From: Philippe Detournay 
Subject: Re: VESA video modes
 
The true answer is : "it depends".
The problem with VESA is that all the graphics cards are differents.
On my cirrus logic, i need to poke 3 bytes per pixel, and on the Matrox of
a friend of mine, i need to poke 4 bytes per pixel...
 
You can know all the details of the graphic card by calling the function 0 
(for
 
the card) and
1 (for the screen mode in bx).
I have the full details in a text file, called vesasp.txt, i don't remember
where you can find it, so
just e-mail me and i'll reply it to you.
 
Have a look to the Ralph Brown's interrupt list at
http://www.ctyme.com/rbrown.htm
It contains the full info of all the dos interrupts, go to int 10h
 
Note : i suppose the 4byte/pixel mode is for speed, because it's much faster
for the computer
to poke 2bytes at a time and btw 4 is faster than 3
 
 
KB a *crit:
 
> >
>
> Wow, does this mean that 24bit mode is actually 32bit?
>
> KB
 
 
 
--
Philippe
 
"Pourquoi  y a-t-il  quelque chose  au  lieu
de rien, et pourquoi ce qui est est-il ainsi
et non pas autrement?"
 
 
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