I was looking over the documentation for mpsim and noticed that it simulates everything between 16C5x and 16C7x but not the 16C or 16F84. I think the 16F84 is functionally fairly close to one of the PIC's which is covered by mpsim so my question is whether or not I can use mpsim to develop code which is meant for a 16F84? Of course the best thing is to use the exact target system that is being simulated, but close would probably count for general program logic. Martin McCormick WB5AGZ Stillwater, OK 36.7N97.4W OSU Center for Computing and Information Services Data Communications Group