In message <NABBIDDPJGGANFPHEGAKCEGAFCAA.ame@synaptics.com>, Andrew
Errington <ame@SYNAPTICS.COM> writes
>According to Microchip's data sheet for the PIC16F84A the only differences
>noted (Table B-1 in Appendix B) are:
>1) Max voltage is now 5.5V, but top temperature +125degC
>2) Max frequency increased to 20MHz
>3) EEPROM cycle faster
>4) Rext range starts at 3kohm

There are also differences in the programming requirements (although I
don't think MicroChip mention it!). Many programmers (mine amongst them)
wouldn't program the 16F84A, I had to alter the erase routines to cure
the problem.
--

Nigel.

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