Exhibit 10.20

                             BRIDGE LOAN AGREEMENT

ProtoSource Corporation (the "Company")
2300 Tulare Street, Ste 210
Fresno, California 93721

To:  Raymond Meyers, Chief Executive Officer

The undersigned (the "Lender") hereby promises to lend, as provided herein,  the
amount  specified in Item 2 below in the Company.  ProtoSource  Corporation (the
"Borrower")  shall execute a series of notes in connection with the extension of
credit made by various Lenders in the aggregate  principal amount up to $750,000
(the "Credit").  In  consideration  of the extension of the Credit,  each Lender
shall  receive  shares of the Common  stock in  proportion  to the amount of the
Credit which is extended by such  Creditor;  the  aggregate  number of shares of
Common Stock of the Borrower shall be up to 150,000 shares.

1. ACKNOWLEDGEMENT OF RECEIPT

     Lender hereby  acknowledges  receipt of a copy of the Company's  Prospectus
dated May 14, 1997,  the  Company's  Form 10-QSB  dated March 31, 1997,  and the
Company's Proxy Statement dated April 10, 1997, and the other documents relating
to an investment in the Common Stock that were included therein or were received
by the Lender from the  Company or from  another  party  acting on behalf of the
Company  prior  to  executing  this  Agreement   (collectively,   the  "Offering
Documents").  Terms used  herein  without  definition  shall  have the  meanings
assigned thereto in the Offering Documents.

2. PAYMENT

     Subject to the terms and  conditions  set forth in the Offering  Documents,
the Lender is hereby required,  together with other lenders, to lend the Company
an amount not to exceed Seven Hundred Fifty Thousand  ($750,000)  Dollars.  Such
amount is to be raised on a Best Efforts  basis and may be advanced  immediately
for use by the Company upon receipt of same.  These loans,  together  comprising
the Bridge Loan are to be made subject to the form or  promissory  Note attached
hereto  as  Exhibit  A.  Andrew,  Alexander,  Wise & Company  Incorporated  (the
"Placement  Agent"),  will transfer the loan amounts as received by the Lenders.
Subsequent to the  execution of the Bridge Loan,  and subject to the approval of
the National  Association of Securities  Dealers,  Inc. ("NASD"),  the Placement
Agent intends to raise a minimum of Four Million  ($4,000,000) Dollars through a
secondary public offering of the Company's Shares,  (the "Secondary  Offering").
The  Placement  Agent will  transfer the  Subscription  payment less ten percent
(10%) sales commission and three percent (3%) non-accountable  expense allowance
earned in the  placement  of the Bridge Loan as such funds are  received by said
Placement Agent. In the event that the  Subscription  payment amount is received
directly by the Company,  the Company shall forward to Placement  Agent any fees
due in connection with such Subscription.

                                     Page 1




3.  ACCEPTANCE OF LOAN

The Company has the right to accept or reject the Loan in whole or in part. This
Agreement  will be deemed to be accepted by the Company  only when signed by the
Company.  Once accepted by the Company,  this loan is irrevocable  except (a) as
required by applicable state  securities laws, and (b) as otherwise  provided in
the Offering Documents.

4.  Lender UNDERSTANDS THAT:

     (a) No federal or state agency has made any finding or  determination as to
the  fairness  of  the  offering  for  investment,   or  any  recommendation  or
endorsement, of the Common Stock.

     (b) Lender's  right to transfer all or any part of the Common Stock will be
restricted  for  the  reasons  and in  the  manner  set  forth  in the  Offering
Documents,  and such Common Stock may not be transferred unless registered under
the Securities Act of 1933, (the  "Securities  Act"),  and any applicable  state
securities  laws, or an exemption from such  registration  is available.  Lender
recognizes  that the Company has not made any  representations  with  respect to
registration  of the Common  Stock under the  Securities  Act or any  applicable
state  securities  laws,  other than set forth in Section  4(c) below,  that the
exemption afforded by Rule 144 under the Securities Act will be available,  that
there is an active current  market for the Common Stock,  and that a sale of the
Common Stock by the Lender will accordingly be restricted.

     (c)  The  Company  will  use  cause  a  registration  statement  under  the
Securities  Act covering the Common Stock (the  "Registration  Statement") to be
filed with the  Commission  upon the first to occur of (i) December 31, 1997; or
(ii)  concurrently with the final closing date for the Secondary  Offering,  and
will use its Best  Efforts  to  cause  such  Registration  Statement  to  become
effective as soon as  practicable.  All expenses of the  Registration  Statement
including,  but not limited to,  legal,  accounting,  printing and other related
fees will be borne by the Company.

5. Lender HEREBY REPRESENTS, WARRANTS AND AGREES THAT:

     (a) Lender is  acquiring  the Common  Stock for  Lender's  own  account for
investment and not for the account of others or with a view to  distribution  or
resale of such Common  Stock or any  interest  therein.  Lender  shall not sell,
hypothecate  or  otherwise  dispose of Common  Stock  except as permitted by the
Offering  Documents  and  unless  such  Common  Stock is  registered  under  the
Securities Act and any  applicable  state  securities  laws or in the opinion of
counsel,  an exemption from the registration  requirements of the Securities Act
and any applicable state securities laws is available.

     (b)  Lender is aware that  Common  Stock may not be  liquidated  readily in
cases of emergency.  Lender has adequate means of providing for Lender's current
needs and possible personal  contingencies and has no need for liquidity of this
investment.

                                     Page 2




     (c) Lender has  carefully  read and  understands  the terms of the Offering
Documents, and the Company has made available to Lender all other documents that
Lender has  requested  relating  to an  investment  in the Common  Stock and has
afforded  Lender the  opportunity  to  discuss  the  investment  with and to ask
questions of the Company and has provided  answers to all of Lender's  questions
concerning  the offering of Common Stock.  The Company has also afforded  Lender
the opportunity to obtain any additional nonproprietary information necessary to
verify the accuracy of any information in the Offering Documents.  In evaluating
the suitability of an investment in the Common Stock, Lender has not received or
relied upon any  representations or other information  (whether oral or written)
made by the  Company  other than as set forth in the  Offering  Documents  or as
contained in other documents supplied at the request of Lender as aforesaid.

     (d) Lender  recognizes  that an  investment  in the Common  Stock  involves
certain risks and Lender has taken full cognizance of and understands all of the
risk  factors  related to a purchase  of the Common  Stock,  including,  without
limitation, those set forth in the "RISK FACTORS" attached hereto as Exhibit B.

     (e) Lender has not relied upon the  Company for any tax or legal  advise in
connection  with  Lender's  purchase of Common  Stock,  and Lender has consulted
Lender's  own adviser  with  respect to the tax and other  legal  aspects of the
acquisition of Common Stock.

     (f) Lender will not duplicate or furnish  copies of the Offering  Documents
to persons other than Lender's investment and tax advisors, accountants or legal
counsel assisting Lender in the evaluation of the Common Stock.

     (g) Lender has such  knowledge  and  experience  in financial  and business
matters generally that Lender is capable of evaluating the meets and risks of an
investment in the Common Stock.  Lender, or Lender's  professional  advisor, has
the capacity to protect  Lender's  concerns in  connection  with the purchase of
Common  Stock,  and Lender is able to bear the economic risk of an investment in
Common Stock.

