On May 23, 2015, at 8:24 AM, Mark J. Blair <n...@nf6x.net> wrote:

> In the middle will be some FPGA to perform any necessary magic. I've been 
> looking at a prohibitively expensive ($115) one that has enough dual-port RAM 
> blocks to support a frame buffer.

Are you on the CoCo mailing list? Have you seen the RGB2VGA by Luis Antoniosi 
(CoCoDemus)? I know at one point he had been tinkering with making it support 
composite from the Apple II. It’s semi open-source, I think there are 2 
versions and the latest version is currently all closed source.

https://sites.google.com/site/tandycocoloco/rgb2vga

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