From: Andre Fachat (a.fachat_at_gmx.de)
Date: 2002-04-28 20:51:38
Hallo!
What about the 6509? That is a 6502 with the difference that it has
4 more address lines. The output values of the 4 address bits is
determined by the values of register 0 and 1. register 1 is used for
the data load and store operations in the lda (),y and sta (),y
opcodes and reg. 0 otherwise. (r0/r1 maybe vice versa, but in principle
that is it).
This CPU is not available anymore as far as I know. So it would be good
to have a hardware replacement for it.
Andre
Gideon Zweijtzer wrote:
> |BTW: what's your opinion, should it be possible to modify your design
> |for emulating a 8501 CPU (the heart of C16 / C116 / Plus/4)?
>
> Of course, that shouldn't be a problem; I think it is just a 6502 with some
> tiny modifications. I am planning to implement the 65816 as well, since
> there are many users.
>
> Gideon
>
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