or  otherwise
         dispose of any significant portion of its Intellectual Property Rights;

                  (vi) except in the ordinary  course of business and consistent
         with past  practice,  waive,  release  or cancel  any  material  claims
         against  third  parties or material  debts owing to it, or any material
         rights which have any material value;

                  (vii) make any  material  changes in its  accounting  systems,
         policies,  principles  or practices  except in the  ordinary  course of
         business and consistent with past practice;

                  (viii) enter into,  authorize,  or permit any transaction with
         Affiliates,   or  modify  in  any  material   respect  the  employment,
         compensation or other  arrangements with the executive  officers of the
         Company or any Subsidiary;

                  (ix) authorize for issuance,  issue, sell, deliver or agree or
         commit to issue,  sell or deliver  (whether  through  the  issuance  or
         granting of options, warrants or exchangeable Securities,  commitments,
         subscriptions,  rights to purchase or otherwise)  any shares of capital
         stock or any other  Securities  of the  Company or any  Subsidiary,  or
         amend any of the terms of any such capital stock or other Securities;

                  (x) split,  combine,  or reclassify  any shares of its capital
         stock,  declare, set aside or pay any dividend (other than dividends on
         the Preferred Stock) or other  distribution  (whether in cash, stock or
         property or any  combination  thereof) in respect of its capital stock,
         or redeem or otherwise acquire any capital stock or other Securities of
         the Company or any Subsidiary;

                  (xi) except in the ordinary  course of business and consistent
         with past practice,  make any borrowings,  incur any  Indebtedness,  or
         assume,   guarantee,   endorse  or  otherwise  become  liable  (whether
         directly,  contingently  or otherwise) for the obligations of any other
         Person;

                  (xii) except in the ordinary course of business and consistent
         with past practice,  make any loans,  advances or capital contributions
         to, or investments in, any other Person.

         5.  Redemption.

         (a) Subject to the Company  having  funds  legally  available  for such
purpose,  the Company,  on the Maturity  Date shall have the option of redeeming
all the shares of outstanding  Class C1 Preferred Stock for cash as described in
Section  5(d) - (h) below.  If the  Company  does not redeem  such shares on the
Maturity  Date,  the Company  shall pay full  cumulative  dividends  (including,
without duplication,  full cumulative dividends pro rata for the elapsed portion
of the current  dividend period) on the Class C1

                                       34
<PAGE>


Preferred Stock to the Maturity Date and, immediately thereafter,  each share of
Class C1 Preferred  Stock shall  automatically  be  converted  into one share of
Class D Preferred Stock. The per share redemption price at which shares of Class
C1  Preferred  Stock are to be redeemed  pursuant to this  Section  5(a) of this
subsection C1 shall be equal to the Liquidation Value (the "Redemption Price").

         (b) In the event the Company or any of its  Subsidiaries  consummates a
public or private offering for cash of capital stock or other equity  interests,
the Company  shall be required to apply 50% of the Net Proceeds of such offering
toward the redemption of shares of Preferred Stock (other than Voting  Preferred
Stock),  on a pro rata basis (determined on the basis of the number of shares of
Preferred Stock (other than Voting  Preferred  Stock),  held by such holder over
the total  number of shares of  Preferred  Stock  (other than  Voting  Preferred
Stock) outstanding) from the Holders of Preferred Stock at the Redemption Price.

         (c) In addition to the Company's  obligations  as set forth in Sections
5(a) and (b), of this  subsection C, the Company shall have the option to redeem
a  minimum  of $1  million  of  Original  Cost of Class C1  Preferred  Stock and
integral multiples of $100,000 thereafter at the Liquidation Value thereof.  Any
shares to be redeemed  pursuant to this Section 5(c) of this  subsection C shall
be selected for redemption at the discretion of, or in a manner approved by, the
Board.  Notwithstanding  any of the other  provisions  of this Section 5 of this
subsection C, so long as any Preferred C1 Holder  remains a Significant  Holder,
the Company shall not be permitted to redeem or retire all outstanding shares of
Class C1 Preferred  Stock,  but shall instead allow such  Significant  Holder to
remain the holder of one (1) share of Class C1 Preferred Stock.

