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By st1mpy

Paladin (870)

st1mpy's picture

19-02-2010, 19:39

can it be used? (enabled?)

By Leo

Paragon (1236)

Leo's picture

19-02-2010, 20:30

i dont know , i try to find out , i wonder why they say it has been disabled for compatibility purpose.
on Z180 , the DMA controls are on I/O map 30h to 3fh , i dont know where they are on R800

By AuroraMSX

Paragon (1902)

AuroraMSX's picture

20-02-2010, 09:08

Well simultaneous access could be done thanks to the use of slots/mapper , since Z80 accesses only 64kb at
the same time , there could be a 16kb page accessed by Z80 and then by VDP , not simultaneous but shared,
preferably it could be static ram that does not require refresh from Z80 or VDP. it might fit into the extended vram
between 128kb to 192kb.

I guess ADVRAM is what you're looking for, then...

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