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-
- TITLE : LapLink cable specifications.
- DATE : 18-08-1994
- AUTHOR : C. Holz.
- EMAIL : cholz@wilbur.mbark.swin.oz.au
-
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-
- Serial link cable.
- ------------------
- Make a serial cable with two female DB25 (or female RS232) connectors.
- Seven connections are required. Wire the cable as follows:
-
- 9 pin 25 pin 25 pin 9 pin
- ===== ====== ====== =====
- pin 2 pin 3 <---> pin 2 pin 3 (Receive-Transmit)
- pin 3 pin 2 <---> pin 3 pin 2 (Transmit-Receive)
- pin 4 pin 20 <---> pin 6 pin 6 (DTR---DSR)
- pin 5 pin 7 <---> pin 7 pin 5 (Grd---Grd)
- pin 6 pin 6 <---> pin 20 pin 4 (DSR---DTR)
- pin 7 pin 4 <---> pin 5 pin 8 (RTS---CTS)
- pin 8 pin 5 <---> pin 4 pin 7 (CTS---RTS)
-
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-
- Parallel link cable.
- --------------------
- Make a parallel wiring box with male DB-25 connectors at both ends.
- Fifteen connections are required.
-
- 25 pin 25 pin
- ====== ======
- pin 01 <----> pin 01
- pin 02 < > pin 15
- pin 03 < > pin 13
- pin 04 < > pin 12
- pin 05 < > pin 10
- pin 06 < > pin 11
- pin 10 < > pin 05
- pin 11 < > pin 06
- pin 12 < > pin 04
- pin 13 < > pin 03
- pin 14 <----> pin 14
- pin 15 < > pin 02
- pin 16 <----> pin 16
- pin 17 <----> pin 17
- pin 25 <----> pin 25 (Grd---Grd)
-
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-
- Null modem plugs.
- -----------------
- The best way I have seen to make you own laplink cables is to purchase two DB25
- wiring boxes. One Male to Male, the other Female to Female.
- The Male to Male is wired up as a Parallel null modem, and the Female to Female
- as the Serial null modem.
- All that is needed then is a standard serial EXTENSION cable (Male to Female
- DB25).
- By plugging the Serial Null modem into the Male end, you have a full serial
- laplink cable with Female to Female connectors.
- Or visa-versa by plugging the Parallel Null modem into the Female end, you have
- a full parallel laplink cable with Male to Male connectors.
- The only single problem with this is, that the serial null modem will not plug
- into a standard RS232 9 pin plug. This can be overcome by purchasing one or
- two convertors (9 pin Female to 25 pin male).
-
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-
- Laplink extension cable.
- ------------------------
- Instead of forking out large amounts of money for an extension cable for your
- current cable or for the null modem, and extension cable can be made from the
- following specs.
- Make a cable with one female and one male DB-25 connector at either end.
- Fifteen wires are required. Four jumper wires are required between pins.
-
- 25 pin 25 pin
- ====== ======
- pin 01 pin 01
- pin 02 pin 02
- pin 03 pin 03
- pin 04 pin 04
- pin 05 pin 05
- pin 06 pin 06
- pin 07 / 25 pin 07 / 25
- pin 10 pin 10
- pin 11 / 20 pin 11 / 20
- pin 12 pin 12
- pin 13 pin 13
- pin 14 pin 14
- pin 15 pin 15
- pin 16 pin 16
- pin 17 pin 17
-
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-
- Information.
- ------------
- These specifications are complete to my knowledge. The specs allow in laplink
- what is known as Accelerated Transfer, which is much faster than Standard
- transfer.
-
- These cable have been fully tested for DOOM. To play DOOM over parallel link,
- it is necessary to acquire a file called DOOMPAR.ZIP produced by an author
- called Andrew who produced a serial driver for use with DOOM r1.1.
- One warning with using the parallel connection with DOOM, that some computers
- do not work and a connection is never found.
-
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