3 Oct
2002
3 Oct
'02
12:48 p.m.
Speaking of
the 65C02, does anyone know if replacing the 6502 in a PET
or VIC-20 is known to trip up copy protection on any apps/games? I
know that for well-behaved code, there should be no problems. I'm
concerned about WordPro or some other pirate-fearing program trying
to be clever with undocumented op codes, and not working with a real
65C02.
There's always the possibility, but CMOS versions would be much
better candidates for such perverse cleverness than the old NMOS parts.
At least I vaguely recall that most if not all
unimplemented instructions for the NMOS 6502 either sent the
CPU careening off into the weeds or were simple duplicates of
"legal" op-codes due to incomplete op-decoding.