Parallel interfaces and ports cables scheme
Used to verify the port is functional.

CheckIt Loopback 

Name Pin Pin Name
Busy 11 17 Select Input
Acknowledge 10 16 Initialize
Paper end 12 14 Auto Feed
Select 13 1 Strobe
Data Bit 0 2 15 Error

Norton/Passmark LoopBack

Name Pin Pin Name
Data Bit 0 2 15 Error
Data Bit 1 3 13 Select
Data Bit 2 4 12 Paper Out
Data Bit 3 5 10 Acknowledge
Data Bit 4 6 11 Busy

Loopback, or loop-back, refers to the routing of electronic signals, digital data streams, or flows of items back to their source without intentional processing or modification. This is primarily a means of testing the transmission or transportation infrastructure. A communications transceiver can use loopback for testing its functionality. For example, a device transmit pin connected to its receive pin will result in the device receiving exactly what it transmits. Moving this looping connection to the remote end of a cable adds the cable to this test.

25 pin D-SUB male connector layout
25 pin D-SUB male connector
at the computer
According to 6 reports in our database (6 positive and 0 negative) this pinout should be correct.

Is this pinout
Parallel port (LPT) Loopback visual pinout:
Parallel port (LPT) Loopback  diagram
click to enlarge
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