Exhibit 10.80 Applied Data Communications, Inc. 3324 S. Susan Street Santa Ana, CA 92704-6841 Re: Series C Preferred Stock ------------------------ Gentlemen: I hold 68,404 shares of Series C Preferred Stock of Applied Data Communications, Inc....

                                                                   Exhibit 10.80

Applied Data Communications, Inc.
0000 X. Xxxxx Xxxxxx
Xxxxx Xxx, XX  00000-0000

     Re:  Series C Preferred Stock
          ------------------------


Gentlemen:

     I hold 68,404 shares of Series C Preferred Stock of Applied Data
Communications, Inc. ("ADC") which I acquired to fulfill voting requirements
imposed by Xxxxxx Xxxxxxx and the Leasing Partnership of Star Media Partners and
MultiMedia Disk Duplicators.

     This will confirm my understanding and agreement that I will convert all
shares of Series C Preferred Stock which are no longer subject to such proxy,
whether because ADC has met requirements or otherwise.  I will not exercise the
voting rights of the Series C Preferred Shares.

     This commitment is binding on my successors, assigns and heirs.

     Executed this 28/th/ day of September, 2001.

                                             /s/ Xxxxxx X. Xxxx
                                        ----------------------------------------
                                        Xxxxxx X. ("Pat") Xxxx

Acknowledged and Accepted:

     /s/ Xxxxx X. Xxxxxx, Xx.
------------------------------------
Xxxxx X. Xxxxxx, Xx.
for Applied Data Communications, Inc.
September 28, 2001