DIGITAL GENERATION SYSTEMS INC
SC 13G/A, 1999-02-11
ADVERTISING AGENCIES
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13G
                                 (Rule 13d-102)

   INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b),
       (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b)
                               (Amendment No. 1)*
                                             ---

                        DIGITAL GENERATION SYSTEMS, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   253921 10 0
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                                December 31, 1998
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

         Check the  appropriate box to designate the rule pursuant to which this
Schedule is filed:

         [   ]   Rule 13d-1(b)
         [ X ]   Rule 13d-1(c)
         [   ]   Rule 13d-1(d)


*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
disclosures provided in a prior cover page.

         The information  required on 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).

                         (Continued on following pages)

                               Page 1 of 17 Pages

                       Exhibit Index Contained on Page 15


<PAGE>


<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  253921 10 0                                           13G        Page 2 of  17 Pages
- -----------------------------------------------------------                 --------------------------------------------------

- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     Integral Capital Management III, L.P. ("ICM3")

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

- ----------- ------------------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- ------------------------------------------------------------------------------------------------------------------
    4       CITIZENSHIP OR PLACE OF ORGANIZATION
                     Delaware (limited partnership)
- --------------------------------------- --------- ----------------------------------------------------------------------------
                                           5      SOLE VOTING POWER                   -0-
                                        --------- ----------------------------------------------------------------------------
                NUMBER                     6      SHARED VOTING POWER
                  OF                                       801,271 shares, of which 653,597 shares are directly owned by
                SHARES                                     Integral Capital Partners III, L.P. ("ICP3") and 147,674 shares
             BENEFICIALLY                                  are directly owned by Integral Capital Partners International
            OWNED BY EACH                                  III, L.P. ("ICPI3"). ICM3 is the general partner of ICP3 and the
              REPORTING                                    investment general partner of ICPI3.
                PERSON
                 WITH
                                        --------- ----------------------------------------------------------------------------
                                           7      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           8      SHARED DISPOSITIVE POWER
                                                           801,271  shares  (see response to Item 6)
- ----------- ------------------------------------------------------------------------------------------------------------------
    9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              801,271 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES*
                                                                                                                         [ ]

- ----------- ------------------------------------------------------------------------------------------------------------------
    11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                                              3.1%
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  253921 10 0                                           13G        Page 3 of  17 Pages
- -----------------------------------------------------------                 --------------------------------------------------

- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     Integral Capital Management IV, LLC ("ICM4")

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

- ----------- ------------------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- ------------------------------------------------------------------------------------------------------------------
    4       CITIZENSHIP  OR PLACE  OF  ORGANIZATION
                     Delaware  (limited liability company)
- --------------------------------------- --------- ----------------------------------------------------------------------------
                                           5      SOLE VOTING POWER                   -0-
                                        --------- ----------------------------------------------------------------------------
                NUMBER                     6      SHARED VOTING POWER
                  OF                                       670,751 shares, which shares are directly owned by Integral
                SHARES                                     Capital Partners IV, L.P. ("ICP4").  ICM4 is the general partner
             BENEFICIALLY                                  of ICP4
            OWNED BY EACH
              REPORTING
                PERSON
                 WITH
                                        --------- ----------------------------------------------------------------------------
                                           7      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           8      SHARED DISPOSITIVE POWER
                                                           670,751  shares  (see response to Item 6)
- ----------- ------------------------------------------------------------------------------------------------------------------
    9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              670,751 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES*
                                                                                                                         [ ]

- ----------- ------------------------------------------------------------------------------------------------------------------
    11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                                              2.6%
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      TYPE OF REPORTING PERSON*                                                                                      OO
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  253921 10 0                                           13G        Page 4 of  17 Pages
- -----------------------------------------------------------                 --------------------------------------------------

- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     ICP MS Management, LLC ("ICP Management")

