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INT 5C - NETBIOS INTERFACE
        ES:BX -> Network Control Block (see below)
Return: AL = status
            00h successful
            01h bad buffer size
            03h invalid NETBIOS command
            05h timeout
            06h receive buffer too small
            08h bad session number
            09h LAN card out of memory
            0Ah session closed
            0Bh command has been cancelled
            0Dh name already exists
            0Eh local name table full
            0Fh name still in use, can't delete
            11h local session table full
            12h remote PC not listening
            13h bad NCB_NUM field
            14h no answer to CALL or no such remote
            15h name not in local name table
            16h duplicate name
            17h bad delete
            18h abnormal end
            19h name error, multiple identical names in use
            1Ah bad packet
            21h network card busy
            22h too many commands queued
            23h bad LAN card number
            24h command finished while cancelling
            26h command can't be cancelled
            FFh NETBIOS busy
Note:   Sytek PCnet card uses DMA 3.
SeeAlso: INT 5B

Format of Network Control Block:
Offset  Size    Description
 00h    BYTE    ncb_command (see below)
 01h    BYTE    ncb_retcode
 02h    BYTE    ncb_lsn
 03h    BYTE    ncb_num
 04h    DWORD   -> ncb_buffer
 08h    WORD    ncb_length
 0Ah 16 BYTEs   ncb_callname
 1Ah 16 BYTEs   ncb_name
 2Ah    BYTE    ncb_rto
 2Bh    BYTE    ncb_sto
 2Ch    DWORD   -> ncb_post     /* int (far *ncb_post)(); */
 30h    BYTE    ncb_lana_num
                00h-03h IBM NetBIOS specs
                F0h-FFh Eicon NABios interface
 31h    BYTE    ncb_cmd_cplt
 32h 14 BYTEs   ncb_reserve

Values for "ncb_command" field in NCB (or with 80h for non-waiting call):
        10h start session with NCB_NAME name (call)
        11h listen for call
        12h end session with NCB_NAME name (hangup)
        14h send data via NCB_LSN
        15h receive data from a session
        16h receive data from any session
        17h send multiple data buffers
        20h send unACKed message (datagram)
        21h receive datagram
        22h send broadcast datagram
        23h receive broadcast datagram
        30h add name to name table
        31h delete name from name table
        32h reset adapter card and tables
        33h get adapter status (see structure "astatus" below)
        34h status of all sessions for name (see structure "sstatus" below)
        35h cancel
        36h add group name to name table
        70h unlink from IBM remote program (no F0h function)
        71h send data without ACK
        72h send multiple buffers without ACK
        78h find name
        79h token-ring protocol trace

Format of structure "name":
Offset  Size    Description
 00h 16 BYTEs nm_name
 10h    BYTE  nm_num
 11h    BYTE  nm_status

Format of structure "astatus":
Offset  Size    Description
 00h  6 BYTEs as_id
 06h    BYTE  as_jumpers
 07h    BYTE  as_post
 08h    BYTE  as_major
 09h    BYTE  as_minor
 0Ah    WORD  as_interval
 0Ch    WORD  as_crcerr
 0Eh    WORD  as_algerr
 10h    WORD  as_colerr
 12h    WORD  as_abterr
 14h    DWORD as_tcount
 18h    DWORD as_rcount
 1Ch    WORD  as_retran
 1Eh    WORD  as_xresrc
 20h  8 BYTEs as_res0
 28h    WORD  as_ncbfree
 2Ah    WORD  as_ncbmax
 2Ch    WORD  as_ncbx
 2Eh  4 BYTEs as_res1
 32h    WORD  as_sespend
 34h    WORD  as_msp
 36h    WORD  as_sesmax
 38h    WORD  as_bufsize
 3Ah    WORD  as_names
 3Ch 16 name structures  as_name

Format of structure "sstatus":
Offset  Size    Description
 00h    BYTE    number of sessions being reported
 01h    BYTE    number of sessions with this name
 02h    BYTE    number of outstanding receive datagrams
 03h    BYTE    number of outstanding ReceiveAnys
 04h    var     session structures (see below)

Format of structure "session":
Offset  Size    Description
 00h    BYTE    local session number
 01h    BYTE    state
                01h listen pending
                02h call pending
                03h session established
                04h hangup pending
                05h hangup done
                06h session aborted
 02h 16 BYTEs   local name
 12h 16 BYTEs   remote name
 22h    BYTE    number of outstanding receives
 23h    BYTE    number of outstanding sends/chainsends