Schematic?
This is still 15.7khz video, so converters (with a scan-doubler in there somewhere) will have to be used to get it on a VGA monitor.
Still, this is analogous to the RGB video on a CoCo3. Unfortunately as with the CoCo3, the composite artifacts relied on by most games
wouldn't work, but high quality composite and s-video can be derived from RGB, perhaps using one of Analog Devices ICs.
- Ed