From: "Eric Ball"
> From: "Dennis Debro"
>
> > The memory map shows $400 - $47F and $500 - $17FF as "available".
> > Available for what?
>
> Those two memory ranges do not have anything mapped to them (i.e.
> TIA/MARIA/RIOT registers, RAM), so they could be used (with an appropriate
> address decoder) for other memory mapped devices (like an on cartridge
> POKEY).
For example the High Score Cartridge maps in it's 2K of battery
backed RAM at $1000-$17FF. The 4K HSC ROM is at $3000-$3FFF, BTW.
I know the 7800 software guide says that $2800-$3FFF is the same
as $2000-$27FF, but from my experience that isn't true. On all of
my 7800s the whole area at $2800-$FFFF is unused, allowing the
7800 to have linear cartridge ROM of up to 54K.
Ciao, Eckhard Stolberg
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