Message-ID: <8D53104ECD0CD211AF4000A0C9D60AE359823A@probe-2.acclaim-euro.net>
From: Shawn Hargreaves <ShawnH AT Probe DOT co DOT uk>
To: djgpp AT delorie DOT com
Subject: Re: Mouse in SVGA Mode
Date: Wed, 24 Feb 1999 17:11:00 -0000
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Reply-To: djgpp AT delorie DOT com

josepva AT informatica DOT TELERJ DOT net DOT br writes:
> I know that it's not a problem, I don't know why it works this way
> but it is the way that it should be. I know that 320x200 resolution 
> work in that way i don't know who is the other resolutions that it 
> happens, maybe you have to try by your own.

Be very careful about using this sort of try-it-and-see approach with
a mouse driver, because not all drivers are created equal. Some are
buggy, while others are just weird :-)

To the best of my knowledge, the current Allegro mouse code works 
correctly with any DOS mouse driver on any SVGA board, but the only
way I was able to do this is by using only the mickey motion counts
from the driver, and writing all my own code for tracking the 
position and displaying the cursor. Back when I was using the int 
0x33 functions to do these things, I was unable to find any method
that would work reliably for everyone.


	Shawn Hargraves.