SUMMIT VENTURES II LP
SC 13G/A, 1997-02-14
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                                  UNITED STATES            
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 1 )*

                        Diamond Multimedia Systems, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.001 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    252714100
                       ----------------------------------
                                 (CUSIP Number)


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

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






                               Page 1 of 38 Pages







CUSIP No. 252714100                      13G                        PAGE 2 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Summit Ventures II, L.P.

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware limited partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]    
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 2 of 38 Pages






CUSIP No. 252714100                      13G                        PAGE 3 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Summit Ventures III, L.P.

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware limited partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 3 of 38 Pages






CUSIP No. 252714100                      13G                        PAGE 4 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Summit Subordinated Debt Fund, L.P.

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware limited partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]   
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 4 of 38 Pages






CUSIP No. 252714100                      13G                        PAGE 5 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Summit Partners II, L.P.

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware limited partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 5 of 38 Pages






CUSIP No. 252714100                      13G                        PAGE 6 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Summit Partners III, L.P.

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware limited partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 6 of 38 Pages






CUSIP No. 252714100                      13G                        PAGE 7 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Summit Partners SD, L.P.

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware limited partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 7 of 38 Pages






CUSIP No. 252714100                      13G                        PAGE 8 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Summit Investors II, L.P.

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware limited partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 8 of 38 Pages






CUSIP No. 252714100                      13G                        PAGE 9 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Stamps, Woodsum & Co. II

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Massachusetts general partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 9 of 38 Pages






CUSIP No. 252714100                      13G                       PAGE 10 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Stamps, Woodsum & Co. III

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Massachusetts general partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 10 of 38 Pages






CUSIP No. 252714100                      13G                       PAGE 11 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                E. Roe Stamps, IV

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 11 of 38 Pages






CUSIP No. 252714100                      13G                       PAGE 12 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Stephen G. Woodsum

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 12 of 38 Pages






CUSIP No. 252714100                      13G                       PAGE 13 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Gregory M. Avis

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 13 of 38 Pages






CUSIP No. 252714100                      13G                       PAGE 14 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                John A. Genest

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 14 of 38 Pages






CUSIP No. 252714100                      13G                       PAGE 15 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Martin J. Mannion

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 15 of 38 Pages






CUSIP No. 252714100                      13G                       PAGE 16 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Ernest K. Jacquet

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 16 of 38 Pages






CUSIP No. 252714100                      13G                       PAGE 17 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Bruce R. Evans

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 17 of 38 Pages






CUSIP No. 252714100                      13G                       PAGE 18 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Thomas S. Roberts

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 18 of 38 Pages






CUSIP No. 252714100                      13G                       PAGE 19 OF 38

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Walter G. Kortschak

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

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        5,100,868 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       5,100,868 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                5,100,868 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [  ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                14.9%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 19 of 38 Pages






                                  Schedule 13G


Item 1(a).        Name of Issuer:  Diamond Multimedia Systems, Inc.

Item 1(b).        Address of Issuer's Principal Executive Offices: 2880 Junction
                  Avenue, San Jose, CA 95134
                  
Item 2(a).        Names of Persons  Filing:  Summit  Ventures II,  L.P.,  Summit
                  Ventures III, L.P.,  Summit Partners II, L.P., Summit Partners
                  III, L.P., Summit Partners SD, L.P., Summit  Subordinated Debt
                  Fund, L.P., Summit Investors II, L.P.,  Stamps,  Woodsum & Co.
                  II, Stamps,  Woodsum & Co. III, and Messrs. E. Roe Stamps, IV,
                  Stephen G. Woodsum, Gregory M. Avis, John A. Genest, Martin J.
                  Mannion,  Ernest K. Jacquet, Bruce R. Evans, Thomas S. Roberts
                  and Walter G. Kortschak.

