AMERINDO INVESTMENT ADVISORS INC
SC 13D/A, 1997-08-15
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                  SCHEDULE 13D/A

                   Under the Securities Exchange Act of 1934
                               (Amendment No. 3 ) *

                           PREMISYS COMMUNICATIONS INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  COMMON STOCK
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   740584107
                        -------------------------------
                                 (CUSIP Number)
                     

                Alberto W. Vilar, Amerindo Investment Advisors Inc., 
                         One Embarcadero Center, Suite 2300,
              San Francisco, CA 94111-3162;  Telephone:  (415) 362-0292
- --------------------------------------------------------------------------------
                   (Name, Address and Telephone Number of Persons
                   Authorized to Receive Notices and Communications)


                                 August 8, 1997
- --------------------------------------------------------------------------------
              (Date of Event which Requires Filing 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/A, and is filing this
schedule because of Rule 13D-1(b)(3) or (4), check the following space     .
                                                                       ---

Check the following space 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).
                        (Continued on following page(s))

<PAGE>CUSIP 
No.  740584107                        13D/A

- --------------------------------------------------------------------------------
  1  Name of Reporting Person
     S.S. or I.R.S. Identification No. of Above Person

     AMERINDO INVESTMENT ADVISORS INC., a California corporation, AMERINDO 
     INVESTMENT ADVISORS, INC., a Panama corporation, the AMERINDO INVESTMENT
     ADVISORS INC. PROFIT SHARING TRUST, ALBERTO W. VILAR AND GARY A. TANAKA,
     who disaffirm the existence of any group and who are sometimes
     collectively referred to as the "Reporting Persons."

- --------------------------------------------------------------------------------
  2  Check the Appropriate Box if a Member of a Group*            (a)   [ ]

                                                                  (b)   [ ]
- --------------------------------------------------------------------------------
  3  SEC Use Only

- --------------------------------------------------------------------------------
  4  Source of Funds*
     00

- --------------------------------------------------------------------------------
  5  Check Box if Disclosure of Legal Proceedings is Required           [ ]

- --------------------------------------------------------------------------------
  6  Citizenship or Place of Organization

     See Item 6 of separate cover pages for Reporting Persons

- --------------------------------------------------------------------------------
                 7  	Sole Voting Power

    Number of  		2,000 shares in the aggregate for all Reporting Persons and
     Shares		as to all but a portion of which beneficial ownership is
  Beneficially		disclaimed
    Owned By
      Each     -----------------------------------------------------------------
    Reporting 
     Person 	   8 	Shared Voting Power
      With 
                  	3,156,972 shares in the aggregate for all Reporting Persons
                   	and as to all of which beneficial ownership is disclaimed

               -----------------------------------------------------------------
                 9 	Sole Dispositive Power
 
          		2,000 shares in the aggregate for all Reporting Persons and
			as to all but a portion of which beneficial ownership is
			disclaimed

               -----------------------------------------------------------------
                 10	Shared Dispositive Power 

                 	3,156,972 shares in the aggregate for all Reporting Persons
               		and as to all of which beneficial ownership is disclaimed
                     
- --------------------------------------------------------------------------------
 11  Aggregate Amount Beneficially Owned By Each Reporting Person
                                      
     3,158,972 shares in the aggregate for all Reporting Persons and as to
     all but up to 2,000 of which beneficial ownership is disclaimed

- --------------------------------------------------------------------------------
 12  Check Box if the Aggregate Amount in Row (11) excludes Certain
     Shares*                                                            [X]

- --------------------------------------------------------------------------------
 13  Percent of Class Represented by Amount in Row (11)                 12.56%

- --------------------------------------------------------------------------------
 14  Type of Reporting Person*                                     IA, EP, IN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                     - 2 of 14 -
<PAGE>
CUSIP 
No.  740584107                        13D/A

- --------------------------------------------------------------------------------
  1  Name of Reporting Person
     S.S. or I.R.S. Identification No. of Above Person

     AMERINDO INVESTMENT ADVISORS INC.
 
