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Values for switch settings on original EGA/VGA

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Value Settings

00h

primary MDA/HGC secondary EGA+ 40x25
01h - 03h primary MDA/HGC secondary EGA+ 80x25
04h primary CGA 40x25 secondary EGA+ 80x25 mono
05h primary CGA 80x25 secondary EGA+ 80x25 mono
06h primary EGA+ 40x25 secondary MDA/HGC (optional)
07h - 09h primary EGA+ 80x25 secondary MDA/HGC (optional)
0Ah primary EGA+ 80x25 mono secondary CGA 40x25 (optional)
0Bh primary EGA+ 80x25 mono secondary CGA 40x25 (optional)