Reply 60 of 144, by weedeewee
Absolutely, the test requires a loopback dongle which connects a few more pins to some other pins, including 2 to 3, RxD & TxD connected.
Without loopback dongle, the test is mostly meaningless.
I guess the pinout for a checkit serial loopback dongle can still be found on the internet somewhere.
edit: added themobrules reference for dongle pinout Re: serial mouse not detected on a 386 motherboard
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https://www.vogonswiki.com/index.php/Serial_port