- --------------------------------------------------------------------------------
  2  Check the Appropriate Box if a Member of a Group*            (a)   [ ]

                                                                  (b)   [ ]
- --------------------------------------------------------------------------------
  3  SEC Use Only

- --------------------------------------------------------------------------------
  4  Source of Funds*
     00

- --------------------------------------------------------------------------------
  5  Check Box if Disclosure of Legal Proceedings is Required           [ ]

- --------------------------------------------------------------------------------
  6  Citizenship or Place of Organization

     California

- --------------------------------------------------------------------------------
                 7 	Sole Voting Power

    Number of    	None
     Shares          
  Beneficially -----------------------------------------------------------------
    Owned By   
      Each       8  	Shared Voting Power
    Reporting    
     Person       	2,932,494 shares, as to all of which beneficial ownership 
      With        	is disclaimed          

               -----------------------------------------------------------------
                 9 	Sole Dispositive Power

                  	None
 
               -----------------------------------------------------------------
                 10 	Shared Dispositive Power 

                	2,932,494 shares, as to all of which beneficial ownership 
                 	is disclaimed
                     
- --------------------------------------------------------------------------------
 11  Aggregate Amount Beneficially Owned By Each Reporting Person
                                      
     2,932,494 shares, as to all of which beneficial ownership is disclaimed

- --------------------------------------------------------------------------------
 12  Check Box if the Aggregate Amount in Row (11) excludes Certain
     Shares*                                                            [X]

- --------------------------------------------------------------------------------
 13  Percent of Class Represented by Amount in Row (11)               11.66%

- --------------------------------------------------------------------------------
 14  Type of Reporting Person*                                           IA

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                     - 3 of 14 -




<PAGE>

CUSIP 
No.  740584107                        13D/A

- --------------------------------------------------------------------------------
  1  Name of Reporting Person
     S.S. or I.R.S. Identification No. of Above Person

     AMERINDO INVESTMENT ADVISORS, INC.

- --------------------------------------------------------------------------------
  2  Check the Appropriate Box if a Member of a Group*            (a)   [ ]

                                                                  (b)   [ ]
- --------------------------------------------------------------------------------
  3  SEC Use Only

- --------------------------------------------------------------------------------
  4  Source of Funds*
     00

- --------------------------------------------------------------------------------
  5  Check Box if Disclosure of Legal Proceedings is Required           [ ]

- --------------------------------------------------------------------------------
  6  Citizenship or Place of Organization

     Panama

- --------------------------------------------------------------------------------
                 7 	Sole Voting Power

    Number of     	None
     Shares          
  Beneficially  ----------------------------------------------------------------
    Owned By
      Each       8 	Shared Voting Power
    Reporting  
     Person      	224,478 shares, as to all of which beneficial ownership 
      With       	is disclaimed         
 
                ----------------------------------------------------------------
                 9 	Sole Dispositive Power
 
                  	None

                ----------------------------------------------------------------
                 10 	Shared Dispositive Power 

                   	224,478 shares, as to all of which beneficial ownership 
                   	disclaimed

- --------------------------------------------------------------------------------
 11  Aggregate Amount Beneficially Owned By Each Reporting Person
                                      
     224,478 shares, as to all of which beneficial ownership disclaimed

- --------------------------------------------------------------------------------
 12  Check Box if the Aggregate Amount in Row (11) excludes Certain
     Shares*                                                            [X]

- --------------------------------------------------------------------------------
 13  Percent of Class Represented by Amount in Row (11)                 0.89%

- --------------------------------------------------------------------------------
 14  Type of Reporting Person*                                            IA

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                     - 4 of 14 -



<PAGE>
CUSIP 
No.  740584107                        13D/A

- --------------------------------------------------------------------------------
  1  Name of Reporting Person
     S.S. or I.R.S. Identification No. of Above Person

     AMERINDO INVESTMENT ADVISORS INC. PROFIT SHARING TRUST

- --------------------------------------------------------------------------------
  2  Check the Appropriate Box if a Member of a Group*            (a)   [ ]

                                                                  (b)   [ ]
- --------------------------------------------------------------------------------
  3  SEC Use Only

- --------------------------------------------------------------------------------
  4  Source of Funds*
     00

- --------------------------------------------------------------------------------
  5  Check Box if Disclosure of Legal Proceedings is Required           [ ]

- --------------------------------------------------------------------------------
  6  Citizenship or Place of Organization

     Florida

- --------------------------------------------------------------------------------
                 7  	Sole Voting Power

