Also I'm not real familiar with the 80386EX. Can you explain how it
    compares in cost and form factor to PC104?

The 80386EX is a processor chip, not particularly related to PC104.  It's
sort of the 186 (highly integrated) version of a 386, I think.


    You've never stated if UDP/SLIP, UDP/PPP, or UDP/IP/Ethernet would satisfy
    the application's needs? A full UDP stack is doable on a uController while
    a full TCP stack will require some help.

Heh.  PPP is so bloated that a microcontroller would be hard-pressed to
sypport a "full PPP."  (fortunately, this is rarely required.)

BillW