>>>>> "RB" == Ruud Baltissen <Ruud.Baltissen@abp.nl> writes:
MV> You'll have to work around the PLA though. Writes to the $8000-
MV> 9fff area are directed to the underlying RAM.
RB> Yes, but the data shows up at the expansion port as well. When
RB> _reading_ this area, the PAL enables ROML presuming EXROM is (L).
RB> When writing this area ROML is kept (H) to avoid busclashes. But
RB> what hinders you to make your own $8000/9FFF decoder for writes?
Nothing, but writes will still bleed through -- you'll write to the
external RAM as well as the internal RAM. This may or may not be a
problem.
--
___ . . . . . + . . o
_|___|_ + . + . + . . Per Olofsson, konstnär
o-o . . . o + MagerValp@cling.gu.se
- + + . http://www.cling.gu.se/~cl3polof/
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