INT 10 - VESA SuperVGA BIOS - GET CURRENT VIDEO MODE
AX = 4F03h
Return: AL = 4Fh function supported
AH = status
00h successful
01h failed
BX = video mode (see AX=4F02h)

See also: 104F02

104F03 - VESA SuperVGA BIOS - GET CURRENT VIDEO MODE