PROTOSOURCE

                                       AND

                      ANDREW ALEXANDER WISE & COMPANY, INC.

                                  UNDERWRITER'S
                                WARRANT AGREEMENT






     Underwriter's WARRANT AGREEMENT dated as of _________________by and between
ProtoSource  (the  "Company")  and Andrew  Alexander  Wise & Company,  Inc. (the
"Underwriter").

                              Preliminary Statement
                              ---------------------

     The  Underwriter  has agreed,  pursuant to an  underwriting  agreement (the
"Underwriting   Agreement")  dated   ____________________,   1997,  between  the
Underwriter  and the Company,  to act as the  Underwriter in connection with the
Company's  proposed  initial public  offering of 900,000 shares of the Company's
common  stock,  par value  $0.001 per share (the  "Common  Stock")  and  900,000
Redeemable Common Stock Purchase Warrants (the "Warrants"), at an initial public
offering  price of $_______ per share of Common Stock and $____ per Warrant (the
"Initial Public Offering").  The Company proposes to issue to the Underwriter at
the  closing  of the  Initial  Public  Offering  as  part  of the  Underwriter's
compensation in connection therewith, warrants (the "Underwriter's Warrants") to
purchase an aggregate of 90,000 shares of Common Stock and/or  90,000  Warrants.
The  Warrants  being  offered in the Initial  Public  Offering  and the Warrants
purchasable upon exercise of the Underwriter's Warrants will be identical in all
respects and will be issued  pursuant to, and governed by, the  provisions  of a
Warrant  Agreement  among the  Company,  the  Underwriter  and  Corporate  Stock
Transfer Co., as Warrant Agent (the "Warrant  Agreement").  NOW,  THEREFORE,  in
consideration of the premises,  the payment by the Underwriter to the Company of
Ten  Dollars  ($10.00),  the  agreements  herein  set forth  and other  good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, the parties hereto agree as follows:






     1. Grant.  The  Holders (as defined in Section 3 below) are hereby  granted
the right to purchase,  at any time from  ______________,  1998 until 5:00 p.m.,
New York City time,  on  _____________,  2003 an aggregate  of 90,000  shares of
Common Stock and/or 90,000  Warrants,  at an initial  purchase price of $_______
per share of Common  Stock  (subject  to  adjustment  as  provided  in Section 6
hereof) and $_____ per Warrant (120% of the Initial Public Offering price of the
Common Stock and Warrants, respectively), subject to the terms and conditions of
this Agreement.

     2.  Warrant  Certificates.  The warrant  certificates  (the  "Underwriter's
Warrant  Certificates")  to be delivered  pursuant to this Agreement shall be in
the form set forth in Exhibit A attached  hereto  and made a part  hereof,  with
such appropriate  insertions,  omissions,  substitutions and other variations as
required or permitted by this Agreement.

     3.  Exercise of  Underwriter's  Warrants.  The  Underwriter's  Warrants are
exercisable during the term set forth in Section 1 hereof and the Purchase Price
(as  hereinafter  defined) is payable by certified  or cashier's  check or money
order  payable  in lawful  money of the  United  States.  Upon  surrender  of an
Underwriter's  Warrant Certificate with the annexed Form of Election to Purchase
duly  executed,  together  with payment of the Purchase  Price for the shares of
Common Stock or Warrants issuable upon exercise thereof (and such other amounts,
if any, arising pursuant to Section 4 hereof) at the Company's  principal office
in New York  (presently  located  at 2300  Tulare  Street,  Suite  210,  Fresno,
California 93721), the registered holder of an Underwriter's Warrant Certificate
("Holders"  or  "Holders")  shall  be  entitled  to  receive  a  certificate  or
certificates  for the  shares of Common  Stock or  Warrants  so  purchased.  The
purchase  rights  represented  by each  Underwriter's  Warrant  Certificate  are
exercisable at the option of the Holders thereof, in whole or in part, as to the

                                        2





whole number of shares of Common Stock or Warrants  purchasable  therewith  (but
not as to fractions  thereof).  In the case of the purchase of less than all the
shares  of  Common  Stock  or  Warrants  purchasable  upon the  exercise  of the
Underwriter's Warrants represented by an Underwriter's Warrant Certificate,  the
Company shall cancel the Underwriter's  Warrant Certificate  represented thereby
upon the  surrender  thereof and shall  execute and deliver a new  Underwriter's
Warrant Certificate of like tenor for the number of Underwriter's Warrants which
have not been exercised.

