[Coco] Re: Re: again: CoCo RGB to VGA conversion

[jdaggett at gate.net]

James

IN VGA,  the Coco already has the horizontal resolution in place. The 
problem is the number of lines per field. One can take the RGB analog 
signals and resample them at the higher line frequency and have an 
appropriate amount of video ram on board. The hardware would  have to 
take the  Coco field and add up to 120 border lines above and below the 
display area. In that manner you have 640x200 displayed on a 640x480 
monitor.

This is and has been done on many monitors. The one thing that I have 
found in reasearching VGA and monitor resolution is that there is no one 
standard. One video mode text document shows that there are over 128 
different video modes that monitors and video cards use. That does not 
include the VESA compliant modes. Going beyond VGA to SVGA,  XVGA 
and bey ond is a nightmare. 

james

 

On 23 Aug 2004 at 14:58, James Dessart wrote:

Date sent:      	Mon, 23 Aug 2004 14:58:41 -0400 (EDT)
From:           	James Dessart <james at skwirl.ca>
To:             	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
Subject:        	Re: [Coco] Re: Re: again: CoCo RGB to VGA 
conversion
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> 
> 
> On Mon, 23 Aug 2004 jdaggett at gate.net wrote:
> 
> > Showing a Coco 3 resolution graphics on a VGA screen will still
> > yield the same old graphics. It just wont fill up the whole screen.
> > There will be a significant upper and lower border of about 100
> > lines each.
> 
> Unless the converter scales it up, right? For instance, doubling the
> width and height of each pixel to fit a larger screen.
> 
> James
> 
> 
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