Hello,

Hey, I really need some help.
I am writing my own OS, and I want it to use high quality
graphics -(GUI based). My problem though is that I cant figure out
how to access video memory in protected mode, well I want to be able to tap into memory greater then 256k of memory located at the usual 0xbfff to 0xAfff and still display it on screen. I also would like to use DMA to access the VRAM.

Can anyone help me to figue this out?

Go here: http://board.flatassembler.net/topic.php?t=2164&start=50
and get my compo entry called "CdPod" it has high quality graphics and runs in pmode and is only 512 bytes in size and come with fasm code, it may help.
Note: I was called "ASHLEY4" then.

Also you can take a look at "Dex4u" a OS a team of us are working on.
http://falconrybells.co.uk/

Intel's graphics chipsets are documented here - http://www.intel.com/design/chipsets/Q965_Q963/documentation.htm

Have you considered using Linear Frame Buffer (LFB)? LFB allows you to access flat video memory while in protected mode.

regards,
Mac2004


http://en.wikipedia.org/wiki/VESA_BIOS_Extensions

If you want quality graphics, you can start off with VESA, which allows 1600x1200 res. graphics

I managed to stumble across this: VESA BIOS EXTENSION (VBE) Core Functions Standard

And believe it or not, it's free this time!

Cool thanks for the link