SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 12b-25

                         Commission File Number 33-86242

                           NOTIFICATION OF LATE FILING

|_| Form 10-K        |_| Form 11-K         |_| Form 20-F         |X| Form 10-Q
|_| Form N-SAR

    For Period Ended: September 30, 2000

|_| Transition Report on Form 10-K
|_| Transition Report on Form 10-Q
|_| Transition Report on Form 20-F
|_| Transition Report on Form N-SAR

    For the Transition Period Ended: ___________________________________________

     Nothing in this form shall be construed to imply that the Commission has
verified any information contained herein.

     If the notification relates to a portion of the filing checked above,
identify the item(s) to which the notification relates:

________________________________________________________________________________

________________________________________________________________________________


                                     PART I
                             REGISTRANT INFORMATION

Full name of registrant                           ProtoSource Corporation
Former name if applicable
Address of principal executive office             2300 Tulare Street, Suite 210
City, state and zip code                          Fresno, California 93721


                                     PART II
                             RULE 12b-25 (b) AND (c)

     If the subject report could not be filed without unreasonable effort or
expense and the registrant seeks relief pursuant to Rule 12b-25 (b), the
following should be completed. (Check box if appropriate.)

     (a)  The reasons described in reasonable detail in Part III of this form
          could not be eliminated without unreasonable effort or expense;

     (b)  The subject annual report, semi-annual report, transition report on
          Form 10-K, 20-F, 11-K or Form 10-Q, or portion thereof will be filed
          on or before the 15th calendar day following the prescribed due date;
|X|       or the subject quarterly report or transition report on Form 10-Q, or
          portion thereof will be filed on or before the fifth calendar day
          following the prescribed due date; and

     (c)  The accountant's statement or other exhibit required by Rule 12b-25(c)
          has been attached if applicable.




                                    PART III
                                    NARRATIVE

     State below in reasonable detail the reasons why Form 10-K, 11-K, 20-F,
10-Q, N-SAR or the transition report portion thereof could not be filed within
the prescribed time period.

     The registrant is in the process of preparing and reviewing the financial
information of the Company on a consolidated basis. The process of compiling and
disseminating the information required to be included in the Form 10-Q for the
relevant fiscal quarter, as well as the completion of the required review of the
Company's financial information on a consolidated basis, could not be completed
without incurring undue hardship and expense. The registrant undertakes the
responsibility to file such annual report no later than five days after its
original date.


                                     PART IV
                                OTHER INFORMATION

(1)  Name and telephone number of person to contact in regard to this
     notification

     William Conis                    (559)                  486-8600
        (Name)                     (Area Code)          (Telephone Number)

(2)  Have all other periodic reports required under Section 13 or 15(d) of the
     Securities Exchange Act of 1934 or Section 30 of the Investment Company Act
     of 1940 during the preceding 12 months or for such shorter period that the
     registrant was required to file such report(s) been filed? If the answer is
     no, identify report(s).

                                 |X| Yes |_| No

(3)  Is it anticipated that any significant change in results of operations from
     the corresponding period for the last fiscal year will be reflected by the
     earnings statements to be included in the subject report or portion
     thereof?

                                 |X| Yes |_| No

     If so: attach an explanation of the anticipated change, both narratively
     and quantitatively, and, if appropriate, state the reasons why a reasonable
     estimate of the results cannot be made.

     We anticipate disclosing an impairment in the valuation of Infosis Corp. of
over $500,000. See above for a discussion on why ProtoSource could not file its
Form 10-QSB in the prescribed time.


                             ProtoSource Corporation
                             -----------------------
                   Name of Registrant as Specified in Charter.

Has caused this notification to be signed on its behalf by the undersigned
thereunto duly authorized.

Date: November 15, 2000                       By: /s/ William Conis
                                              ---------------------
                                              William Conis, President