MSX Z80 replacement / new IC

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By hit9918

Prophet (2911)

hit9918's picture

31-10-2012, 02:12

"msx emulator inside a msx"
it would be funny if one could scramble the slots/subslots, e.g. make RAM in an unfortunate subslot location be seen as a primary slot, to work with troublesome apps. Then the chip would have to translate a simple out a8 instruction to multiple out A8 and write to FFFF.

By Leo

Paragon (1236)

Leo's picture

02-11-2012, 11:48

question:
- an "outir on port 98" or a "vdp command cpu to vram copy" translate into which frame rate , say in screen 5 ?

By PingPong

Prophet (3839)

PingPong's picture

02-11-2012, 12:31

Leo wrote:

question:
- an "outir on port 98" or a "vdp command cpu to vram copy" translate into which frame rate , say in screen 5 ?

6 fps

By NYYRIKKI

Enlighted (5899)

NYYRIKKI's picture

02-11-2012, 15:28

Leo wrote:

so what i understand is that a r800 upgrade for a regular msx-Z80 is more interesting.
i was thinking something way more faster than r800, for instance allowing new sw like mp3 decoding or
msx emulator inside a msx

We have already rMSX. Smile How ever it requires "DRAM mode" to be implemented, so you can add that to the wishlist. Even better is, if you can make it configurable, so that it just defaults to MSX tR implementation, but can be changed... Comes pretty close to "Scrambled slots" idea of hit9918.

By msxegor

Master (183)

msxegor's picture

04-05-2013, 13:13

Well if anyone wants a new CPU, I have VHDL code for 32-bit z80 compatible? tested on DE-1 in OCM setup
PS. No, I did not implement R800 multiplication (i have 8 and 16 bit Z180/Z380 style). But it's possible.
Anyoune who wants to test, can contact me for sources.

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