Which MSX2 has the slowest VDP? Panasonic turbo-R and A1-WSX?

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Par sdsnatcher73

Prophet (3532)

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26-12-2021, 09:45

Well it is really good that you force yourself to make something that will work equally well on all hardware! You can of course use R800 on turbo R to allow for some extra features on these machines (I think that would be very welcomed by the community).

Par sd_snatcher

Prophet (3551)

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26-12-2021, 14:50

Bengalack wrote:

Thanks. This info is brilliant. I will test around here. This list is probably the list of the slowest MSX2s out there, then Smile

The Sony MSX2+ machines can have VRAM corruption if you access the VRAM too fast. I.e., this happens on the game Sim City.

This can be fixed with a hardware mod though.

Par sdsnatcher73

Prophet (3532)

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26-12-2021, 15:04

Is that issue only present on the XDJ or also on the XV? It seems to share the same components in those 4 positions…

Edit: ah, you wrote Sony MSX2+ machines Wink

Par Bengalack

Hero (606)

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26-12-2021, 19:37

sd_snatcher wrote:

The Sony MSX2+ machines can have VRAM corruption if you access the VRAM too fast

What is "too fast"?

I'm keeping myself within the limits mentioned here (yes I tried doing things faster, and things blew up Smile ):
http://map.grauw.nl/articles/vdp_tut.php#vramtiming

Par Bengalack

Hero (606)

Portrait de Bengalack

26-12-2021, 20:05

sdsnatcher73 wrote:

I have A1FM, A1FX, A1WSX (unsure which revision), A1ST if you want to test on real HW.

Thank you sdsnatcher73! --I might not be in urgent need though, as I just realized that a fellow closeby who has tested the game earlier, has a Sanyo PHC-70FD. That computer seems to be one of the slowest.

I need to test on more setups later though.

Par sdsnatcher73

Prophet (3532)

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27-12-2021, 14:10

Just reach out via e-mail if you want some help.

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