[Coco] RGB to XGA

[Allen Huffman]

> On Dec 23, 2025, at 4:45 PM, Bruce Borer via Coco <coco at maltedmedia.com> wrote:
> 
>   I just completed my first Raspberry Pi PICO project.
> It takes the RGB  from the CoCo 3 and converts it to
> XGA.  There were two pictures shows the difference
> between CoCo 3's RGB and CMP at Width 80 but they
> make the post too big. (I am new to posting here)
> There is more work to do and I will post more as I improve
> the conversion.
>   Currently the CoCo 3 RGB is 256 pixels wide with 192 lines
> when the Width is 32.  This expands to 400 pixels when width
> is 80.  Therefore I converted 400 pixels by 192 lines for all
> CoCo widths.  XGA is 800 x 600. To use as much of the screen
> I doubled the width of CoCo pixels and repeated each line twice.
>   When I learn to post a video with my daughter's help I will let
> the group know where to view it.
> 
> Bruce P. Borer
> 
> PS - If there is any interest of what I have done, post a reply.

I am aware of some video converter that uses the Pico to do something like this — I think I bought one and have it somewhere (though maybe not all the components).

Do you try to handle composite mode with CMP type colors, even going to the XGA monitor?

		— A