     4.  Issuance  of  Certificates.  Upon  the  exercise  of the  Underwriter's
Warrants  and  payment  of  the  Purchase  Price   therefor,   the  issuance  of
certificates  representing the shares of Common Stock or Warrants  issuable upon
exercise  thereof,  shall be made  forthwith  (and in any event  within five (5)
business days thereafter) without further charge to the Holder thereof, and such
certificates  shall  (subject to the  provisions  of Sections 5 and 7 hereof) be
issued  in the name of,  or in such  names as may be  directed  by,  the  Holder
thereof;  provided,  however,  that the Company shall not be required to pay any
tax which may be payable in respect of any transfer involved in the issuance and
delivery of any such  certificates in a name other than that of the Holder,  and
the Company shall not be required to issue or deliver such  certificates  unless
or until the person or persons  requesting the issuance  thereof shall have paid
to the  Company  the  amount  of  such  tax or  shall  have  established  to the
satisfaction  of the  Company  that such tax has been  paid.  The  Underwriter's
Warrant  Certificates  and the  certificates  representing  the shares of Common
Stock or  Warrants  (and such  other  securities,  property  or rights as may be
represented by certificates) issuable upon exercise thereof shall be executed on
behalf of the Company by the manual or facsimile  signature of the then Chairman
or Vice Chairman of the  Board of Directors, Chief  Executive Officer, President

                                        3





or Vice  President of the Company under its corporate seal  reproduced  thereon,
attested  to by the  manual or  facsimile  signature  of the then  Secretary  or
Assistant  Secretary  or  Treasurer  or  Assistant  Treasurer  of  the  Company.
Underwriter's  Warrant  Certificates shall be dated the date of issuance thereof
by the  Company  upon  initial  issuance,  transfer or  exchange,  or in lieu of
mutilated, lost, stolen or destroyed Underwriter's Warrant Certificates.

     5.  Restriction  On Transfer of  Underwriter's  Warrants.  The Holder of an
Underwriter's  Warrant  Certificate (and its Permitted  Transferees,  as defined
below), by its acceptance  thereof,  covenants and agrees that the Underwriter's
Warrants  are  being  acquired  as an  investment  and  not  with a view  to the
distribution thereof; that the Underwriter's Warrants may be sold,  transferred,
assigned,  hypothecated  or otherwise  disposed of, in whole or in part,  to any
person  (a  "Permitted   Transferee"),   provided  such  transfer,   assignment,
hypothecation or other  disposition is made in accordance with the provisions of
the Securities Act of 1933, as amended (the "Act"); and provided,  further, that
until  ____________,  1999 [one year following the effective date of the Initial
Public Offering] only officers and partners of the  Underwriter,  or any selling
group member in the Initial Public  Offering and their  respective  officers and
partners, shall be Permitted Transferees.

     6. Purchase Price. The initial purchase price of the Underwriter's Warrants
shall be $_____ per share of Common Stock (the "Common  Stock  Purchase  Price")
and $_____ per  Warrant.  The Common  Stock  Purchase  Price shall be subject to
adjustment  in  accordance  with the  provisions  of  Section  9 of the  Warrant
Agreement, which provisions are hereby incorporated by reference herein and made
a part hereof.

                                        4





     7. Registration Rights.

     (a)  Registration  Under  the  Securities  Act of 1933.  The  Underwriter's
Warrants  have not been  registered  under the Act.  The  Underwriter's  Warrant
Certificates shall bear the following legend:

          The securities represented by this certificate have not been
          registered under the Securities Act of 1933 (the "Act"), and
          may not be offered for sale or sold  except  pursuant to (i)
          an effective  registration  statement under the Act, or (ii)
          an opinion of counsel,  if such opinion  shall be reasonably
          satisfactory  to counsel to the  issuer,  that an  exemption
          from registration under such Act is available.

     (b)  Demand  Registration.  (i) At any  time  commencing  one (1)  year and
expiring seven (7) years after the effective date of the Company's  Registration
Statement  relating to the Initial Public Offering (the "Effective  Date"),  the
Holders of a majority  (as  hereinafter  defined) of the shares of Common  Stock
purchased and purchasable  upon exercise of the  Underwriter's  Warrants and the
Warrants  purchasable  therewith  shall have the right,  exercisable  by written
notice to the Company,  to have the Company prepare and file with the Securities
and  Exchange  Commission  (the  "Commission"),  solely on one (1)  occasion,  a
registration  statement on Form SB-2 (or other appropriate form), and such other
documents,  including a  prospectus,  as may be necessary in the opinion of both
counsel for the Company and counsel for the Holders, in order to comply with the
provisions of the Securities Act, so as to permit a public offering and sale for
a period of nine (9) months of the shares of Common Stock and Warrants purchased
or  purchasable  by such  Holders  and any other  Holders  of the  Underwriter's
Warrants  upon  exercise  of  the   Underwriter's   Warrants  and  the  Warrants
purchasable  therewith  (  such  shares  of  Common  Stock  and  Warrants  being


