Thanks for all those with interest in the '84 simulator. I have now seen UMPS and it looks very impressive. My software is, on the other hand, aimed at young people who might be interested in learning PIC's and as such, has a sort of cartoonish stlye to it with everything laid out in front of you to let you visually see what is happening when you execute an instruction. As the software is mainly for the young beginners, when it is finished, the cost will most likely be free. It is my first Windows based software, and as I like working with PIC's, I thought it would be a project to learn by. (Big learn) As I mentioned, it is not complete, but it is it functional. To all those that expressed interest, a copy will be posted ASAP. Regards Tony Just when I thought I knew it all, I learned that I didn't.