0040h:0017h           Shift Status

    Length: 1 byte


                Shift Status

                7 6 5 4 3 2 1 0
                x . . . . . . .      Insert locked
                . x . . . . . .      Caps Lock locked
                . . x . . . . .      Num Lock locked
                . . . x . . . .      Scroll Lock locked
                . . . . x . . .      Alt key is pressed
                . . . . . x . .      Ctrl key is pressed
                . . . . . . x .      Left Shift key is pressed
                . . . . . . . x      Right Shift key is pressed