MSX-VIDEO with dedicated 4 MB Mapper ...

By Yukio

Paragon (1541)

Yukio's picture

22-11-2014, 19:53

It is possible to assembly a 256KB,512KB,1024KB,2048KB or even a 4096KB Mapper into the VDP ...
Using a MMS (Memory Mapper System) to access the 16KB pages!
Running Naked in a Field of Flowers

Login or register to post comments

By Dreamerm42

Hero (621)

Dreamerm42's picture

22-11-2014, 20:29

umm only 192kbytes max in vpd msx and msx2+?

Creo que solo se podian montar 192kbytes maximo en esas vdps

By Grauw

Enlighted (8015)

Grauw's picture

22-11-2014, 20:50

It should be possible with some extra logic between the VDP and the VRAM. Just like RAM can be memory mapped, no real reason why VRAM couldn’t be. Note that KdL’s One Chip MSX core has support for VRAM memory mapping.

Though personally, I think 128K is enough, and it’s difficult to expand existing machines so if you make software for it most machines won’t support it. Not a very appealing thought to me.

By o.geerdink

Hero (526)

o.geerdink's picture

22-11-2014, 22:18

Once there is useful software for it people will expand their vram??

But I'd rather see a cartridge with 16 bit memory mapper for plain RAM. Or maybe even better, a RAM extension that serves as VRAM and normal RAM, DMA from z80 to vram and vice versa as in a CPC Amstrad.

By Lord_Zett

Paladin (807)

Lord_Zett's picture

22-11-2014, 23:11

it easy to ad a extra 64k. but its not usefull you cant show it onscreen you cant use it in basic