Re: C64 buses when RESET is asserted

From: Michał Pleban <>
Date: Mon, 08 Apr 2013 20:44:55 +0200
Message-ID: <>
Hello! wrote:

> Well, if the additional HW is not too much, I'm happy to add it to
> ROM-el.  People have asked for such a capability many times.  I think I
> ran into problems finding the correct select logic, as /OE and /CS on
> the ROMs are not active on a write cycle to those areas of memory.

Do you mean hardware for substituting SRAM for ROM? Or substituting
Flash for ROM? I have the latter done, but for the exact reasons you
mention (CS not active on write) I use a small overlay on the SID chip
to steal the R/W signal and $D600-$D7FF address space to operate the
Flash. Plus one small CPLD.


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Received on 2013-04-08 19:01:09

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