VESA vs VGA

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BPearl
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VESA vs VGA

Post by BPearl »

Hi friends,
I want to develop a video driver for protected mode.
My doubts are the following:

1. Can we use VGA functions in P-Mode?
2. What is the difference between VGA and VESA?
3. Is there any difference between a VESA and a video driver?

Thanks in advance for reply
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gzaloprgm
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Re: VESA vs VGA

Post by gzaloprgm »

Can we use VGA functions in P-Mode?
Not directly. Indeed, you can reprogram video controller to enter some mode. Check "Video registers" in the wiki: http://wiki.osdev.org/VGA_Hardware
2. What is the difference between VGA and VESA?
VESA is the company. VGA is the resolution.

With VBE (vesa bios extension) you can have higher resolutions (AFAIK up to 1440 x something) while vga is 640x480x16colors.
3. Is there any difference between a VESA and a video driver?
A vesa?!

Cheers
Gonzalo
Visit https://gzalo.com : my web site with electronic circuits, articles, schematics, pcb, calculators, and other things related to electronics.
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Combuster
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Re: VESA vs VGA

Post by Combuster »

Please do your homework and follow the rules
"Certainly avoid yourself. He is a newbie and might not realize it. You'll hate his code deeply a few years down the road." - Sortie
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