[AT]
Expects: AX    8301H
                                                                  
Returns: AX    8300H
CF    NC (0) no error
CY (1) error; fn is busy
                                                                  
Info: Cancels the most recent timer interval set via INT 15H 8300H.

See Also: INT 15H (extended AT services)
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INT 15H 8301H: Cancel Event Wait Interval