How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Emulation of old PCs, PC hardware, or PC peripherals.

How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby RayeR » 2009-1-13 @ 01:04

Hi,
maybe that someone who has LCD attached to DVI-D and use DOS find it usefull. I made two tiny utilities to control on-chip scaler. You can enable scaling to fit image on the screen or disable scaler to get 1:1 image (better for higher videomodes). Note: this doesn't change output resolution which is set for DVI-D - just disable scaler+add black border around.
http://rayer.ic.cz/programm/programe.htm#NVSC
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby Davros » 2009-1-13 @ 03:13

would that work in windows as some people have problems
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby RayeR » 2009-1-13 @ 04:49

This is primary for DOS and operating systems that can call realmode BIOS functions. But you don't need it in windows at all because nVidia drivers have this settings (on my 7900GT is scaler disabled and lower videomodes are passed directly). But under DOS or Linux/vesaFB you hadn't any control.
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby RayeR » 2009-1-13 @ 20:38

Hehe I wonder but it works even under my Windows XP SP3 NTVDM when I switch cmd to fullscreen.
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby dr.zeissler » 2017-10-05 @ 11:25

RayeR wrote:Hi,
maybe that someone who has LCD attached to DVI-D and use DOS find it usefull. I made two tiny utilities to control on-chip scaler. You can enable scaling to fit image on the screen or disable scaler to get 1:1 image (better for higher videomodes). Note: this doesn't change output resolution which is set for DVI-D - just disable scaler+add black border around.
http://rayer.ic.cz/programm/programe.htm#NVSC


this could be VERY! usefull for me, can I get it somewhere?
thx!

PS: but why a ATI cards chrystal-clear in DVI under plain Dos and low-res with no borders?
CPU: PII 133-333 MOBO: SNI-D981 RAM: 512- FDD: Dualfloppy 3,5"HD/5,25"HD - 3,5"HD - 5,25"DD ISA-Catweasel HDD: 2x40GB - DVD
ISA(3): Audician32-S2Dreamblaster - GusACE PCI(3): Monster3D- Intel NW AGP(1): Matrox G200 8MB
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby dr.zeissler » 2017-10-05 @ 19:51

thx, but it does not do, what I need.I think Nvidia added some sort of "antialiasing-filter" on the scaler that leeds to lowers-blurryness.
I need to turn of the antialiasing to get a clear and sharp lowers picture.
CPU: PII 133-333 MOBO: SNI-D981 RAM: 512- FDD: Dualfloppy 3,5"HD/5,25"HD - 3,5"HD - 5,25"DD ISA-Catweasel HDD: 2x40GB - DVD
ISA(3): Audician32-S2Dreamblaster - GusACE PCI(3): Monster3D- Intel NW AGP(1): Matrox G200 8MB
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby dr.zeissler » 2017-10-05 @ 22:10

Interesting point is, that while running windows200 and switch for some lowers scene-remakes of 68k intros,
the lowres seems fine to me, so why is 320x200 sharp and clear within started win2k and very blurry while running plain msdos?
CPU: PII 133-333 MOBO: SNI-D981 RAM: 512- FDD: Dualfloppy 3,5"HD/5,25"HD - 3,5"HD - 5,25"DD ISA-Catweasel HDD: 2x40GB - DVD
ISA(3): Audician32-S2Dreamblaster - GusACE PCI(3): Monster3D- Intel NW AGP(1): Matrox G200 8MB
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby superfury » 2017-10-07 @ 13:07

Perhaps a matter of emulation(win2k) with different upscaling(whole pixel doubling/tripling in integer ratios) vs real hardware output((S)VGA video card output being stretched by the monitor itself)?
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby dr.zeissler » 2017-10-07 @ 13:26

no, I was wrong, it's the same blurry-mess.
CPU: PII 133-333 MOBO: SNI-D981 RAM: 512- FDD: Dualfloppy 3,5"HD/5,25"HD - 3,5"HD - 5,25"DD ISA-Catweasel HDD: 2x40GB - DVD
ISA(3): Audician32-S2Dreamblaster - GusACE PCI(3): Monster3D- Intel NW AGP(1): Matrox G200 8MB
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby RayeR » 2017-10-08 @ 18:27

