Hi MSXers,
>
> > Do you mean that 000000-3FFFFF can be used both for linear addressing
> >and memory mapping (MSX2 standard)?
>
>
> Yes
>
> Do You think on other?
>
I, myself, thought to make two separate memories.
When access below 64KB space, memory module A(4MB, memory mapper,
MSX2 standard) is accessed. Otherwise, memory module B(16MB or more
for Z380) is accessed. In other words, same physical memory location
is not accessed via two different address.
My approach wastes 64KB of memory module B. But it's possible to
use the space as usefull system memory.
Just one suggestion.
>
> > How about to use super I/O controller chip for PC?
> >
>
> Where to take a specification and chips themselves?
> That this gives?
>
There are several I/O controller chips for PC. I consider to use
PC87309 of National Semiconductor. It includes keyboard/mouse
controller, floppy disk controller, parallel and serial ports.
> Yes This is one variant. The Second variant when Z8 itself as PPI, it is
> more better.
>
OK. The second one is better. Complete compatibility to both side,
PPI and KBD.
Greetings,
- Jun.
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