Martin, You can use the 16C5x parts on the old DOS MPSIM to test your code. The instruction set and core is the same. Also the last version was 5.20, I believe. Starting with version 5.00, the 17C42, 17C43 and 17C44 were supported. Regards... Martin McCormick wrote: > > I am using mpsim for DOS. The documentation says that it > works for both the 16Cxx and 17Cxx processor families. Is there a > strategy one can use to take code that will actually run on a 12C5x > chip and at least be able to test it for fatal errors like > subroutines that don't return and logic errors? In other words am I > just going to have to wing it on 12C5x's or can I write the code for a > close relative of that group in the 16Cxx family in order to make sure > that it should run? > > Also, is the 17C43 too recent to simulate with mpsim? > > Martin McCormick -- ___________________________ | Darrel Johansen | | tempe, arizona | | darrelj@primenet.com | |_________________________|