John,

I believe we spoke about your project before; I'll take care not to reveal anything in my comments.

If I were designing the prodution model, I'd take a long hard look at the CYGNAL 8051 microprocessors mentioned by our expert, Peter Dannegger.

CYGNAL:
http://www.cygnal.com

Recent Discusion about the chip:
http://8052.com/forum/rea...p;top=4421

It has attributes well suited for your application.

-Jay C. Box
a.k.a. Sonabouy@yahoo.com