:Why not? After all, the slot expander is switched using memory mapped I/O
:at $FFFF. MSX1 can do that as well.
:Note that the MSX1 BIOS doesn't support slot expansion, though. Which means
:that only cartridges in the first subslot will be recognized by the BIOS.
:But if you program the hardware directly, you can access the other
:subslots. And if you use a slot expander only to turn on/off the cartridge
:(what this message was about), it's good enough if you can access only 1 of
:the 4 subslots.
There are adresses in the system-area of the MSX1 to indicate if a slot is
expanded... (#FCC1)
~Grauw
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