German Reddit user c-wizz reports that he has found a very rare 66-year-old Librascope LGP-30 computer (and several 1970 DEC PDP-8/e computers) in his grandparents’ basement.

Developed by Stan Frankel at the Caltech Institute in 1954, the LGP-30 originally sold for $47,000 (about $512,866 adjusted for inflation today) and weighed about 362kg. Despite this, people despised him.

According to Masswerk.at, the LGP-30 contained 113 vacuum tubes, 1,450 semiconductor diodes, and a rotating magnetic drum capable of storing about 15.8 modern kilobytes.

In a comment to Reddit, c-wizz wrote: “All I know is that my grandfather used it for some engineering calculations in the ’60s and he is one of the few people in the country to have such a computer privately.”.

Having sat in the basement for several decades, the LGP-30 will likely require significant effort to get it back up and running. “It would be great if someone could get this thing working again”– c-wizz writes. “I found a museum in Germany that has (almost) a working LGP-30. I think I will contact them”.