     (h) Lender, if a corporation,  partnership,  trust or other entity, is duly
formed  and is  validly  existing  and in good  standing  under  the laws of its
jurisdiction of organization and has all powers and is authorized, has taken all
required  action,  and otherwise has duly  qualified to execute and perform this
Agreement and to purchase and hold the Common Stock, and this Agreement has been
duly  executed and  delivered  by Lender and  constitutes  the legal,  valid and
binding obligation of Lender  enforceable  against Lender in accordance with its
terms. The Individual signing this Agreement on behalf of Lender represents that
he or she has full power and authority to execute and deliver this  Agreement in
such capacity and on behalf of Lender. Lender and/or the individual signing this
Agreement on Lender's behalf will provide to the Company such information as its
shall reasonable request to substantiate the foregoing.  Lender has furnished to
the Corporation:

     1.  if  the  Lender  is a  corporation,  the  articles  or  certificate  of
     incorporation and by-laws



                                     Page 3



     of the Lender and a copy  (certified by the  secretary or other  authorized
     officer of the Lender) of  appropriate  corporate  resolutions  authorizing
     Lender's investment in the Common Stock; 

     2.   if Lender is a trust, the trust agreement of Lender;

     3.   if  Lender  is a  partnership,  the  partnership  agreement  (or other
          evidence  of due  authorization  to make  Lender's  investment  in the
          Common Stock.

     (i) Lender,  if executing this agreement in a  representative  or fiduciary
capacity,  has full power and authority to execute and deliver this Agreement in
such  capacity and on behalf of the  subscribing  individual  for whom Lender is
executing  this  Agreement,  and such  individual  has full  right  and power to
perform pursuant to this Agreement and become a shareholder of the Corporation.

     (j) Lender, if a corporation,  partnership,  trust or other entity, was not
formed reformed or  recapitalized  for the specific  purpose of investing in the
Company.

     (k) Lender will make such  additional  representations  and  warranties and
furnish such information  regarding Lender's investment experience and financial
position as the Company may reasonably require.  All information that Lender has
provided to the  Company is correct and  complete as of the date set forth below
and if there should be any material  change in the  information set forth herein
or in any other information  provided to the Company prior to Lender's admission
to the  Company,  Lender will  immediately  furnish  such  revised or  corrected
information to the Company.

     6.  Lender   understands   the  meaning  and  legal   consequences  of  the
representations  and warranties and the restrictions and limitations on transfer
contained in this  Agreement and in the Offering  Documents and hereby agrees to
indemnify  and  hold  harmless  the  Company,   the  Board  members,  and  their
affiliates,  advisors,  agents and employees, from and against any and all loss,
damage or liability due to or arising out of any  inaccuracy in or breach or any
of those representations or warranties by Lender. Notwithstanding the provisions
of this Section 6, however,  no  representation,  warranty,  acknowledgement  or
agreement  made in this  Agreement  by  Lender  will in any  manner be deemed to
constitute  a waiver of any  rights  granted  to Lender  under  federal or state
securities laws. Lender  acknowledges  specifically that the representations and
warranties  and  understandings  and agreements set forth in this Agreement will
survive the date of this Agreement.

7.  CERTIFICATION OF STATUS AS AN ACCREDITED INVESTOR

     Lender certifies that Lender  qualifies as an "accredited  investor" within
the meaning of Rule 501 (a) of  Regulation D  promulgated  under the  Securities
Act, [for the reason set forth herein].  The Lender if an entity has checked the
appropriate box below indicating Lender's status as an accredited investor:

                             (check applicable box)

                                     Page 4




Certain Entities

[ ]  (A) a bank,  as defined in  Section  3(a)(2) of the Act or a savings  and
     loan company or other institution as defined in Section 3(a) (5) (A) of the
     Act;

[ ]  (B) a  broker  or  dealer  registered  pursuant  to  Section  15 of  the
     Securities Exchange Act of 1934, as amended;

[ ]  (C) an insurance company as defined in Section 2(13) of the Act;

[ ]  (D) an investment  company registered under the Investment Company Act of
     1940,  as amended or a business  development  company as defined in Section
     2(a)(48)  thereunder; 

[ ]  (E) A small  business  investment  company  licensed  by the  U.S.  Small
     Business  Administration  under Section 301(c) or (d) of the Small Business
     Investment Act of 1958, as amended;

[ ]  (F) a  private  business  development  company  as  defined  in  Section
     202(a)(22) of the Investment Advisers Act of 1940, as amended;

[ ]  (G) an  organization  described  in  Section  50l(c)(3)  of the  Internal
     Revenue  Code of 1986,  as  amended,  or a  corporation,  Massachusetts  or
     similar  business trust, or partnership not formed for the specific purpose
     of acquiring the securities  offered in the offering in the offering,  with
     total assets in excess of $5,000,000; or

[ ]  (H) a trust with total assets in excess of $5,000,000, not formed for the
     specific purpose of acquiring the securities offered in the offering, whose
     purchase  is  directed  by a  sophisticated  person  as  described  in Rule
     506(b)(2)(ii) promulgated under the Act; or

[ ]  (I) a corporation or  partnership in which each and every  shareholder of
     such  corporation  or each and every partner  (including,  in the case of a
     limited partnership, each and every limited partner) of such partnership is
     an  "accredited  investor"  as  such  term  is  defined  in  Rule  501  (a)
     promulgated under the Act.

OTHER

[ ]  (J) Any natural  person whose  individual  net worth,  or joint net worth
     with that person's spouse, at the time of his purchase exceeds $1,000,000;

[ ]  (K) Any natural person who had an individual income in excess of $200,000
     in each of the two most recent  years or joint  income  with that  person's
     spouse in excess of $300,000  in each of those  years and has a  reasonable
     expectation of reaching the same income level in the current year;

                                     Page 5






[ ]  (L) Any trust,  with total assets in excess of $5,000,000,  not formed for
     the specific purpose of acquiring the securities offered, whose purchase is
     directed by a sophisticated  person  described as having such knowledge and
     experience  in  financial  and  business  matters  that  he is  capable  of
     evaluating  the  merits  and risks of the  prospective  investment,  or the
     issuer reasonably  believes  immediately prior to making the sale that such
     purchaser comes within this description;

[X]  (M) Any entity in which all of the equity owners are accredited investors.

8.  CERTIFICATION OF STATUS AS A UNITED STATES PERSON

Lender hereby  certifies  under  penalties of perjury  that:  (i) if Lender is a
natural person, he or she is a citizen or resident of the United States, or (ii)
if Lender is a partnership, corporation, trust or other entity, it was organized
under the laws of one of the 50 States of the United  States (or the laws of the
District of Columbia).

9.  MISCELLANEOUS

     (a)  Failure by the  Company  to  exercise  any right or remedy  under this
Agreement or any other agreement between the Company and Lender, or delay by the
Company in exercising the same, shall not operate as a waiver.  No waiver by the
Company shall be effective unless it is in writing and signed by the Company.

     (b) In the  event  that any  provision  of this  Agreement  is  invalid  or
unenforceable  under any applicable  statute or rule of law, then such provision
shall be deemed inoperative to the extent that it may conflict with such statute
or rule of law and shall be deemed modified to conform therewith.  Any provision
hereof which may prove invalid or unenforceable shall not affect the validity or
enforceability of any other provision hereof.

     (c) Notices required or permitted to be given under this Agreement shall be
in writing and shall be deemed to be sufficiently  given when sent by registered
or certified  United States mail,  postage  prepaid,  addressed to the party for
whom intended at the address of such party as set forth below.

     (d) This Agreement is not transferable or assignable by Lender.

     (e)  This   Agreement   and  all   questions   relating  to  its  validity,
interpretation,  performance, and enforcement shall be governed and construed in
accordance  with the laws of the State of New  York,  without  giving  effect to
conflict of law principles  (except insofar as affected by the state  securities
or "Blue Sky" laws of the  jurisdiction in which the offerings  described herein
have been made).  Lender  understands  that this  Agreement (i) shall be binding
upon Lender and Lender's legal representatives, successors and assigns and shall
inure to the benefit of the Company,  its  successors  and  assigns,  (ii) shall
survive Lender's admission as a shareholder of the Company; (iii) shall, if

                                     Page 6




Lender consists of more than one person, be the joint and several obligations of
all such persons; and (iv) may be executed by Lender and accepted by the Company
in one or more counterparts, each of which shall be an original and all of which
together shall constitute one instrument.

