The 6800/6802 is probably as hard to get as the 6501/6502
I have translated 6502 to 6808. 6808 has one 8/16 bit index
but the code translates quite easily. The biggest issue is the C bit
which has the opposite sense in subtracts.

The 6502 and 6501 are very close.

w..


Harold Hallikainen wrote:

> > 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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