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Vol

03.02.2021, 15:54
 

Is there any support for standard BIOS video modes? (Developers)

I'm curious is there any development for FreeDOS, which allows to use old BIOS video modes on modern video cards, anywhere? It is sad that modern video cards can't easily be switched to use BIOS modes 4, 5, 6, 0xd, ... :(

Laaca

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Czech republic,
03.02.2021, 18:21

@ Vol
 

Is there any support for standard BIOS video modes?

> I'm curious is there any development for FreeDOS, which allows to use old
> BIOS video modes on modern video cards, anywhere? It is sad that modern
> video cards can't easily be switched to use BIOS modes 4, 5, 6, 0xd, ... :(

Yes, you are right. My Geforce RTX 2060 does not support CGA modes!!!
But to your question - the working solution is to use DosBox from DOS (see dedicated thread in this forum).
In pure theory could be _maybe_ possible to setup the CGA modes using direct port settings (without using BIOS services). I have somewhere a source for such setting for VGA modes. But I think (although not for sure) that it does not cover the CGA modes.

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DOS-u-akbar!

RayeR

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CZ,
05.02.2021, 18:40

@ Laaca
 

Is there any support for standard BIOS video modes?

BTW when you have quite new RTX 2060 how well it does under DOS/VESA? Do you have some other issues? CGA and 8x14 font is problem even on my old GTX 670.
I'm curious if they solved page flipping problem and if you have VESA mode for your native LCD resolution, you can try my vesatest and send results.

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DOS gives me freedom to unlimited HW access.

Laaca

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Czech republic,
06.02.2021, 11:57

@ RayeR
 

Is there any support for standard BIOS video modes?

I have not tested the 8x14 font yet as I don't use any application which uses this font.
About other problems I already wrote into your thread avout flipping problem.
http://www.bttr-software.de/forum/board_entry.php?id=15762#p16525

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DOS-u-akbar!

RayeR

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CZ,
09.02.2021, 00:34

@ Laaca
 

Is there any support for standard BIOS video modes?

> About other problems I already wrote into your thread avout flipping
> problem.

Uh, my problem that I don't check much often for years old threads as I use threaded view by default...

So it seems nvidia sucks even harder with every new model. Did you solved the scanline problem? It shouldn't be hard in own library but how about old SW? Is the strange scanline size reported for all BPPs (8 and 32 too)? VGA register incompatabilities sound scary, have it some link that cards (probably) use UEFI FW?

My GTX670 is dying, I did reballing of all 8 memory chips but some week ago I got artefects and OS freeze caused by GPU. I temporarly fixed it by reflow of GPU with hot-airgun but this will not last much long. So I ordered stencil for GPU reballing to be ready to give a try when it die again but this reball operation may result in permanent death. So I seek for some decent replacement. I dont's want go for anything newer than GTX 9x0 because those are the last with WinXP support. I heard that GTX 960 are quite trouble-less and not much heating due to better chip litography but this cards cannot be bought as new anymore and I cannot guess the condition of used card but probably no other way. I also hope that GTX 960 has not much VGA/VESA issues than 670...

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DOS gives me freedom to unlimited HW access.

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