InterLink Cables

█▌Overview▐█ 
  The DOS 6.0+ InterLink utility provides a means to share files and data
  between two computers without using a network.  It is typically used to
  attach a laptop computer to a desktop model.  This topic describes the
  cables used to connect the two computers.

█▌Serial Cables▐█
  When connecting via COMn serial ports, you can use a standard 25-pin or
  9-pin (or 25-to-9 pin) serial cable .  The cable will need to have female
  connectors on both ends.  If you have such a cable laying around, try
  it--it will probably work.

  Here are the pin connections, in case you need to create a cable or, if
  you need to buy one, you can specify your needs exactly:

  For normal data-transmission connections, just three wires are used:

      9-pin (25-pin)                            9-pin (25-pin)
        connector                                 connector
      ─────────────                             ──────────────
       pin 5 (7)   ◄═══ (ground-to-ground) ════►  pin 5 (7)
       pin 3 (2)   ◄══ (transmit-to-receive) ══►  pin 2 (3)
       pin 2 (3)   ◄══ (receive-to-transmit) ══►  pin 3 (2)

  A 7-wire null-modem cable is needed for remote copy operations
  (i.e., Intersvr /RCOPY):

      9-pin (25-pin)                            9-pin (25-pin)
        connector                                 connector
      ─────────────                             ──────────────
       pin 5 (7)   ◄═══ (ground-to-ground) ════►  pin 5 (7)
       pin 3 (2)   ◄══ (transmit-to-receive) ══►  pin 2 (3)

       pin 7 (4)   ◄══════ (RTS-to-CTS) ═══════►  pin 8 (5)
       pin 6 (6)   ◄══════ (DSR-to-DTR) ═══════►  pin 4 (20)

       pin 2 (3)   ◄══ (receive-to-transmit) ══►  pin 3 (2)
       pin 8 (5)   ◄══════ (CTS-to-RTS) ═══════►  pin 7 (4)
       pin 4 (20)  ◄══════ (DTR-to-DSR) ═══════►  pin 6 (6)

   Notes: ■ This cable also works for normal InterLink transmissions.
          ■ You can use a standard cable if you attach a "null modem
            adapter" to one end of it.

█▌Parallel Cables▐█
  When connecting via LPTn parallel ports, you need male DB-25 connectors on
  both ends of the cable (many parallel cables have a Centronics connector
  on one end--these won't work).  Eleven wires are connected:

         25-pin         25-pin
       connector      connector
       ─────────      ─────────
        pin 2   ◄════► pin 15
        pin 3   ◄════► pin 13
        pin 4   ◄════► pin 12
        pin 5   ◄════► pin 10
        pin 6   ◄════► pin 11
        pin 15  ◄════► pin 2
        pin 13  ◄════► pin 3
        pin 12  ◄════► pin 4
        pin 10  ◄════► pin 5
        pin 11  ◄════► pin 6
        pin 25  ◄════► pin 25 (Ground-Ground)

See Also: Cables and Pin Outs
          Parallel Ports
          Serial Ports
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