                                        5




hereinafter  referred to as the  "Registrable  Securities").  The Holders of the
Underwriter's   Warrants  may  demand   registration   without   exercising  the
Underwriter's  Warrants,  and are never  required to exercise  same. The Company
covenants and agrees to give written  notice of any  registration  request under
this Section 7(b) to all other registered Holders of the Underwriter's  Warrants
and the Registrable Securities within ten (10) days from the date of the receipt
of any such  registration  request  and upon the  written  request of any Holder
within  fifteen  (15) days  after  receipt  of such  notice to  include  in such
registration  statement,  the  Registrable  Securities  of such Holder.  As used
herein,  the term  "Majority"  in reference to the Holders of the  Underwriter's
Warrants  shall  mean in excess of fifty  percent  (50%) of the shares of Common
Stock issued or issuable  upon  exercise of the  Underwriter's  Warrants and the
Warrants  purchasable  therewith  that  (i) are  not  held  by the  Company,  an
affiliate,  officer,  creditor,  employee  or  agent  thereof  or any  of  their
respective affiliates, members of their family, persons acting as nominees or in
conjunction therewith,  or (ii) have not been resold to the public pursuant to a
registration statement filed with the Commission under the Act.

     (c) Piggyback  Registration.  If, at any time within the period  commencing
one (1) year and expiring five (5) years after the Effective  Date,  the Company
should file a registration  statement  with the Commission  under the Securities
Act  (other  than in  connection  with a merger  or other  business  combination
transaction  or pursuant to Form S-8) it will give written  notice by registered
mail,  at least  thirty  (30)  calendar  days  prior to the  filing of each such
registration  statement,  to the  Underwriter  and to all other  Holders  of the
Underwriter's  Warrants and the shares of Common Stock and Warrants purchased or
purchasable  upon exercise  thereof of its intention to do so. If the Holders of
the Registrable  Securities  notify the Company within twenty (20) calendar days
after  receipt  of any  such  notice  of its or  their  desire  to  include  any
Registrable Securities in such proposed

                                        6





registration statement,  the Company shall afford the Holders of the Registrable
Securities the opportunity to have such Registrable  Securities included in such
registration statement,  unless the Underwriter for each proposed objects to the
inclusion of the Registrable Securities in such registration statement. However,
in such event,  the Company  will,  within six (6) months of  completion of such
underwritten  offering,  file at the  expense  of the  Company,  a  registration
statement  so as to  permit  a  public  offering  and  sale  of the  Registrable
Securities  so  excluded  for a period  of nine (9)  months,  which  shall be in
addition to any registration  statement required to be filed pursuant to Section
7(b).  Notwithstanding the provisions of this Section 7(c) and the provisions of
Section  7(d),  the Company shall have the right at any time after it shall have
given written notice  pursuant to this Section 7(c)  (irrespective  of whether a
written  request for inclusion of any such  securities  shall have been made) to
elect not to file any such proposed registration  statement,  or to withdraw the
same after the filing but prior to the effective date thereof.

     (d)  Covenants of the Company With Respect to  Registration.  In connection
with  any  registrations  under  Sections  7(b)  and 7(c)  hereof,  the  Company
covenants and agrees as follows:

          (1) The  Company  shall use its best  efforts  to file a  registration
statement within forty-five (45) calendar days of receipt of any demand therefor
pursuant to section  7(b);  provided,  however,  that the  Company  shall not be
required to produce  audited or unaudited  financial  statements  for any period
prior to the date such financial statements are required to be filed in a report
on Form 10-KSB or Form  10-QSB,  as the case may be. The  Company  shall use its
best  efforts  to have any  registration  statement  declared  effective  at the
earliest  possible  time,  and  shall  furnish  each  Holder  desiring  to  sell
Registrable  Securities  such  number of  prospectuses  as shall  reasonably  be
requested.

                                        7





          (2) The Company  shall pay all costs  (excluding  fees and expenses of
Holders'  counsel and any  underwriting  discounts or selling fees,  expenses or
commissions),  fees and expenses in connection with any  registration  statement
filed pursuant to Sections 7(b) and 7(c) hereof including,  without  limitation,
the Company's legal and accounting fees,  printing  expenses,  blue sky fees and
expenses.  If the Company  shall fail to comply with the  provisions  of Section
7(d),  the Company  shall,  in addition to any other  equitable  or other relief
available  to the  Holders,  be liable  for any or all  incidental  and  special
damages and damages due to loss of profit  sustained  by the Holders  requesting
registration of their Registrable Securities.

          (3) The Company will take all  necessary  action which may be required
to qualify or register the  Registrable  Securities  included in a  registration
statement  for offering and sale under the  securities  or blue sky laws of such
states as  reasonably  are  requested by the Holders,  provided that the Company
shall not be  obligated  to  execute or file any  general  consent to service of
process or to qualify as a foreign  corporation to do business under the laws of
any such jurisdiction.

          (4)  The  Company  shall  indemnify  the  Holders  of the  Registrable
Securities to be sold pursuant to any registration statement and each person, if
any,  who  controls  such  Holders  within  the  meaning  of  Section  15 of the
Securities  Act or Section  20(a) of the  Securities  Exchange  Act of 1934,  as
amended  (the  "Exchange  Act"),  against all loss,  claim,  damage,  expense or
liability   (including  all  expenses   reasonably  incurred  in  investigating,
preparing or defending  against any claim  whatsoever)  to which any of them may
become subject under the Securities Act, the Exchange Act or otherwise,  arising
from such registration statement,  but only to the same extent and with the same
effect as the  provisions  pursuant to which the Company has agreed to indemnify
the Underwriter  contained in Section 8 of the Underwriting  Agreement,  and the
Holders shall  indemnify the Company to the same extent and with the same effect


                                        8




as the provisions pursuant to which the Underwriter have agreed to indemnify the
Company contained in Section 8 of the Underwriting Agreement.

          (5) The Holders of the Registrable Securities to be sold pursuant to a
registration  statement,  and their successors and assigns,  shall indemnify the
Company,  its officers and directors  and each person,  if any, who controls the
Company  within the meaning of Section 15 of the Securities Act or Section 20(a)
of the Exchange Act, against all loss, claim,  damage or expense or liability to
which they may become  subject  under the  Securities  Act,  the Exchange Act or
otherwise,  arising from information  furnished by or on behalf of such Holders,
or their  successors  or assigns,  for specific  inclusion in such  registration
statement  to the  same  extent  and  with the  same  effect  as the  provisions
contained  in  Section 8 of the  Underwriting  Agreement  pursuant  to which the
Underwriter have agreed to indemnify the Company.

          (6)  Nothing  contained  in  this  Agreement  shall  be  construed  as
requiring the Holders to exercise their Underwriter's  Warrants (or the Warrants
purchasable  upon  exercise   thereof)  prior  to  the  initial  filing  of  any
registration statement or the effectiveness thereof.

          (7) The Company shall not be entitled to include any securities  other
than the Registrable  Securities in any registration statement filed pursuant to
Section  7(b)  hereof  without  the prior  written  consent of the  Holders of a
Majority of the Registrable Securities.

          (8) The  Company  shall  furnish to a  designated  Underwriter  of the
Holders participating in the offering and to each Underwriter,  if any, a signed
counterpart,  addressed  to such  Holder or  Underwriter  of (i) an  opinion  of
counsel to the Company,  dated the effective date of such registration statement
(and if such registration relates to an underwritten public offering, an opinion
dated the date of the  closing  under the  underwriting  agreement),  and (ii) a
"cold comfort"  letter dated the effective date of such  registration  statement


                                        9





(and, if such registration  relates to an underwritten public offering, a letter
dated the date of the closing under the  underwriting  agreement)  signed by the
independent  public  accountants  who  have  issued a  report  on the  Company's
financial   statements   included   in   such   registration    statement   (the
"Accountants"),  in each  case  covering  substantially  the same  matters  with
respect to such  registration  statement (and the prospectus  included  therein)
and, in the case of the  accountants'  "cold  comfort"  letter,  with respect to
events subsequent to the date of such financial  statements,  as are customarily
covered in opinions of issuer's  counsel  and in "cold  comfort"  letters,  with
respect to events  subsequent to the date of such financial  statements,  as are
customarily  covered in  opinions  of  issuer's  counsel  and in "cold  comfort"
letters delivered to Underwriter in underwritten public offerings of securities.

          (9) The Company shall as soon as practicable  after the effective date
of the registration statement make "generally available to its security holders"
(within the meaning of Rule 158 under the Act) an earnings statement (which need
not be audited)  complying with Section ll(a) of the Securities Act and covering
a period of at least 12 consecutive months beginning after the effective date of
the registration statement.


          (10) The Company shall deliver  promptly to each Holder  participating
in the offering  requesting the correspondence  described below and any managing
Underwriter copies of all correspondence between the Commission and the Company,
its counsel or Accountants with respect to the registration statement and permit
each Holder and Underwriter to do such  investigation,  upon reasonable  advance
notice,   with  respect  to  information   contained  in  or  omitted  from  the
registration   statement  as  it  deems  reasonably  necessary  to  comply  with
applicable  securities  laws or rules of the National  Association of Securities
Dealers,  Inc.  ("NASD").  Such  investigation  shall  include  access to books,



                                       10




records and properties and  opportunities to discuss the business of the Company
with its officers and  Underwriters of the  Accountants,  all to such reasonable
extent  and at such  reasonable  times  and as often as any  such  Holder  shall
reasonably request.


