Date: Wed, 24 Mar 1993 22:01:03 -0700
From: tesla AT lamar DOT ColoState DOT EDU (Jon Nash)
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Simple video question


I've been getting up to speed with DJGPP by trying out some of the different
functions available for text and graphics manipulations.  I have a problem
with the graphics.

I have a video card with a Trident chip on it (hardware isn't my strong suit)
and some of the programs on the utilities disk that came with it make me think
that the tridnt89.grd driver should be the one that I use when I write in my
autoexec.bat file:
  set GO32=driver d:\djgpp\drivers\tridnt89.grd

When I do this and then use GrMaxX() and GrMaxY() they return 639 and 479
respectively, after using GrSetMode(GR_default_graphics,0,0).  However,
when I draw a line (a short line) I run into severe problems!  If the line
is short enough it may appear on the screen (I can draw a line using
GrLine(10,10,80,10,4)) and it appears on the screen, but it is about an inch
from the bottom of screen instead of an inch from the top!  When I hit a key
to satisfy kbhit() I set the screen back to the default text screen, but
the screen blanks out and the computer hangs - no warm boot!  I have to cold
boot the system after that.  I have every possible combination of drivers
and such and I just can't get the 640X480 resolution to work (320X200) with
256 colors works fine.  I realize that go32 only supports 256 color modes,
but my card claims (and a utility that came with the card proves) that it
supports 640X480 256 colors among others.

Any hints would be greatly appreciated!

Also, supposing that I ever get this to work with, say, the driver
tridnt89.grd will I have to take a copy of that driver with go32 and the
"exicutable" when I want to run it on another computer?

Thanks in advance for you help

Jon Nash
Tesla AT Lamar DOT ColoState DOT EDU