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

- ----------- ------------------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- ------------------------------------------------------------------------------------------------------------------
    4       CITIZENSHIP  OR PLACE  OF  ORGANIZATION
                     Delaware  (limited liability company)
- --------------------------------------- --------- ----------------------------------------------------------------------------
                                           5      SOLE VOTING POWER                   -0-
                                        --------- ----------------------------------------------------------------------------
                NUMBER                     6      SHARED VOTING POWER
                  OF                                       3,426 shares, which shares are directly owned by Integral Capital
                SHARES                                     Partners IV MS Side Fund, L.P. ("Side Fund").  ICP Management is
             BENEFICIALLY                                  the general partner of Side Fund
            OWNED BY EACH
              REPORTING
                PERSON
                 WITH
                                        --------- ----------------------------------------------------------------------------
                                           7      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           8      SHARED DISPOSITIVE POWER
                                                           3,426   shares   (see response to Item 6)
- ----------- ------------------------------------------------------------------------------------------------------------------
    9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                                3,426 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES*
                                                                                                                         [ ]

- ----------- ------------------------------------------------------------------------------------------------------------------
    11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                                             0.01%
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      TYPE OF REPORTING PERSON*                                                                                      OO
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  253921 10 0                                           13G        Page 5 of  17 Pages
- -----------------------------------------------------------                 --------------------------------------------------

- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     Integral Capital Partners III, L.P. ("ICP3")

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

- ----------- ------------------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- ------------------------------------------------------------------------------------------------------------------
    4       CITIZENSHIP OR PLACE OF ORGANIZATION
                     Delaware (limited partnership)
- --------------------------------------- --------- ----------------------------------------------------------------------------
                                           5      SOLE VOTING POWER                   -0-
                                        --------- ----------------------------------------------------------------------------
                NUMBER                     6      SHARED VOTING POWER
                  OF                                       653,597 shares are directly owned by ICP3.  Integral Capital
                SHARES                                     Management III, L.P. is the general partner of ICP3.
             BENEFICIALLY
            OWNED BY EACH
              REPORTING
                PERSON
                 WITH
                                        --------- ----------------------------------------------------------------------------
                                           7      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           8      SHARED DISPOSITIVE POWER
                                                           653,597  shares  (see response to Item 6)
- ----------- ------------------------------------------------------------------------------------------------------------------
    9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              653,597 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES*
                                                                                                                         [ ]

- ----------- ------------------------------------------------------------------------------------------------------------------
    11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                                              2.5%
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  253921 10 0                                           13G        Page 6 of  17 Pages
- -----------------------------------------------------------                 --------------------------------------------------

- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     Integral Capital Partners International III, L.P. ("ICPI3")

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

- ----------- ------------------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- ------------------------------------------------------------------------------------------------------------------
    4       CITIZENSHIP  OR  PLACE  OF   ORGANIZATION
                     Cayman  Islands (limited partnership)
- --------------------------------------- --------- ----------------------------------------------------------------------------
                                           5      SOLE VOTING POWER                   -0-
                                        --------- ----------------------------------------------------------------------------
                NUMBER                     6      SHARED VOTING POWER
                  OF                                       147,674 shares are directly owned by ICPI3.  Integral Capital
                SHARES                                     Management III, L.P. is the investment general partner of ICPI3.
             BENEFICIALLY
            OWNED BY EACH
              REPORTING
                PERSON
                 WITH
                                        --------- ----------------------------------------------------------------------------
                                           7      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           8      SHARED DISPOSITIVE POWER
                                                           147,674  shares  (see response to Item 6)
- ----------- ------------------------------------------------------------------------------------------------------------------
    9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              147,674 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES*
                                                                                                                         [ ]

- ----------- ------------------------------------------------------------------------------------------------------------------
    11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                                              0.6%
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  253921 10 0                                           13G        Page 7 of  17 Pages
- -----------------------------------------------------------                 --------------------------------------------------

- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     Integral Capital Partners IV, L.P. ("ICP4")

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

- ----------- ------------------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- ------------------------------------------------------------------------------------------------------------------
    4       CITIZENSHIP OR PLACE OF ORGANIZATION
                     Delaware (limited partnership)
- --------------------------------------- --------- ----------------------------------------------------------------------------
                                           5      SOLE VOTING POWER                   -0-
                                        --------- ----------------------------------------------------------------------------
                NUMBER                     6      SHARED VOTING POWER
                  OF                                       670,751 shares are directly owned by ICP4.  Integral Capital
                SHARES                                     Management IV, LLC is the general partner of ICP4.
             BENEFICIALLY
            OWNED BY EACH
              REPORTING
                PERSON
                 WITH
                                        --------- ----------------------------------------------------------------------------
                                           7      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           8      SHARED DISPOSITIVE POWER
                                                           670,751  shares  (see response to Item 6)
- ----------- ------------------------------------------------------------------------------------------------------------------
    9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              670,751 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES*
                                                                                                                         [ ]