          (11) The Company shall enter into an  underwriting  agreement with the
managing  Underwriter  selected  for such  underwriting  by  Holders  holding  a
Majority  of  the  Registrable  Securities  requested  to be  included  in  such
underwriting;  provided,  however,  that (i) such managing  Underwriter shall be
reasonably acceptable to the Company, except that in connection with an offering
for which the Holders have  piggyback  rights,  the Company  shall have the sole
right  to  select  the  managing  Underwriter,  and (ii)  the  Holders  shall be
responsible  for any  selling  fees  or  commissions  in  connection  with  such
underwriting.  Such  underwriting  agreement  shall be  satisfactory in form and
substance  to the  Company,  a  Majority  of  such  Holders  and  such  managing
Underwriter, and shall contain such representations, warranties and covenants by
the Company and such other terms as are  customarily  contained in agreements of
that type used by the managing Underwriter.  The Holders shall be parties to any
underwriting  agreement  relating to an underwritten  sale of their  Registrable
Securities   and  may,   at  their   option,   require   that  any  or  all  the
representations,  warranties  and covenants of the Company to or for the benefit
of such  Underwriter  shall also be made to and for the benefit of such Holders.
Such Holders shall not be required to make any  representations or warranties to
or agreements with the Company or the  Underwriter  except as they may relate to
such Holders and their intended methods of distribution.

     (e) Further  Registrations.  The Company will cooperate with the Holders of
the Registrable Securities in preparing and signing any registration  statement,
in addition to the registration statements discussed above, required in order to
sell or transfer the Underwriter's Securities  and will  supply  all information

                                       11





required  therefor,  but such  additional  registration  statement  expenses  or
offering statement expenses will be prorated between the Company and the Holders
of the  Registrable  Securities  according to the  aggregate  sales price of the
securities being issued.  The provisions of Section 7(d) shall apply to any such
registration statement.

          8.   Exchange   and   Replacement   of  Warrant   Certificates.   Each
Underwriter's  Warrant  Certificate is exchangeable  without  expense,  upon the
surrender thereof by the registered Holders at the principal executive office of
the Company, for a new Underwriter's  Warrant Certificate of like tenor and date
representing in the aggregate the right to purchase the same number of shares of
Common Stock and/or Warrants in such denominations as shall be designated by the
Holders  thereof at the time of such  surrender.  Upon receipt by the Company of
evidence  reasonably  satisfactory  to it of the  loss,  theft,  destruction  or
mutilation of any Underwriter's Warrant Certificate, and, in case of loss, theft
or  destruction,  of indemnity or security  reasonably  satisfactory  to it, and
reimbursement to the Company of all reasonable expenses incidental thereto,  and
upon surrender and cancellation of the Underwriter's  Warrant  Certificates,  if
mutilated,  the  Company  will  make and  deliver  a new  Underwriter's  Warrant
Certificate of like tenor, in lieu thereof.

          9.  Elimination  of  Fractional  Interests.  The Company  shall not be
required to issue certificates  representing fractions of shares of Common Stock
upon the  exercise of the  Underwriter's  Warrants,  nor shall it be required to
issue scrip or pay cash in lieu of fractional interests; provided, however, that
if a Holder exercises all Underwriter's  Warrants held of record by such Holder,
the fractional  interests shall be eliminated by rounding any fraction up to the
nearest whole number of shares of Common Stock.

                                       12





          10.  Reservation  and Listing of Securities.  The Company shall at all
times reserve and keep available out of its  authorized  shares of Common Stock,
solely for the  purpose  of  issuance  upon the  exercise  of the  Underwriter's
Warrants, such number of shares of Common Stock or other securities,  properties
or rights as shall be issuable upon the exercise thereof.  The Company covenants
and agrees  that,  upon  exercise of  Underwriter's  Warrants and payment of the
Purchase  Price  therefor,  all the shares of Common Stock and other  securities
issuable  upon such  exercise  shall be duly and  validly  issued,  fully  paid,
non-assessable and not subject to the preemptive rights of any stockholder.  The
Company further covenants and agrees that as long as the Underwriter's  Warrants
shall be outstanding, the Company shall use its best efforts to cause the Common
Stock and Warrants to be listed  (subject to official notice of issuance) on all
securities  exchanges on which the Common  Stock and the Warrants  issued in the
Initial Public Offering may then be listed or quoted.

