On Wed, 5 Sep 2001, Steve Judd wrote:
> For what it's worth, the two cartridges do not need to occupy the same
> memory space and can coexist via a cartridge port expander like the EX-3.
Hmm, I thought that the Action Replay occupies both I/O1 and I/O2. I/O1
($de00-$deff) is for the write-only configuration register, and I/O2
($df00-$dfff) can be used for mapping in a 256-byte window of the on-board
ROM or RAM. When the cartridge is disabled, it of course won't occupy
either area, but the cartridge is enabled when the computer is powered on.
But this doesn't make it impossible to use the Action Replay and e.g. a
Commodore REU simultaneously if REU hardware is modified so that the
registers at $df00-$dfff do not respond to read access. Prlink allows
this; it configures the $df00-$dfff region of Action Replay as RAM. But I
guess most REU programs try to detect the REU by reading $df00-$dfff;
therefore, the hardware modification might not be very useful.
Marko
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