From: David Wood (jbevren_at_starbase.globalpc.net)
Date: 2003-12-19 01:07:31
This is educated guesswork, but I'd have to say the lower half. Designers
typically set things up for the low address, and commodore, softwarewise,
has a tendancy to do the same thing, at least with mirrored IO ranges.
Comments?
-jbev
On Thu, 18 Dec 2003, Baltissen, GJPAA (Ruud) wrote:
> Hallo allemaal,
>
> I am looking for some extra I/O space inside my 8032. I first thought that
> $E900/EFFF wasn't used but the schematics revealed that $E000/EFFF is
> occupied by UD7, a 2316 = 2 KB ROM. That is, not completely: $E8xx is
> excluded. Being a 2316 means that $E900/EFFF is a mirror of $E100/E7FF.
>
> My question: what area is exactly used: the lower or upper half of $Exxx?
>
> I suspect that the upper half is not used. In that case I could hack the
> board so I can use $E900/EFFF for my own purposes.
>
> Any comment is welcome.
>
>
> --
> ___
> / __|__
> / / |_/ Groetjes, Ruud
> \ \__|_\
> \___| <http://Ruud.C64.org> http://Ruud.C64.org
>
>
>
>
>
>
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