         (d) On and after any date set for redemption  (the  "Redemption  Date")
pursuant to this Section 5 of this subsection C (unless default shall be made by
the Company in the payment of the Redemption  Price,  in which event such rights
shall be exercisable until such default is cured),  all rights in respect of the
shares of the  Class C1  Preferred  Stock to be  redeemed,  except  the right to
receive the Redemption Price,  shall cease and terminate,  and such shares shall
no  longer  be  deemed  to be  outstanding,  whether  or  not  the  certificates
representing such shares have been received by the Company.

         (e) Any  communication  or notice relating to redemption given pursuant
to this Section 5 of this  subsection C shall be sent by  first-class  certified
mail, return receipt requested, postage prepaid, to the Preferred C1 Holders, at
their respective addresses as the same shall appear on the books of the Company,
or to the Company at the address of its principal,  or registered office, as the
case may be.

         (f) At any time on or after  the  Redemption  Date,  the  Preferred  C1
Holders shall be entitled to receive the Redemption  Price upon actual  delivery
to the Company or its agents of the certificates  representing the shares of the
Class C1 Preferred Stock to be redeemed.

         (g) Any redemption  payments by the Company  pursuant to this Section 5
of this subsection C shall be paid in cash.

                                       35

<PAGE>


         (h) Any  shares  of Class C1  Preferred  Stock  which are  redeemed  or
otherwise  acquired by the Company  shall be canceled and shall not be reissued,
sold or transferred  as Class C1 Preferred  Stock and the Board shall reduce the
number of authorized  shares of Class C1 Preferred Stock by the number of shares
so redeemed or otherwise acquired.

         6.  Maturity Default.

         (a) The occurrence of any of the following  events of default shall, at
the option of the Requisite Preferred Holders, constitute a Maturity Default:

                  (i) the Company  fails to  comply in any material respect with
         any of its  obligations under  any of  the Transaction Documents or the
         Fundamental Documents;

                  (ii) a material  default occurs under any mortgage,  indenture
         or other  instrument  under which there may be secured or evidenced any
         indebtedness  for money borrowed by the Company if the principal amount
         of such indebtedness aggregates $1,000,000 or more; or

                  (iii) the  Company  fails to  comply  with the  provisions  of
         Section 7.2(g)(iv) of the Purchase Agreement.

         (b) A default under clauses (a)(i) or (a)(ii) is not a Maturity Default
until the Company does not cure the default within 30 days of the Company having
Knowledge of such default. When a default is cured, it ceases.

         (c) The Requisite  Preferred Holders by notice to the Company may waive
an existing default or Maturity Default and its consequences.  When a default or
Maturity Default is waived, it ceases.

         7.  Exchange.

         (a) Subject to the provisions of Section 500 of California  Corporation
Law,  the  Requisite  Preferred C1 Holders and the Company may agree at any time
and from time to time following the Exchange  Triggering Date to exchange all or
any  portion  of the shares of Class C1  Preferred  Stock  outstanding  into the
Company's  Subordinated  Debentures (the "Notes") to be issued  substantially in
the form  attached  to the  Purchase  Agreement  as  Exhibit D, in the amount of
$1,000 principal  amount of Notes for each $1,000 of Liquidation  Value of Class
C1 Preferred Stock; provided,  however, that no such exchange may be consummated
unless  full  cumulative  dividends   (including,   without  duplication,   full
cumulative  dividends pro rata for the elapsed  portion of the current  dividend
period) on the Class C1 Preferred  Stock to the date of exchange shall have been
paid. Notes shall be issued only in integral  multiples of $1,000 at the time of
exchange.  If any additional  amounts  ("Fractional  Principal  Amounts")  would
otherwise be issuable to any holders of Preferred Stock, then the Company shall,
in lieu of issuing a Fractional  Principal Amount therefor,  pay in full payment
of the Company's obligation with respect to such Fractional Principal Amount, to
each  Preferred  C1 Holder an amount in cash equal to the  Fractional  Principal
Amount.  Any and all  exchange  rights  set  forth  in  this  Section  7 of this
subsection C shall be deemed to be a right of redemption  subject to Section 402
of the California

