gglabs CGA2RGB capture tests through StarTech vga2hdmipro scaler
41EDIT: Leaving this video up for posterity, but I've since discovered the RGB2HDMI project which is effectively perfect and totally eclipses what I was able to put together here. I'll make a video over on The Oldskool PC sometime talking all about it after April 2022.
A commenter tried to leave a comment on the MCE2VGA. Don't buy or build that, it's garbage. It has fixed scaling, fixed framerates, it doesn't capture overscan, and costs too much.
Old description remains:
I think I finally have a working CGA RGB TTL video capture process. There are some quirks to work out, such as scaler issues producing moire patterns, but the moire is very subtle and is just about acceptable. Some of the colors are not quite what my 5153 produces, but they are extremely close and acceptable.
The various screens displayed are me walking through some test plates I added to The CGA Compatibiliy Tester specifically for calibrating capture equipment. More info on The CGA Compatibility Tester: http://www.oldskool.org/pc/cgacomp
The gglabs CGA2RGB converts TTL to analog RGB out, nothing more. You still need a line doubler, scaler, or capture device to make sense of the VGA output, unless you have a VERY old monitor that can handle 15.7 KHz horizontal input. More info about the gglabs device: http://gglabs.us/node/1619