    Number of  		2,000 shares, as to all of which beneficial ownership
     Shares		is disclaimed
  Beneficially
    Owned By    ----------------------------------------------------------------
      Each
    Reporting    8  	Shared Voting Power
     Person 
      With       	None
      
                ----------------------------------------------------------------
                 9  	Sole Dispositive Power
 
        		2,000 shares, as to all of which beneficial ownership
			is disclaimed

                ----------------------------------------------------------------
                 10 	Shared Dispositive Power 

                     	None

- --------------------------------------------------------------------------------
 11  Aggregate Amount Beneficially Owned By Each Reporting Person
                                      
     2,000 shares, as to all of which beneficial ownership is disclaimed

- --------------------------------------------------------------------------------
 12  Check Box if the Aggregate Amount in Row (11) excludes Certain
     Shares*                                                            [X]

- --------------------------------------------------------------------------------
 13  Percent of Class Represented by Amount in Row (11)                    0.01%

- --------------------------------------------------------------------------------
 14  Type of Reporting Person*                                               EP

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                     - 5 of 14 -



<PAGE>
CUSIP 
No.  740584107                        13D/A

- --------------------------------------------------------------------------------
  1  Name of Reporting Person
     S.S. or I.R.S. Identification No. of Above Person

     ALBERTO W. VILAR

- --------------------------------------------------------------------------------
  2  Check the Appropriate Box if a Member of a Group*            (a)   [ ]

                                                                  (b)   [ ]
- --------------------------------------------------------------------------------
  3  SEC Use Only

- --------------------------------------------------------------------------------
  4  Source of Funds*
     00

- --------------------------------------------------------------------------------
  5  Check Box if Disclosure of Legal Proceedings is Required           [ ]

- --------------------------------------------------------------------------------
  6  Citizenship or Place of Organization

     United States

- --------------------------------------------------------------------------------
                 7 	Sole Voting Power

    Number of   	2,000 shares, as to only a portion of which beneficial
     Shares		ownership is affirmed
  Beneficially                                          
    Owned By    ----------------------------------------------------------------
      Each
    Reporting    8 	3,156,972 shares, as to all of which beneficial ownership
     Person        	is disclaimed
      With
                ----------------------------------------------------------------
  
                  9 	Sole Dispositive Power
 
                	2,000 shares, as to only a portion of which beneficial
			ownership is affirmed

                ----------------------------------------------------------------
                 10	Shared Dispositive Power 

                 	3,156,972 shares, as to all of which beneficial ownership
                	is disclaimed

- --------------------------------------------------------------------------------
 11  Aggregate Amount Beneficially Owned By Each Reporting Person
                                      
     3,158,972 shares, as to all but a portion of which beneficial ownership 
     is disclaimed

- --------------------------------------------------------------------------------
 12  Check Box if the Aggregate Amount in Row (11) excludes Certain
     Shares*                                                            [X]

- --------------------------------------------------------------------------------
 13  Percent of Class Represented by Amount in Row (11)                  12.56%

- --------------------------------------------------------------------------------
 14  Type of Reporting Person*                                      	    IN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                     - 6 of 14 -



<PAGE>
CUSIP 
No.  740584107                        13D/A

- --------------------------------------------------------------------------------
  1  Name of Reporting Person
     S.S. or I.R.S. Identification No. of Above Person

     GARY A. TANAKA

- --------------------------------------------------------------------------------
  2  Check the Appropriate Box if a Member of a Group*            (a)   [ ]

                                                                  (b)   [ ]
- --------------------------------------------------------------------------------
  3  SEC Use Only

- --------------------------------------------------------------------------------
  4  Source of Funds*
     00

- --------------------------------------------------------------------------------
  5  Check Box if Disclosure of Legal Proceedings is Required           [ ]

- --------------------------------------------------------------------------------
  6  Citizenship or Place of Organization

     United States

- --------------------------------------------------------------------------------
                  7 	Sole Voting Power

    Number of  		None
     Shares          
  Beneficially  
    Owned By    ----------------------------------------------------------------
      Each        8 	Shared Voting Power
    Reporting  
     Person       	3,156,972 shares, as to all of which beneficial ownership 
      With       	is disclaimed          

                ----------------------------------------------------------------
                  9 	Sole Dispositive Power
 
                	None

                ----------------------------------------------------------------
                  10	Shared Dispositive Power 

