OpenEuphoria

Re: SVGA

• Posted by Falkon <Falkn13 at IBM.NET> Jun 13, 1998
• 1020 views

From:    Alan Tu
>This is supposed to get you into SVGA mode.  However, my problem is that
>I can't seem to use the entire screen in this mode.

From:    Lewis Townsend
>I have this same problem in modes 256, 257 and on up:
>The graphics only appears on a strip of stcreen at the top only
>about an inch and a half wide (about 4 or 5 cm) and wraps vertically
>over itself.

1.  call use_vesa(1) before making any graphics calls
if that doesn't fix it,
2.  Run a pc diagnostics program to find out what company brand/chipset of
video card you have. (if you don't already know)  Go to that manufacturer's
web page and look for a DOS-mode VESA VBE driver for that chipset/card.

     A lot of svga cards require driver programs to use svga modes in DOS.
Since computers come with Win95 now, which has built-in drivers, most pc
makers don't bother including the DOS drivers, hoping that you'll never try
to use DOS and discover that they left out important system software.  Most
video-card makers have the necessary drivers freely available for download
though.
Alternatively, you could use Sci-tech's Display Doctor, it works with a lot
of different cards.  Or if you've got a DOS-mode SVGA game that works fine
on your system, you probably already have the driver you need somewhere in
the game's disk/directories.

Hope that helps...fixed the problem for me.