Newson,

It was unclear from your note what your problem was.  We have
implemented an RS-232 serial interface to the 16C74 that works pretty well.
 We used the ByteCraft MPC compiler (C-language).  If it would help I would
be glad to forward you the source code for our intterupt routine.  Please let
me know.

I tried to e-mail you directly and it bounced....hope you get this.

Mark A. Corio
Rochester MicroSystems, Inc.
200 Buell Road, Suite 9
Rochester, NY  14624
Tel:  (716) 328-5850
Fax:  (716) 328-1144
e-mail:  Mcorio@aol.com

***** Designing Electronics For Research & Industry *****