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High Resolution Screen Modes
Posted: Mon Aug 25, 2003 11:00 pm
by SquattyDog
I have already accomplished a simple, low-resoultion GUI for my OS. I have scoured my BIOS and video card mauals but haven't had any success in finding out how to enable high-resolution screen modes on my video card. Does anyone know how I would go about enabling a hi-res modes on a video card? If you have information on a specific card that would be useful too. Thanks for your help.
RE:High Resolution Screen Modes
Posted: Mon Aug 25, 2003 11:00 pm
by Stefan
Ralf Brown's Interrupt list
If you have a recent (8 or so years) video card, you want VESA VBE.
RMode Interrupt 0x10, AX = 0x4F00.
It even comes with drawing primitives (line, circle, etc.)!
And bochs supports it.
SVGALib and XFree86 Driver "VESA", if you're using GNU/Linux.
Web RBIL:
http://www.ctyme.com/intr/rb-0273.htm
RE:High Resolution Screen Modes
Posted: Mon Aug 25, 2003 11:00 pm
by Sentient
I have a FX5200 (Geforce FX) NVidia based card, and, to be honest, VBE is really not an option for it.
When I list all the supported modes, there are no 1024x768 modes.
RE:High Resolution Screen Modes
Posted: Thu Aug 28, 2003 11:00 pm
by tom1000000
VBE is disappearing as a standard, I don't think its worth the effort of supporting it.
Its clumsy and was primarily designed for real mode eg MS-DOS. There's no need for it as far as graphics chip manufacturers are concerned, because they Windows drivers instead.
Better off lookin at the Linux code and writing proper drivers for your graphics card. Maybe more difficult but you get much better performance.