INT 33H 0021H: Reset Mouse Driver

 Expects: AX    0021H
 Returns: AX    status: 0021H=success
                        ffffH=can't reset (no driver)
          BX    number of mouse buttons
    Info: This performs a "software reset" of the mouse support.  It sets
          all internal variables to their standard defaults, as described
          under INT 33H 0000H.

          This works like INT 33H 0000H except that it does not perform a
          reset of the mouse hardware or of any hardware-related variables
          (some older mouse hardware takes several seconds to reset).

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