INT 10 - VIDEO - Oak VGA BIOS v1.02+ - SET EMULATION
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
SeeAlso: AH=00h,AX=007Fh/BH=00h,AX=007Fh/BH=02h,AX=5F01h