BANKAMERICA CORP
SC 13D/A, 1997-10-14
NATIONAL COMMERCIAL BANKS
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<PAGE>
 
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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                 SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 5)*


                           Giga-Tronics Incorporated
    ----------------------------------------------------------------------
                                Name of Issuer

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

                                   375175106
    ----------------------------------------------------------------------
                                 CUSIP Number

            Cheryl Sorokin, Executive Vice President and Secretary
         BankAmerica Corporation, Corporate Secretary's Office #13018
                555 California Street, San Francisco, CA  94104
                                (415) 622-3530
    ----------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
Communications

                                October 1, 1997
    ----------------------------------------------------------------------
             Date of Event which Requires Filing of this Statement

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following box if a fee is being paid with the statement   [ ].  (A fee
is not required only if the reporting person: (1) has a previous statement on
file reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class).
(See Rule 13d-7.)

Note:  Six copies of this statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.

*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).
<PAGE>
 

- -----------------------                                  ---------------------
  CUSIP NO. 375175106          SCHEDULE 13D                PAGE 2 OF 13 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      The Robertson Stephens Orphan Fund

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*                    
 4    
      WC          

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
      ITEMS 2(d) or 2(e)
 5    
                                                                    [_]

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      CALIFORNIA

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7   
     NUMBER OF            0        
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          249,672 
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9    
    REPORTING             0             
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          249,672
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 11 
      249,672            

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      6.6%       

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      PN   

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

*SEE INSTRUCTION BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE,
RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
ATTESTATION


<PAGE>
 
 

- -----------------------                                  ---------------------
  CUSIP NO. 375175106          SCHEDULE 13D                PAGE 3 OF 13 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Bayview Investors, Ltd.           

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*                    
 4    
      OO          

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
      ITEMS 2(d) or 2(e)
 5    
                                                                    [_]

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      CALIFORNIA

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7   
     NUMBER OF            0        
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          249,672 shares (Includes shares held by The Robertson
                          Stephens Orphan Fund of which Robertson, Stephens &
                          Company Investment Management, L.P. and Bayview
                          Investors, Ltd. are the general partner, See Item
                          5.)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9    
    REPORTING             0             
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          249,672
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11 
      249,672            

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      6.6%       

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      PN   

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

*SEE INSTRUCTION BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE,
RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
ATTESTATION



<PAGE>
 
 

- -----------------------                                  ---------------------
  CUSIP NO. 375175106          SCHEDULE 13D                PAGE 4 OF 13 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Robertson, Stephens & Company Investment Management, L.P.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*                    
 4    
      OO          

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
      ITEMS 2(d) or 2(e)
 5    
                                                                    [_]

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      CALIFORNIA

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7   
     NUMBER OF            0        
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          296,672 shares (Includes shares held by The Robertson
                          Stephens Orphan Fund of which Robertson, Stephens &
                          Company Investment Management, L.P. and Bayview
                          Investors, Ltd. are the general partners. Includes
                          shares held by The Robertson Stephens Orphan Offshore
                          Fund, L.P. of which Robertson, Stephens & Company
                          Investment Management, L.P. is the general partner,
                          See Item 5.)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9    
    REPORTING             0             
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          296,672
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11 
      296,672            

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      7.8%       

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      IA   

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

*SEE INSTRUCTION BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE,
RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
ATTESTATION



<PAGE>
 
 

- -----------------------                                  ---------------------
  CUSIP NO. 375175106          SCHEDULE 13D                PAGE 5 OF 13 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Bayview Holdings, Inc.             

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*                    
 4    
      OO          

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
      ITEMS 2(d) or 2(e)
 5    
                                                                    [_]

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      DELAWARE  

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7   
     NUMBER OF            0        
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          296,672 shares (Includes shares held by The Robertson
                          Stephens Orphan Fund of which Robertson, Stephens &
                          Company Investment Management, L.P. and Bayview
                          Investors, Ltd. are the general partners. Bayview
                          Holdings, Inc. is managing member of Roberson,
                          Stephens & Company Private Equity Group, L.L.C. which
                          is general partner of Bayview Investors, Ltd. Includes
                          shares held by The Robertson Stephens Orphan Offshore
                          Fund, L.P. of which Robertson, Stephens & Company
                          Investment Management, L.P. is the general partner.
                          Bayview Holdings is general partner of Robertson,
                          Stephens & Company Investment Management, L.P. See
                          Item 5.)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9    
    REPORTING             0             
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          296,672  
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11 
      296,672            

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      7.8%       

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO   

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

*SEE INSTRUCTION BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE,
RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
ATTESTATION
<PAGE>
 

- -----------------------                                  ---------------------
  CUSIP NO. 375175106          SCHEDULE 13D                PAGE 6 OF 13 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      BankAmerica Corporation               

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*                    
 4    
      OO          

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
      ITEMS 2(d) or 2(e)
 5    
                                                                    [_]

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      DELAWARE  

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7   
     NUMBER OF            0        
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          296,672 shares (includes shares held by The Robertson
                          Stephens Orphan Fund of which Robertson, Stephens &
                          Company Investment Management, L.P. and Bayview
                          Investors, Ltd. are the general partners. Bayview
                          Holdings, Inc. is managing member of Robertson,
                          Stephens & Company Private Equity Group, L.L.C. which
                          is general partner of Bayview Investors, Ltd. Includes
                          shares held by The Robertson Stephens Orphan Offshore
                          Fund, L.P. of which Robertson, Stephens & Company
                          Investment Management, L.P. is the general partner.
                          BankAmerica Corporation owns Robertson Stephens
                          Investment Management Co. which owns Bayview Holdings,
                          Inc. Bayview Holdings, Inc. is general partner of
                          Robertson, Stephens & Company Investment Management,
                          L.P. See Item 5.)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9    
    REPORTING             0             
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          296,672
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 11 
      296,672            

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      7.8%       

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO   

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

*SEE INSTRUCTION BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE,
RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
ATTESTATION
<PAGE>
 
 

- -----------------------                                  ---------------------
  CUSIP NO. 375175106          SCHEDULE 13D                PAGE 7 OF 13 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Robertson Stephen Investment Management Co.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*                    
 4    
      OO          

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
      ITEMS 2(d) or 2(e)
 5    
                                                                    [_]

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      DELAWARE   

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7   
     NUMBER OF            0        
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          296,672 shares (includes shares held by The Robertson
                          Stephens Orphan Fund of which Robertson, Stephens &
                          Company Investment Management, L.P. and Bayview
                          Investors, Ltd. are the general partners, Bayview
                          Holdings, Inc. is managing member of Robertson,
                          Stephens & Company Private Equity Group, L.L.C which
                          is general partner of Bayview Investors, Ltd. Includes
                          shares held by The Robertson Stephens Orphan Offshore
                          Fund L.P. of which Robertson, Stephens & Company
                          Investment Management, L.P. is the general partner.
                          Robertson Stephens Investment Management Co. owns
                          Bayview Holdings, Inc. which is general partner of
                          Robertson, Stephens & Company Investment Management,
                          L.P. See Item 5.)
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9    
    REPORTING             0             
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          296,672
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11 
      296,672            

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      7.8%       

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO   

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

*SEE INSTRUCTION BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE,
RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
ATTESTATION
<PAGE>
 
 

- -----------------------                                  ---------------------
  CUSIP NO. 375175106          SCHEDULE 13D                PAGE 8 OF 13 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Robertson, Stephens & Company Private Equity Group, L.L.C.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*                    
 4    
      WC          

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
      ITEMS 2(d) or 2(e)
 5    
                                                                    [_]

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      DELAWARE        

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7   
     NUMBER OF            0        
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          249,672 shares (Includes 249,672 shares held by The
                          Robertson Stephens Orphan Fund of which Robertson,
                          Stephens & Company Investment Management, L.P. and
                          Bayview Investors, Ltd. are general partners.
                          Robertson, Stephens & Company Private Equity Group,
                          L.L.C. is general partner of Bayview Investors, Ltd.
                          Bayview Holdings, Inc. is managing member of
                          Robertson, Stephens & Company Private Equity Group,
                          L.L.C.
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9    
    REPORTING             0             
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          249,672
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 11 
      249,672            

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      6.6%       

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      OO   

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

*SEE INSTRUCTION BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE,
RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
ATTESTATION



<PAGE>
 
CUSIP No. 375175106                                                Page 9 of 14

Item 1.     Security and Issuer.
            -------------------

          This Amended Schedule 13D is filed with respect to the Common Stock of
Giga-Tronics, Incorporated (the "Company"), 4650 Norris Canyon Road, San Ramon,
California 94583.

Item 2:     Identity and Background.
            -----------------------

          The Amended Schedule 13D is filed on behalf of The Robertson Stephens
Orphan Fund ("Orphan"), Robertson, Stephens & Company Investment Management,
L.P. ("Investment Adviser"), Bayview Investors, Ltd. ("Bayview"), Bayview
Holdings Inc. ("Bayview Holdings"), Robertson, Stephens & Company Private Equity
Group, L.L.C. ("Private Equity Group"), BankAmerica Corporation ("Bank"), and
Robertson Stephens Investment Management Co. ("Robertson Parent") collectively
known as the Filing Parties.

          This Amended Schedule 13D relates to the direct beneficial ownership
in the shares of the Company by Orphan and The Robertson Stephens Orphan
Offshore Fund, L.P. ("Orphan Offshore") (the "Funds"), and the indirect
beneficial ownership of Investment Adviser, Bayview, Bayview Holdings, Private
Equity Group, Bank and Robertson Parent in the shares of the Company held by the
Funds.


I.          (a)   Orphan is a California limited partnership.  Investment
                  Adviser and Bayview are the general partners.
 
            (b)   555 California Street, Suite 2600
                  San Francisco, CA  94104
                  (principal office and principal place of business)

            (c)   investments in securities
 

II          (a)   Orphan Offshore is a Cayman Islands limited partnership.
                  Investment Adviser is the general partner.
 
            (b)   555 California Street, Suite 2600
                  San Francisco, CA  94104
                  (principal office and principal place of business)
 
            (c)   investment in securities
 

III.        (a)   Bayview is a California limited partnership and general
                  partner of Orphan.
 
            (b)   555 California Street, Suite 2600
                  San Francisco, CA  94104
                  (principal office and principal place of business)
 
            (c)   investments in securities
 
<PAGE>
 
CUSIP No. 375175106                                                Page 10 of 14

IV.         (a)   Bayview Holdings is a Delaware corporation. Bayview Holdings,
                  a subsidiary of Robertson Parent, is the general partner of
                  Investment Adviser.

            (b)   555 California Street, Suite 2600
                  San Francisco, CA  94104
                  (principal office and principal place of business)

            (c)   holding company
 

V.          (a)   Investment Adviser is a California limited partnership. It is
                  general partner to Orphan and Orphan Offshore.

            (b)   555 California Street, Suite 2600
                  San Francisco, CA  94104
                  (principal office and principal place of business)

            (c)   registered investment advisor


VI.         (a)   Bank is a Delaware corporation.  It wholly owns Robertson
                  Parent.

            (b)   Corporate Secretary's Office #13018
                  555 California Street
                  San Francisco, CA  94104
                  (principal office and principal place of business)

            (c)   bank holding company


VII.        (a)   Robertson Parent is a Delaware corporation. It is owned by
                  Bank. It owns Bayview Holdings.

            (b)   Corporate Secretary's Office #13018
                  555 California Street
                  San Francisco, CA  94104
                  (principal office and principal place of business)

            (c)   holding company


VIII.       (a)   Private Equity Group is a Delaware limited liability company.
                  It is general partner of Bayview. Bayview Holdings is managing
                  member of Private Equity Group.

            (b)   555 California Street, Suite 2600
                  San Francisco, CA  94104

            (c)   holding company

          Certain information regarding the directors and executive officers of
the Filing Parties is set forth in Exhibit B attached hereto.
<PAGE>
 
CUSIP No. 375175106                                                Page 11 of 14

          During the last five years, neither the entities mentioned above, nor,
to their best knowledge, any person named in Exhibit B attached hereto, has been
(a) convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors) or (b) a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction and as a result of such proceeding
was or is subject to a judgment, decree or final order enjoining future
violations of, or prohibiting or mandating activities subject to federal or
state securities laws or finding any violation with respect to such laws.

          Bank incorporates by reference the material under Item 3, "Legal
Proceedings," in its Annual Report on Form 10-K for the year ended December 31,
1996, and the material in its Current Report on Form 8-K for May 5, 1997 (File
No. 1-7377).


Item 3:     Source and Amount of Funds or Other Consideration:
            -------------------------------------------------

          The securities with respect to which this Amended Schedule 13D is
filed were purchased by the Funds using working capital contributed by their
respective partners and shareholders.

Item 4:     Purpose of Transaction:
            ----------------------

          This filing is being made to report the beneficial ownership of
securities held by Robertson Stephens which may be imputed and certain of its
subsidiaries to Bank due to Bank's recent acquisition of that company.  The
filing of this statement shall not be construed as an admission that Bank,
Bayview Holdings or Robertson Parent is, for the purposes of Section 13(d), or
13(g) of the Securities Exchange Act of 1934, as amended, the beneficial owner
of any securities covered by this statement.

          The securities were purchased by the Funds in the ordinary course of
business and not with the intention nor effect of changing or influencing
control of the Company.  The reporting persons may sell all or part or acquire
additional securities of the Company depending on market conditions and other
economic factors.
<PAGE>
 
CUSIP No. 375175106                                              Page 12 of 14
    

Item 5:     Interest in Securities of the Issuer.
            ------------------------------------

          (a) (b)  The aggregate number and percentage of the class of
securities identified pursuant to Item 1 of this Amended Schedule 13D that are
beneficially owned by the persons listed in Item 2 are as follows:
<TABLE>
<CAPTION>
 
                           No. of Shares
Name of                   Beneficially    Percentage of
Beneficial Owner (1)         Owned             Class
- -------------------------------------------------------
<S>                       <C>            <C>
 
Orphan                     249,672             6.6%
Orphan Offshore             47,000             1.2%
Investment Adviser         296,672             7.8%
Bayview                    249,672             6.6%
Bayview Holdings           296,672             7.8%
Bank                       296,672             7.8%
Robertson Parent           296,672             7.8%
Private Equity Group       249,672             6.6%
 
</TABLE>
(1)  As reflected in the cover pages, which are incorporated by reference,
     certain of the reporting parties may be deemed to have beneficial ownership
     of holdings of the Funds due to their management of portfolio investments
     for the Funds, or due to their ownership of entities which provide such
     management.


Item 6.     Contracts, Arrangements, Understandings or Relationships with
            -------------------------------------------------------------
            Respect to Securities of the Issuer.
            -----------------------------------

            See Item 5.

Item 7.     Material to Be Filed as Exhibits.
            --------------------------------
            Exhibit A  -   Joint Filing Agreement
            Exhibit B  -   Directors and Executive Officers (or persons
                           serving in similar capacities) of the Filing Parties
 
<PAGE>
 
CUSIP No. 375175106                                                Page 13 of 14

Item 8.     Signature page.
            --------------

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

Dated:      October 10, 1997

            THE ROBERTSON STEPHENS ORPHAN FUND, A CALIFORNIA LIMITED
            PARTNERSHIP*
 
            BAYVIEW INVESTORS, LTD., A CALIFORNIA LIMITED PARTNERSHIP*
 
            ROBERTSON, STEPHENS & COMPANY INVESTMENT MANAGEMENT, L.P., A
            CALIFORNIA LIMITED PARTNERSHIP*

            Robertson, Stephens & Company Private Equity Group, L.L.C.*
 
            BAYVIEW HOLDINGS, INC.*

            BANKAMERICA CORPORATION*

            ROBERTSON STEPHENS INVESTMENT MANAGEMENT CO.*


*By:        /s/  JEFFREY R. LAPIC

            Jeffrey R. Lapic
            Assistant General Counsel of
            Bank of America National Trust and Savings Association
            and Authorized Attorney-in-Fact
<PAGE>
 
CUSIP No. 375175106                                                Page 14 of 14

                                   EXHIBIT A
                                   ---------

                            Joint Filing Agreement
                            ----------------------

     The undersigned hereby agree that they are filing this statement jointly
pursuant to Rule 13d-1(f)(1).  Each of them is responsible for the timely filing
of such Schedule 13D and any amendments thereto, and for the completeness and
accuracy of the information concerning such person contained therein; but none
of them is responsible for the completeness or accuracy of the information
concerning the other persons making the filing, unless such person knows or has
reason to believe that such information is inaccurate.

Date:  October 10, 1997

            THE ROBERTSON STEPHENS ORPHAN FUND, A CALIFORNIA LIMITED
            PARTNERSHIP*
 
            BAYVIEW INVESTORS, LTD., A CALIFORNIA LIMITED PARTNERSHIP*
 
            ROBERTSON, STEPHENS & COMPANY INVESTMENT MANAGEMENT, L.P., A
            CALIFORNIA LIMITED PARTNERSHIP*

            ROBERTSON, STEPHENS & COMPANY PRIVATE EQUITY GROUP, L.L.C.*

            BAYVIEW HOLDINGS, INC.*

            BANKAMERICA CORPORATION*

            ROBERTSON STEPHENS INVESTMENT MANAGEMENT CO.*



*By:        /s/  JEFFREY R. LAPIC

            Jeffrey R. Lapic
            Assistant General Counsel of
            Bank of America National Trust and Savings Association
            and Authorized Attorney-in-Fact

<PAGE>
 
                                   EXHIBIT B

             Directors and Executive Officers of Reporting Parties



                            BankAmerica Corporation
 
     The following table sets forth information regarding the executive officers
and directors of BankAmerica Corporation (directors are indicated by asterisk),
all of whom are U.S. citizens and none of whom owns Common Stock of Forstmann &
Company, Inc.

