How do I get GLQuake to run in 800×600 or 1024×768?
In order to run at 800×600 you must have a Voodoo2 card installed – Voodoo1 cards can’t exceed 640×480 in GLQuake. In order to run at 1024×768, you must have TWO Voodoo2 cards installed and linked together in SLI mode. Use one of the following commands to start GLQuake in either 800×600 or 1024×768: glquake.exe -width 800 -height 600 glquake.