Tony Nixon wrote : < At the moment I am writing a windows based program that simulates the < PIC16C84. The software is intended for beginers to PICs, more so for < students who may be interested in learning to program. It < graphically displays how the chip functions, and can run code that < you write yourself. There are also modules that can be connected < such as a 7 segment display, to see how the ports work. < The software still has a way to go but if any one would like to try < it I can make a copy available. Some feedback would be welcome. Yes please Tony !! I would love to try out your software and will report back ! I don't know much about PICs yet but am keen to learn. TTFN Peter.