          11. Notices to  Underwriter's  Warrant Holders.  Nothing  contained in
this  Agreement  shall be construed as conferring  upon the Holders the right to
vote or to  consent  or to  receive  notice as a  stockholder  in respect of any
meetings of stockholders  for the election of directors or any other matter,  or
as having any rights whatsoever as a stockholder of the Company. If, however, at
any  time  prior to the  expiration  of the  Underwriter's  Warrants  and  their
exercise, any of the following events shall occur:

     (a) the Company  shall take a record of the holders of its shares of Common
Stock for the purpose of  entitling  them to receive a dividend or  distribution
payable  otherwise  than in cash,  or a cash  dividend or  distribution  payable
otherwise  than  out of  current  or  retained  earnings,  as  indicated  by the
accounting  treatment  of such  dividend  or  distribution  on the  books of the
Company; or

                                       13





     (b) the  Company  shall  offer to all the  holders of its Common  Stock any
additional shares of capital stock of the Company or securities convertible into
or exchangeable for shares of capital stock of the Company, or any option, right
or warrant to subscribe therefor; or

     (c) a dissolution,  liquidation or winding up of the Company (other than in
connection with a consolidation or merger) or a sale of all or substantially all
of its property,  assets and business as an entirety shall be proposed; then, in
any one or more of said events,  the Company  shall give written  notice of such
event at least fifteen (15) days prior to the date fixed as a record date or the
date of closing the transfer  books for the  determination  of the  stockholders
entitled to such dividend, distribution,  convertible or exchangeable securities
or  subscription  rights,  or  entitled  to vote on such  proposed  dissolution,
liquidation,  winding up or sale.  Such notice shall specify such record date or
the date of closing the transfer books, as the case may be. Failure to give such
notice or any defect  therein  shall not affect the validity of any action taken
in  connection  with the  declaration  or payment of any such  dividend,  or the
issuance of any convertible or exchangeable securities,  or subscription rights,
options or warrants,  or any proposed  dissolution,  liquidation,  winding up or
sale.

     12.  Notices.  All notices,  requests,  consents  and other  communications
hereunder  shall be in  writing  and shall be deemed to have been duly made when
delivered,  or mailed by registered or certified mail, return receipt requested:


          (a) If to the registered Holders of the Underwriter's Warrants, to the
address of such Holders as shown on the books of the Company; or

          (b) If to the  Company to the address set forth in Section 3 hereof or
to such other address as the Company may designate by notice to the Holders.

                                       14




     13.  Supplements and  Amendments.  The Company and the Underwriter may from
time to time  supplement  or amend this  Agreement  without the  approval of any
Holders of Underwriter's  Warrant  Certificates  (other than the Underwriter) in
order to cure any ambiguity,  to correct or supplement  any provision  contained
herein which may be defective or inconsistent with any provisions  herein, or to
make any other  provisions in regard to matters or questions  arising  hereunder
which the Company and the  Underwriter may deem necessary or desirable and which
the Company and the Underwriter deem shall not adversely affect the interests of
the Holders of Underwriter's Warrant Certificates.

     14. Successors. All the covenants and provisions of this Agreement shall be
binding  upon and inure to the  benefit of the  Company,  the  Underwriter,  the
Holders and their respective successors and assigns hereunder.

     15. Termination. This Agreement shall terminate at the close of business on
__________________,  2005.  Notwithstanding  the foregoing,  the indemnification
provisions  of  Section  7 shall  survive  such  termination  until the close of
business on the expiration of any applicable statute of limitations.

     16.  Governing  Law:  Submission to  Jurisdiction.  This Agreement and each
Underwriter's  Warrant  Certificate  issued  hereunder  shall be  deemed to be a
contract made under the laws of the State of New York and for all purposes shall
be construed in accordance  with the laws of said state without giving effect to
the rules of said state  governing  the  conflicts  of laws.  The  Company,  the
Underwriter  and the Holders  hereby agree that any action,  proceeding or claim
against it arising out of, or relating  in any way to, this  Agreement  shall be
brought  and  enforced  in the  courts of the State of New York or of the United
States of America for the Southern District of New York, and irrevocably submits


                                       15





to such jurisdiction,  which jurisdiction shall be exclusive.  The Company,  the
Underwriter  and the Holders  hereby  irrevocably  waive any  objection  to such
exclusive  jurisdiction or inconvenient forum. Any such process or summons to be
served upon any of the Company,  the  Underwriter and the Holders (at the option
of the  party  bringing  such  action,  proceeding  or  claim)  may be served by
transmitting  a copy thereof,  by registered or certified  mail,  return receipt
requested,  postage prepaid, addressed to it at the address set forth in Section
12 hereof.  Such mailing shall be deemed personal service and shall be legal and
binding upon the party so served in any action, proceeding or claim.

