Laplink Parallel Cables

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Parallel LapLink Cable

The cable described below can be used to connect two PCs, to let them communicate via the application program LapLink™.

It's recommended that you set up your parallel ports to either EPP or EPP/ECP mode for use with this cable.

To build this cable, you'll need a shielded cable with at least 15 conductors, and two DB-25 male connectors.

Description Male DB-25 ==>> Male DB-25 Description
STROBE 1 to 1 STROBE
Data Bit 0 2 to 15 /FAULT
Data Bit 1 3 to 13 SEL
Data Bit 2 4 to 12 POUT
Data Bit 3 5 to 10 /ACK
Data Bit 4 6 to 11 BUSY
Data Bit 5 7 Both not used Data Bit 5
Data Bit 6 8 Both not used Data Bit 6
Data Bit 7 9 Both not used Data Bit 7
/ACK 10 to 5 Data Bit 3
BUSY 11 to 6 Data Bit 4
POUT 12 to 4 Data Bit 2
SEL 13 to 3 Data Bit 1
 /AUTOFEED  14 to

14

  /AUTOFEED 
/FAULT 15 to

2

 Data Bit 0
/RESET  16 to

16

 /RESET
/SLCT IN 17 to 17 /SLCT IN
GND 18 Both not used GND
GND 19 Both not used GND
GND 20 Both not used GND
GND 21 Both not used GND
GND 22 Both not used GND
GND 23 Both not used GND
GND 24 Both not used GND
GND 25 to

25

 GND

It is suggested that you attach the drain wire of the shield of your cable to the shield of the DB-25 connector.

Note - There are a number of cable diagrams for LapLink parallel cables on the web, many of which are contradictory.   The above chart matches the pin out of a LapLink parallel cable measured by me.  The cable was from a 1996 version of LapLink for Windows.

One reader (Joakim R. Perrine) did just that, and has reported that the above set of pin outs don't work for Windows 95's Direct Cable Connection program (DCC), but that a cable built as described in the following table does.

To build this cable, you'll need a shielded cable with at least 17 conductors, and two DB-25 male connectors.

Description Male DB-25 ==>> Male DB-25 Description
STROBE 1 Both not used STROBE
Data Bit 0 2 to 15 /FAULT
Data Bit 1 3 to 13 SEL
Data Bit 2 4 to 12 POUT
Data Bit 3 5 to 10 /ACK
Data Bit 4 6 to 11 BUSY
Data Bit 5 7 Both not used Data Bit 5
Data Bit 6 8 Both not used Data Bit 6
Data Bit 7 9 Both not used Data Bit 7
/ACK 10 to 5 Data Bit 3
BUSY 11 to 6 Data Bit 4
POUT 12 to 4 Data Bit 2
SEL 13 to 3 Data Bit 1
 /AUTOFEED  14 Both not used  /AUTOFEED 
/FAULT 15 to

2

 Data Bit 0
/RESET  16 Both not used /RESET
/SLCT IN 17 to 19 /SLCT IN
GND 18 to 18 GND
GND 19 to 17 /SLCT IN
GND 20 Both not used GND
GND 21 to 21 GND
GND 22 to 22 GND
GND 23 to  23 GND
GND 24 Both not used GND
GND 25 to

25

 GND

It is suggested that you attach the drain wire of the shield of your cable to the shield of the DB-25 connector.

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Last modified: 07/08/10.

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