From: Andre Fachat (afachat_at_gmx.de)
Date: 2003-12-20 17:57:58
Hi All,
I think there are different versions of the PET usage of the $E000-$E7FF
area,
but I don't remember the details.
I know that in the CBM 8xxx models the E000-E7FF PET use this area as
the screen editor code.
The area $E900-$EFFF is being used - I think - by internationalized
versions
of the PET screen editor ROM (some CBM 8xxx). IIRC the I/O Area was
either 2k
($E800-$EFFF) or 256 byte ($E800-$E8FF) depending on the PET model. So
for the
newer PET versions there will be a ROM area.
I don't remember how the ROM was actually accessed and whether it was
mirrored. I would have to
dive back into the schematics again... :-)
Andre
Spiro Trikaliotis wrote:
>
> Hi Ruud,
>
> On Fri, Dec 19, 2003 at 01:12:47PM +0100, Baltissen, GJPAA (Ruud) wrote:
>
> > say so. If VICE has no mirrors and real 8032 indeed has them then
> > - VICE is wrong
> > - and I'm happy with it because it proofs I can use this area as I
> > want it :)
>
> Even if the mirrors were not there (and VICE is correct), this area will
> most probably be usable as the behaviour of VICE show's there would be
> open memory there.
>
> Spiro.
>
> --
> Spiro R. Trikaliotis
> http://www.trikaliotis.net/
>
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