There's a "mode" if you will, on CGA cards, that involves something similar - best explained here: http://8088mph.blogspot.com/2015/04/cga-in-1024-colors-new-m

There's a "mode" if you will, on CGA cards, that involves something similar - best explained here: http://8088mph.blogspot.com/2015/04/cga-in-1024-colors-new-mode-illustrated.html http://8088mph.blogspot.com/2015/04/cga-in-1024-colors-new-m... If this hasn't already been featured on HN, I'd be surprised...