10. FOR NEW YORK RESIDENTS

     Lender  understands that the offering of Common Stock has not been reviewed
by the  Attorney  General  of the  State of New York  because  of the  Company's
representations  that this is intended to be a non-public  offering  pursuant to
Regulation  D  promulgated  under  the  Securities  Act,  and that if all of the
conditions  and  limitations of Regulation D are not complied with, the offering
will be  resubmitted  to the  Attorney  General  for amended  exemption.  Lender
understands  that any offering  literature used in connection with this offering
has not been  pre-filed  with the Attorney  General and has not been reviewed by
the  Attorney  General.  The Common  Stock is being  purchased  for Lender's own
account for investment,  and not for  distribution  or resale to others.  Lender
agrees that Lender will not sell or  otherwise  transfer the Common Stock unless
an exemption from such registration is available.  Lender represents that Lender
has adequate means of providing for Lender's current needs and possible personal
contingencies, and that Lender has no need for liquidity of this investment.

     All documents,  records,  and books pertaining to this investment have been
made available for inspection by Lender's  attorney and/or  Lender's  accountant
and  Lender,  and the books and records of the Company  will be  available  upon
reasonable  notice,  for  inspection  by  investors at  reasonable  hours at its
principal place of business.

11.  FORM OF OWNERSHIP

     Please indicate the form of ownership you desire for the Common Stock;

     Individual (one signature required)
- ----
     Joint Tenants with Right of Survivorship (all parties must sign)
- ----
     Tenants in Common (all parties must sign)
- ----
     Tenants by the Entirety (all parties must sign)
- ----
     Community  Property (one  signature  required if interest held in one name,
     i.e. managing spouse;  two signatures  required if interest is held in both
     names)
- ----
 X   Corporation (signature of authorized officer or officers required)
- ----
     Partnership  (signature of general  partner and any  additional  signatures
     required by partnership agreement required)
- ----


                                     Page 7




     Trust (signature of trustee and any additional signatures required by trust
     instrument required)
- ----
     Other Entities (all signatures required by governing instrument required)
- ----


Please  PRINT  below the exact  name  (registration)  you  desire for the Common
Stock:

World Spirit Inc.
- ------------------------------


In WITNESS  WHEREOF,  Lender has executed this  Agreement  this 16th day of June
1997.

If Lender is a Natural Person:

- ------------------------------
(Signature of Lender)

- ------------------------------
(Name of Lender)
(Please Print of Type)


If Lender is not a Natural Person:

World Spirit Inc.
- --------------------------------
(Type or Print Name of Corporation, Partnership, Trust or Other Entity)


- --------------------------------
(Signature of Individual Signing)



(Capacity of Individual Signing on behalf of Corporation, Partnership, Trust
 or Other Entity)

                                     Page 8




                 Investment Representation Letter and Agreement

                             Name: World Spirit Inc.

                        Address: 350 5th Ave., suite 6603
                            New York, New York 10018
                                  June 16, 1997


ProtoSource Corporation
2300 Tulare Street, Suite 210
Fresno, California 93721

        
I am  receiving  50,000  (50,000)  shares (the  "Shares") of the common stock of
ProtoSource  Corporation,  a  California  corporation  (the  "Company"),  for no
additional  consideration,  in  connection  with a concurrent  loan by me to the
Company.  I  understand  and  acknowledge  that the Shares will be shares of the
common stock of the Company.

In connection therewith, I hereby represent and certify to you and agree that:

     1. I am  receiving  the Shares for  investment  only and not with a view to
their resale or  distribution.  I am not receiving the Shares as a result of any
advertisement, general solicitation, public meeting or other public offering.

     2. I understand that the Shares are not registered under the Securities Act
of 1933, as amended (the "Act"),  or qualified  under the  California  Corporate
Securities  Law  of  1968,  as  amended  (the"CSL"),  and  must  be  held  by me
indefinitely  unless  they  are  subsequently  registered  under  the  Act,  and
qualified under the CSL, or an exemption from such registration or qualification
is available.  I understand that the resale of such Shares will be restricted so
that such resale may be made only in accordance with the appropriate  exemptions
(including  holding  such  Shares  for  periods  of time  specified  in Rule 144
promulgated under the Act and compliance with the other provisions  thereof,  if
such exemption is available)  under the Act and the CSL, or  registration  under
the Act and qualification under the CSL.

     3. I am an  accredited  investor  as that term is defined in  Regulation  D
under the Act.  Based upon my  experience  in business and as an investor,  I am
aware of the risks of an investment in restricted securities, and I have no need
for any income from my  investment.  I am aware that the Hares may have no value
now, and the Company has not made any representation as to their value now or in
the future.  I have such  knowledge  and  experience  in financial  and business
matters so that I am capable of assessing  the merits and risks of acquiring the
Shares. I have reviewed the Company's definitive  prospectus dated May 14, 1997,
the Company's last Form 1O-QSB,  and its proxy  statement  dated April 10, 1997,
and have  had an  opportunity  to ask  questions  of and  receive  answers  from
management  of the Company  and to obtain any  additional  information  that the
Company possesses or can acquire without unreasonable effort or expense relating
to the  Company's  business,  financial  condition  and  results  of  operation,
although the Company has made no  representation or warranty except as expressly
contained herein.




     4. I  understand  that all  certification  evidencing  the Shares will bear
legend substantially in the following form:

     "The Securities  represented by this  certificate  have not been registered
     under the  Securities  Act of 19337 as amended  (the  "Act"),  or qualified
     under  any  state  securities  law.  These  securities  may  not  be  sold,
     transferred,  pledged  or  hypothecated  in  the  absence  of an  effective
     registration statement for the securities under the Act and qualified under
     any  applicable  state  securities  law,  or unless an  opinion  of counsel
     acceptable to counsel to the Company, and other assurances  satisfactory to
     the Company, have been delivered to the Company prior to the transaction to
     the effect that registration and qualification is not required."

     5. I have consulted with the and legal counsel selected by the undersigned,
and with such financial advisors,  who have reviewed the merits of an investment
in the Shares.  The  undersigned,  together  with such persons,  has  sufficient
knowledge and experience in business and financial matters to evaluate the meets
of the risks of an investment in the Shares, and the undersigned, fully aware of
the  risks  involved,  has  determined  that  an  investment  in the  Shares  is
consistent  with the  undersigned's  investment  objectives.  The  undesigned is
relying  solely o~ e  undersigned's  own tax  advisors  with  respect to the tax
factors relating to an investment in the Shares.

     6. I understand  that 10% of my loan  proceeds to the (Company will be used
to pay sales  commissions to Andrew,  Alexander  Wise and Company,  Incorporated
(hereinafter  "AAWC")  ~  connection  with  this  transaction.  In  addition,  I
understand  that AAWC shall be allocated an additional 3% of my loan proceeds as
and for a non-accountable expense allowance.

     7. I hereby agree as follows:

     (a) If the undersign,  or any subsequent holder, desires to transfer any of
the Shares,  the  undersigned  must give to the Company prior written  notice of
such  proposed  transfer   including  the  name  and  address  of  the  proposed
transferee.  Unless  registered and qualified as provided herein,  such transfer
may be made  only  either  (i)  upon  publication  by  Securities  and  Exchange
Commission (the "Commission") of a ruling, interpretation, opinion or "no action
letter" based upon facts  presented to the  Commission,  or (ii) upon receipt by
the Company of an opinion of counsel  acceptable  to counsel to the Company,  in
either  case to the effect  that the  proposed  transfer  will not  violate  the
provisions  of the Act, the  Securities  Exchanges  Act of 1934,  as amended any
state securities laws, or the rules and regulations  promulgated  under any such
acts or laws.

