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Int 10 Fn 12 - Video - Alternate Function Select (ps, EGA, VGA, Mcga) - [V]
AH = 12h
BL = 10h
Return: BH = 00h color mode in effect (I/O port 3Dxh)
01h mono mode in effect (I/O port 3Bxh)
BL = installed memory (00h = 64K, 01h = 128K, 02h = 192K, 03h = 256K)
CH = feature bits
CL = switch settings
bit 0: switch 1 OFF
bit 1: switch 2 OFF
bit 2: switch 3 OFF
bit 3: switch 4 OFF
bits 4-7: unused
Note: one possible check for the presence of an EGA or later display card
is to call this function with BH=FFh; if not present, BH will be
unchanged on return
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