Hi PIcers?

I wrote a piece of code which runs fine on a 16C84 and then i tried it
on a 16C71 without success.. I don't really understand why, 'cause
the two uCs seem to be identical with the exception of course of the
DA converter of the C71 and the EEPROM of the 16C84.
Since my code doesn't use any DA or EEPROM i believe it should run on
both UC without modifications. Right?
Anybody knows what might be wrong?

Tips: Thesame source was recompiled for each uC.
I'm testing the 2 chips on the same board that works well. (the 16C71 actually
runs).
The program doesn't even use timers and watchdogs and such things.

Thanx
Spiros Papageorgiou
Email:
mc89114@central.ntua.gr