It's of some use; it lowers per-unit cart cost by putting it in the expanderrainwarrior wrote:Would some kind of IRQ be of any use? Or is that too much easier to just build into the cartridge?
You have A15 on the expansion connector, so you could practically just run traces A0-8 and R/W to EXP lines, and have the expansion device (the 16XDD) decode what ports do what.
Actually, that brings up a novel, but silly use of one EXP pin: giving A15 proper to the cartridge. This would also serve as a way to hard-require the device's installation for playing a game.