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INT 7F - Telebit ACS SERIAL I/O
        ES:SI-> parameter block
Return: CF set on error
        CF clear on success
Notes:  the signature "PDGATEWRKSTNIF" appears just prior to the interrupt
          handler; this serves as the installation check

Format of Telebit ACS parameter block:
Offset  Size    Description
 00h    BYTE    command
                    3Ch status
                    3Dh connect
                    3Eh disconnect
                    3Fh read
                    40h data/command write
                    41h clear receive buffer
                    42h get configuration
                    43h get receiver status
                    44h raw write
                    45h search servers
                    46h set transmit buffer size
 01h    BYTE    gateway number
 02h    BYTE    reserved
 03h    BYTE    port
 04h 17 BYTES   auxiliary buffer
 15h    BYTE    session
 16h    WORD    count of bytes passed to API
 18h    DWORD   buffer pointer passed to/from API
 1Ch    WORD    count of bytes passed from API
 1Eh    BYTE    return code (see below)

Values for return code:
 00h - success
 01h - invalid session
 05h - servername invalid
 06h - netware fileserver bindery is locked
 07h communication server not active
 08h general failure in netware fileserver
 09h not logged into a fileserver
 10h connection table full
 11h no response from communication server
 12h connection attempt terminated abnormally
 13h connection refused - no sessions available
 14h gw_no/port already in use
 15h invalid connection response
 16h port invalid
 17h incorrect version in server response
 18h gw_no/port combination not configured
 19h initialization has not been completed
 20h no more sockets are available
 21h no active poolname
 23h FATAL internal interface error
 24h registration of host workstation failed - name is already in used
 25h registration of host workstation failed - workstation name table full
 26h registration of host workstation failed - only one session may be
        registered for dial-in
 FFh telebit acs api is busy - retry later

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