Int 10 Fn FF - Video - Oak VGA BIOS V1.02+ - Set Emulation [V] AH = FFh AL = emulation 43h ('C') CGA emulation 45h ('E') EGA emulation 4Dh ('M') Hercules emulation 56h ('V') VGA emulation ES:DI -> signature string "Calamity" Return: VGA switched to suggested mode See Also: AH=00h,AX=007Fh,AX=5F01h