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Geek



Joined: 01 Jun 2005
Posts: 26
Geek
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?

Cool Question Cool

_________________
Death is not the opposite of life, rather, it is the absence of it.
Post 01 Jun 2005, 18:18
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u
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/
Post 01 Jun 2005, 20:45
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Adam Kachwalla



Joined: 01 Apr 2006
Posts: 150
Adam Kachwalla
Intel's graphics chipsets are documented here - http://www.intel.com/design/chipsets/Q965_Q963/documentation.htm
Post 07 Jul 2007, 01:42
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Mac2004



Joined: 15 Dec 2003
Posts: 313
Mac2004
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
Post 07 Jul 2007, 11:37
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Adam Kachwalla



Joined: 01 Apr 2006
Posts: 150
Adam Kachwalla
If you want quality graphics, you can start off with VESA, which allows 1600x1200 res. graphics
Post 09 Jul 2007, 10:34
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Adam Kachwalla



Joined: 01 Apr 2006
Posts: 150
Adam Kachwalla
I managed to stumble across this: VESA BIOS EXTENSION (VBE) Core Functions Standard

And believe it or not, it's free this time!
Post 15 Jul 2007, 00:00
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u
Cool thanks for the link Smile
Post 15 Jul 2007, 19:05
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