<TABLE>
<CAPTION>

<S>                      <C>                            <C>                                                                    
*Joseph F.               1955 North Surveyor Ave.       Chairman of the Board and CEO                                           
 Alibrandi               Simi Valley, CA  93063         Whittaker Corporation                                                   
                                                        (principal business: aerospace manufacturing)                           
                                                                                                                                
*Peter B.                270 Lafayette Circle           Chairman of the Board and                                               
 Bedford                 Lafayette, CA  94549           Chief Executive Officer                                                 
                                                        Bedford Property Investors, Inc.                                        
                                                        (principal business: real estate investment trust)                      
                                                                                                                                
 Kathleen J.             555 California Street          Vice Chairman and Personnel Relations Officer                           
 Burke                   San Francisco, CA  94104       Bank of America NT&SA                                                   
                                                        (principal business: banking and finance)                               
                                                                                                                                
*Richard A.              123 Mission St.                Retired                                                                 
 Clarke                  San Francisco, CA  94106                                                                               
                                                                                                                                
*David A.                555 California Street          Chairman of the Board, President                                        
 Coulter                 San Francisco, CA  94104       and Chief Executive Officer                                             
                                                        Bank of America NT&SA                                                   
                                                        (principal business: banking and finance)                               
                                                                                                                                
*Timm F.                 c/o Hallmark Cards, Inc.       Retired                                                                 
 Crull                   1024 E. Balboa Blvd.                                                                                   
                         Newport Beach, CA  92661                                                                               
                                                                                                                                
*Kathleen                147 Clifton Street             President                                                                
 Feldstein               Belmont, MA  02178             Economics Studies, Inc.                                                  
                                                        (principal business: economics consulting)                               
                                                                                                                                
*Donald E.               Pacific Telesis Center         Chairman Emeritus                                                        
 Guinn                   130 Kearny St.                 Pacific Telesis Group                                                    
                         San Francisco, CA  94108       (principal business: telecommunications)                                 
                                                                                                                                
*Frank L.                2726 Shelter Island Dr.        Consulting Architect                                                     
 Hope                    San Diego, CA  92106           (principal business: architecture)                                        
</TABLE>
<PAGE>
 
<TABLE>
<CAPTION>
<S>                      <C>                            <C>
 H. Eugene               555 California Street          President, Global Retail Bank            
 Lockhart                San Francisco, CA  94104       Bank of America NT&SA                    
                                                        (principal business: banking and finance)
                                                                                              
*Walter E.               Office of the President        President                                
 Massey                  830 Westview Drive, S.W.       Morehouse College                        
                         Atlanta, GA  30314             (principal business: education)          
                                                                                              
 Jack L.                 555 California Street          Vice Chairman                            
 Meyers                  San Francisco, CA  94104       Bank of America NT&SA                    
                                                        (principal business: banking and finance)
                                                                                              
 Michael J.              555 California Street          President, Global Wholesale Bank         
 Murray                  San Francisco, CA  94104       Bank of America NT&SA                    
                                                        (principal business: banking and finance) 
 
 Michael E.              555 California Street          Vice Chairman and
 O'Neill                 San Francisco, CA  94104       Chief Financial Officer
                                                        Bank of America NT&SA
                                                        (principal business: banking and finance)
 
*John M.                227 West Monroe Street          Of counsel, Wachtell, Lipton, Rosen & Katz
 Richman                Chicago, IL  60606              (principal business: law)
 
*Sanford Robertson      555 California Street           (principal business: banking and finance)
                        San Francisco, CA  94104
 
*Richard M.             555 California Street           Retired
 Rosenberg              San Francisco, CA  94104
 
*A. Michael             Memorial Way, Room 140          Dean of Graduate School of Business
 Spence                 Stanford, CA  94305             Stanford University
                                                        (principal business: education)
 
 Martin A.              555 California Street           Vice Chairman
 Stein                  San Francisco, CA  94104        Bank of America NT&SA
                                                        (principal business: banking and finance)
 
*Solomon D.             1801 California Street          President and Chief Executive Officer
 Trujillo               Denver, CO  80202               US West Communications Group
                                                        (principal business: communication)
</TABLE>

                                       2
<PAGE>
 
                                   EXHIBIT B

             Directors and Executive Officers of Reporting Parties

                 Robertson Stephens Investment Management Co.


