Ethan Dicks wrote: Motorola made a version of their MC68HC000 that ran at 16MHz. Back in the late 80's I was doing processor design for Nortel switching equipment and we had some applications that were written for the 68000 that would have taken too much work to convert software over for the 68020 (a lot of our stuff ran in supervisor mode, not user mode). SGS-Thompson was a licensee for the 68K family, and was the first company that produced a 16 MHz 68000. I think theirs was NMOS, not CMOS (it sure got warm). One day the Motorola guys brought in one of their sales managers to try do drum up business for their 68020 and I showed them the SGS-T part and asked them if they had anything like that. The answer was "we'll get back to you on that", which was then followed up with "you can use our 12 MHz 68HC000, run it at 16 MHz at room temperature for development, and soon we can provide screened parts that will run at 16 MHz". Eventually they did provide MC68HC000-16 parts. Regards, Alex The Calculator Museum Web Page http://www.calcmuseum.com