VBE3.0 protected mode interface
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matthias
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Re: VBE3.0 protected mode interface
Wow, good job. Unfortunatly the conclusion is not so good; VBE sucks :@:( A well I was planning a console OS anyway, just VBE for testing
The source of my problems is in the source.
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Da_Maestro
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- Posts: 144
- Joined: Tue Oct 26, 2004 11:00 pm
- Location: Australia
Re: VBE3.0 protected mode interface
Well...VBE in protected mode sucks!
Real mode and VM86 mode has to work because that's what windows and linux use to access VBE
Real mode and VM86 mode has to work because that's what windows and linux use to access VBE
Two things are infinite: The universe and human stupidity. But I'm not quite sure about the universe.
--- Albert Einstein
--- Albert Einstein
Re: VBE3.0 protected mode interface
no its not:
windows will never use RMode VBE (though i suspect winXP does use vbe3 -- in PMode)
if you lack specific drivers, (in win9x) you cannot use more than VGA (which is fully standardized -- easy to do in PMode)
winXP however, can use higher modes, though im not sure how, i suspect it does use vbe2/3 PMode interfaces, though i cannot be sure of that (some modes beyond VGA can be set the same as the VGA modes -- not all cards will except it, but many/most will-- and winXP might use this (like win3.1 did -- win3.1 supported 'generic' 640x480x8 & 800x600x4 -- without any vbe -- but it wouldn't work on some controllers, but most did)
windows will never use RMode VBE (though i suspect winXP does use vbe3 -- in PMode)
if you lack specific drivers, (in win9x) you cannot use more than VGA (which is fully standardized -- easy to do in PMode)
winXP however, can use higher modes, though im not sure how, i suspect it does use vbe2/3 PMode interfaces, though i cannot be sure of that (some modes beyond VGA can be set the same as the VGA modes -- not all cards will except it, but many/most will-- and winXP might use this (like win3.1 did -- win3.1 supported 'generic' 640x480x8 & 800x600x4 -- without any vbe -- but it wouldn't work on some controllers, but most did)
Last edited by JAAman on Thu Mar 02, 2006 12:00 am, edited 1 time in total.
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Da_Maestro
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- Joined: Tue Oct 26, 2004 11:00 pm
- Location: Australia
Re: VBE3.0 protected mode interface
Windows NT and Linux Svgalib use VM86 to access the real mode VBE interface.
Linux I'm sure of. The svgalib source code is readily available.
Windows: Like you I'm not sure...I saw a document on the web from a project that was trying to run WinXP on bochs and they mentioned something about VM86 and VBE...I'll have to find it again and post a link for you. I do remember it saying something about using VM86 VBE to determine what device was attached...
Linux I'm sure of. The svgalib source code is readily available.
Windows: Like you I'm not sure...I saw a document on the web from a project that was trying to run WinXP on bochs and they mentioned something about VM86 and VBE...I'll have to find it again and post a link for you. I do remember it saying something about using VM86 VBE to determine what device was attached...
Last edited by Da_Maestro on Thu Mar 02, 2006 12:00 am, edited 1 time in total.
Two things are infinite: The universe and human stupidity. But I'm not quite sure about the universe.
--- Albert Einstein
--- Albert Einstein
Re: VBE3.0 protected mode interface
XP problably closed some deal with the hardware manufactures to get info for the basic modes. *guessing*