Expects: AH    01H
DL    drive: 00H thru 03H for diskette drives
80H or 81H for hard disk controller
                                                                  
Returns: AH    BIOS disk error code of most recent operation (0=no error)
(this error code is also at 0040:0041).
                                                                  
Info: Obtains the error/status code of the most recent disk I/O
operation.

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INT 13H 01H: Query Disk Error Status