[COFF] 52-pin D-Sub?

[Rudi Blom]

Not UNIX, not 52-pin, but old, old and serial

Your mission, should you choose to accept it, is to save data from a
computer that should have died aeons ago
...
Tap into the serial line – what could be simpler?
Alas, the TI was smart enough to spot the absence of the rattly old
beast ("the software wouldn't print without some of the seldom-used
serial control lines functioning," explained Aaron) so the customer
was asked to bring in the printer as well.

https://www.theregister.co.uk/2020/02/24/who_me/