- CeckIt 25 pin Serial Port Loopback
- CeckIt 9 pin Serial Port Loopback
- CeckIt Parallel Port Loopback
- Norton 25 pin Serial Port Loopback
- Norton 9 pin Serial Port Loopback
- Norton Parallel Port Loopback
- Norton/PassMark Parallel Port Loopback
- Passmark 25 pin Serial Port Loopback
- PassMark 9 pin Serial Port Loopback
- Serial (Female D9F) Loopback for PC-check
Loopback
Loopback cables pin-out
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