Funny how that works! My first job in 2001 still had a Compaq Deskpro 386 bought in the 80s to control some very expensive equipment (via some proprietary dongle that wouldn't work on then-modern computers).

My boss at the time told me they paid $10k for that computer when it was new & the equipment it controlled would cost $1-2m to replace (I want to say it was a microspectrophotometer but my memory is blurry), so they had to keep that 386 around & in working order. Luckily these were apparently very reliable computers.