Enormous dimensions, complicated military calculations, and thousands of vacuum tubes—this was the early supercomputer.

There’s a Blue Bendix in Texas, and thanks to [Usagi Electric] it’s the oldest operating computer in North America. The Bendix G-15, a vacuum tube computer originally released in 1956 ...

(Credit: David Lovett, YouTube) After recently putting together the paper tape reader for his custom tube-based UE1 computer, [David Lovett] did get squiggles on the outputs, but not quite the ...