>> For example, it's very useful for accessing the entire RAM using only the
>> #8000-#BFFF segment.
>
>My MSX2 has 64kb of standard RAM and to access other pages I used to do
>some LDIRs (i.e., I can handle that).
1. LDIRs are slow (OUT takes 11 ticks, LDIRing 16k takes, ummm, a LOT of
ticks)
2. If you do what you suggest then the memory in page #8000 can't be used
for it has to be used as a temp-page. So when 'emulating' 64k of mapped ram
on 64k of non-mapped RAM you get (in the most optimistic case, so only when
using one page for mapping) a VERY slow 48k RAM mapper.
>> And DOS2 *needs* the memory to be mapped in order to manage the RAM
properly.
>
>And does DOS2 work with 64kb of Memory Mapper?
No. Minimal 128k.
~Grauw
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