LOCK-UP AGREEMENT
                               -----------------

     LOCK-UP AGREEMENT (the "Agreement" or "Lock-Up  Agreement") dated September
30, 1996 by and between  _______________ , an officer of ProtoSource Corporation
with a place of  business  at 2580  West  Shaw  Road,  Fresno  California  93711
("Holder"),  and  Andrew,  Alexander,  Wise & Co. with a place of business at 17
State Street, New York, NY 10004 ("AAWC").

                              W I T N E S S E T H:

     WHEREAS,  Holder is the holder  of______  shares of the  restricted  Common
Stock (the "Shares") of ProtoSource Corporation ( the "Company");

     WHEREAS, AAWC is the holder warrants to purchase up to 2,200,000 Shares;

     WHEREAS,  Holder,  AAWC and the  Kriegsman  Group have  agreed not to sell,
transfer or otherwise  dispose of the Shares  except during the time periods set
forth in accordance with the terms of this Agreement;

     NOW, THEREFORE, in consideration of the foregoing and the terms, conditions
and mutual  covenants  appearing in this Agreement and the Release,  the parties
hereto hereby agree as follows:

     Section 1.

     (A)  Holder  hereby  agrees  that it will  not  offer,  sell,  transfer  or
otherwise  dispose of the Shares without the prior written consent of AAWC for a
period of three (3) years following the date hereof (the "Term").

     (B) Holder hereby  agrees that for a period of two (2) years  following the
Term of this  three  (3)  year  Lock-Up  Agreement,  any and all  sales or other
disposition of the Shares subject to this Lock-Up  Agreement will be effectuated
by or at the direction of AAWC as the selling  broker unless  another  broker is
designated in writing by AAWC.

     (C) Holder  acknowledges  that its breach or impending  violation of any of
the provisions of this Agreement may cause irreparable  damage to AAWC for which
remedies  at law  would  be  inadequate.  Holder  further  acknowledge  that the
provisions  set forth herein are essential  terms and conditions of the Release.
Holder  therefore agrees that AAWC shall be entitled to a decree or order by any
court of competent  jurisdiction enjoining such impending or actual violation of
any of such provisions.  Such decree or order, to the extent appropriate,  shall



specifically  enforce the full performance of any such provision by Holder,  and
Holder  and  AAWC  hereby  consent  to the  jurisdiction  of any  such  court of
competent jurisdiction,  state or federal, sitting in the State of New York, and
authorizes the entry on its behalf of any required  appearance for such purpose.
This remedy shall be in addition to all other remedies  available to AAWC at law
or equity.  If any  portion of this  Section 1 is  adjudicated  to be invalid or
unenforceable,  this Section 1 shall be deemed  amended to delete  therefrom the
portion  so  adjudicated,  such  deletion  to apply  only  with  respect  to the
operation of this Section 1 in the  jurisdiction  in which such  adjudication is
made.

     Section 2. Subject to Section 5 hereunder,  this  Agreement  shall inure to
the  benefit  of and be  binding  upon AAWC and  Holder,  their  successors  and
assigns.

     Section 3. Should any part of this Agreement, for any reason whatsoever, be
declared invalid,  illegal,  or incapable of being enforced in whole or in part,
such  decision  shall not affect the validity of any  remaining  portion,  which
remaining portion shall remain in full force and effect as if this Agreement had
been  executed with the invalid  portion  thereof  eliminated,  and it is hereby
declared the  intention of the parties  hereto that they would have executed the
remaining  portion of this Agreement without including therein any portion which
may for any reason be declared invalid.

     Section 4. This  Agreement  shall be construed  and enforced in  accordance
with the laws of the State of New York  applicable to agreements  made and to be
performed in such State without  application  of the  principles of conflicts of
laws of such States.

     Section 5. This  Agreement  and all rights  hereunder  are  personal to the
parties and shall not be assignable  and any  purported  assignment in violation
thereof shall be null and void.

     Section 6. Any notice,  statement,  report,  request or demand  required or
permitted  to be  given by this  Agreement  shall be in  writing,  and  shall be
sufficient  if delivered in person or if addressed  and sent by certified  mail,
return receipt requested,  postage prepaid;  or by overnight courier services or
by facsimile transmission, followed promptly by first class mail, to the parties
at the addresses  set forth above,  or at such other place that either party may
designate by notice in the foregoing  manner to the other. Any such notice shall
be deemed given five (5) days after being mailed by  certified  mail,  three (3)
days after being sent by  facsimile  transmission  followed  by being  mailed by
first class mail, one (1) day after being sent by overnight courier service with
morning delivery and immediately when personally delivered.

     Section  7.  The  failure  of  either  party  to  insist  upon  the  strict
performance  of any of the terms,  conditions  and  provisions of this Agreement
shall not be  construed  as a waiver  or  relinquishment  of  future  compliance

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therewith,  and said terms, conditions and provisions shall remain in full force
and effect. No waiver of any term or any condition of this Agreement on the part
of either party shall be effective for any purpose whatsoever unless such waiver
is in writing and signed by such party.

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

                                         ANDREW, ALEXANDER, WISE & CO.

                                         By:
                                            -----------------------------------
                                             Andreas Zigouras


                                         By:
                                            -----------------------------------


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