                  Summit Partners II, L.P. is the sole general partner of Summit
                  Ventures  II,  L.P.  Summit  Partners  III,  L.P.  is the sole
                  general  partner of Summit  Ventures III, L.P. Summit Partners
                  SD, L.P. is the sole  general  partner of Summit  Subordinated
                  Debt Fund, L.P.  Stamps,  Woodsum & Co. II is the sole general
                  partner of Summit Partners II, L.P. Stamps,  Woodsum & Co. III
                  is the sole  general  partner of Summit  Partners  III,  L.P..
                  Stamps,  Woodsum  & Co.  III is the sole  general  partner  of
                  Summit  Partners  SD,  L.P.  Messrs.  Stamps,  Woodsum,  Avis,
                  Genest,  Mannion,  Jacquet,  Evans,  Roberts and Kortschak are
                  individual  general  partners  of  Stamps,  Woodsum & Co.  II,
                  Stamps, Woodsum & Co. III and Summit Investors II, L.P.

Item 2(b).        Address of Principal  Business Office or, if None,  Residence:
                  The  address  of  the  principal  business  office  of  Summit
                  Ventures II, L.P.,  Summit Ventures III, L.P., Summit Partners
                  II, L.P.,  Summit  Partners III,  L.P.,  Summit  Investors II,
                  L.P.,  Stamps,  Woodsum & Co. II,  Stamps,  Woodsum & Co. III,
                  Summit Subordinated Debt Fund, L.P., Summit Partners SD, L.P.,
                  and Messrs. Stamps, Woodsum,  Mannion,  Genest, Jacquet, Evans
                  and Roberts is Summit Partners,  600 Atlantic Avenue,  Boston,
                  Massachusetts  02210.  The address of the  principal  business
                  office of Messrs.  Avis and Kortschak is Summit Partners,  499
                  Hamilton Avenue, Palo Alto, California 94301.

Item 2(c).        Citizenship: Each of Summit Ventures II, L.P., Summit Ventures
                  III,  L.P.,  Summit   Subordinated  Debt  Fund,  L.P.,  Summit
                  Partners II, L.P., Summit Partners III, L.P., Summit Investors
                  II,  L.P.,   and  Summit   Partners  SD,  L.P.  is  a  limited
                  partnership organized under the laws of the State of Delaware.
                  Each of Stamps, Woodsum & Co. II and Stamps, Woodsum & Co. III
                  is a  general  partnership  organized  under  the  laws of the
                  Commonwealth  of  Massachusetts.   Each  of  Messrs.   Stamps,
                  Woodsum, Avis, Mannion,  Genest,  Jacquet,  Evans, Roberts and
                  Kortschak is a United States citizen.


                               Page 20 of 38 Pages




Item 2(d).        Title of Class of  Securities:  Common Stock,  $.001 par value
                  per share.

Item 2(e).        CUSIP Number:   252714100

Item 3.           If this  statement  is filed  pursuant to Rules  13d-1(b),  or
                  13d-2(b), check whether the person filing is a:
                 
                  (a)   [   ]      Broker or Dealer  registered under Section 15
                                   of the  Securities  Exchange Act of 1934 (the
                                   "Act").

                  (b)   [   ]      Bank as  defined  in  Section  3(a)(6) of the
                                   Act.

                  (c)   [   ]      Insurance   Company  as  defined  in  Section
                                   3(a)(19) of the Act.

                  (d)   [   ]      Investment Company registered under Section 8
                                   of the Investment Company Act of 1940.

                  (e)   [   ]      Investment  Adviser  registered under Section
                                   203 of the Investment Advisers Act of 1940.

                  (f)   [   ]      Employee Benefit Plan,  Pension Fund which is
                                   subject  to the  provisions  of the  Employee
                                   Retirement  Income  Security  Act of  1974 or
                                   Endowment  Fund; see Rule  13d-1(b)(1)(ii)(F)
                                   of the Act.

                  (g)   [   ]      Parent Holding  Company,  in accordance  with
                                   Rule 13d-1(b)(ii)(G) of the Act.

                  (h)   [   ]      Group,     in     accordance     with    Rule
                                   13d-1(b)(1)(ii)(H) of the Act.

                  Not Applicable

Item 4.           Ownership.

