> To solve the mapper problem by hardware is very difficult: it's located
> inside the S1990 MSX-engine.
> But only software that read mapper ports (which is illegal!) will encounter
> the problem. Well-written software will work with large mappers on S1990
> machines.
Can anyone tell me EXACTLY, what document tells that reading mapper ports is
illegal?AFAIK both MSX2 technical data book and Yamaha's whitepapers on MSX2
computers
and S3527 and S1986 MPS MSX engine chips say that ports FC-FF are R/W.
Yes, I know the problem with poorly designed memory extensions, that don't support
reading of their mappers. Did the people try to save money on two extra chips?
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