> It seems stupid, but mapper ports aren't read/write... just write. The
> confussion is that most MSX2 and other computers has also the read
> option, but it's not standart.
You are wrong. Mapper ports _ARE_ R/W - this is stated in all official
technical papers. If the computer or memory expansion doesn't support
mapper readback, it doesn't conform to MSX2 standard. Unfortunately
there seem to be lots of such hardware
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