- ----------- ------------------------------------------------------------------------------------------------------------------
    11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                                              2.6%
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  253921 10 0                                           13G        Page 8 of  17 Pages
- -----------------------------------------------------------                 --------------------------------------------------

- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     Integral Capital Partners IV MS Side Fund, L.P. ("Side Fund")

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

- ----------- ------------------------------------------------------------------------------------------------------------------
    3       SEC USE ONLY
- ----------- ------------------------------------------------------------------------------------------------------------------
    4       CITIZENSHIP OR PLACE OF ORGANIZATION
                     Delaware (limited partnership)
- --------------------------------------- --------- ----------------------------------------------------------------------------
                                           5      SOLE VOTING POWER                   -0-
                                        --------- ----------------------------------------------------------------------------
                NUMBER                     6      SHARED VOTING POWER
                  OF                                       3,426  shares  are  directly  owned by Side  Fund.  ICP MS
                SHARES                                     Management, LLC is the investment general partner of Side Fund.
             BENEFICIALLY
            OWNED BY EACH
              REPORTING
                PERSON
                 WITH
                                        --------- ----------------------------------------------------------------------------
                                           7      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           8      SHARED DISPOSITIVE POWER
                                                           3,426   shares   (see response to Item 6)
- ----------- ------------------------------------------------------------------------------------------------------------------
    9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                                3,426 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES*

- ----------- ------------------------------------------------------------------------------------------------------------------
    11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                                             0.01%
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


                                                                    Page 9 of 17


ITEM 1(a).        NAME OF ISSUER:

                  Digital Generation Systems, Inc.

ITEM 1(b).        ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

                  875 Battery Street, 2nd Floor
                  San Francisco, CA  94111

ITEM 2(a), (b), (c).       NAME OF PERSON FILING, ADDRESS OF PRINCIPAL BUSINESS
                           OFFICE OR, IF NONE, RESIDENCE, AND CITIZENSHIP:

                  This statement is being filed by Integral  Capital  Management
III, L.P., a Delaware limited partnership ("ICM3"),  Integral Capital Management
IV, LLC, a Delaware  limited  liability  company ("ICM4") and ICP MS Management,
LLC, a Delaware  limited  liability  company ("ICP  Management").  The principal
business  address of ICM3, ICM4 and ICP Management is 2750 Sand Hill Road, Menlo
Park, California 94025.

                  ICM3 is the general partner of Integral  Capital Partners III,
L.P.,  a Delaware  limited  partnership  ("ICP3"),  and the  investment  general
partner of Integral Capital Partners  International  III, L.P., a Cayman Islands
exempted limited partnership ("ICPI3").  ICM4 is the general partner of Integral
Capital  Partners  IV,  L.P.,  a  Delaware  limited  partnership  ("ICP4").  ICP
Management is the general partner of Integral  Capital Partners IV MS Side Fund,
L.P., a Delaware limited  partnership ("Side Fund").  With respect to ICM3, ICM4
and ICP  Management,  this  statement  relates  only to  ICM3's,  ICM4's and ICP
Management's  indirect,  beneficial  ownership  of shares of Common Stock of the
Issuer (the "Shares").  The Shares have been purchased by ICP3, ICPI3, ICP4, and
Side Fund, and none of ICM3, ICM4, or ICP Management  directly or otherwise hold
any Shares. Management of the business affairs of ICM3, ICM4 and ICP Management,
including decisions respecting  disposition and/or voting of the Shares, resides
in a  majority  of the  general  partners  or  managers  of ICM3,  ICM 4 and ICP
Management,  respectively  such that no single general  partner of ICM3, ICM4 or
ICP Management has voting and/or dispositive power of the Shares.