     (b) Prior to any such proposed  transfer,  and as a condition  thereto,  if
such offer is not made pursuant to our effective  registration  statement  under
the Act, the undersigned,  or any subsequent  holder,  will, if requested by the
Company,  deliver  to the  Company  (i)  and  investment  letter  setting  forth
investment   representations  of  the  proposed  transferee  and  such  proposed
transferee's  covenant to comply with the transfer  provisions set forth in this
Section 7 and elsewhere in this  Agreement,  signed by the proposed  transferee,
and (ii) an agreement  by the  transferee  to indemnify  the Company to the same
extent as set forth in Section 7 (c) hereof.

     (c) The  undersigned  acknowledges  that the  undersigned  understands  the
meaning and legal consequences of the  representation  and warranties  contained
herein,  and the  undersigned  hereby  agrees to indemnify and hold harmless the





Company  and its  agents  and  representatives  and each of their  heirs,  legal
representative, successors and assigns from and against any and all loss, damage
or  liability  (including  without  limitation  all  attorneys'  fees and  costs
incurred in enforcing this indemnity provision) due to or arising out of (i) the
inaccuracy  of  any  representation  or  the  breach  of  any  warranty  of  the
undersigned  contained in, or any other breach of, this letter  agreement,  (ii)
any transfer of any of the Shares in violation  of the Act, the  Securities  and
Exchange Act of 1934, as amended,  any state  securities  laws, or the rules and
regulation promulgated under any of such acts or laws, (iii) any transfer of any
to the Shares not in accordance herewith or (iv) any undue statement or omission
to state any material fact in connection with the investment  representation  or
with respect to the facts and  representations  supplied by the  undersigned  to
counsel to the Company  upon which its opinion as to a proposed  transfer  shall
have been based.

     (d) The  Company  may  place a stop  order  with  its  transfer  agent  and
registrar,  if any, with respect to any of the Shares or any  certificates  unto
which such Shares are exchanged.

     (e)  Notwithstanding  the above,  the Company will use cause a registration
statement under the Securities Act covering the Common Stock (the  "Registration
Statement")  to be filed  with  the  Commission  upon the  first to occur of (i)
December  31, 1997;  or (ii)  concurrently  with the final  closing date for the
Secondary  Offering  and will use its Best  Efforts to cause  such  Registration
Statement  to become  effective  as soon as  practicable.  All  expenses  of the
Registration  Statement  including,  but  not  limited  to,  legal,  accounting,
printing and other related fees will be done by the Company.

     8. In  conjunction  with  the  investment  referred  to in this  Investment
Representation  Letter and  Agreement,  by its execution of the  acceptance  and
agreement below, Company agrees as follows:

     (a) Upon  funding  and proper  documentation  of the loan  which  serves as
consideration for the issuance of the Shares, the Company agrees to issue to the
undersigned investor for no additional consideration one (1) share of its common
stock for each five  dollars  ($5.00)  lent to the  Company  by the  undersigned
investor.

     (b) The Company will offer not more than $750,000 of aggregated  loans on a
Best Efforts Basis only.

                                      Very truly yours,

                                      World Spirit Inc.
                                      -----------------------------------------
                                       Investor


                                       ----------------------------------------
                                       Name (Please Type or Print)
                                       By: President


Accepted and agreed to:
Dated: June  , 1997
ProtoSource Corporation, a California corporation




By:
Name:  Raymond Meyers
Title:  Chief Executive Officer






                                                      Exhibit A to Exhibit 10.20

                                PROMISSORY NOTE

$250,000                                                     New York, New York
- ---------

                                                                   June 16, 1997
                                                                   -------------
                                                                   Date

A.  GENERAL; TERMS OF PAYMENT; USE OF PROCEEDS; PREPAYMENT

     1.  FOR  VALUE  RECEIVED,  the  undersigned,   ProtoSource  Corporation,  a
corporation organized under the laws of the State of California (the"Borrower"),
hereby promises to pay to the order of WORLD SPIRIT INC.(the  "Lender"),  at the
offices of Andrew, Alexander,  Wise & Company,  Incorporated hereinafter "AAWC")
at 17 State  Street,  New York,  New York 10004 the principal sum of $250,000 on
the first to occur of the following; (i) upon the closing of a public or private
offering of securities of the Borrower for at least  $1,000,000 (the "Closing");
or (ii) fifteen months from the date hereof.

     The Borrower will pay interest on the unpaid principal amount hereof at the
rate of 12 per cent per  annum  computed  on the  basis of a  360-day  year,  at
maturity (whether by acceleration or otherwise).

     The loan proceeds shall be used as bridge financing until the occurrence of
the Closing.

     2.  PREPAYMENT.  The  Borrower  shall have the right to prepay this Note in
whole or in part at any time without penalty or premium.

B.  EVENTS OF DEFAULT; REMEDIES

     1. If any of the following  events shall occur and be  continuing  (each an
"Event of Default")  (a) the  Borrower  fails to make any payment when due under
the Note; (b) the Borrower shall default in the performance or observance of any
covenant or agreement contained herein or any agreement between the Borrower and
the Lender; (c) the Borrower sells, agrees to sell, leases, agrees to lease to a
third party all or  substantially  all of its assets or stock;  (d) the Borrower
terminates its business  operations;  (e) any representation or warranty made by
or on  behalf  of  the  Borrower  in  this  Note  or in any  other  certificate,
agreement,  instrument  or statement  delivered to the Lender by or on behalf of
the  borrower  shall at any time prove to have been  incorrect  when made in any
material respect;  (f) the Borrower shall default in the payment of principal or
interest on any  indebtedness for borrowed money including  without  limitation,
any  portion of the  Credit  (as such term is defined  below) of which this loan
forms a part, or shall default in the  performance or observance of the terms of
any instrument  pursuant to which such  indebtedness  was created or is secured,
the  effect  of which  default  is to cause or  permit  any  holder  of any such
indebtedness  to cause the same to become due prior to its stated  maturity (and
whether or not such default is waived by the holder  thereof;  (g) any change in
the condition or affairs  (financial  or otherwise) of the Borrower  shall occur
which, in the opinion of the Lender, increases its risk with respect to the loan
evidenced  by  this  Note;  (h)  any  judgement  against  the  Borrower  or  any




attachment,  levy, or execution  against any of there  properties for any amount
shall remain unpaid or shall not be released,  discharged  dismissed,  stayed or
fully bonded for a period of thirty (30) days or more after its entry,  issue or
levy, as the case may be; (i) the Borrower  shall become  insolvent or be unable
or admit in writing its inability,  to pay its debts as they mature;  or (j) the
Borrower  shell make an  assignment  for the benefit of  creditors or a trustee,
receiver or  liquidator  shall be appointed for the Borrower or for any of their
property,  or the  commencement  of any  proceeding  by the  Borrower  under any
bankruptcy, reorganization arrangement of debt insolvency, readjustment of debt,
receivership,  liquidation or dissolution law or statute, or the commencement of
any such  proceeding  without the consent of the  Borrower  and such  proceeding
shall  continue  undischarged  for a period of 30 days.  Then,  the  Lender  may
declare the entire  unpaid  principal  amount of this Note and all  interest and
fees accrued and unpaid  hereon to be forthwith  due and payable,  whereupon the
same shall become and be forthwith due and payable by the Borrower.

     2. In case any one or more  Event(s)  of  Default  hereunder  or under  any
related  document shall happen and be continuing,  Lender may proceed to protect
and  enforce  Lender's  rights  either by suit in equity or by action at law, or
both,  whether for the  specific  performance  of any  covenant,  condition,  or
agreement contained in this Note, or in aid of the exercise of any power granted
in this Note to enforce any other legal or equitable  right of Lender.  After an
Event of Default,  Borrower shall pay to Lender  immediately upon written demand
therefore  any amounts  reasonably  expended or incurred by Lender in collecting
any amount due  hereunder  including,  without  limitation,  attorneys  fees and
costs, whether or not any legal action is instituted in connection therewith.

