8032: $Exxx ROM area

From: Baltissen, GJPAA (Ruud) (ruud.baltissen_at_abp.nl)
Date: 2003-12-18 11:54:13

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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