                  (a)   Amount Beneficially Owned:

                        Each of Summit  Ventures II, L.P.,  Summit Ventures III,
                        L.P.,  Summit   Subordinated  Debt  Fund,  L.P.,  Summit
                        Investors  II, L.P.,  Summit  Partners II, L.P.,  Summit
                        Partners III, L.P.,  Summit  Partners SD, L.P.,  Stamps,
                        Woodsum  & Co.  II,  and  Stamps,  Woodsum  &  Co.  III,
                        (individually   an   "Entity"   and   collectively   the
                        "Entities") may be deemed to own beneficially  5,100,868
                        shares of Common Stock as of December 31, 1996.  Each of
                        Messrs. Stamps, Woodsum, Avis, Mannion, Genest, Jacquet,
                        Evans,  Roberts  and  Kortschak  may  be  deemed  to own
                        beneficially  5,100,868  shares  of  Common  Stock as of
                        December 31, 1996.


                               Page 21 of 38 Pages




                        As of December 31, 1996,  Summit  Ventures III, L.P. was
                        the record owner of 4,265,263 shares of Common Stock. As
                        of December 31, 1996,  Summit Investors II, L.P. was the
                        record owner of 103,734  shares of Common  Stock.  As of
                        December  31,  1996,  Summit  Ventures  II, L.P. was the
                        record  owner of 43,425  shares of Common  Stock.  As of
                        December 31, 1996,  Summit  Subordinated Debt Fund, L.P.
                        was the record owner of 688,446  shares of Common Stock.
                        The shares held of record by Summit  Ventures III, L.P.,
                        Summit Investors II, L.P.,  Summit Ventures II, L.P. and
                        Summit  Subordinated  Debt Fund,  L.P.  are  referred to
                        herein collectively as the "Record Shares". By virtue of
                        the affiliate  relationships  among the  Entities,  each
                        Entity  may be  deemed  to own  beneficially  all of the
                        Record Shares.  Hence,  each Entity may be deemed to own
                        beneficially  5,100,868 shares of Common Stock. In their
                        capacities  as  individual  general  partners of Stamps,
                        Woodsum & Co. II, Stamps,  Woodsum & Co. III, and Summit
                        Investors  II, L.P.,  each of Messrs.  Stamps,  Woodsum,
                        Avis,  Mannion,  Genest,  Jacquet,  Evans,  Roberts  and
                        Kortschak  may be deemed to own  beneficially  5,100,868
                        shares of Common Stock.

                  (b)   Percent of Class:

                        Summit Ventures II, L.P.:  14.9%
                        Summit Partners II, L.P.:  14.9%
                        Summit Ventures III, L.P.:  14.9%
                        Summit Partners III, L.P.:  14.9%
                        Summit Subordinated Debt Fund, L.P.:  14.9%
                        Summit Partners SD, L.P.:  14.9%
                        Summit Investors II, L.P.:  14.9%
                        Stamps, Woodsum & Co. II:  14.9%
                        Stamps, Woodsum & Co. III:  14.9%
                        E. Roe Stamps, IV:  14.9%
                        Stephen G. Woodsum:  14.9%
                        Gregory M. Avis:  14.9%
                        Martin J. Mannion:  14.9%
                        John A. Genest:  14.9%
                        Ernest K. Jacquet:  14.9%
                        Bruce R. Evans:  14.9%
                        Walter G. Kortschak:  14.9%
                        Thomas S. Roberts: 14.9%

                        The foregoing  percentages  are calculated  based on the
                        34,279,267   shares  of  Common  Stock  reported  to  be
                        outstanding at September 30, 1996 in a Quarterly  Report
                        on Form 10-Q for Diamond  Multimedia  Systems,  Inc. for
                        the quarter ended September 30, 1996.

                  (c)   Number of shares as to which such person has:


                               Page 22 of 38 Pages





                        (i)    sole power to vote or to direct the vote:

                               0 shares for each reporting person

                       (ii)    shared power to vote or to direct the vote:

                               Summit Ventures II, L.P.:  5,100,868 shares
                               Summit Partners II, L.P.:  5,100,868 shares
                               Summit Ventures III, L.P.:  5,100,868 shares
                               Summit Partners III, L.P.: 5,100,868 shares
                               Summit Subordinated Debt Fund, L.P. 15,100,868
                                 shares
                               Summit Partners SD, L.P.: 5,100,868 shares
                               Summit Investors II, L.P.:  5,100,868 shares
                               Stamps, Woodsum & Co. II:  5,100,868 shares
                               Stamps, Woodsum & Co. III:  5,100,868 shares
                               E. Roe Stamps, IV:  5,100,868 shares
                               Stephen G. Woodsum:  5,100,868 shares
                               Gregory M. Avis:  5,100,868 shares
                               Martin J. Mannion:  5,100,868 shares
                               John A. Genest:  5,100,868 shares
                               Ernest K. Jacquet:  5,100,868 shares
                               Bruce R. Evans:  5,100,868 shares
                               Walter G. Kortschak:  5,100,868 shares
                               Thomas S. Roberts: 5,100,868 shares

