Int 10/AX=5F54h

AX = 5F54h
BL = new state
00h on
01h off

Return:
AL = 5Fh if function supported
AH = status
00h unsuccessful
01h successful

See Also: AX=5F50h - AX=5F51h - AX=5F53h - AX=5F5Ah

Category: Video - Int 10h - C