                                       36

<PAGE>


Corporation Law. In the event that the Company  exercises its option to exchange
any portion of the  outstanding  shares of Class C1  Preferred  Stock into Notes
pursuant to this  Section 7 of this  subsection  C, such shares to be  exchanged
shall be selected for exchange at the discretion of, or in a manner approved by,
the Board. Notwithstanding any of the other provisions of this Section 7 of this
subsection C, so long as any Preferred C1 Holder  remains a Significant  Holder,
the Company shall not be permitted to exchange all  outstanding  shares of Class
C1 Preferred Stock,  but shall instead allow such  Significant  Holder to remain
the holder of one (1) share of Class C1 Preferred Stock.

         (b) Any exchange pursuant to this Section 7 shall be made upon not less
than 30 days' notice prior to the date fixed for exchange (the "Exchange Date").
The notice  given shall state  that,  upon  surrender  of their  certificate  or
certificates  to the  Company,  the  holders  of Class C1  Preferred  Stock will
receive Notes in the amount set forth in Section 7(a) of this subsection C above
and that,  at the close of  business  on the  Exchange  Date,  all rights of the
holders with respect to such shares so called for exchange  shall cease,  except
the right to receive  the Notes in the amount set forth in Section  7(a) of this
subsection C. Except as may be otherwise required by applicable law, the form of
the Notes may only be amended or  supplemented  before the first  Exchange  Date
which occurs with the affirmative vote or consent of the Requisite  Preferred C1
Holders.  On or after such first Exchange Date, the Notes may only be amended or
supplemented  as provided in the Notes.  The Company  will cause the Notes to be
authenticated  on the  Exchange  Date,  and the Company will pay interest on the
Notes at the rate and on the dates  specified  in the  Notes  from and after the
relevant Exchange Date.


D.  Class D Preferred Stock.
    -----------------------

         1. Definitions.  As used in this subsection D of this  Determination of
Preferred Stock,  capitalized  terms not otherwise defined herein shall have the
meanings  given to such  terms  in the  Purchase  Agreement.  In  addition,  the
following capitalized terms have the following meanings:

         "Articles of Incorporation"  means the Articles of Incorporation of the
Company as amended and restated and in effect at the time in question.

         "By-laws"  means the By-laws of the  Company,  as amended and in effect
from time to time.

         "Board" means the Board of Directors of the Company.

         "Class A Preferred Stock" means the Class A Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Class B Preferred Stock" means the Class B Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

         "Class C Preferred Stock" means the Class C Cumulative,  Redeemable and
Exchangeable Preferred Stock of the Company.

                                       37
<PAGE>


         "Common  Stock" means,  collectively,  all of the Common Stock,  no par
value, of the Company of any class,  and any other class of capital stock of the
Company hereafter authorized that is not limited to a fixed sum or percentage of
par or  stated  value  in  respect  to the  rights  of the  holders  thereof  to
participate in dividends or in the  distribution of assets upon any liquidation,
dissolution or winding up of the Company.

         "Dividend  Reference  Date" has the  meaning  ascribed to it in Section
D.2(c).

         "Exchange Triggering Date" means December 31, 1999.

         "Liquidation"  means, subject to the provisions of Section 3(b) of this
subsection D, any voluntary or involuntary  liquidation,  dissolution or winding
up of the affairs of the Company.

         "Liquidation  Value"  shall mean  Original  Cost plus any  accrued  and
unpaid dividends as determined pursuant to Section 2(c) of this subsection D.

         "Maturity  Date" means,  with respect to any Class D Preferred Stock or
Notes issued in exchange for Class D Preferred  Stock,  the earliest to occur of
(i) a Maturity  Default,  (ii) a Change of  Control or (iii) June 30,  2005 (the
"Calendar Maturity Date").

         "Maturity  Default" shall have the meaning set forth in Section 6(a) of
this subsection D.

         "Net Proceeds" of any transaction shall mean the gross proceeds of such
transaction net of any commissions or transaction  fees and expenses paid by the
Company in connection with such transaction.