Hi, my website moved from ic.cz to g6.cz some years ago.
http://rayer.g6.cz/programm/programe.htm#NVSC
I tested and used it on a (nowdays very oldskool :) Nvidia 7600GS/7900GT and it works (VGA is still working and I don't need newer one) - I get a small image on center of my LCD monitor exactly 1:1. But maybe that nvidiots decided to remove such features (same as vbe3 refresh settings) from videobios on newer graphics cards...
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby dr.zeissler » 2017-10-09 @ 16:43

Thx, is it possible to disable the "soft focus" but get a fullscreen image ? (like ATI does on DVI out) ?
CPU: PII 133-333 MOBO: SNI-D981 RAM: 512- FDD: Dualfloppy 3,5"HD/5,25"HD - 3,5"HD - 5,25"DD ISA-Catweasel HDD: 2x40GB - DVD
ISA(3): Audician32-S2Dreamblaster - GusACE PCI(3): Monster3D- Intel NW AGP(1): Matrox G200 8MB
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby dr.zeissler » 2017-10-09 @ 16:44

I started a toppic on NV-forums in order to get an info what the blurryness causes.
CPU: PII 133-333 MOBO: SNI-D981 RAM: 512- FDD: Dualfloppy 3,5"HD/5,25"HD - 3,5"HD - 5,25"DD ISA-Catweasel HDD: 2x40GB - DVD
ISA(3): Audician32-S2Dreamblaster - GusACE PCI(3): Monster3D- Intel NW AGP(1): Matrox G200 8MB
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby RayeR » 2017-10-09 @ 17:42

AFAIK it's not possible or not documented, sorry.
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby dr.zeissler » 2017-10-09 @ 18:09

CPU: PII 133-333 MOBO: SNI-D981 RAM: 512- FDD: Dualfloppy 3,5"HD/5,25"HD - 3,5"HD - 5,25"DD ISA-Catweasel HDD: 2x40GB - DVD
ISA(3): Audician32-S2Dreamblaster - GusACE PCI(3): Monster3D- Intel NW AGP(1): Matrox G200 8MB
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby RayeR » 2017-10-10 @ 02:41

dr.zeissler wrote:let's see wht this toppic leads to.
https://forums.geforce.com/default/topi ... this-thx-/


I doubt that nvitiots will bother with some reply. I asked them about some documentation how to set refreshrate without vbios support and nobody replied.
Maybe you can find a LCD monitor with some magnify function that would not do blurry interpolation (if such feature exist).
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby dr.zeissler » 2017-10-11 @ 13:21

I'll check all my TFT's with DVI in order to check out if any better image-quality is possible.
CPU: PII 133-333 MOBO: SNI-D981 RAM: 512- FDD: Dualfloppy 3,5"HD/5,25"HD - 3,5"HD - 5,25"DD ISA-Catweasel HDD: 2x40GB - DVD
ISA(3): Audician32-S2Dreamblaster - GusACE PCI(3): Monster3D- Intel NW AGP(1): Matrox G200 8MB
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby RayeR » 2017-10-11 @ 13:40

The scaler in LCD is not involved as the VGA already scaled it for you. But i think that I have seen a LCD with magnify feature that allowed you to zoom a par of the screen that you defined but i don't remember what LCD brand it was...
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Re: How to disable on-chip scaling on nVidia VGA when using LCD monitor @DVI-D

Postby dr.zeissler » 2017-10-19 @ 06:39

I went back to i865gv due to the fact, that there is no real solution for my purpose.

In short:
- Nvidia: DVI-Output ugly, VGA output not centred !
- ATI: DVI-Output sharp, drivers and compatibility ugly! (Dos-Vesa, Win9x/Win2k drivers do crash my machine, black icons, freezes, argh! no way)
- Intel: VGA sharp and clear, dos-compatiblity excellent ! fast enough for retro-gaming (up to q3 enigine)

Doc
CPU: PII 133-333 MOBO: SNI-D981 RAM: 512- FDD: Dualfloppy 3,5"HD/5,25"HD - 3,5"HD - 5,25"DD ISA-Catweasel HDD: 2x40GB - DVD
ISA(3): Audician32-S2Dreamblaster - GusACE PCI(3): Monster3D- Intel NW AGP(1): Matrox G200 8MB
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