Remember, this is CGA. Some games specifically take advantage of composite: https://en.wikipedia.org/wiki/Composite_artifact_colors
Likewise, remember that the monitor connector is digital. If you build an HDMI (or DVI, DisplayPort, whatever) converter, you're starting with a digital signal, not an analog one: https://en.wikipedia.org/wiki/Color_Graphics_Adapter#Specifi...
Remember, this is CGA. Some games specifically take advantage of composite: https://en.wikipedia.org/wiki/Composite_artifact_colors
Likewise, remember that the monitor connector is digital. If you build an HDMI (or DVI, DisplayPort, whatever) converter, you're starting with a digital signal, not an analog one: https://en.wikipedia.org/wiki/Color_Graphics_Adapter#Specifi...