Pinouts of Loopbacks

• Parallel Port Loopback (CheckIt) Used to verify that a port is working. This one works with CheckIt
• Parallel Port Loopback (Norton) Used to verify that a port is working. This one works with Norton Utilities: Norton Diagnostics from Symantec
• Parallel Port Loopback for Norton/PassMark Used to verify that a port is working. This one works with Norton Utilities: Norton Diagnostics and PassMark Software.
• Serial Port Loopback (25 CheckIt) Used to verify that a port is working. This one works with CheckIt.
• Serial Port Loopback (25 Norton) Used to verify that a port is working. This one works with Norton Utilities: Norton Diagnostics from Symantec.
• Serial Port Loopback (9 CheckIt) Used to verify that a port is working. This one works with CheckIt.
• Serial Port Loopback (9 Norton) Used to verify that a port is working. This one works with Norton Utilities: Norton Diagnostics from Symantec.
• Serial Port Loopback for PassMark (9 pin) Used to verify that a port is working. This one works with PassMark Software.
• Serial Port Loopback for Passmark (25 pin ) Used to verify that a port is working. This one works with Passmark