Parallel port Loopback (CheckIt) pinout

25 pin D-SUB male connector layout
25 pin D-SUB male connector at the computer


Used to verify that a port is working. This one works with CheckIt

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