C.  MISCELLANEOUS

     1.  Amendments.  No amendment,  modification  or waiver of any provision of
this Note nor  consent  to any  departure  by the  Borrower  therefrom  shall be
effective  unless the same shall be in writing and signed by the Lender and then
such waiver or consent shall be effective only in the specific  instance and for
the specific purpose for which it is given.

     2. Constructions. This Note shall be deemed to be a contract made under the
laws of the State of New York and shall be construed in accordance with the laws
of said State.

     3. Successors and Assigns. This Note shall be binding upon the Borrower and
its heirs, legal  representatives,  successors and assigns, and the terms hereof
shall  inure to the  benefit  of the  Lender  and its  successors  and  assigns,
including subsequent borders thereof.

     4.  Severability.  The  provisions of this Note are  severable,  and if any
provision  shall be held  invalid  or  unenforceable  in whole or in part in any
jurisdiction,  then such  invalidity or  enforceability  shall not in any manner
affect such provision in any other  jurisdiction  or any other provision of this
Note in any jurisdiction.

     5. No Waiver: Remedies Cumulative.  No failure on the part of the Lender to
exercise  and no delay in  exercising  any right  hereunder  shall  operate as a
waiver  thereof;  nor shall any single or partial  exercise by the Lender of any
right hereunder  preclude any other or further  exercise thereof or the exercise





of any other right Borrower hereby waives presentment,  demand,  protest, notice
of dishonor  and all other  notices and demands,  except as expressly  set forth
herein. Borrower also hereby waives the right to trial by jury in any litigation
related to this Note. written.

     6. Costs and Expenses. The Borrower shall reimburse the Lender of all costs
and expenses  incurred by it and shall pay the reasonable fees and disbursements
of counsel to the Lender  connection  with the enforcement of the Lenders rights
hereunder. The Borrower shall also pay any and all taxes (other than taxes on or
measured by net income of the holder of this Note)  incurred in connection  with
the execution and delivery of this Note.

     7. Series of Notes.  This, Note is one of a series of notes executed by the
Borrower in connection  with the  extension of credit made by various  creditors
(together the "Creditor") in the aggregate  principal amount up to $750,000 (the
"Credit~).  In consideration of the extension of the Credit, each Creditor shall
receive  shares of the Common  stock in  proportion  to the amount of the Credit
which is extended by such  Creditor;  the  aggregate  number of shares of Common
Stock of the Borrower shall be up to 150,000 shares.

     IN WITNESS  WHEREOF,  Borrower has  executed  this Note on the day and year
first above



                                     ProtoSource Corporation

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

                                     Name:  Raymond Meyers
                                     Title:  Chief Executive Officer





                         REGISTRATION RIGHTS AGREEMENT

                              W I T N E S S E T H:
                              --------------------

     WHEREAS,  the  Stockholders  are the  purchasers of am aggregate of 150,000
shares of Common Stock of the Company (the "Shares")  issued in connection  with
interim  financing  on this date of the  Company in an  aggregate  amount not to
exceed $750,000 (the "Bridge Financing"), and

     WHEREAS,  the Company and the  Stockholders  desire that certain  terms and
provisions be applicable to the Shares  hereinafter  referred to as  Registrable
Securities") held by the Stockholders;

     NOW, THEREFORE,  in consideration of the covenants and agreements set forth
herein, and for other good and valuable consideration,  the adequacy and receipt
of which are hereby acknowledged, the parties hereby agree as follows:

     Section 1. Registration  Rights.  The Company covenants and agrees with the
Stockholders  that the  Company  will  file  with the  Securities  and  Exchange
Commission ("SEC") a Registration  Statement,  (the "Registration  Statement") a
post-effective amendment to an existing Registration Statement (the "Amendment")
or a  Regulation  A  Offering  Statement  (an  "Offering  Statement")  under the
Securities  Act of 1933, as amended (the "Act"),  registering  or qualifying the
Registrable  Securities for sale concurrently with the proposed Secondary Public
Offering of the Company's  Securities (the "Secondary  Offering) to be placed by
Andrew Alexander Wise & Company, Incorporated (the "Placement Agent") or if such
Secondary  Offering is not completed by December 31, 1997.  The Company will use
its best efforts,  through its officers,  directors,  auditors md counsel in all
matters  necessary or advisable,  to cause to become effective such Registration
Statement as promptly as  practicable,  and, for a period of one year hereafter,
to reflect in the  Amendment,  Registration  Statement  or  Offering  Statement,
financial  statements  which are prepared in accordance with Section 10(a)(3) of
the Act and any facts or events arising that, individually, or in the aggregate,
represent a fundamental  and/or  material change in the information set forth in
the  Amendment,  Registration  Statement  or  Offering  Statement  to enable any
Stockholder of the Registrable  Securities to sell such  Registrable  Securities
during said two-year period.

     Section 2. Piggyback  Registration Rights. The Company covenants and agrees
with the Stockholders  and any other holders of the Registrable  securities that
if, at anytime  within the period  commencing  from the date hereof,  and ending
five  (5)  years  thereafter,  it  proposes  to file a  Registration  Statement,
Amendment  or  Offering  Statement,   as  the  case  may  be  (collectively,   a
"Registration  Statement")  with  respect to any class of  security  (other than
pursuant to a Registration  Statement on Forms S-4 or S-8 or any successor form)
under the Act in a primary  registration  on behalf of the  Company and for in a
secondary registration on behalf of holders of securities,  and the Registration
Statement to be used may be used for registration of the Registrable Securities,
the  Company  will  give  written  notice  to the  holders  of  the  Registrable
Securities  at least  thirty (30) days prior to the filing of such  Registration
Statement  at the  addresses  appearing  on the  records  of the  Company of its
intention to file a Registration Statement, and will offer to include in such

                                     Page 1




Registration  Statement,  all or any portion of the Shares, and limited,  in the
case of a  Regulation A offering,  the amount of the  available  exemption.  The
offer to include  the Shares is  limited  by  subparagraphs  (a) and (b) of this
Section 2. In any event,  the maximum  number of  Registrable  Securities  which
shall be  registered  shall not exceed  that  number for which the  Company  has
received written  requests for inclusion  therein within fifteen (15) days after
the  giving of notice by the  Company  The  Company  will use its best  efforts,
through its officers,  directors,  auditors and counsel in all matters necessary
or  advisable,  to cause to become  effective  such  Registration  Statement  as
promptly as practicable.  All registrations requested pursuant to this Section 2
are referred to herein as "Piggyback Registrations." All Piggyback Registrations
pursuant to this Section 2 will be made solely at the Company's expense,  except
for  the  Stockholders'  co~el  fees  and  sales  commissions  incurred  if  the
Registrable Securities be sold.

     (a) Priority on Primary Registrations. If a Piggyback Registration includes
     an  underwritten  primary  registration  on behalf of the  Company  and the
     underwriter  so  requests,  the  Company  and such  holder  of  Registrable
     Securities will enter into an underwriting  agreement with such underwriter
     for such offering,  which shall be reasonably satisfactory in substance and
     form  to the  Company,  such  holder  of  Registrable  Securities  and  the
     underwriter,  and such  agreement  shall contain such  representations  and
     warranties by the Company md such holder of Registrable Securities and such
     other terms and  provisions as are  customarily  contained in  underwriting
     agreement  with  respect  to  secondary  distributors,  including,  without
     limitation,  indemnities  substantially  to the  effect  and to the  extent
     provided Section 8.  Furthermore,  if the  underwriter(s)  for the offering
     being  registered by the Company  shall  determine ln good faith and advise
     the company in writing that in its/their  opinion the number of Registrable
     Securities requested to be included in such registration exceeds the number
     that can be sold in such offering without  materially  adversely  affecting
     the  distribution  of such securities by the Company (such opinion to state
     the reasons  therefor).  then the Company will promptly furnish the holders
     of the  Registrable  Securities with a copy of such opinion and the Company
     will  include in such  registration  (1)  first,  the  securities  that the
     Company  proposes  to sell  and (ii)  second,  the  Registrable  Securities
     requested  to be included in such  registration,  apportioned  and pro rata
     among the holders of the Registrable Securities,  but in any event not less
     than 50% of the Shares? and (iii) third, securities of the holders of other
     securities requesting registration.