ITEM 2(d).        TITLE OF CLASS OF SECURITIES:

                  Common Stock

ITEM 2(e).        CUSIP NUMBER:

                  253921100


<PAGE>


                                                                   Page 10 of 17
<TABLE>

<CAPTION>
ITEM 3. IF THIS  STATEMENT IS FILED  PURSUANT TO RULE  13d-1(b),  or 13d-2(b) or
(c), CHECK WHETHER THE PERSON FILING IS A:

<S>               <C>      <C>
         (a)      [    ]   Broker or dealer registered under Section 15 of the Exchange Act.
         (b)      [    ]   Bank as defined in Section 3(a)(6) of the Exchange Act.
         (c)      [    ]   Insurance company as defined in Section 3(a)(19) of the Exchange Act.
         (d)      [    ]   Investment company registered under Section 8 of the Investment
                           Company Act.
         (e)      [    ]   An   investment   adviser   in   accordance   with   Rule
                           13d-1(b)(1)(ii)(E);
         (f)      [    ]   An employee benefit plan or endowment fund in accordance with Rule
                           13d-1(b)(1)(ii)(F);
         (g)      [    ]   A parent holding company or control person in accordance with Rule
                           13d-1(b)(1)(ii)(G);
         (h)      [    ]   A savings  association as defined in Section 3(b)
                           of the Federal Deposit Insurance Act;
         (i)      [    ]   A  church  plan  that  is  excluded   from  the
                           definition  of an  investment  company  under Section
                           3(c)(14) of the Investment Company Act;
         (j)      [    ]   Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

         If this statement is filed pursuant to Rule 13d-1(c), check this box.
[ X ].

ITEM 4.  OWNERSHIP.

         Provide the following  information  regarding the aggregate  number and
percentage of the class of securities of the issuer identified in Item 1.

A.       Integral Capital Management III, L.P. ("ICM3")

                  (a)      Amount Beneficially Owned:  801,271
                  (b)      Percent of Class: 3.1%
                  (c)      Number of shares as to which such person has:
                           1.    Sole power to vote or to direct vote:  -0-
                           2.    Shared power to vote or to direct vote: 801,271
                           3.    Sole power to dispose or to direct the disposition:  -0-
                           4.    Shared power to dispose or to direct the disposition: 801,271

         B.       Integral Capital Management IV, LLC ("ICM4")

                  (a)      Amount Beneficially Owned:  670,751
                  (b)      Percent of Class: 2.6%
                  (c)      Number of shares as to which such person has:
                           1.    Sole power to vote or to direct vote:  -0-
                           2.    Shared power to vote or to direct vote: 670,751
                           3.    Sole power to dispose or to direct the disposition:  -0-
                           4.    Shared power to dispose or to direct the disposition: 670,751


<PAGE>


                                                                   Page 11 of 17

         C.       ICP MS Management, LLC ("ICP Management")

                  (a)      Amount Beneficially Owned:  3,426
                  (b)      Percent of Class:  0.01%
                  (c)      Number of shares as to which such person has:
                           1.    Sole power to vote or to direct vote:  -0-
                           2.    Shared power to vote or to direct vote:  3,426
                           3.    Sole power to dispose or to direct the disposition:  -0-
                           4.    Shared power to dispose or to direct the disposition:  3,426

         D.       Integral Capital Partners III, L.P.

                  (a)      Amount Beneficially Owned:  653,597
                  (b)      Percent of Class:  2.5%
                  (c)      Number of shares as to which such person has:
                           1.    Sole power to vote or to direct vote:  -0-
                           2.    Shared power to vote or to direct vote: 653,597
                           3.    Sole power to dispose or to direct the disposition:  -0-
                           4.    Shared power to dispose or to direct the disposition: 653,597

         E.       Integral Capital Partners International III, L.P.

                  (a)      Amount Beneficially Owned:  147,674
                  (b)      Percent of Class: 0.6%
                  (c)      Number of shares as to which such person has:
                           1.    Sole power to vote or to direct vote:  -0-
                           2.    Shared power to vote or to direct vote: 147,674
                           3.    Sole power to dispose or to direct the disposition:  -0-
                           4.    Shared power to dispose or to direct the disposition: 147,674

         F.       Integral Capital Partners IV, L.P. 

                  (a)      Amount Beneficially Owned:  670,751
                  (b)      Percent of Class: 2.6%
                  (c)      Number of shares as to which such person has:
                           1.    Sole power to vote or to direct vote:  -0-
                           2.    Shared power to vote or to direct vote: 670,751
                           3.    Sole power to dispose or to direct the disposition:  -0-
                           4.    Shared power to dispose or to direct the disposition: 670,751

         G.       Integral Capital Partners IV MS Side Fund, L.P.

                  (a)      Amount Beneficially Owned:  3,426
                  (b)      Percent of Class:  0.01%
                  (c)      Number of shares as to which such person has:
                           1.    Sole power to vote or to direct vote:  -0-
                           2.    Shared power to vote or to direct vote: 3,426
                           3.    Sole power to dispose or to direct the disposition:  -0-
                           4.    Shared power to dispose or to direct the disposition: 3,426
</TABLE>


<PAGE>


                                                                  Page 12 of  17

ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

         If this statement is being filed to report the fact that as of the date
hereof the reporting  person has ceased to be the beneficial  owner of more than
five percent of the class of securities, check the following [ ].

