Int 16 Fn AF51 - K3plus V6.00+ (api V2.00+) - Set Options [K] AX = AF51h BX = 4B33h ('K3') CX = switchesReturn: AL = status 00h done CX = previous switch settings 01h switch not supported FFh other errorSee Also: AX=AF4Dh,AX=AF50h,AX=AF80h