Re: 6809

From: Nicolas Welte (
Date: 2001-02-21 10:11:16

Spiro Trikaliotis wrote:
> Hello Ruud,
> do you really mean 6809, not 6509? I would be interested in the former
> (6809), but not the latter (6509).

6509 CPUs are much wanted as a replacement for CBM-II machines. I think 6809s
are easier to get.

We were already talking a lot about replacing CBM CPUs with a 6502 or 65816,
and Ruud said he already did this. I wonder if it is possible to do this to
the 6509 as well. IIRC, adresses 0 and 1 contain some sort of a banking
register, that is only applied to the output port if some special opcodes are
executed. If the replacement processor has a SYNC ouput, it should be
possible to test for these opcodes with an external circuit and enable the
banking output accordingly.

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