Parallel Port LoopBack plug

Used to test the operation of Parallel ports on a PC.
Used with almost all Checking Software.
The Parallel Port external loopback testing requires a D25 parallel port loopback plug wired as shown here.

Signals                 Pins
Stobe/Select In	        1, 13
Data0/Error In	        2, 15
Auto FD/Paper End In	12, 14
Init/Acknowledge In/CD	10, 16
Select Out/Busy In	11, 17
All other Pins          Open