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CGA supports a 16-color 160x100 graphics mode as a hack on the 16-color text mode. A few games used it, but not many. See http://tunneler.org/low-res/ http://
by thought_alarm 7y ago
CGA supports a 16-color 160x100 graphics mode as a hack on the 16-color text mode. A few games used it, but not many. See http://tunneler.org/low-res/ http://tunneler.org/low-res/
In this mode, if you use a dithering pattern you can generate 256 (16x16) dithered colors.
When connected to a composite monitor, the dithering pattern appears as a solid color, giving you 256 unique solid colors at a resolution of 80x100.
In a composite video signal, different pixel positions produce different colors, so if you shift the dithering pattern over by one pixel, you get an additional 256 colors.
The author was able to find four such dithering patterns, for a total of 1024 (256x4) colors. However, the last two dithering patterns (the last 512 colors) require some low-level hacking scan-line hacking.