SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                            _________________________

                                  SCHEDULE 13G
                                 (Rule 13d-102)

                    INFORMATION TO BE INCLUDED IN STATEMENTS
                  FILED PURSUANT TO RULES 13d-1(b), (c) AND (d)
                AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(b)
                         (Amendment No. _______5_____)1

                                    Castelle

                                (Name of Issuer)

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

                                    147905103
--------------------------------------------------------------------------------
                                 (CUSIP NUMBER)

                                December 31, 2004

             (Date of Event Which Requires Filing of this Statement)


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

                  / /   Rule 13d-1(b)
                  /X/   Rule 13d-1(c)
                  / /   Rule 13d-1(d)


--------------------
1        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 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).




--------------------------------------------------------------------------------
NAME OF REPORTING PERSONS: Daniel Zeff
I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
--------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                               
                                            (a)  0
                                            (b)
--------------------------------------------------------------------------------
SEC USE ONLY

--------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION        United States of America

--------------------------------------------------------------------------------
    NUMBER OF     SOLE VOTING POWER                                   716,961
     SHARES            
 BENEFICIALLY
   OWNED BY
     EACH
   REPORTING
  PERSON WITH
------------------------------------------------------------------------------
                  SHARED VOTING POWER                                       0
                  
------------------------------------------------------------------------------
                  SOLE DISPOSITIVE POWER                              716,961
                  
------------------------------------------------------------------------------
                  SHARED DISPOSITIVE POWER                                  0
                  
------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON          716,961

------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES*
------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                      19.43%

------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*                                                  IN

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

                      *SEE INSTRUCTION BEFORE FILLING OUT!


                                      -2-





Item 1(a). Name of Issuer:

                    Castelle

Item 1(b). Address of Issuer's Principal Executive Offices:

                    855 Jarvis Drive
                    Morgan Hill, CA 95037

Item 2(a). Name of Person Filing:

                    Daniel Zeff
                    (the "Reporting Person")

Item 2(b). Address of Principal Business Office or, if None, Residence:

                    The principal business address of the Reporting
                    Person is:

                    c/o Zeff Holding Company, LLC
                    50 California Street, Suite 1500
                    San Francisco, CA 94111


Item 2(c). Citizenship:

                    Mr. Zeff is a United States citizen.

Item 2(d). Title of Class of Securities:

                    Common Stock, no par value

Item 2(e). CUSIP Number:

                    147905103 

                               -3-



Item 3.    If this statement is filed pursuant to Rule 13d-1(b), or 
           13d-2(b) or (c), check whether the person filing is a:  
                                                         Not Applicable

               (a)       [ ] Broker or dealer registered under
                             Section 15 of the Exchange Act;

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

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

               (d)       [ ] Investment Company registered under
                             Section 8 of the Investment Company Exchange
                             Act;

               (e)       [ ] Investment Adviser in accordance with
                             Rule 13d-1(b)(1)(ii)(E);

               (f)       [ ] Employee Benefit Plan or Endowment Fund
                             in accordance with Rule 13d-1(b)(1)(ii)(F);

               (g)       [ ] Parent Holding Company or Control Person
                             in accordance with Rule 13d-1(b)(1)(ii)(G);

               (h)       [ ] Saving Association as defined in Section
                             3(b) of The Federal Deposit Insurance Act;

               (i)       [ ] Church Plan that is excluded from the
                             definition of an Investment Company under
                             Section 3(c)(14) of the Investment Company
                             Act;

               (j)       [ ] Group, in accordance with Rule
                             13d-1(b)(1)(ii)(J).

Item 4.    Ownership.

           A.  Daniel Zeff

           (a)  Amount beneficially owned:                               716,961
           (b)  Percent of Class:                                         19.43%
           (c)   Number of shares as to which such person has:

               (i)  Sole power to vote or direct the vote:               716,961
               (ii) Shared power to vote or to direct the vote:                0
               (iii)Sole power to dispose or direct the disposition of:  716,961
               (iv) Shared power to dispose or to direct the disposition of:   0


                    As calculated in accordance with Rule 13d-3 of the
                    Securities Exchange Act of 1934, as amended, Daniel
                    Zeff beneficially owns 716,961 shares of the Issuer's
                    Common Stock, no par value ("Common Stock"),

                                      -4-




                    representing 19.43% of the Common Stock. Mr. Zeff
                    does not directly own any shares of Common Stock, but
                    he indirectly owns 716,961 shares of Common Stock in
                    his capacity as the sole manager and member of Zeff
                    Holding Company, LLC a Delaware limited liability
                    company ("ZHC") which in turn serves as the general
                    partner for Zeff Capital Partners I, L.P. ("ZCP"), a
                    Delaware Limited Partnership. Mr. Zeff also provides
                    discretionary investment management services to Zeff
                    Capital Offshore Fund ("ZCF"), a class of shares of
                    Spectrum Galaxy Fund Ltd., a company incorporated in
                    the British Virgin Islands.

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

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

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

                    Each of ZCP and ZCF have the right to receive and the
                    power to direct the receipt of dividends from, and
                    the proceeds from the sale of, the shares of Common
                    Stock held by them.

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

                    Not Applicable

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

                    Not Applicable

Item 9.    Notice of Dissolution of Group.

                    Not Applicable


                                      -5-





Item 10. Certification.

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


                                    SIGNATURE


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

Dated:  February 4, 2005

                                                              /s/Daniel Zeff    
                                                              --------------    
                                                              Daniel Zeff





        Attention:  Intentional  misstatements  or omissions of fact  constitute
Federal criminal violations (see 18 U.S.C. 1001).



                                      -6-