ADDENDUM NO. 13 REVOLVING LOAN AND SECURITY AGREEMENT CONVERTIBLE REVOLVING CREDIT PROMISSORY NOTE

                                 EXHIBIT 10 (d)

                                 ADDENDUM NO. 13

                      REVOLVING LOAN AND SECURITY AGREEMENT

                  CONVERTIBLE REVOLVING CREDIT PROMISSORY NOTE

                             DATED OCTOBER 26, 1987

     For consideration given and received, Xxxxxx Xxxxxx and Howtek, Inc. hereby
agree to extend  the  repayment  date in  Paragraph  D of the  above  referenced
Convertible  Revolving  Credit  Promissory  Note, as amended,  (the "Note") from
January 4, 2002 to January 4, 2003.  Also the Note  hereafter  will be a maximum
principal sum of Three Million Dollars ($3,000,000).

     Effective the 29th day of December 2001.


HOWTEK, INC.



By: /s/  Xxxxxxx Xxxxxx                         /s/  Xxxxxx Xxxxxx
    --------------------------                  -------------------
Title:  Chief Financial Officer                 Xxxxxx Xxxxxx