Tiido wrote on 2024-04-28, 04:01:
When I added analog RGB out mod to my Toshiba T3200 so I can connect it to a TV, I left in a switch that lets all 64 colors pass without the brown fix bit, in case there is any software that lets all colors to be used over the 200 line mode of EGA. It is kind of a waste how things have turned out with the EGA color situation...
I often wondered why EGA/VGA cards that had reverse compatibility for other monitors like CGA/HERC didn’t just allow for “flicker dithering “ out of the box.
64 EGA colors in 320x200 would be easy to simulate on a CGA screen by just doing nearest neighbor (640x200 dither) or by flickering the pixel between 2 colors (30hz) which gives 88 simulated colors.
This technique of flickering was used since the 70’s on mono screens, even some gameboy software did it.
In the case of a 3rd party card the color simulation could be handled by the dac making a CGA screen appear to software like a 64 color EGA or a 4096 color “VGA” 320x200 monitor.
Honestly it’s sort of surprising IBMs original EGA card didn’t just handle things this way for 320x200 color modes