Greenious wrote:ijor wrote:Timing depends, of course, on the CPU as well. I don't have personal experience with the CMOS part, but the 68HC is supposed to be fully compatible, even on undocumented features.
The asynchronous delays in the same cycle, such as tCO, are probable smaller (note that doesn't mean less cycles). Conceivable, and just conceivable, this might have some relevance. But if so, then this shouldn't be specific to the CMOS CPU. Some NMOS variations are faster than others. For instance, the MegaSTe CPU.
May be Jeff was thinking on the 68SEC000, the CPU used in the Minimig, I understand. This is a different beast and not 100% compatible.
68HC should be compatible, I believe HBS640 T28/36 used it, aswell as any other accelerator going beyong 16MHz, and this is the first time I've heard it's not 100% compatible.
I'm also inclined to think Jeff is thining of the SEC version.
No no. this was an M68HC000 @ 16Mhz.