0:496h                   Keyboard Status and Type Flags

 Length: 1 byte

    This byte holds keyboard status information.

                      Keyboard Status Information

            7 6 5 4 3 2 1 0
            x . . . . . . .       Read ID in progress
            . x . . . . . .       Last character was first ID character
            . . x . . . . .       Force Num Lock if read ID and KBX
            . . . x . . . .       101/102-key keyboard installed
            . . . . x . . .       Right Alt key is pressed
            . . . . . x . .       Right Ctrl key is pressed
            . . . . . . x .       Last code was E0 Hidden Code
            . . . . . . . x       last code was E1 Hidden Code

    Use INT 16h, Service 12h, to obtain some of this information.

    Addresses 0:417h and 0:418h also contain keyboard status information.