First of all; thanks for all the added information. I think I know enough just knowing that the 68HC000 should do the trick and is completely compatible with the old-school 68k. On 10/17/06, William Chops Westfield wrote: > > > I don't think there is much point in that. Did you have some > specific goal in mind? > Well, a friend has an old system that's kind of got a broken 68k, so he was actually thinking of replacing it with a 68HC000 that he came across. But because I heard something about the instruction set and probably even the timings differing like you know, I wasn't quite sure about it.. I guess that there is only one way to find out though... *evil grin*. Thanks again! Sean -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist