> Matt
>
> Since you are already using a daughter board how much latitude do you
> have. A processor with the same die or something close like a
> MELPS740 or a little further afield like 6808 or father yet a PIC
>
> 6502 code can generally be translated to run on a MELPS by re-arranging
> the opcode map (I believe the instruction set is a super set but is
> remapped 6502)
> 6502 to 6808 close but be careful with carries are reversed in subtract
> chains (including compares)
> 6502 to PIC would take some work but is possible
>
>

What's the relationship between a 6501 and a 6502?
http://www.findchips.com shows some 6502 chips out there.

As I recall, comparing the 6502 with the 6800 (or 6802, which is what I
actually used), the 6502 had two 8 bit index registers and the 6800 had
one 16 bit index register. I think the 6502 may have also had an 8 bit
stack pointer, while the 6800 had a 16 bit stack pointer. So, besides
having different instruction sets, the architecture is different.

Is the 6502 maybe an improved 6501?

Harold

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