               	3,156,972 shares, as to all of which beneficial ownership 
              		is disclaimed

- --------------------------------------------------------------------------------
 11  Aggregate Amount Beneficially Owned By Each Reporting Person
                                      
     3,156,972 shares, as to all of which beneficial ownership disclaimed

- --------------------------------------------------------------------------------
 12  Check Box if the Aggregate Amount in Row (11) excludes Certain
     Shares*                                                            [X]

- --------------------------------------------------------------------------------
 13  Percent of Class Represented by Amount in Row (11)                  12.55%

- --------------------------------------------------------------------------------
 14  Type of Reporting Person*                                    	    IN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                     - 7 of 14 -



<PAGE>
CUSIP 
No.  740584107                        13D/A

ITEM 1.   Security and Issuer.
- -------   -------------------

The class of equity securities to which this statement relates is the 
Common Stock of Premisys Communications Inc. ("the Issuer"), whose principal 
executive offices are located at 48664 Milmont Drive, Freemont, CA 94538.

ITEM 2.   Identity and Background.
- ------    -----------------------

          This statement is being filed by Amerindo Investment Advisors Inc., 
a California corporation whose principal executive offices are located at 
One Embarcadero Center, Suite 2300, San Francisco, California, 94111 
("Amerindo"), Amerindo Investment Advisors, Inc., a Panama corporation, whose 
principal executive offices are located at Edificio Sucre, Calle 48 Este, Bella 
Vista, Apartado 6277, Panama 5, Panama ("Amerindo Panama"), the Amerindo 
Investment Advisors Inc. Profit Sharing Trust, the address of which is Gables 
International Plaza, 2655 Le Jeune Road, Suite 524, Coral Gables, FL 33134 
(the "Plan"), and Alberto W. Vilar and Gary A. Tanaka.  Although this statement 
is being made jointly by Amerindo, Amerindo Panama, the Plan and Messrs. Vilar 
and Tanaka, each of them expressly disaffirms membership in any group under 
Rule 13D-5 under the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), or otherwise.  

          Amerindo is registered as an investment advisor under the Investment
Advisors Act of 1940, as amended.  Messrs. Alberto W. Vilar and Gary A. Tanaka, 
whose business addresses are the same as those set forth for Amerindo and each 
of whom is a U.S. citizen, are the only directors and executive officers of
Amerindo Panama.  They are also the only directors and executive officers of 
Amerindo, other than Mr. James H. Furey, Chief Operating Officer, and 
Mr. Joaquin Garcia-Larrieu, Chief Financial Officer. Mr. Furey and Mr. Garcia's 
business addresses are at Amerindo's offices at 399 Park Avenue, New York, New 
York 10022.  Amerindo, Amerindo Panama, the Plan and Messrs. Vilar and Tanaka 
are sometimes hereinafter collectively referred to as the "Reporting Persons."  
Messrs. Vilar, Tanaka, Furey and Garcia are sometimes hereinafter collectively 
referred to as the "Other Named Individuals."

          During the last five Quarters, none of the Reporting Persons or Other 
Named Individuals has been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors), nor has any such individual or entity
been a party to a civil proceeding of a judicial or administrative body of
competent jurisdiction as a result of which proceeding such individual or
entity 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.


ITEM 3.   Source and Amounts of Funds or Other Consideration.
- -------   --------------------------------------------------

          All purchases of the subject securities by the Reporting Persons
have been in the ordinary course of the respective businesses of Amerindo
and Amerindo Panama (collectively, the "Advisor Entities") as investment 
advisors.  Accordingly, the funds used to purchase the subject securities 
have been client funds pertaining to accounts under management, except that 
the shares owned by the Plan were purchased with Plan assets. Purchases of 
the Issuer's securities by the Named Individuals would all be and have all 
been made with their personal funds, except that margin credit may also be, 
and may have been, employed.


