[Coco] SVGA monitor

[jdaggett at gate.net]

Torsten

I am not so sure of any mismatch in the output of the GIME chip or the buffers in the 
COCO3.

If Roy's circuit is taking the RGB signals from the COCO3 then the only part of the 
PAL/NTSC debate is the horizontal and vertical sync frequencies. Still that is a marginal issue 
in my opinion. As that sets the number of pixels (for lack of a better term) per line. PAL 
doubled HSYNC rate will still be slightly lower than that of doubled NTSC. I am not so sure 
that is a liability though. 

just some thoughts that may or maynot be worth the virtual paper in which it is written on.

james


On 18 Oct 2009 at 16:34, Torsten Dittel wrote:

> one reason for better PAL conversion quality might be: the ADC which is 
> digitizing the RGB channels (to provide them to the AverLogic (AL25x) 
> converter) works somehow better with the lower PAL frequencies. Maybe 
> NTSC behaviour could be improved by another external (analog) circuit 
> regarding the impedance matching (which might make the PAL quality 
> worse, so I'm not really interested in that change, LOL)
> 
> 
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