I grew up in a little post soviet republic, in a small town with a big nuclear power plant.

Coincidently, that's where my father was working as a programmer until the shutdown of the plant.

Anyways, he was maintaining a bunch of systems related to collecting data from environment monitoring sensors around the plant. In mid 2000s or so he showed me some data collecting machines using what looked like DOS text UI that mentioned being written in Leningrad, 1989 or 1988.

The software was running in an emulator on Linux, which my father used to replace original x86-compatible machines runninh dos.

Pretty sure thr whole thing was running for quite a while since my family moved elsewhere.