> I don't know if it's specifically the PC or some other system using an 8088/8086, but
> I seem to recall hearing about a system in MESS that's finicky because the hardware's
> floppy controller can actually halt the CPU mid-instruction. For something like that,
> you need to actually have per-cycle emulation rather than just instructions with
> correct cycle counts.
Oh wow, fascinating stuff. I've never heard of a PC that does that - I guess it would have to be done by gating the CPU's clock line. That must have been a tricky circuit to get working in the first place, let alone to emulate!