         "Original  Cost" means,  with respect to any share of Class D Preferred
Stock, $1,000.

         "Person"  shall  be  construed   broadly  and  shall  include   without
limitation an individual, a partnership, a corporation,  an association, a joint
stock  company,  a limited  liability  company,  a trust,  a joint  venture,  an
unincorporated organization and a Governmental Authority.

         "Preferred D Holders" means holders of Class D Preferred Stock.

         "Preferred  Stock" means,  collectively,  the Class A Preferred  Stock,
Class B Preferred  Stock,  Class C Preferred  Stock,  Class A1 Preferred  Stock,
Class A2 Preferred Stock,  Class B1 Preferred  Stock,  Class C1 Preferred Stock,
Class D Preferred Stock and Voting Preferred Stock.

         "Purchase Agreement" means the Securities Purchase Agreement,  dated as
of August 7, 1998, between the Company and the Investor (as defined therein), as
amended, restated or otherwise modified from time to time.

         "Rate per Annum"  means the  specified  rate per annum  computed on the
basis of a 360-day year;  provided,  that in the event dividends are not paid in
full in cash on any applicable  Dividend  Reference Date, the Rate per Annum for
the applicable period shall be increased by 500 basis points (e.g., a 40.0% Rate
per Annum would be increased to a 45% Rate per Annum) until such  dividends  are
paid in full in cash.

                                       38

<PAGE>


         "Redemption  Price" has the meaning ascribed to it in Section D.5(b) of
this Determination of Preferred Stock.

         "Requisite  Preferred  D  Holders"  means the  holders  representing  a
majority of the then outstanding shares of Class D Preferred Stock.

         "Requisite Preferred Holders" means the holders representing a majority
of the then outstanding  shares of Class A1 Preferred Stock,  Class A2 Preferred
Stock,  Class B1 Preferred Stock, Class C1 Preferred Stock and Class D Preferred
Stock voting together as a group.

         "Transaction Documents" means the Purchase Agreement,  the Exhibits and
Schedules attached thereto in their final and executed form, as applicable,  and
each of the agreements contemplated thereby.

         "Voting  Preferred  Stock"  means  the  Voting  Preferred  Stock of the
Company.

         "Warrant" has the meaning given to such term in the Purchase Agreement.


         2.  Dividends.

         (a) The Preferred D Holders shall be entitled to receive,  out of funds
legally available therefor, cumulative dividends on the Liquidation Value at the
Rate per Annum of 40.0% (subject to appropriate  adjustments in the event of any
stock  dividend,  stock split,  combination  or other  similar  recapitalization
affecting such shares) per share per annum,  and no more,  payable in preference
and  priority to any payment of any cash  dividend on Common  Stock or any other
shares of capital stock of the Company  other than the Class A Preferred  Stock,
Class B Preferred Stock, Class C Preferred Stock, Class D Preferred Stock, Class
A1 Preferred Stock, Class A2 Preferred Stock, Class B1 Preferred Stock and Class
C1 Preferred Stock (which shall rank on a par with the Class D Preferred  Stock)
or other class or series of stock  ranking on a par with, or senior to the Class
D Preferred  Stock in respect of dividends (such Common Stock and other inferior
stock being collectively referred to as "Junior Stock"), when and as declared by
the Board.

         (b) Such  dividends  shall accrue with respect to each share of Class D
Preferred  Stock from the date on which such share is issued and outstanding and
thereafter  shall be deemed to accrue  from day to day  whether or not earned or
declared and whether or not there exists profits, surplus or other funds legally
available for the payment of dividends,  and shall be cumulative so that if such
dividends on the Class D Preferred  Stock shall not have been paid,  or declared
and set apart for payment,  the  deficiency  shall be fully paid or declared and
set apart for payment before any dividend shall be paid or declared or set apart
for any Junior Stock and before any purchase or  acquisition of any Junior Stock
is made by the Company,  except the repurchase of Junior Stock from employees of
the Company upon  termination  of  employment  or as  otherwise  approved by the
Requisite Preferred D Holders.


                                       39

<PAGE>


         (c) Dividends  shall be payable in cash,  quarterly in arrears.  To the
extent  dividends are not paid on each  September 30,  December 31, March 31 and
June 30, (each a "Dividend  Reference Date") all dividends which have accrued on
each share of Class D Preferred Stock during the three-month  period (or shorter
period  in the  case  of the  first  or last  period)  ending  on each  Dividend
Reference  Date will be added to the  Liquidation  Value of such  share and will
remain a part  thereof  until  such  dividends  are  paid in full in cash.  Each
dividend  paid in cash  shall be mailed to the  holders of record of the Class D
Preferred Stock as their names and addresses appear on the share register of the
Company or at the office of the  transfer  agent on the  corresponding  dividend
payment date.


         3.  Liquidation.

         (a) In the event of any  Liquidation  of the Company,  the  Preferred D
Holders  shall be entitled  to be paid out of the assets of the Company  legally
available for distribution to its stockholders, after and subject to the payment
in full of all  amounts  required  to be  distributed  to the  holders of Voting
Preferred Stock and any other class or series of stock of the Company ranking on
liquidation prior and in preference to the Class D Preferred Stock (collectively
referred to as "Senior Preferred  Stock"),  but before any payment shall be made
to the holders of Junior Stock by reason of their ownership  thereof,  an amount
equal to the Liquidation Value per share of Class D Preferred Stock. If upon any
such  Liquidation of the Company the remaining  assets of the Company  available
for distribution to its stockholders shall be insufficient to pay the holders of
shares  of Class D  Preferred  Stock  the full  amount  to which  they  shall be
entitled,  the holders of shares of Class D  Preferred  Stock and the holders of
shares of Class A Preferred Stock,  Class B Preferred  Stock,  Class C Preferred
Stock,  Class A1 Preferred Stock,  Class A2 Preferred Stock,  Class B1 Preferred
Stock,  Class C1 Preferred  Stock and any other class or series of stock ranking
on liquidation on a parity with the Class D Preferred  Stock shall share ratably
in any  distribution  of the  remaining  assets  and  funds  of the  Company  in
proportion to the respective amounts which would otherwise be payable in respect
of the shares held by them upon such  distribution  if all amounts payable on or
with respect to such shares were paid in full.

         (b) The merger or  consolidation  of the Company  into or with  another
corporation  which results in the exchange of outstanding  shares of the Company
for securities or other  consideration  issued or paid or caused to be issued or
paid by such other corporation or an affiliate thereof (except if such merger or
consolidation  does not  result in the  transfer  of more than 50 percent of the
voting  securities of the Company),  or the sale of all or substantially all the
assets of the Company,  shall be deemed to be a  Liquidation  of the Company for
purposes of this Section 3 of this subsection D, unless the Requisite  Preferred
D Holders vote otherwise.  The amount deemed distributed to the holders of Class
D Preferred Stock upon any such merger or consolidation shall be the cash or the
value of the property,  rights and/or securities  distributed to such holders by
the acquiring person,  firm or other entity. The value of such property,  rights
or other securities shall be determined in good faith by the Board.


                                       40

<PAGE>


         4.  Voting Rights.

         (a) Except as required by law and pursuant to  paragraphs  (b), (c) and
(d) below, the Preferred D Holders shall not be entitled to vote.

         (b) The Company shall not, without the affirmative  consent or approval
of the Requisite Preferred D Holders:

                  (i) in any manner authorize, issue or sell any shares of Class
         D Preferred Stock other than as contemplated by the Purchase  Agreement
         or this Determination of Preferred Stock;

                  (ii)  reclassify,  cancel or in any manner alter or change the
         designations,  preferences,  privileges or relative,  optional or other
         special  rights,  or the  qualifications,  limitations or  restrictions
         thereof, of the Class D Preferred Stock;

                  (iii) amend, repeal or modify any provision of this subsection
         D of this Determination of Preferred Stock; or

                  (iv) amend,  repeal or modify any provision of the Articles of
         Incorporation  or By-laws in a manner that would  adversely  affect the
         preferences, privileges or rights of the Preferred D Holders.

         (c)(i) The Company  hereby  covenants  that the  Requisite  Preferred D
         Holders  shall  have the right to have that  number of  representatives
         (each such  representative,  an  "Observer")  determined as hereinafter
         provided  present at all  meetings of the Board.  Such right shall from
         time to time be  exercisable  by  delivery  to the  Company  of written
         notice from the Requisite  Preferred D Holders  specifying the names of
         such  Observers.  The number of  Observers  shall at all times and from
         time to time be equal to that  number of nominees to the Board that the
         Preferred D Holders are then  entitled to designate  less the number of
         such nominees as are then members of the Board.

                  (ii) The  Company  will give each  Observer  reasonable  prior
         notice (it being  agreed that the same prior  notice given to the Board
         shall be deemed reasonable prior notice) in any manner permitted in the
         Company's By-laws for notices to directors of the time and place of any
         proposed meeting of the Board, such notice in all cases to include true
         and  complete  copies of all  documents  furnished  to any  director in
         connection with such meeting. Each such Observer will be entitled to be
         present in person as an observer  at any such  meeting or, if a meeting
         is held by telephone conference, to participate therein for the purpose
         of listening thereto.

                  (iii) The Company will deliver to each Observer  copies of all
         papers which may be  distributed  from time to time to the directors of
         the  Company at such time as such  papers are so  distributed  to them,
         including copies of any written consent.

                                       41

<PAGE>


         (d) The Company shall not, without the affirmative  consent or approval
of the Requisite Preferred Holders:

                  (i) take any action,  or enter into or authorize  any material
         agreement or material transaction, other than in the ordinary course of
         business and consistent with past practice;

                  (ii)  agree to acquire  the stock or assets  of, or  otherwise
         agree to any  joint  venture,  licensing  arrangement  with,  any other
         person.

                  (iii) enter into any  arrangement  which would  reasonably  be
         expected to result in a Change of Control;

                  (iv) sell,  transfer,  convey,  assign or otherwise dispose of
         any of its material  assets or  properties,  or spinoff or splitoff any
         material assets, properties or Securities except sales of inventory and
         used,  obsolete,  worn out or unnecessary  equipment or fixtures in the
         ordinary course of business and consistent with past practice;

                  (v) sell,  transfer,  convey,  assign,  license  or  otherwise
         dispose of any significant portion of its Intellectual Property Rights;

                  (vi) except in the ordinary  course of business and consistent
         with past  practice,  waive,  release  or cancel  any  material  claims
         against  third  parties or material  debts owing to it, or any material
         rights which have any material value;

                  (vii) make any  material  changes in its  accounting  systems,
         policies,  principles  or practices  except in the  ordinary  course of
         business and consistent with past practice;

                  (viii) enter into,  authorize,  or permit any transaction with
         Affiliates,   or  modify  in  any  material   respect  the  employment,
         compensation or other  arrangements with the executive  officers of the
         Company or any Subsidiary;

                  (ix) authorize for issuance,  issue, sell, deliver or agree or
         commit to issue,  sell or deliver  (whether  through  the  issuance  or
         granting of options, warrants or exchangeable Securities,  commitments,
         subscriptions,  rights to purchase or otherwise)  any shares of capital
         stock or any other  Securities  of the  Company or any  Subsidiary,  or
         amend any of the terms of any such capital stock or other Securities;

                  (x) split,  combine,  or reclassify  any shares of its capital
         stock,  declare, set aside or pay any dividend (other than dividends on
         the Preferred Stock) or other  distribution  (whether in cash, stock or
         property or any  combination  thereof) in respect of its capital stock,
         or redeem or otherwise acquire any capital stock or other Securities of
         the Company or any Subsidiary;

                                       42


<PAGE>


                  (xi) except in the ordinary  course of business and consistent
         with past practice,  make any borrowings,  incur any  Indebtedness,  or
         assume,   guarantee,   endorse  or  otherwise  become  liable  (whether
         directly,  contingently  or otherwise) for the obligations of any other
         Person;

                  (xii) except in the ordinary course of business and consistent
         with past practice,  make any loans,  advances or capital contributions
         to, or investments in, any other Person.


         5.  Redemption.

         (a) [Intentionally Deleted.]

