INT 10 - VIDEO - DISPLAY COMBINATION (PS,VGA/MCGA)
AH = 1Ah
AL = 00h read display combination code
Return: BL = active display code (see below)
BH = alternate display code
01h set display combination code
BL = active display code (see below)
BH = alternate display code
Return: AL = 1Ah if function was supported

Values for display combination code:
00h no display
01h monochrome adapter w/ monochrome display
02h CGA w/ color display
03h reserved
04h EGA w/ color display
05h EGA w/ monochrome display
06h PGA w/ color display
07h VGA w/ monochrome analog display
08h VGA w/ color analog display
09h reserved
0Ah MCGA w/ digital color display
0Bh MCGA w/ monochrome analog display
0Ch MCGA w/ color analog display
FFh unknown display type


101A - VIDEO - DISPLAY COMBINATION (PS,VGA/MCGA)