     (b)  Priority  on  Secondary  Registrations.  If a  Piggyback  Registration
     consists  only of an  underwritten  secondary  registration  on  behalf  of
     holders  of  securities  of the  Company  and  the  underwriter(s)  for the
     offering being registered by the Company advise the Company in writing that
     in its/their opinion the number of Registrable  Securities  requested to be
     included in such  registration  exceeds the number that can be sold in such
     offering without  materially  adversely  affecting the distribution of such
     securities  by the Company  (such  opinion to state the reasons  therefor).
     then the Company  will  promptly  furnish  the  holders of the  Registrable
     Securities with a copy of such opinion and the Company will include in such
     registration (1) first, the securities  requested to be included therein by
     the holders  requesting such  registration  and the Registrable  Securities
     requested to be included in such

                                     Page 2




     registration  above,  pro rata,  among all such holders on the basis of the
     number of shares  requested to be included by each such holder,  but in any
     event  not less than 50% of the  Registrable  Securities  and (ii)  second,
     other securities requested to be included in such registration.

Notwithstanding  the foregoing,  if any such underwriter shall determine in good
faith and advise the Company in writing that the distribution of the Registrable
Securities  requested to be included in the registration  concurrently  with the
securities being registered by the Company would materially adversely affect the
distribution  of  such  securities  by the  Company,  then  the  holders  of the
Registrable  Securities  shall  delay  their  offering  and sale for such period
ending  on the  earliest  of (i) 90 days  following  the  effective  date of the
Company's  registration  Statement,  (ii) the day upon  which  the  underwriting
syndicate,  if any, for such offering  shall have been  disbanded or, (iii) such
date as the Company,  managing underwriter and holders of Registrable Securities
shall otherwise  agree. In the event of such delay,  the Company shall file such
supplements,  post-effective  amendments and take any such other steps as may be
necessary to permit such holders to make their proposed  offering and sale for a
period of 120 days immediately following the end of such period of delay. If any
party  disapproves  of the  terms  of any  such  underwriting,  it may  elect to
withdraw  therefrom by written notice to the Company,  the underwriter,  and the
Stockholder's.  Notwithstanding the foregoing, the Company shall not be required
to file a registration statement to include Shares pursuant to this Section 2 if
an  opinion  of  independent  counsel  for  the  Stockholders,  that  all of the
Registrable Securities proposed to be disposed of may be transferred pursuant to
the  provisions  of Rule 144 under the Act shall have been  delivered to counsel
for the Company.

     Section 3. Other  Registration  Rights.  In  addition  to the rights  above
provided, the Company will cooperate with the then Stockholders in preparing and
signing any Registration  Statement,  in addition to the Registration Statements
and Offering Statements  discussed above,  required In order to sell or transfer
the Registrable  Securities and will supply all information  required  therefor,
but such  additional  Registration  Statement shall be at the then Holders' cost
and  expense;  provided,  however,  that if the Company  elects to register  and
qualify  additional  shares  of Common  Shares,  the cost and  expenses  of such
Registration Statement will be pro-rated, between the Company and the Holders of
the  Registrable  Securities  according  to the  aggregate  sales  price  of the
securities being registered.

     Section 4. Certain  Understandings.  The  Stockholders  understand that the
Company makes no representations of any kind concerning its intent or ability to
offer  or  sell  any of the  Registrable  Securities  in a  public  offering  or
otherwise and that its sole rights to have the Registrable Securities registered
under the Act are contained in this Agreement.  So long as there are Registrable
Securities  outstanding and the Company is subject to the reporting requirements
of the Act and the Securities  E;exchange Act of 1934 (the "Exchange  Act"), the
Company  will file the reports  required to be filed by it under the Act and the
Exchange Act and the rules and  regulations  adopted by the SEC  hereunder,  and
will take such  further  action as the  holders of  Registrable  Securities  may
reasonably  request,  all to the extent required from time to time to enable the
holders of Registrable  Securities without registration under the Act within the
limitation of the exemptions provided by (i) Rule 144

                                     Page 3




under  the Act,  as such  Rule may be  amended  from  time to tune,  or (ii) any
similar rule or regulation hereafter adopted by the SEC. Upon the request of the
holders of  Registrable  Securities,  the Company will deliver to the holders of
Registrable  Securities a written  statement as to whether it has complied  with
such information requirements.

     Section 5. Company Obligations.  In connection with the registration of the
Registrable Securities pursuant to this agreement, the Company shall:

     (a)  furnish  to the  holders  of  the  Registrable  Securities  and to the
     underwriter(s),  if any,  thereof such  reasonable  number of copies of the
     Registration Statement,  preliminary prospectus,  final prospectus and such
     other  documents as such holders and  underwriters  may request in order to
     facilitate the public offering of such securities;

     (b) use its best efforts to register or qualify the Registrable  Securities
     under state securities laws of the jurisdictions  which the holders thereof
     may  reasonably  request in writing  within 20 days  following the original
     filing of such  Registration  Statement,  and do any and all other acts and
     things  which may be  necessary  or  advisable  to enable  the  holders  of
     Registrable   Securities  to  consummate  the  disposition  of  Registrable
     Securities  in such  jurisdictions  except  that the  Company  shall not be
     required  to execute a general  consent to service of process or to qualify
     to do business as a foreign  corporation in any jurisdiction  wherein it is
     not so qualified;

     (c) notify the holders of the  Registrable  Securities  promptly  when such
     Registration   Statement  has  become  effective  or  a  supplement  to  my
     prospectus  forming a part of such  Registration  Statement has been filed;
     and

     (d) advise the holders of the  Registrable  Securities,  promptly  after it
     shall.receive  notice or obtain  knowledge  thereof of the  issuance of any
     stop order by the SEC suspending  the  effectiveness  of such  Registration
     Statement,  or the  initiation or  threatening  of any  proceeding for that
     purpose and  promptly  use its best  efforts to prevent the issuance of any
     stop order or to obtain its withdrawal if such stop order should be issued.

     (e) prepare and file with the SEC such  amendments and  supplements to such
     Registration Statement,  and the prospectus used in connection therewith as
     may be  necessary  to keep such  Registration  Statement  effective  and to
     comply with the  provisions of the Act with respect to the  disposition  of
     all   Registrable   Securities  and  other   securities   covered  by  such
     Registration  Statement,  until the earlier of (a) such time as all of such
     Registrable  Securities and securities  have been disposed of in accordance
     with the intended  methods of disposition by seller or sellers  thereof set
     forth in such  Registration  Statement,  or (b) the  expiration  of 90 days
     after such Registration Statement becomes effective,

     (f)  furnish  to  the  holders  of  the  Registrable  Securities  a  signed
     counterpart, addressed to the holders of the Registrable Securities, of (a)
     an opinion of counsel for the Company

                                     Page 4




     dated the  effective  date of such  registration  statement  (and,  if such
     registration  includes an underwritten  public offering,  dated the date of
     the closing of such underwritten public offering), and (b) a "cold comfort"
     letter signed by the independent  public accountants who have certified the
     Company's  financial  statements  included in such Registration  Statement,
     covering  substantially  the same matters with respect to such registration
     statement  (and the prospectus  included  therein) and, in the case of such
     accountants'  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   accountants'   letters   delivered  to  underwriters  in
     underwritten  public  offerings  of  securities  and,  in the  case  of the
     accountants'  letter,  such other financial matters,  as the holders of the
     Registrable Securities may reasonably request;

