Function 0Dh            Reset Drive

    Flushes all file buffers. Any write operations that are buffered
    by DOS are performed, and all waiting data is written to the
    appropriate drive.

        Entry   AH = 0Dh

        Return  Nothing

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    Reset Drive does not update directory entries; programs must close
    changed files to ensure that the proper length of a changed file
    is recorded in the disk directory.

    This function is normally used by Ctrl-C interrupt handlers.