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. Tony Just when I thought I knew it all, I learned that I didn't.