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 CLASSIFCATION OF MEMBERS OF THE GROUP.

         Not applicable.

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP.

         Not applicable.

ITEM 10. CERTIFICATION.

         By  signing  below I  certify  that,  to the best of my  knowledge  and
belief, the securities  referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing  the control of the
issuer of the  securities  and were not acquired and are not held in  connection
with or as a participant in any transaction having that purpose or effect.

                                    SIGNATURE

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

Dated:  February 11, 1999

                                       INTEGRAL CAPITAL MANAGEMENT III, L.P.


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a General Partner



<PAGE>


                                                                Page 13 of 17

                                       INTEGRAL CAPITAL MANAGEMENT IV, LLC


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a Manager


                                       ICP MS MANAGEMENT, LLC


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a Manager


                                       INTEGRAL CAPITAL PARTNERS III, L.P.

                                       By Integral Capital Management III, L.P.,
                                       its General Partner


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a General Partner


                                       INTEGRAL CAPITAL PARTNERS INTERNATIONAL
                                       III, L.P.

                                       By Integral Capital Management III, L.P.,
                                       its Investment General Partner


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a General Partner


                                       INTEGRAL CAPITAL PARTNERS IV, L.P.

                                       By Integral Capital Management IV, LLC,
                                       its General Partner


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a Manager


<PAGE>


                                                                   Page 14 of 17



                                      INTEGRAL CAPITAL PARTNERS IV MS SIDE FUND,
                                      L.P.

                                      By ICP MS Management, LLC,
                                      its General Partner


                                      By         /s/ Pamela K. Hagenah
                                        ------------------------------------
                                                 Pamela K. Hagenah
                                                 a Manager


<PAGE>


                                                                   Page 15 of 17


                                  EXHIBIT INDEX


                                                                   Found on
                                                                   Sequentially
Exhibit                                                            Numbered Page
- -------                                                            -------------

Exhibit A:        Agreement of Joint Filing                             16


<PAGE>


                                                                   Page 16 of 17


                                    EXHIBIT A

                            Agreement of Joint Filing


                  The  undersigned  hereby  agree that they are  filing  jointly
pursuant to Rule  13d-1(k)(1)  of the Act the statement  dated February 11, 1999
containing the information required by Schedule 13G, for the 1,475,448 Shares of
capital  stock of Digital  Generation  Systems,  Inc.  held by Integral  Capital
Partners III, L.P., a Delaware  limited  partnership,  Integral Capital Partners
International III, L.P., a Cayman Islands exempted limited partnership, Integral
Capital Partners IV, L.P., a Delaware limited partnership,  and Integral Capital
Partners IV MS Side Fund, L.P., a Delaware limited partnership.

Date:  February 11, 1999
                                       INTEGRAL CAPITAL MANAGEMENT III, L.P.


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a General Partner


                                       INTEGRAL CAPITAL MANAGEMENT IV, LLC


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a Manager


                                       ICP MS MANAGEMENT, LLC


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a Manager


                                       INTEGRAL CAPITAL PARTNERS III, L.P.

                                       By Integral Capital Management III, L.P.,
                                       its General Partner


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a General Partner

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                                       INTEGRAL CAPITAL PARTNERS INTERNATIONAL
                                       III, L.P.

                                       By Integral Capital Management III, L.P.,
                                       its Investment General Partner


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a General Partner


                                       INTEGRAL CAPITAL PARTNERS IV, L.P.

                                       By Integral Capital Management IV, LLC,
                                       its General Partner


                                       By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                  Pamela K. Hagenah
                                                  a Manager


                                      INTEGRAL CAPITAL PARTNERS IV MS SIDE FUND,
                                      L.P.

                                      By ICP MS Management, LLC,
                                      its General Partner


                                      By         /s/ Pamela K. Hagenah
                                         ------------------------------------
                                                 Pamela K. Hagenah
                                                 a Manager




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