PSION II Comms Link/USB
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I do have this thing [1] and my experiences on Linux are a bit mixed.
On a GPD Pocket I finally have made a connection but then it was
"disconnected". The GPD has issues with USB power though. And a powered
USB hub probably just added another level of complexity. At least the
device was visible in the "Dmesg" output.
On the Blackbird (Fedora 31/ppc64le) I have had no luck - I has not
able to see it at all. I have no idea if it was influenced by fact that
an another USB-Serial device was already connected.
I really should not use these modern things and use the real serial
link with an already tested USB-serial adapter instead...
References:
[1]
https://www.gossuin.be/index.php/psion-organiser-ii-comms-link-usb