Back in 1993, I worked on Santa Cruz Operations Unix and Xenix. I used to install them on servers and connect them up to Computone multi-port serial boards with Wyse 50/60 dumb terminals, so that doctor offices would use centralized medical charts/records and electronic (over 9600 dial-in modem) billing for Medicare, Medicaid, and Blue Cross/Blue Sheild.
Hadn’t heard of Linux for another 5 years after that, IIRC.
I actually still have one of those Wyse terminals around here. Why? I don’t know...