 
     The following table sets forth information regarding the executive officers
and directors of Robertson Stephens Investment Management Co. (directors are
indicated by asterisk), all of whom are U.S. citizens and none of whom own
securities of the issuer referred to in the attached filing.

<TABLE>
<S>  <S>             <C>                        <C>
*    Michael J.      555 California Street      Chairman and President,
     Murray          San Francisco, CA  94104   Robertson Stephens Investment Management Co.
                                                (holding company)

                                                        and

                     555 California Street      President, Global Wholesale Bank
                     San Francisco, CA  94104   Bank of America NT&SA
                                                (principal business: banking and finance)
</TABLE>


                            Bayview Holdings, Inc.


 
     The following table sets forth information regarding the executive officers
and directors of Bayview Holdings, Inc. (directors indicated by asterisk), all
of whom are U.S. citizens and none of whom own securities of the issuer referred
to in the attached filing.

<TABLE>
<S>  <S>             <C>                        <C>
*    G. Randall      555 California Street      Chairman of the Board and President
     Hecht           San Francisco, CA  94104   Bayview Holdings, Inc.
                                                (principal business: holding company)
 
     Terry R. Otton  555 California Street     Vice President and Chief Financial Officer
                     San Francisco, CA  94104  Bayview Holdings, Inc.
                                               (principal business: holding company)
 
                                                       and

                     555 California Street     Managing Director
                     San Francisco, CA  94104  BancAmerica Robertson Stephens
                                               (principal business: holding company)
</TABLE>

                                       3
<PAGE>
 
                        BancAmerica Robertson Stephens

 
     The following table sets forth information regarding the executive officers
and directors of Bayview Holdings, Inc. (directors are indicated by asterisk),
all of whom are U.S. citizens and none of whom own securities of the issuer
referred to in the attached filing.
 
<TABLE>
<S>  <C>                  <C>                       <C>
     Keith C. Barnish     555 California Street     Senior Managing Director
                          San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
     Walter J.            555 California Street     Senior Managing Director
     Bloomenthal          San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
*    Gregg H. Byers       555 California Street     (principal business: securities brokerage,
                          San Francisco, CA  94104  investment banking)
 
     Gideon Y.            555 California Street     Senior Managing Director
     Cohen                San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
     Mark S.              555 California Street     Senior Managing Director
     Dawley               San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
     Robert L. Emery      555 California Street     Managing Director
                          San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
     Martin               555 California Street     Senior Managing Director
     Essenberg            San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
     Gene S.              555 California Street     Senior Managing Director
     Evenskaas            San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
     Alison L. Falls      555 California Street     Senior Managing Director
                          San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
*    Zed S. Francis, III  555 California Street     (principal business: securities brokerage,
                          San Francisco, CA  94104  investment banking)

     David J.             555 California Street     Senior Managing Director
     Fullerton            San Francisco, CA  94104  (principal business: securities brokerage,

</TABLE>
 
                                       4
<PAGE>
 
<TABLE>
<S>  <C>                  <C>                       <C>
                                                    investment banking)
 
     Jonathan Hakala      555 California Street     Senior Managing Director
                          San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
*    David Halstead       555 California Street     (principal business: securities brokerage,
                          San Francisco, CA  94104  investment banking)
 
     Gregory V.           555 California Street     Senior Managing Director
     Johnson              San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
*    H. David Johnson     555 California Street     Senior Managing Director, Chief Operating Officer,
                          San Francisco, CA  94104  Chief Financial Officer and Secretary
                                                    (principal business: securities brokerage,
                                                    investment banking)
 
*    Michael G.           555 California Street     Managing Director
     McCaffery            San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
     Steven T.            555 California Street     Senior Managing Director
     Monahan, Jr.         San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
     Katherine            555 California Street     Senior Managing Director
     Pattison             San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
*    Robert T.            555 California Street     Chairman of the Board
     Slaymaker            San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
     Michael A.           555 California Street     Senior Managing Director
     Smith                San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
*    Anthony J.           555 California Street     Senior Managing Director
     Taddey               San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
 
*    Charles B. Truett    555 California Street     Senior Credit Officer
                          San Francisco, CA  94104  (principal business: securities brokerage,
                                                    investment banking)
</TABLE>
 
                                       5



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