                                     - 8 of 14 -


<PAGE>

ITEM 4.   Purpose of Transaction.
- -------   ----------------------

        All of the subject securities have been purchased by the Advisor
Entities in the ordinary course of their respective businesses as
investment advisors (or, in the case of securities held by the Plan, in the
ordinary course of investing for the Plan), and not with the purpose of
effecting change or influencing the control of the issuer or in
connection with or as a participant in any transaction having such purpose
or effect, including any transaction subject to Rule 13D-3(b) under the
Exchange Act.  Additionally, because each of the Advisor Entities is
obligated to act in the best interests of its respective clients and in
accordance with the respective mandates of those clients, there is no
agreement between or among any of the Reporting Persons to act together
with respect to the Issuer or its securities, except that they may, from
time to time and provided that transactions are otherwise being effected at
the same time, aggregate orders for client accounts in order to receive
more favorable trading terms.  Any of the subject securities acquired or
which might in the future be acquired by any of the Named Individuals have
been and would be acquired for investment and not with the purpose of
effecting change or influencing the control of the issuer or in connection 
with or as a participant in any transaction having such purpose or effect, 
including any transaction subject to Rule 13D-3(b) under the Exchange Act. 


ITEM 5.  Interests in Securities of Issuer.
- -------  ---------------------------------

         (a)  See Exhibit "A" attached hereto for information setting forth for
each of the Reporting Persons and for each Named Individual the aggregate number
of shares of the Common Stock of Issuer beneficially owned by such person as of
August 8, 1997, and the percentage which such shares constitute of the total
number of shares outstanding, as reflected on Issuer's Form 10Q for the Quarter
Ending March 28, 1997, unless information has been obtained as of a later
date directly from the Issuer (with beneficial ownership determined as set forth
in Rule 13D-3 under the Exchange Act, but disclaimed except as set forth in the
Exhibit).

          (b) Messrs. Vilar and Tanaka share voting and dispositive power
over all shares shown as owned by any of the Reporting Persons, except that Mr. 
Vilar has sole voting and dispositive power over the 2,000 shares held by the
Plan; however, each client of the Advisor Entities has the unilateral right to 
terminate the advisory arrangement with the Entity in question on notice which 
typically need not exceed 30 days.  Each of the Other Named Individuals has 
sole voting and dispositive power as to the shares shown in Exhibit "A" as 
owned by him.

          (c) The table contained in Exhibit "B" attached hereto sets forth for 
each of the Reporting Persons and Named Individuals information concerning all
acquisitions and dispositions of Issuer's Common Stock by any such person
during the period beginning on June 9, 1997, and ending on August 8, 
1997, including (i) the date of the transaction (ii) whether the transaction 
was a purchase or sale, (iii) the number of shares involved, and (iv) the price 
per share at which the transaction was effected.  All transactions were 
effected on the open market.

          (d) The shares covered by this statement are all owned by clients
of the Advisor Entities and/or the Plan.  No such person's interest in the
securities included in this statement exceeds 5% of the class outstanding.

          (e) Inapplicable

                                     - 9 of 14 -



<PAGE>
ITEM 6.   Contracts, Arrangements, Understandings or
- ------    Relationships with Respect to Securities
          of the Issuer.
          ------------------------------------------

          Messrs. Vilar and Tanaka are the sole shareholders and directors
of each of the Advisor Entities.  As stated above, clients of those
Entities generally have the right to terminate their investment advisory
arrangements with those Entities on notice of 30 days or less.


ITEM 7.   Material to be Filed as Exhibits.
- ------    --------------------------------

          Inapplicable.

                                     - 10 of 14 -

<PAGE>

                                   SIGNATURES
                                   ----------

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


                                   AMERINDO INVESTMENT ADVISORS INC.,
                                   a California corporation
                        
                                   By:  /s/ Alberto W. Vilar
                                        --------------------------------------
                                        ALBERTO W. VILAR, PRESIDENT



                                   AMERINDO INVESTMENT ADVISORS, INC.,
                                   a Panama corporation

                                   By:  /s/ Alberto W. Vilar
                                        --------------------------------------
                                        ALBERTO W. VILAR, DIRECTOR



                                   AMERINDO INVESTMENT ADVISORS INC.,
                                   PROFIT SHARING TRUST

                                   By:  /s/ Alberto W. Vilar
                                        --------------------------------------
                                        ALBERTO W. VILAR, TRUSTEE



                                        /s/ Alberto W. Vilar
                                        --------------------------------------
                                        ALBERTO W. VILAR


                                        /s/ Gary A. Tanaka
                                        --------------------------------------
                                        GARY A. TANAKA



                                     - 11 of 14 -

<PAGE>


                                 EXHIBIT A
  
                         PREMISYS COMMUNICATIONS INC.

