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Bunch of questions on FreeDos (VESA modes) (Users)

posted by RayeR Homepage, CZ, 11.07.2010, 02:28

> > > What modes does your VESA offer ? Is 1024x576 among them ?
> > Didnt yet figured out. I have EDID dump, but how can i tell what it
> means?
> > I will google that.
Hi,
here are my notes to some of your questions posted on BTTR
(I'm reading and replying offline)

1) Graphics scaling
Widescreen displays are pain for DOS use, this is also one
of the reason why I had bought my LCD panel with 1600x1200
native mode :) But there's a chance that if you have nVidia
graphics controller then it will be possible to turn off
the scaler and you will got nice 640x480 mode 1:1.
As your native mode is not so large it would fit well.
But if your netbook is lowcost model with intel integrated
graphics then it will not work - my utility directly depends
on nvidia proprietary VESA BIOS extension which it AFAIK not
available/is different on other videos.

2) VESA modes
You can try to use my VESATEST utility to analyze and test
available VESA modes. If you'll have a luck then your
VESA BIOS supports native widescreen mode and you will
be able to programm GUI things for it yourself.
Nvidia VESA BIOSes sometimes include widescreen modes...

3) Graphics acceleration
There's ANY HARDWARE STANDARD for 2D/3D acceleration
on modern graphics HW. You only got a piece of linear
memory (VESA LFB) where you can write directly graphics
data but no primitives, no transformations. VESA supports
only putpixel function but it's extremely slow so nobody
seriously use it. Forget VBE/AF, it's dead (usefull only
on very old graphics chips).

I hope I make it clear for you

Martin

---
DOS gives me freedom to unlimited HW access.

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