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 VGA VESA Screen Updates 
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Joined: Sat Jul 25, 2009 7:44 am
Posts: 274
Location: United Kingdom
Post Re: VGA VESA Screen Updates
Im with Love4Boobies on this, I think UDI could become invaluable to the osdev community.

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Kieran C G Foot


Mon Feb 22, 2010 1:30 am
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Joined: Tue Apr 20, 2010 1:39 pm
Posts: 17
Post 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: :?


Mon Apr 26, 2010 5:34 pm
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Joined: Sat Jul 25, 2009 9:15 am
Posts: 257
Post 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...


Wed Apr 28, 2010 8:47 am
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Joined: Sat Jul 25, 2009 7:44 am
Posts: 274
Location: United Kingdom
Post 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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Kieran C G Foot


Thu Apr 29, 2010 2:56 pm
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