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
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