INT 33H 001fH: Deactivate Mouse Driver

 Expects: AX    001fH
 Returns: AX    status: 001fH=deactivated OK
                        ffffH=can't deactivate
          ES:DX address of previous INT 33H handler
    Info: This deactivates the mouse driver.  All interrupts used by the
          mouse support are disabled, effectively eliminating all mouse

          Use INT 33H 0021H to re-enable all interrupts used by the mouse

          Note that the INT 33H vector remains in place, but the only
          function it can perform is INT 33H 0021H (to re-enable).

          You might call this just before replacing the mouse support with
          your own system of interrupts and kludges.  Then use the return
          value in ES:DX to reinstall the previous INT 33H code at some
          later time (i.e., when you exit to DOS).

See Also: INT 33H: Mouse Support
          Interrupts and BIOS Services