TFMSX

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By PingPong

Prophet (3793)

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26-10-2021, 20:03

would be good if they will connect the VDP WAIT pin in order to get the maximum datarate without the usual sloppy workaround to clock z80 @3.58Mhz.

By ArkadiuszMakarenko

Supporter (14)

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26-10-2021, 22:59

I might be wrong, but I think goals of this project are simply to recreate msx2, and allow cheaper alternatives to orginal MSX2 without use of fpga?
I don't think improvements are considered?

By ArkadiuszMakarenko

Supporter (14)

ArkadiuszMakarenko's picture

27-10-2021, 18:47

By PingPong

Prophet (3793)

PingPong's picture

27-10-2021, 21:18

For improvements i'm thinking a faster clock.
Back in the days a lot of workaround were tried to synchronize z80 vdp . a lot of these were sloppy. The worst case is the delay that is inflicted to the R800, while the correct way to handle this is the v9958 wait signal that allow async processing and maximum performances based on the vdp working status.

Considering that the v9958 is used here and maybe could be sourced easily than v9938 i think that a simple connection between two pins is not a big improvement. If i'm not wrong the omega msx did it already

By karloch

Prophet (2147)

karloch's picture

31-10-2021, 10:40

If I recall correctly from the forum thread, the TFMSX is not implementing 12v on the slots, maybe he can get some advice on how to get it Smile

From https://www.exxoshost.co.uk/forum/viewtopic.php?f=65&t=4057

Quote:

Remaining unknowns..

1. Do carts really need +12V and -12v and if so how to get those out nicely off a 5V supply. (probably not)
2. Are there any hobby cases that would be worth looking into supporting/fitting into.

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