Bona Fide OS Development
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VGA VESA Screen Updates
http://forums.osdever.net/viewtopic.php?f=7&t=141
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Author:  Kieran [ Mon Feb 22, 2010 1:30 am ]
Post subject:  Re: VGA VESA Screen Updates

Im with Love4Boobies on this, I think UDI could become invaluable to the osdev community.

Author:  smeezekitty [ Mon Apr 26, 2010 5:34 pm ]
Post subject:  Re: VGA VESA Screen Updates

HELLO WORLD!
VESA basically switches modes so you can do direct memory access.
How is this slow?!?!?! :o :roll: :shock: :?

Author:  DudeOfX [ Wed Apr 28, 2010 8:47 am ]
Post subject:  Re: VGA VESA Screen Updates

I think its slow because of the way the memory banks are mapped... its not guarranteed to access all the video memory linearly... I remember when DirectX first came out, I remember they used a cheap trick, they used the CPU's General Protection Fault system to switch banks automaticaly... so to the programmers the video memory appears to be mapped linearly...

Author:  Kieran [ Thu Apr 29, 2010 2:56 pm ]
Post subject:  Re: VGA VESA Screen Updates

I remember messing with vesa aat low level before and there are so many deviations from the standards too. Not to mention the banking.

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