Thanks for the replies, but are these the only registers that need saving during an interupt? Is it not a good idea to save the STATUS register? Have I been saving to many registers all along? Thanks Graham -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads