On Fri, 19 Mar 1999, Laurens Holst wrote:
> >> Maybe you mean the NMS 8220?
> >> That machine had only 64K RAM (normal memory mapper), but did still
> >> have 128K VRAM, like every MSX2 I've ever seen...
> >
> >How can 64kb of RAM be memory mapper? Memory Mapper with only 4 memory
> >blocks is a bit unuseful!
>
> NOT!!! With a non-memorymapped 64k RAM the blocks are on fixed adresses. If
> a small game for example executes from #C000, and it has the fielddata at
> #8000. Well if you include a music-replayer which uses the area #8000 for
> music-data, then you can switch the music-data to that adres with
> memory-mapped RAM, but you can't do that with non-memorymapped 64k RAM... So
> now you understand that 64k mapped and 64k fixed are not the same?
All right, I used to do some LDIRs, but now I see that the big deal is
some kind of "hardware data transfer". Conclusion: the utility is a "high
speed data transfer" between memory pages. I agree with you, it is useful,
but not too much.
Greetings from Brazil!
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