AH = 59h
        BX = version code (0000 for DOS 3.0)
Return: AX = extended error code
        BH = class of error
        BL = suggested action code
        CH = locus (where error occurred)
Error codes:
        01 function number invalid
        02 file not found
        03 path not found
        04 too many open files
        05 access denied
        06 invalid handle
        07 memory control block destroyed
        08 insufficient memory
        09 memory block address invalid
        0A environment invalid
        0B format invalid
        0C access code invalid
        0D data invalid
        0F invalid drive
        10 attempted to remove current directory
        11 not same device
        12 no more files
        13 disk write-protected
        14 unknown unit
        15 drive not ready
        16 unknown command
        17 data error (CRC)
        18 bad request structure length
        19 seek error
        1A unknwon media type
        1B sector not found
        1C printer out of paper
        1D write fault
        1E read fault
        1F general failure
        20 sharing violation
        21 lock violation
        22 disk change invalid
        23 FCB unavailable
        24-31 reserved
        32 Network request not supported (DOS 3.1 + MS Networks)
        33 Remote computer not listening
        34 Duplicate name on network
        35 Network name not found
        36 Network busy
        37 Network device no longer exists
        38 Network BIOS command limit exceeded
        39 Network adapter hardware error
        3A Incorrect response from network
        3B Unexpected network error
        3C Incompatible remote adapter
        3D Print queue full
        3E Queue not full
        3F Not enough space to print file
        40 Network name was deleted
        41 Network: Access denied
        42 Network device type incorrect
        43 Network name not found
        44 Network name limit exceeded
        45 Network BIOS session limit exceeded
        46 Temporarily paused
        47 Network request not accepted
        48 Print/disk redirection paused (DOS 3.1 + MS Networks)
        49-4F reserved
        50 file exists
        51 reserved
        52 cannot make directory
        53 fail on INT 24h
Error Classes:
        01 out of resource
        02 temporary situation
        03 authorization (denied access)
        04 internal
        05 hardware failure
        06 system failure
        07 application program error
        08 not found
        09 bad format
        0A locked
        0B media error
        0C already exists
        0D unknown
Suggested Action:
        01 retry
        02 delayed retry
        03 prompt user
        04 abort after cleanup
        05 immediate abort
        06 ignore
        07 retry after user intervention
Error Locus:
        01 unknown or not appropriate
        02 block device
        03 network related
        04 serial device
        05 memory related
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