                               COMMON STOCK

                                 740584107


                            


     The following table sets forth for each of the Reporting Persons and
for each Other Named Individual the aggregate number of shares of the Common
Stock of the Issuer beneficially owned by such person as of August 8, 1997,
and the percentage which such shares constitute of the total number of
shares outstanding, as reflected on the Issuer's Form 10Q for the Quarter 
Ending March 28, 1997, unless based on more recent information obtained
directly from the Issuer (with beneficial ownership determined as set forth 
in Rule 13D-3 under the Exchange Act, but disclaimed as set forth in the 
footnote):

          NAME                   NO. OF SHARES (1)       PERCENT OF CLASS
          ----                   -------------           ----------------
          Amerindo                  2,932,494                    11.66%

          Amerindo Panama             224,478                     0.89%

          Plan                          2,000                     0.01%

          Alberto W. Vilar          3,158,972                    12.56%

          Gary A. Tanaka            3,156,972                    12.55%

          James H. Furey                    0                     0.00%

          Joaquin Garcia                    0                     0.00%


_____________________________________

(1)  Messrs. Vilar and Tanaka, as the sole directors and shareholders of
each of the Advisor Entities, share voting and investment power as to all
shares shown as owned by the Advisor Entities, but they and the Advisor
Entities disclaim ownership of any of such shares.  As sole trustee of the
Plan, Mr. Vilar exercises sole investment and dispositive power as to the
shares shown as owned by the Plan, but disclaims beneficial ownership of
any of such shares except insofar as concerns his indirect interest therein
by reason of his pro rata interest in the Plan.  The number of shares shown
as owned by the Other Named Individuals does not include any owned
indirectly by them as participants in the Plan.  Each client of the Advisor
Entities has the unilateral right to terminate the advisory arrangement
with the Entity in question on notice which typically need not exceed 30
days.


                                     - 12 of 14 -

<PAGE>


                              EXHIBIT B

                      PREMISYS COMMUNICATIONS INC.

                            COMMON STOCK

                              740584107


     The following table sets forth for each of the Reporting Persons and Other
Named Individuals information concerning all acquisitions and dispositions
of the Issuer's Common Stock by any such person during the period beginning
on June 9, 1997, and ending on August 8, 1997, including (i) the
date of the transaction (ii) whether the transaction was a purchase or
sale, (iii) the number of shares involved, and (iv) the price per share at
which the transaction was effected.  All transactions were effected on the
open market.


                                 Type of         Number        Price
Name                 Date        Transaction     of Shares     per Share
- ----                 ----        -----------     ---------     ---------
Amerindo		07-30-97	Sell		100,000		21.656
Amerindo		07-31-97	Sell		157,500		20.573
Amerindo		08-04-97	Sell		  70,000		21.214
Amerindo		08-05-97	Sell		  42,500		21.676
Amerindo Panama		08-07-97	Sell		100,000		20.750






                                    - 13 of 14 -


<PAGE>

                                   EXHIBIT C

                           PREMISYS COMMUNICATIONS INC.

                                 COMMON STOCK

                                   740584107

                                        
We hereby agree that the within Statement on Schedule 13D/A regarding our 
beneficial ownership of Common Stock is filed on behalf of each of us.


                                   AMERINDO INVESTMENT ADVISORS INC.,
                                   a California corporation
                          
                                   By:  /s/ Alberto W. Vilar
                                        --------------------------------------
                                        ALBERTO W. VILAR, PRESIDENT



                                   AMERINDO INVESTMENT ADVISORS, INC.,
                                   a Panama corporation

                                   By:  /s/ Alberto W. Vilar
                                        --------------------------------------
                                        ALBERTO W. VILAR, DIRECTOR



                                   AMERINDO INVESTMENT ADVISORS INC.,
                                   PROFIT SHARING TRUST

                                   By:  /s/ Alberto W. Vilar
                                        --------------------------------------
                                        ALBERTO W. VILAR, TRUSTEE



                                        /s/ Alberto W. Vilar
                                        --------------------------------------
                                        ALBERTO W. VILAR


                                        /s/ Gary A. Tanaka
                                        --------------------------------------
                                        GARY A. TANAKA



                                   - 14 of 14 -




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