>
> It seems that the 6502 has a lot of undocumented instructions.
> And the 6507?! :-O
The 6507 is just a 6502 in cost-reduced packaging. The undocumented
instructions will work the same. Sure, they'd screw up an emulator
and possibly redesigned 2600's like the TV-Boy, as later 6502 designs
made use of the opcode space for other purposes.
A quick rule of thumb is that opcodes of x3 do a x2 followed by x1.
x7 does x6 followed by x5. It's probably not worth your time messing
with them until you've mastered vanilla 6502 to the limits ;)
- Jim
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