[Lancelot] VGA clk

H. Peter Anvin hpa at zytor.com
Wed Feb 23 10:49:54 PST 2005

Tommy Thorn wrote:
> All that said, Lancelot still holds mysteries to me.  The blanking 
> facility of the DAC didn't work for me; I just got a purple (?) frame 
> around the screen.  I could only get color space configuration 0 to work 
> usefully.  Finally, pardon me for not checking the schematics, but are 
> only the RGB values delayed by 8 cycles?  If all signal through the DAC 
> see this delay then that would explain why I could see a difference.

I believe that is correct.  In particular, the sync signals DO NOT 
change (that's why you end up having a shift at all... if they all 
shifted, you wouldn't notice.)


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