LapLink cable

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A Laplink Cable, also known as null-printer cable, allows the connection of two computers via the parallel port to establish a direct cable connection.

The cable was introduced in 1983 with the Laplink software package, from Traveling Software, to allow fast data transfer between the early PCs running MS-DOS, giving much faster transfer rates than the traditional null modem serial cable. At the time, almost all PCs had a parallel printer port, but neither USB nor modern Ethernet was available.

The INTERSVR program in MS-DOS 6.0 can also use a LapLink cable.

Traveling Software[edit]

Traveling Software is now known as Laplink Software, Inc.[1] and their main software is now PCmover. With the demise of parallel ports on PCs Laplink no longer sells the traditional cable. Instead it has USB to hard drive, USB to USB and Ethernet to Ethernet cables.[2] A Laplink cable can be seen as a parallel equivalent to a serial null modem cable. Because of the higher bandwidth of the parallel port versus the serial port, a Laplink cable is able to transfer data more quickly.


The cable used two DB25 male connectors, and was wired as below:

D0 2 15 Error
D1 3 13 Select
D2 4 12 Paper Out
D3 5 10 ACK
D4 6 11 Busy
ACK 10 5 D3
Busy 11 6 D4
Paper Out 12 4 D2
Select 13 3 D1
Error 15 2 D0
Select In 17 19 GND
GND 18 18 GND
GND 19 17 Select In
GND 21 21 GND
GND 22 22 GND
GND 23 23 GND
GND 25 25 GND

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