Olin, code and schematic sent separately as two together are just a little too big for one post Also RAM_START EQU H'0000' START_VECTOR EQU H'00000' PROG_START EQU H'00020' LOW_IRQ_VECTOR EQU H'00018' added to P18F2520.inc -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist