>as far as pinout is concerned. Are there any potential problems in
>replacing the 877 with a 452? (I know that I have to change the programming

Input impedance on the ADC pins.  You need 2.5K max on the 18F parts.

Andy

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads