The question is: is a cycle-exact mode for 68040/60 needed or even possible?
If i understand it right, cycle-exactness is needed only for demos/games
that rely on a certain sequence of instructions to run in a known
amount of cpu-cycles, in order to mess with the video-address or to
switch colors/resolution. Given that there haven't been that much real
machines with 040/060, and the timing of this processors is quite
different depending on cache modes/processor configuration/type of
memory in use, are there really any programs out there that make use of
it and actually work on real hardware? I would bet that such programs
would break on each end every change in configuration.