Hi All,
Did once fit a 12Mhz 68000 in my old A500,
then rigged up a logic cct to double the clock
feed to the CPU 14Mhz ish.
The miggy ran fine , exactly twice as fast
but would not talk to the A590 (invalidated the disk)
but could format floppies at 880K *2, the standard
floppies were recognised as NDOS. :-D