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Int 10h, 1A01h Set Display Combination Code MCGA, VGA
Informs BIOS of the type of display connected to the computer.
Entry AX = 1A01h
BL = Active display code (see function 1A00h
BH = Inactive display code for list of codes)
Return AL = 1Ah If function supported
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Note
This service sets BIOS's only indication of the type of display in
use and should be used only by systems software.