[Coco] RGB to XGA

[Bruce Borer]

Hi Allen,
This just takes the RGB colours as they are sent.  There is a PALETTE RGB
command in Basic that outputs original colour to the RGB port. I see there
is a  change but I do not think they are quite the same. This device has no
knowledge of artifacting so does nothing for it.

Another neat feature is that the device fits inside the pocket at the
bottom of the CoCo 3 near the RGB output.  It leaves the 15 pin DSUB (VGA)
connector facing out the back as if it was what Radio Shack intended.

Bruce

On Tue, Dec 23, 2025 at 9:54 PM Allen Huffman via Coco <coco at maltedmedia.com>
wrote:

> > On Dec 23, 2025, at 7:40 PM, Bruce Borer via Coco <coco at maltedmedia.com>
> wrote:
> >
> > Hi Allen,
> >    Converting composite to digital is more work than the PICO can do.
>
> Ah, let me clarify:  If you have a composite video in CMP mode, you get
> one set of colors.  If you have an RGB monitor and do RGB, you get another
> set.
>
> I wondered if your device would allow seeing the CMP colors on can XGA
> monitor, though I am not sure how the device would know which mode to
> present beyond a push button or something.
>
> This would be similar to how earlier VGA adapters could simulate the
> composite artifact colors. You could either get pure RGB colors, or go into
> the artifact mode and see the old CoCo 1/2 PMODE4 type graphics on a VGA
> monitor with red/blue or blue/red color sets — a very nice feature.
>
>                 — A
>
>
>
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