Now, of course, such an effort would be in violation
of DMCA, but it
worked back then. I'm surprised that no one did that with the Mac
ROMs--anyone know why not?
Probably because they would also then need to clone the system software
as well, a much bigger task for a much smaller (potential) market.
Apple would have been much less likely to deal with clone makers than
Microsoft was. While the system software was made freely available in
the early years, it is unlikely it would have stayed that way if clone
makers had been successful.
For a brief period, NewTek did have a Macintosh clone with a 68030 and
system software that was a hybrid of System 6 and System 7, with a user
interface based on Motif. It suffered the same problems as the 1st -
gen IBM clones as far as compatibility.