I was on Dontronics readin Scott Edwards online book that shows how the basic st amp executes some of their opcodes and when u bring their ASM files into mplab t he code is supposed to be in microchip format, most is, but where i get confused is there are lines like this D = ra.0 now MPLAB gives me an error that ra.0 is not defined. how do i define ra.0 to b e portA bit 0? might be a dum question but.. MikE Send someone a cool Dynamitemail flashcard greeting!! And get rewarded. GO AHEAD! http://cards.dynamitemail.com/index.php3?rid=fc-41