     (g) promptly notify the holders of the  Registrable  Securities at any time
     when a prospectus  relating  thereto is required to be delivered  under the
     Act,  of the  happening  of my event as a result  of which  the  prospectus
     included in such registration  statement,  as then in effect, would include
     an untrue  statement of a material  fact or omit to state any material fact
     re~red to be stated therein or necessary to malice the  statements  therein
     not misleading in the light of the circumstances then existing,  and at the
     reasonable request of the holders of the Registrable Securities prepare and
     furnish to the holders of the Registrable  Securities such number of copies
     of a supplement  to or an amendment of such  prospectus as may be necessary
     so that, as  thereafter  delivered to the  purchasers  of such  Registrable
     Securities  of  securities,  such  prospectus  shall not  include an untrue
     statement of a material  fact or omit to state a material  fact required to
     be  stated  therein  or  necessary  to  make  the  statements  therein  not
     misleading in the light of the circumstances under which they were made,

     (h) in  connection  with the  preparation  and  filing of the  Registration
     Statement  registering  Registrable  Securities  under the Act, the Company
     will give the  holders of  Registrable  Securities  and their  counsel  and
     accountants,  the  opportunity to  participate  in the  preparation of such
     registration statement,  each prospectus included therein or filed with the
     SEC, and each amendment thereof or supplement  thereto,  and will give each
     of them such  access to its books and  records  and such  opportunities  to
     discuss the business of the Company  with its officers and the  independent
     public accountants who have certified its financial  statements as shall be
     reasonably  necessary,  in  the  opinion  of  the  holders  of  Registrable
     Securities,  or their counsel, to conduct a reasonable investigation within
     the meaning of the Act.

     (i) otherwise use of all of its or their reasonable  efforts to comply with
     all applicable  rules and  regulations of the SEC and make available to its
     securities  holders,  as  soon  as  reasonably  practicable,   an  earnings
     statement covering the period of at least twelve months beginning after the
     effective date of such  registration  statement,  which earnings  statement
     shall satisfy the provisions of the Section ii(a) of the Act; and

                                     Page 5




     (j) provide and cause to be maintained a transfer  agent and registrant for
     such  Registrable  Securities  from  and  after a date not  later  than the
     effective date of such registration statement.

     Section 6.  Expenses.  The  Company  will bear all  expenses  attendant  to
registering the  Registrable  Securities,  including,  without  limitation,  all
registration  and filing  fees,  all  listing  fees,  all fees and  expenses  of
complying with securities or blue sky laws, all word processing, duplicating and
printing   expenses,   messenger   and  delivery   expenses  and  the  fees  and
disbursements of counsel for the Company and its independent public accountants,
including the expenses of "cold comfort" letters and expenses any special audits
required by or incident to such  performance and compliance,  premiums and other
costs of policies of policies of insurance  against  liabilities  arising out of
the public offering of the Registrable  Securities being registered and any fees
and  disbursements  of underwriters  customarily  paid by issuers and sellers of
securities,  but  excluding  underwriting  discounts  and  commissions,  if any,
applicable to the sale of such securities. Furthermore, the Company shall not be
required to pay the fees an  disbursements  of counsel and  accountants  for any
holder of  Registrable  Securities or other  expenses  incurred by any holder of
Registrable Securities or other expenses incurred by any holder thereof that are
not  customarily  paid by an issuer in response to the exercise of  registration
rights.

     Section 7.  Indemnification and Contribution.  The Stockholders  understand
that  indemnification  and  contribution  provisions  such as the  following are
customarily included in an underwriting agreement and agree that they will enter
into an  agreement  containing~  such  provisions  or  provisions  substantially
similar thereto as a condition  precedent to the  registration by the Company of
any of their Registrable Securities:

     (s) The Company will indemnify and hold harmless each holder of Registrable
     Securities which are included in a Registration  Statement  pursuant to the
     provisions of this  Agreement and any  underwriter  (as defined in the Act)
     for such holder, each officer,  director,  employee,  agent and counsel, if
     any,  of each such holder and  underwriter,  and each  person,  if any' who
     controls such holder or such  underwriter  within the meaning of Section 15
     of the Act or  Section  20(a) of the  Exchange  Act  (each,  a "person  who
     controls" or a "controlling  person"),  from and against, any and all loss,
     claim, damage, liability, costs and expense (including, without limitation,
     reasonable  legal  expenses) to which such holder or any such  underwriter,
     officer,  director,  employee,  agent,  counsel of  controlling  person may
     become subject under the Act or otherwise,  insofar as such losses, claims,
     damages,  liabilities,  costs or  expenses  (or actions or  proceedings  in
     respect  thereof)  arise out of or are based upon any untrue  statement  or
     alleged   untrue   statement  of  any  material  fact   contained  in  such
     Registration  statement,  any prospectus contained therein or any amendment
     or  supplement  thereto,  or arise out of or are based upon the omission or
     alleged  omission to state  therein a material  fact  required to be stated
     therein  or  necessary  to make  the  statement  therein,  in  light of the
     circumstances in which they were made, not misleading;  provided,  however,
     that the Company will not be liable in any such case to the extent that any
     such loss, claim,  damage,  liability,  cost or expense arises out of or is
     based upon an untrue statement or alleged untrue

                                     Page 6




     statement or omission or alleged  omission so made in reliance  upon and in
     strict  conformity  with  information  furnished  by or on  behalf  of such
     holder,  underwriter,   officer,  director,  employee,  agent,  counsel  or
     controlling  person  in  writing  specifically  for use in the  preparation
     thereof.

     (b) Each  holder  of  Registrable  Securities  included  in a  registration
     pursuant  to the  provisions  of this  Agreement  will  indemnify  and hold
     harmless the Company, any underwriter,  each officer,  director,  employee,
     agent,  counsel  of and  each  person  who  controls  the  Company  or such
     underwriter  from and against,  any and all losses,  damages,  liabilities,
     costs or expenses to which the Company or such officer, director' employee,
     agent,  counsel or  controlling  person may become subject under the Act or
     otherwise, insofar as such losses, damages, liabilities,  costs or expenses
     are  caused by any untrue  statement  of alleged  untrue  statement  of any
     material fact  contained in such  Registration  Statement,  any  prospectus
     contained therein or any amendment or supplement  thereto,  or arise out of
     or are based upon the  omission  or  alleged  omission  to state  therein a
     material  fact  required  to be stated  therein  or  necessary  to make the
     statements  thereon, in light of the circumstances in which they were made,
     not misleading,  in each case to the extent,  but only to the extent,  that
     such untrue  statement or alleged  untrue  statement or omission or alleged
     omission was so made in reliance upon and in strict conformity with written
     information  furnished by or on behalf or such holder  specifically for use
     in the preparation thereof,