                      (iii)    sole power to  dispose or direct the  disposition
                               of:

                               0 shares for each reporting person

                       (iv)    shared power to dispose or direct the disposition
                               of:

                               Summit Ventures II, L.P.:  5,100,868 shares
                               Summit Partners II, L.P.:  5,100,868 shares
                               Summit Ventures III, L.P.:  5,100,868 shares
                               Summit Partners III, L.P.: 5,100,868 shares
                               Summit  Subordinated  Debt Fund,  L.P.  5,100,868
                                 shares
                               Summit Partners SD, L.P.: 5,100,868 shares
                               Summit Investors II, L.P.:  5,100,868 shares


                               Page 23 of 38 Pages




                               Stamps, Woodsum & Co II:  5,100,868 shares
                               Stamps, Woodsum & Co. III:  5,100,868 shares
                               E. Roe Stamps, IV:  5,100,868 shares
                               Stephen G. Woodsum:  5,100,868 shares
                               Gregory M. Avis:  5,100,868 shares
                               Martin J. Mannion:  5,100,868 shares
                               John A. Genest:  5,100,868 shares
                               Ernest K. Jacquet:  5,100,868 shares
                               Bruce R. Evans:  5,100,868 shares
                               Walter G. Kortschak:  5,100,868 shares
                               Thomas S. Roberts: 5,100,868

                  Each of the reporting persons expressly  disclaims  beneficial
                  ownership of any shares of Common Stock of Diamond  Multimedia
                  Systems,  Inc.,  except  in the case of Summit  Ventures  III,
                  L.P.,  for the 4,265,263  shares which it holds of record,  in
                  the case of  Summit  Subordinated  Debt  Fund,  L.P.,  for the
                  688,446 shares which it holds of record, in the case of Summit
                  Ventures  II,  L.P.,  for the 43,425  shares which it holds of
                  record,  and in the case of Summit Investors II, L.P., for the
                  103,734 shares which it holds of record.

Item 5.           Ownership of Five Percent or Less of a Class.

                  Not Applicable.

Item 6.           Ownership  of More than  Five  Percent  on  Behalf of  Another
                  Person.

                  Not Applicable.

Item 7.           Identification  and  Classification  of the  Subsidiary  which
                  Acquired the Security  Being Reported on By the Parent Holding
                  Company.

                  Not Applicable.

Item 8.           Identification and Classification of Members of the Group.

                  Not  Applicable.  The  reporting  persons  expressly  disclaim
                  membership in a "group" as defined in Rule 13d-1(b)(ii)(H).

Item 9.           Notice of Dissolution of Group.

                  Not Applicable.

Item 10.          Certification.

                  Not  Applicable.  This  statement on Schedule 13G is not filed
                  pursuant to Rule 13d-1(b).


                               Page 24 of 38 Pages





                                   SIGNATURES

      After reasonable  inquiry and to the best of our knowledge and belief,  we
certify that the information  set forth in this statement is true,  complete and
correct.  We also hereby agree to file this  statement  jointly  pursuant to the
Agreement listed on Exhibit 1 hereto.

Dated:  February 14, 1997

SUMMIT VENTURES III, L.P.                        SUMMIT INVESTORS II, L.P.

