[A83] Re: Undocumented opcodes
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[A83] Re: Undocumented opcodes
> Has anyone already used undocumented opcodes in his or
her program, or
> are there any worth using?
Well, concerning the ixl/ixh/iyl/iyh instructions, I would
only use them when I'm really out of registers, because
they are slower than the normal ones (each takes 9 cycles,
I guess). They're still better than a memory reference,
though. The combined shift/set/res instructions are nice,
but I haven't found them useful so far. Probably if I
revisited some of my code...
BTW what is "neg" good for when you can use "cpl \ inc a"
instead? Same size, same clocks...
PG
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