     17.  Entire  Agreement;   Modification.   This  Agreement   (including  the
Underwriting  Agreement,  to the extent portions thereof are referred to herein)
contains the entire understanding between the parties hereto with respect to the
subject matter hereof and thereof. Subject to Section 13, this Agreement may not
be  modified or amended  except by a writing  duly signed by the Company and the
Holders of a Majority of the Registrable Securities.

     18.  Severability.  If any provision of this Agreement  shall be held to be
invalid or unenforceable,  such invalidity or unenforceability  shall not affect
any other provision of this Agreement.

     19.  Captions.  The caption  headings of the Sections of this Agreement are
for  convenience  of  reference  only and are not  intended,  nor should they be
construed as, a part of this Agreement and shall be given no substantive effect.

     20.  Benefits  of this  Agreement.  Nothing  in  this  Agreement  shall  be
construed  to give to any person or  corporation  other than the Company and the
Underwriter  and any  other  registered  Holders  of the  Underwriter's  Warrant
Certificates or Registrable  Securities any legal or equitable right,  remedy or


                                       16




claim  under  this  Agreement,  and  this  Agreement  shall  be for the sole and
exclusive  benefit of the Company and the  Underwriter  and any other Holders of
the Underwriter's Warrant Certificates or Registrable Securities.

     21.  Counterparts.  This  Agreement  may  be  executed  in  any  number  of
counterparts and each of such  counterparts  shall for all purposes be deemed to
be an original,  and such counterparts shall together constitute but one and the
same instrument.

     22. Binding  Effect.  This Agreement shall be binding upon and inure to the
benefit of the Company,  the  Underwriter  and their  respective  successors and
assigns  and  the  Holders  from  time  to  time  of the  Underwriters'  Warrant
Certificates.

     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
duly executed, as of the day and year first above written. 


PROTOSOURCE


                                            By:
                                                -------------------------------
                                                 Raymond J. Meyers,
                                                 Chief Executive Officer


                                            ANDREW ALEXANDER WISE & CO.

                                            By:
                                                -------------------------------
                                                 Name:   Andreas Zigouras
                                                 Title:  President

                                       17



                                    EXHIBIT A
                                    ---------


                                   PROTOSOURCE
                                   -----------

                               WARRANT CERTIFICATE



THE  SECURITIES  ISSUABLE  UPON  EXERCISE OF THE  WARRANTS  REPRESENTED  BY THIS
CERTIFICATE  MAY NOT BE  OFFERED OR SOLD  EXCEPT  PURSUANT  TO (i) AN  EFFECTIVE
REGISTRATION  STATEMENT  UNDER THE  SECURITIES  ACT OF 1933,  (ii) TO THE EXTENT
APPLICABLE, RULE 144 UNDER SUCH ACT (OR ANY SIMILAR RULE UNDER SUCH ACT RELATING
TO THE  DISPOSITION  OF  SECURITIES),  OR (iii) AN OPINION OF  COUNSEL,  IF SUCH
OPINION  SHALL BE  REASONABLY  SATISFACTORY  TO COUNSEL FOR THE ISSUER,  THAT AN
EXEMPTION FROM REGISTRATION UNDER SUCH ACT IS AVAILABLE.

THE TRANSFER OR EXCHANGE OF THE WARRANT REPRESENTED BY THIS
CERTIFICATE IS RESTRICTED IN ACCORDANCE WITH THE WARRANT AGREEMENT
REFERRED TO HEREIN.

             EXERCISABLE COMMENCING __________________, 1999 THROUGH
              5:00 P.M., NEW YORK CITY TIME ON _____________, 2003

                            No. UW-1 90,000 Warrants

     This Warrant  Certificate  certifies that Andrew  Alexander Wise & Company,
Inc., or registered  assigns,  is the  registered  holder of 90,000  Warrants to
purchase initially, at any time from  __________________,  1998 until 5:00 p.m.,
New York City time on  __________________  (the "Expiration Date"), 90,000 fully
paid and  non-assessable  shares of Common  Stock,  $.001 par value (the "Common
Stock"), of ProtoSource,  a California corporation (the "Company") at a purchase
price of $_____ per share (the "Common  Stock  Purchase  Price"),  and/or 90,000
Redeemable  Common Stock Purchase  Warrants  ("Warrants")  of the Company at the
purchase price of $_____ per Warrant (the "Warrant  Purchase  Price"),  upon the
surrender of this Warrant  Certificate  and payment of the  applicable  Purchase
Price at an office or agency of the Company,  but subject to the  conditions set
forth herein and in the warrant agreement dated as of  _____________,  1997 (the
"Warrant  Agreement")  between the Company and Andrew  Alexander Wise & Company,
Inc. (the "Underwriter"). Payment of the applicable Purchase Price shall be made
by  certified  or  cashier's  check or money  order  payable to the order of the
Company.