By:   Summit Partners III, L.P.                  By: /s/ John A. Genest
                                                    ----------------------------
                                                    General Partner
By:   Stamps, Woodsum & Co. III
                                                 SUMMIT PARTNERS III, L.P.
      By:           *
         -------------------------
         E. Roe Stamps, IV                       By:   Stamps, Woodsum & Co. III
         General Partner
                                                       By:            *
                                                          ----------------------
SUMMIT SUBORDINATED DEBT FUND, L.P.                       E. Roe Stamps, IV
                                                          General Partner
By:   Summit Partners SD, L.P.
                                                 SUMMIT PARTNERS SD, L.P.
By:   Stamps, Woodsum & Co. III
                                                 By:   Stamps, Woodsum & Co. III
      By:           *
         -------------------------
         E. Roe Stamps, IV                             By:            *
         General Partner                                  ----------------------
                                                          E. Roe Stamps, IV
                                                          General Partner
SUMMIT VENTURES II, L.P.
                                                 SUMMIT PARTNERS II, L.P.
By:   Summit Partners II, L.P.
                                                 By:   Stamps, Woodsum & Co. II
By:   Stamps, Woodsum & Co. II
                                                       By:            *
                                                          ----------------------
      By:           *                                         E. Roe Stamps, IV
         -------------------------                            General Partner
         E. Roe Stamps, IV                                
         General Partner


                               Page 25 of 38 Pages






STAMPS, WOODSUM & CO. III                         STAMPS, WOODSUM & CO. II

By:             *                                  By:          *
   -----------------------                             ---------------------
   E. Roe Stamps, IV                                   E. Roe Stamps, IV
   General Partner                                     General Partner


                                                                *
                                                       ---------------------
                                                       E. Roe Stamps

                                                                *
                                                       ---------------------
                                                       Stephen G. Woodsum

                                                                *
                                                       ---------------------
                                                       Martin J. Mannion

                                                       /s/ John A. Genest
                                                       ---------------------
                                                       John A. Genest

                                                                *
                                                       ---------------------
                                                       Gregory M. Avis

                                                                *
                                                       ---------------------
                                                       Ernest K. Jacquet

                                                                *
                                                       ---------------------
                                                       Bruce R. Evans

                                                                *
                                                       ---------------------
                                                       Walter G. Kortschak

                                                                *
                                                       ---------------------
                                                       Thomas S. Roberts



                                                       * By: /s/ John A. Genest
                                                            -------------------
                                                            John A. Genest
                                                            Attorney-in-Fact


- --------------------------------------------------------------------------------
* Pursuant to Powers of Attorney on file with the  Commission,  which  Powers of
Attorney are incorporated herein by reference. Copies of such Powers of Attorney
are attached hereto as Exhibit 2.


                               Page 26 of 38 Pages





                                                                       Exhibit 1
                                                                       ---------

                                    AGREEMENT

      Pursuant to Rule  13d-1(f)(1)  under the Securities  Exchange Act of 1934,
the undersigned hereby agree that only one statement  containing the information
required by Schedule 13G need be filed with respect to the  ownership by each of
the undersigned of shares of Common Stock of Diamond Multimedia Systems, Inc.

      This  agreement  may be  executed in any number of  counterparts,  each of
which shall be deemed an original.

      EXECUTED this 14th day of February, 1997.

SUMMIT VENTURES III, L.P.                        SUMMIT INVESTORS II, L.P.

By:   Summit Partners III, L.P.                  By: /s/ John A. Genest
                                                    ----------------------------
                                                    General Partner
By:   Stamps, Woodsum & Co. III
                                                 SUMMIT PARTNERS III, L.P.
      By:           *
         -------------------------
         E. Roe Stamps, IV                       By:   Stamps, Woodsum & Co. III
         General Partner
                                                       By:            *
                                                          ----------------------
SUMMIT SUBORDINATED DEBT FUND, L.P.                       E. Roe Stamps, IV
                                                          General Partner
By:   Summit Partners SD, L.P.
                                                 SUMMIT PARTNERS SD, L.P.
By:   Stamps, Woodsum & Co. III
                                                 By:   Stamps, Woodsum & Co. III
      By:           *
         -------------------------
         E. Roe Stamps, IV                             By:            *
         General Partner                                  ----------------------
                                                          E. Roe Stamps, IV
                                                          General Partner
SUMMIT VENTURES II, L.P.
                                                 SUMMIT PARTNERS II, L.P.
By:   Summit Partners II, L.P.
                                                 By:   Stamps, Woodsum & Co. II
By:   Stamps, Woodsum & Co. II
                                                       By:            *
                                                          ----------------------
      By:           *                                         E. Roe Stamps, IV
         -------------------------                            General Partner
         E. Roe Stamps, IV                                
         General Partner


                               Page 27 of 38 Pages






STAMPS, WOODSUM & CO. III                         STAMPS, WOODSUM & CO. II

By:             *                                  By:          *
   -----------------------                             ---------------------
   E. Roe Stamps, IV                                   E. Roe Stamps, IV
   General Partner                                     General Partner


                                                                *
                                                       ---------------------
                                                       E. Roe Stamps

                                                                *
                                                       ---------------------
                                                       Stephen G. Woodsum

                                                                *
                                                       ---------------------
                                                       Martin J. Mannion

                                                       /s/ John A. Genest
                                                       ---------------------
                                                       John A. Genest

                                                                *
                                                       ---------------------
                                                       Gregory M. Avis

                                                                *
                                                       ---------------------
                                                       Ernest K. Jacquet

                                                                *
                                                       ---------------------
                                                       Bruce R. Evans

                                                                *
                                                       ---------------------
                                                       Walter G. Kortschak

                                                                *
                                                       ---------------------
                                                       Thomas S. Roberts



                                                       * By: /s/ John A. Genest
                                                            -------------------
                                                            John A. Genest
                                                            Attorney-in-Fact


- --------------------------------------------------------------------------------
* Pursuant to Powers of Attorney on file with the  Commission,  which  Powers of
Attorney are incorporated herein by reference. Copies of such Powers of Attorney
are attached hereto as Exhibit 2.

                               Page 28 of 38 Pages






                                                                       Exhibit 2
                                                                       ---------

                                 POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS,  that each person whose  signature  appears
below hereby constitutes and appoints each and any of E. Roe Stamps, IV, Stephen
G.  Woodsum and John A. Genest his true and lawful  attorney-in-fact  and agent,
with full power of  substitution  and  resubstitution,  for him and in his name,
place and stead,  in any and all  capacities  (until revoked in writing) to sign
any and all instruments,  certificates and documents  required to be executed on
behalf of himself  individually or on behalf of each or any of Summit  Ventures,
L.P., Summit Partners,  L.P., Stamps,  Woodsum & Co., Summit Partners' Holdings,
L.P., Summit Ventures II, L.P., Summit Partners II, L.P., Stamps,  Woodsum & Co.
II, SV Eurofund C.V., SV International,  L.P., Stamps,  Woodsum  International &
Co., Summit  Investors,  L.P.,  Summit Investors II, L.P., Summit Investors III,
L.P.,  Summit Ventures III, L.P., Summit Partners III, L.P.,  Stamps,  Woodsum &
Co. III, Summit Ventures IV, L.P., Summit Partners IV, L.P.,  Stamps,  Woodsum &
Co., IV,  Summit  Subordinated  Debt Fund,  L.P.,  Summit  Partners SD, L.P., SW
Management Corp., Summit Management Co., Summit Subordinated Debt Fund II, L.P.,
and Summit Partners SD II, LLC, pursuant to sections 13 and 16 of the Securities
Exchange  Act of  1934,  as  amended  (the  "Exchange  Act"),  and  any  and all
regulations  promulgated  thereunder,  and to file the same,  with all  exhibits
thereto,  and any other documents in connection  therewith,  with the Securities
and Exchange Commission,  and with any other entity when and if such is mandated
by the Exchange Act or by the By-laws of the National  Association of Securities
Dealers,  granting unto said attorney-in-fact and agent full power and authority
to do and perform each and every act and thing  requisite and necessary fully to
all intents and  purposes as she might or could do in person  thereby  ratifying
and confirming all that said  attorney-in-fact  and agent,  or her substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

                                  Page 29 of 38







     IN WITNESS  WHEREOF,  this Power of Attorney has been signed as of the 10th
day of February, 1997.

                                             /s/ E. Roe Stamps, IV
                                             -----------------------------------
                                             E. Roe Stamps, IV

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this  10th day of  February,  1997,  before  me  personally  came E. Roe
Stamps, IV known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Cynthia R. Freedman
                                               ---------------------------------
                                               Notary Public

                                               October 20, 2000
                                               ---------------------------------
                                               My Comission expires:


                                  Page 30 of 38





     IN WITNESS  WHEREOF,  this Power of Attorney has been signed as of the 10th
day of February, 1997.