         (b) In the event the Company or any of its  Subsidiaries  consummates a
public or private offering for cash of capital stock or other equity  interests,
the Company  shall be required to apply 50% of the Net Proceeds of such offering
toward the redemption of shares of Preferred Stock (other than Voting  Preferred
Stock),  on a pro rata basis (determined on the basis of the number of shares of
Preferred Stock (other than Voting  Preferred  Stock),  held by such holder over
the total  number of shares of  Preferred  Stock  (other than  Voting  Preferred
Stock) outstanding) from the Holders of Preferred Stock at the Redemption Price.
The per share redemption price at which shares of Class D Preferred Stock are to
be redeemed pursuant to this Section 5(b) of this subsection D shall be equal to
the Liquidation Value (the "Redemption Price").

         (c) In addition to the Company's  mandatory  redemption  obligations as
set forth in  Section  5(b) of this  subsection  D, the  Company  shall have the
option to redeem a minimum of $1 million of  Original  Cost of Class D Preferred
Stock and integral  multiples of $100,000  thereafter at the  Liquidation  Value
thereof.  Any  shares  to be  redeemed  pursuant  to this  Section  5(c) of this
subsection  D shall be selected for  redemption  at the  discretion  of, or in a
manner approved by, the Board.  Notwithstanding  any of the other  provisions of
this Section 5 of this subsection D, so long as any Preferred D Holder remains a
Significant  Holder,  the Company shall not be permitted to redeem or retire all
outstanding  shares of Class D Preferred  Stock,  but shall  instead  allow such
Significant  Holder to remain the  holder of one (1) share of Class D  Preferred
Stock.

         (d) On and after any date set for redemption  (the  "Redemption  Date")
pursuant to this Section 5 of this subsection D (unless default shall be made by
the Company in the payment of the Redemption  Price,  in which event such rights
shall be exercisable until such default is cured),  all rights in respect of the
shares  of the  Class D  Preferred  Stock to be  redeemed,  except  the right to
receive the Redemption Price,  shall cease and terminate,  and such shares shall
no  longer  be  deemed  to be  outstanding,  whether  or  not  the  certificates
representing such shares have been received by the Company.

         (e) Any  communication  or notice relating to redemption given pursuant
to this Section 5 of this  subsection D shall be sent by  first-class  certified
mail, return receipt requested,  postage prepaid, to the Preferred D Holders, at
their respective addresses as the same shall appear on the books of the Company,
or to the Company at the address of its principal,  or registered office, as the
case may be.


                                       43

<PAGE>


         (f) At any  time on or after  the  Redemption  Date,  the  Preferred  D
Holders shall be entitled to receive the Redemption  Price upon actual  delivery
to the Company or its agents of the certificates  representing the shares of the
Class D Preferred Stock to be redeemed.

         (g) Any redemption  payments by the Company  pursuant to this Section 5
of this subsection D shall be paid in cash.

         (h) Any  shares  of Class D  Preferred  Stock  which  are  redeemed  or
otherwise  acquired by the Company  shall be canceled and shall not be reissued,
sold or  transferred  as Class D Preferred  Stock and the Board shall reduce the
number of authorized  shares of Class D Preferred  Stock by the number of shares
so redeemed or otherwise acquired.


         6.  Maturity Default.

         (a) The occurrence of any of the following  events of default shall, at
the option of the Requisite Preferred Holders, constitute a Maturity Default:

                  (i) the Company  fails to comply in any  material respect with
         any  of its obligations  under any of the  Transaction Documents or the
         Fundamental Documents;

                  (ii) a material  default occurs under any mortgage,  indenture
         or other  instrument  under which there may be secured or evidenced any
         indebtedness  for money borrowed by the Company if the principal amount
         of such indebtedness aggregates $1,000,000 or more; or

                  (iii) the  Company  fails to  comply  with the  provisions  of
         Section 7.2(g)(iv) of the Purchase Agreement.

         (b) A default under clauses (a)(i) or (a)(ii) is not a Maturity Default
until the Company does not cure the default within 30 days of the Company having
Knowledge of such default. When a default is cured, it ceases.