     No Warrant may be  exercised  after 5:00 p.m.,  New York City time,  on the
Expiration Date, at which time all Warrants  evidenced hereby,  unless exercised
prior thereto, shall thereafter be void.

                                       A-1





     The  Warrants  evidenced  by this  Warrant  Certificate  are part of a duly
authorized  issue of Warrants issued pursuant to the Warrant  Agreement  between
the Company and the Underwriter,  which Warrant Agreement is hereby incorporated
by reference in and made a part of this instrument and is hereby referred to for
a  description  of the rights,  limitation  of rights,  obligations,  duties and
immunities  thereunder  of the Company and the holders  (the words  "holders" or
"holder" meaning the registered holders or registered holder) of the Warrants.

     The Warrant  Agreement  provides that upon the occurrence of certain events
the  respective  Purchase  Prices and the type  and/or  number of the  Company's
securities  issuable upon the exercise of this Warrant,  may, subject to certain
conditions,  be adjusted. In such event, the Company will, at the request of the
holder,  issue  a new  Warrant  Certificate  evidencing  the  adjustment  in the
Purchase  Price and the  number  and/or  type of  securities  issuable  upon the
exercise of the Warrants;  provided, however, that the failure of the Company to
issue such new  Warrant  Certificates  shall not in any way  change,  alter,  or
otherwise  impair,  the  rights  of the  holder  as  set  forth  in the  Warrant
Agreement.

     Upon  due  presentment  for   registration  of  transfer  of  this  Warrant
Certificate at an office or agency of the Company, a new Warrant  Certificate or
Warrant Certificates of like tenor and evidencing in the aggregate a like number
of Warrants shall be issued to the transferee(s) in exchange as provided herein,
without any charge except for any tax or other  governmental  charge  imposed in
connection with such transfer.

     Upon the  exercise  of less  than  all of the  Warrants  evidenced  by this
Certificate,  the  Company  shall  forthwith  issue to the  holder  hereof a new
Warrant Certificate representing such number of unexercised Warrants.

     The  Company  may deem and treat  the  registered  holder(s)  hereof as the
absolute owner(s) of this Warrant Certificate  (notwithstanding  any notation of
ownership  or other  writing  hereon  made by  anyone),  for the  purpose of any
exercise hereof,  and of any distribution to the holder(s)  hereof,  and for all
other  purposes,  and the  Company  shall not be  affected  by any notice to the
contrary.

     All terms used in this Warrant Certificate which are defined in the Warrant
Agreement shall have the meanings assigned to them in the Warrant Agreement.

     IN WITNESS WHEREOF, the undersigned has executed this certificate this ____
day of __________________, 1997.

                                          PROTOSOURCE

                                          By:
                                              ----------------------------------
                                               Raymond J. Meyers
                                               Chief Executive Officer

ATTEST

By:
   ---------------------------
            Secretary

                                       A-2





                               FORM OF ASSIGNMENT

             (To be executed by the registered holder if such holder
                  desires to transfer the Warrant Certificate.)

     FOR VALUE RECEIVED hereby sells, assigns and transfers unto

                  (Please print name and address of transferee)



this Warrant  Certificate,  together with all right, title and interest therein,
and does hereby irrevocably  constitute and appoint his or its  attorney-in-fact
to transfer the within  Warrant  Certificate on the books of  ProtoSource,  with
full power of substitution.

Dated:

                                                Signature
                                                          ----------------------

                                                (Signature  must  conform in all
                                                respects  to the name of  holder
                                                as  specified on the face of the
                                                Warrant Certificate.)


                                                --------------------------------
                                                (Insert Social Security or Other
                                                 Identifying Number of Holder)






                          FORM OF ELECTION TO PURCHASE

The undersigned  hereby  irrevocably elects to exercise the right represented by
this Warrant Certificate to purchase:

                   ___________shares of Common Stock

                   ___________Redeemable Common Stock Warrants

and  herewith  tenders in payment for such  securities  a certified or cashier's
check or money order  payable to the order of  ProtoSource  in the amount of $ ,
all  in  accordance  with  the  terms  hereof.  The  undersigned  requests  that
certificates  for such  securities be registered in the name of whose address is
and that such certificates be delivered to
                                                                whose address is
- --------------------------------------------------------.


Dated:


                                    Signature
                                               ---------------------------------
                                                (Signature  must  conform in all
                                                respects  to the name of  holder
                                                as  specified on the face of the
                                                Warrant Certificate.)



                                                --------------------------------
                                                (Insert Social Security or Other
                                                Identifying Number of Holder)