Framebuffer or standard VGA ?

Ronald G Minnich rminnich at
Wed Sep 11 10:40:00 CEST 2002

On Wed, 11 Sep 2002, Peter Stuge wrote:

> This is the case.  The way you reset a VGA card is to far call the real mode
> address 0xc000:3.  This is what the system BIOS does pretty early on, before
> saying anything to anyone looking at the screen.  Try starting debug.exe in
> MS-DOS and enter
> a 100
> call c000:3
> retn
> <blank line>
> g
> q

yes. we have code in linuxbios and a user-mode emulator to do this.

> Unfortunately, yes.
> The problem is that video BIOSes run in real mode and tend to rely on legacy
> system BIOS services.

I've done bits of it.


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