         (c) The Requisite  Preferred Holders by notice to the Company may waive
an existing default or Maturity Default and its consequences.  When a default or
Maturity Default is waived, it ceases.


         7.  Exchange.

         (a)  Subject  to the  requirements  of  Section  500 of the  California
Corporation Law, the Requisite  Preferred D Holders and the Company may agree at
any  time  and from  time to time  following  the  Exchange  Triggering  Date to
exchange all or any portion of the shares of Class D Preferred Stock outstanding
into  the  Company's   Subordinated   Debentures  (the  "Notes")  to  be  issued
substantially in the form attached as Exhibit D to the Purchase Agreement in the
amount of $1,000 principal amount of Notes for each $1,000 of Liquidation  Value
of Class D Preferred  Stock;  provided,  however,  that no such  exchange may be
consummated unless full cumulative  dividends  (including,  without duplication,
full  cumulative  dividends  pro rata for the  elapsed  portion  of the  current
dividend period) on the Class D

                                       44
<PAGE>


Preferred  Stock to the date of  exchange  shall have been paid.  Notes shall be
issued  only in integral  multiples  of $1,000 at the time of  exchange.  If any
additional amounts ("Fractional  Principal Amounts") would otherwise be issuable
to any holders of Preferred Stock,  then the Company shall, in lieu of issuing a
Fractional  Principal  Amount  therefor,  pay in full  payment of the  Company's
obligation with respect to such Fractional  Principal Amounts, to each Preferred
D Holder an amount in cash equal to such Fractional  Principal  Amount.  Any and
all exchange  rights set forth in this  Section 7 of this  subsection D shall be
deemed to be a right of  redemption  subject  to Section  402 of the  California
Corporation Law. In the event that the Company  exercises its option to exchange
any  portion of the  outstanding  shares of Class D  Preferred  Stock into Notes
pursuant to this  Section 7 of this  subsection  D, such shares to be  exchanged
shall be selected for exchange at the discretion of, or in a manner approved by,
the Board. Notwithstanding any of the other provisions of this Section 7 of this
subsection  D, so long as any Preferred D Holder  remains a Significant  Holder,
the Company shall not be permitted to exchange all outstanding shares of Class D
Preferred Stock,  but shall instead allow such Significant  Holder to remain the
holder of one (1) share of Class D Preferred Stock.

         (b) Any exchange pursuant to this Section 7 shall be made upon not less
than 30 days' notice prior to the date fixed for exchange (the "Exchange Date").
The notice  given shall state  that,  upon  surrender  of their  certificate  or
certificates to the Company, the holders of Class D Preferred Stock will receive
Notes in the  amount set forth in Section  7(a) of this  subsection  D above and
that, at the close of business on the Exchange  Date,  all rights of the holders
with respect to such shares so called for exchange shall cease, except the right
to receive the Notes in the amount set forth in Section 7(a) of this  subsection
D. Except as may be otherwise  required by applicable law, the form of the Notes
may only be amended or supplemented  before the first Exchange Date which occurs
with the affirmative vote or consent of the Requisite Preferred D Holders. On or
after such first Exchange Date, the Notes may only be amended or supplemented as
provided in the Notes.  The Company will cause the Notes to be  authenticated on
the  Exchange  Date,  and the Company will pay interest on the Notes at the rate
and on the dates specified in Notes from and after the relevant Exchange Date.



                                            /s/ Douglas J. Tullio
                                            --------------------------------
                                            Douglas J. Tullio
                                            President



                                            /s/ Jeffrey J. Dunnigan
                                            --------------------------------
                                            Jeffrey J. Dunnigan
                                            Secretary


                                       45
<PAGE>


         We further declare under penalty of perjury under the laws of the State
of  California  that the  matters  set  forth in this  Certificate  are true and
correct of our own knowledge. Executed at Santa Ana, California, on February __,
1999.


                                            /s/ Douglas J. Tullio
                                            --------------------------------
                                            Douglas J. Tullio
                                            President



                                            /s/ Jeffrey J. Dunnigan
                                            --------------------------------
                                            Jeffrey J. Dunnigan
                                            Secretary



                                       46



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