     (c)  Promptly  after  receipt  by an  indemnified  party  pursuant  to  the
     provisions  of  Section  7(a) or (b) of notice of the  commencement  of any
     action involving the subject matter of the foregoing indemnity  provisions,
     shall  indemnified  part will, if a claim thereof is to be made against the
     indemnifying  party pursuant to the provisions of said  subparagraph (a) or
     (b),  promptly notify the indemnifying  party of the commencement  thereof,
     but the  omission to so notify the  indemnifying  party will not relieve it
     from any liability  which it may have to any  indemnified  party  otherwise
     than  hereunder.  In case such action is brought  against  any  indemnified
     party and it notifies the indemnifying  party of the commencement  thereof,
     the indemnifying  party shall have the right to participate in, and, to the
     extent  that  it may  wish,  jointly  with  any  other  indemnifying  party
     similarly notified,  to assume the defense thereof, with counsel reasonably
     satisfactory  to  such  indemnified  party;   provided,   however,  if  the
     defendants  in any  action  include  both  the  indemnified  party  and the
     indemnifying   party  and  the  indemnified  party  shall  have  reasonably
     concluded  that there may be legal  defenses  available  to it and/or other
     indemnified  parties  which  are  different  from or in  addition  to those
     available to the indemnifying  party, or if there is a conflict of interest
     which  would  prevent  counsel  for  the   indemnifying   party  from  also
     representing the indemnified  party, the indemnified party or parties shall
     have the right to select separate  counsel to participate in the defense of
     such action on behalf of such  indemnified  party or parties.  After notice
     from the indemnifying party to such indemnified party of its election so to
     assume the defense thereof,  the  indemnifying  party will not be liable to
     such  indemnified  party  pursuant to the provisions of Section 7(a) or (b)
     for any legal or other expenses  subsequently  incurred by such indemnified
     party in connection with the defense

                                     Page 7




     thereof,  other  than  reasonable  costs of  investigation,  unless (i) the
     indemnified  party  shall  have  employed  counsel in  accordance  with the
     provisions of the immediately  preceding  sentence,  (ii) the  indemnifying
     party  shall  not have  employed  counsel  reasonably  satisfactory  to the
     indemnified  party to represent the  indemnified  party within a reasonable
     time  after  notice  of  the  commencement  of the  action,  or  (iii)  the
     indemnifying  party  has  authorized  the  employment  of  counsel  for the
     indemnified party at the expense of the indemnifying party.

     (d)  If the  indemnification  provided  for  in  this  Section  7 from  the
     indemnifying  party is  unavailable to an  indemnified  party  hereunder in
     respect of any losses,  claims, damages or liabilities referred to therein,
     then the  indemnifying  party,  in lieu of  indemnifying  such  indemnified
     party,  shall  contribute to the amount paid or payable by such indemnified
     party, as a result of such losses,  claims,  damages or liabilities in such
     proportion  as is  appropriate  to  reflect  the  relative  fault  of  such
     indemnifying  party and indemnified  parties in connection with the actions
     which resulted in such losses, claims,  damages or liabilities,  as well as
     any other  relevant  equable  considerations.  The  relative  fault of such
     indemnifying party and indemnified parties shall be determined by reference
     to, among other things, whether any action in question including any untrue
     or alleged  untrue  statement  of a material  fact or  omission  or alleged
     omission  to state a  material  fact,  has  been  made by,  or  relates  to
     information supplied by, such indemnifying party or indemnified parties and
     the  parties'  relative  intent,  knowledge,   access  to  information  and
     opportunity to correct or prevent such action, provided,  however, that any
     holder of Registrable  Securities shall not be required to contribute in an
     amount  greater  than the dollar  amount of the  proceeds  received by such
     holder  of  Registrable   Securities  with  respect  to  the  sale  of  any
     securities.  The  amount  paid or  payable  by a party as a  result  of the
     losses, claims,  dan~ages and liabilities referred to above shall be deemed
     to include,  subject to the  limitations set for~ in this Section 7(d). any
     legal  or other  fees or  expenses  reasonably  incurred  by such  party in
     connection with any investigation or proceeding.

     The  parties  hereto  agree  that it  would  not be just and  equitable  if
contribution  pursuant  to  this  Section  7(d)  were  determined  by  pro  rata
allocation or by any other method of allocation  which, does not take account of
the equitable considerations referred to in the immediately preceding paragraph.
No person  guilty of a  fraudulent  misrepresentation  (within  the  meaning  of
Section 1 l(f) of the Act) shall be entitled to contribution from any person who
was not guilty of such fraudulent misrepresentation

     Section 8. No  Inconsistent  Agreements.  The Company shall not on or after
the  date of this  Agreement  enter  into  amy  agreement  with  respect  to its
securities  which is  inconsistent  with the rights  granted  to the  holders of
Registrable   Securities,   this  Agreement  or  otherwise  conflicts  with  the
provisions hereof. The Company has not previously entered into or become a party
to nor is it bound by any agreement with respect to its securities  granting any
registration rights to any person,  except as set forth in or as contemplated by
the Merger Agreement. The rights granted to the holders of the securities of the
Company under any other agreements.

                                     Page 8




Section 9.  Miscellaneous.

     (a) All notices or other communications given or made hereunder shall be in
     writing and shall be delivered by hand, against written receipt,  or mailed
     by registered or certified mail, ret~n receipt requested,  postage prepaid,
     to the Stockholders at their respective address appearing on the records of
     the Company and to the  Company at its  address  set forth  above.  Notices
     shall be deemed given on the date of receipt or, if mailed,  three business
     days after  ma~ling,  except  notices of change of address,  which shall be
     deemed given when received.

     (b)  Notwithstanding  the place where this Agreement may be executed by the
     Stockholders  or the Company,  they agree that all the terms and provisions
     hereof shall be construed  in  accordance  with and governed by the laws of
     the State of New York without regard to principles of conflict of laws.

     (c)  This  Agreement   constitutes   the  entire   agreement   between  the
     Stockholders  and the Company with respect to the subject matter hereof and
     may be amended only by writing executed by each of them.

     (d) This  Agreement  shall be binding upon and inure to the benefit of each
     of the  Stockholder'  and the Company  and their  respective  heirs,  legal
     representatives, successors and assigns.

     (e)  The   Stockholders   and  the  Company  each  hereby   submit  to  the
     non-exclusive  jurisdiction  of the courts of the State of New York located
     in New York,  New York and of the federal  courts  located in the  Southern
     District  of New York  with  respect  to any  action  or  legal  proceeding
     commenced  by either  of them  with  respect  to this  Agreement  or to the
     Registrable Securities.  Each of them irrevocably waives any objection they
     now have or hereafter may have  respecting  the venue of any such action or
     proceeding  brought in such a court or  respecting ~e fact that such courts
     an  inconvenient  forum and  consents to the service of process in any such
     action or  proceeding  by means of  registered  or certified  mail,  return
     receipt  requested,  in care of the  address set forth above or below or at
     such other address as either of them shall furnish in writing to the other.

     (f) The parties hereto  acknowledge and agree that irreparable damage would
     occur in the event that any of the  provisions of this  Agreement  were not
     performed  in  accordance  with  their  specific  terms  or were  otherwise
     breached. It is accordingly agreed that the parties shall be entitled to an
     injunction or  injunctions to prevent or cure breaches of the provisions of
     this  Agreement,  this being in addition to any other  remedy to which they
     may be entitled by law or equity.

     (g) The invalidity or  unenforceability of any provisions of this Agreement
     shall not affect the validity or  enforceability  of any other provision of
     this Agreement.

                                     Page 9



     (h) The waiver by either the Stockholders or the Company of a breach of any
     provision of this Agreement shall not operate, or be construed, as a waiver
     of any subsequent breach or any provision of this Agreement.

     (i) The  Stockholders  and the  Company  agree to execute  and  deliver all
     further  documents,  agreements  and  instruments  and to take  such  other
     further action as may be necessary or appropriate to carry out the purposes
     and intent of this Agreement.

     (j) This  Agreement  may be executed by one or more  counterparts,  each of
     which  shall  be  deemed  an  original,  but all of  which  shall  together
     constitute one and the same instrument.

     (k) References in this Agreement to the pronouns  "him," "he" and "his" are
     not  intended to convey the  masculine  gender  alone and are employed in a
     generic sense and apply equally to the feminine gender or to an entity.

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
firrt written above.

                                      ProtoSource Corporation

                                      By: 
                                          -------------------------------------
                                          Name: Raymond Meyers
                                          Title: Chief Executive Officer


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



WORLD SPIRIT INC.
- -------------------------------           -------------------------------------
By Its President



                                    Page 10