Int 10 Fn 12 - Cirrus Logic BIOS V3.02 - Lcd Panel - En/disable Reverse [V] AH = 12h BL = 89h AL = new state (00h enabled, 01h disabled) See Also: AH=12h/BL=84h,AH=12h/BL=8Ah,AH=12h/BL=8Bh