                                             /s/ Stephen G. Woodsum
                                             -----------------------------------
                                             Stephen G. Woodsum

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this 10th day of February,  1997,  before me personally  came Stephen G.
Woodsum  known to me to be the person  described  and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Cynthia R. Freedman
                                               ---------------------------------
                                               Notary Public

                                               October 20, 2000
                                               ---------------------------------
                                               My Comission expires:

                                  Page 31 of 38




     IN WITNESS  WHEREOF,  this Power of Attorney has been signed as of the 10th
day of February, 1997.

                                             /s/ Martin J. Mannion
                                             -----------------------------------
                                             Martin J. Mannion
                                             
    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this 10th day of February,  1997,  before me  personally  came Martin J.
Mannion  known to me to be the person  described  and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Cynthia R. Freedman
                                               ---------------------------------
                                               Notary Public

                                               October 20, 2000
                                               ---------------------------------
                                               My Comission expires:


                                  Page 32 of 38





     IN WITNESS  WHEREOF,  this Power of Attorney has been signed as of the 10th
day of February, 1997.

                                             /s/ John A. Genest
                                             -----------------------------------
                                             John A. Genest

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this  10th day of  February,  1997,  before me  personally  came John A.
Genest known to me to be the person  described  and who  executed the  foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Cynthia R. Freedman
                                               ---------------------------------
                                               Notary Public

                                               October 20, 2000
                                               ---------------------------------
                                               My Comission expires:


                                  Page 33 of 38





     IN WITNESS  WHEREOF,  this Power of Attorney  has been signed as of the 3rd
day of February, 1997.

                                             /s/ Gregory M. Avis
                                             -----------------------------------
                                             Gregory M. Avis

    Sate of California              )
                                    ) ss:
    County of Santa Clara           )

    

     On this 3rd day of February,  1997,  before me  personally  came Gregory M.
Avis known to me  to be the person  described  and who  executed  the  foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Katherine C. Ely
                                               ---------------------------------
                                               Notary Public

                                               May 28, 2000
                                               ---------------------------------
                                               My Comission expires:


                                  Page 34 of 38





     IN WITNESS  WHEREOF,  this Power of Attorney has been signed as of the 10th
day of February, 1997.

                                             /s/ Ernest K. Jacquet
                                             -----------------------------------
                                             Ernest K. Jacquet
                                             
    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this 10th day of February,  1997,  before me  personally  came Ernest K.
Jacquet  known to me to be the person  described  and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Cynthia R. Freedman
                                               ---------------------------------
                                               Notary Public

                                               October 20, 2000
                                               ---------------------------------
                                               My Comission expires:

                                  Page 35 of 38






     IN WITNESS  WHEREOF,  this Power of Attorney has been signed as of the 10th
day of February, 1997.

                                             /s/ Thomas S. Roberts
                                             -----------------------------------
                                             Thomas S. Roberts

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this 10th day of February,  1997,  before me  personally  came Thomas S.
Roberts  known to me to be the person  described  and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Cynthia R. Freedman
                                               ---------------------------------
                                               Notary Public

                                               October 20, 2000
                                               ---------------------------------
                                               My Comission expires:

                                  Page 36 of 38





     IN WITNESS  WHEREOF,  this Power of Attorney has been signed as of the 10th
day of February, 1997.

                                             /s/ Bruce R. Evans
                                             -----------------------------------
                                             Bruce R. Evans

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this 10th day of  February,  1997,  before me  personally  came Bruce R.
Evans known to me to be the person  described  and who  executed  the  foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Cynthia R. Freedman
                                               ---------------------------------
                                               Notary Public

                                               October 20, 2000
                                               ---------------------------------
                                               My Comission expires:


                                  Page 37 of 38





     IN WITNESS  WHEREOF,  this Power of Attorney  has been signed as of the 3rd
day of February, 1997.

                                             /s/ Walter G. Kortschak
                                             -----------------------------------
                                             Walter G. Kortschak

    Sate of California              )
                                    ) ss:
    County of Santa Clara           )

    

     On this 3rd day of  February,  1997,  before me  personally  came Walter G.
Kortschak known to me to be the person  described and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               Katherine C. Ely
                                               ---------------------------------
                                               Notary Public

                                               May 28, 2000
                                               ---------------------------------
                                               My Comission expires:



                                  Page 38 of 38



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