
yeah, it was literally CMYK (magenta, cyan, yellow, black)

yeah, it was literally CMYK (magenta, cyan, yellow, black)
ok, white, magenta, cyan, black...
some more examples of this typical CGA display from those days (late 80s) https://www.mobygames.com/game/16195/galactic-conqueror/screenshots/dos/1064275/
My monitor was definitely capable of RGB. Windows 3.1.1 worked, full color in MS Paint, etc.
This was like 25+ years ago, so I don’t remember the details. Just that when I tried to play it in full color it was garbled and choppy. Monochrome worked though.