@flexion In 1997 or so, somebody got my department a Challenge system *on indefinite loan*. I want to say it was one of the then-new R10000 systems, but wouldn’t swear to it. Unfortunately nobody knew what to *do* with it, so it sat almost entirely idle the whole time we had it. I felt bad for it so for a year or so my login routine opened a window and ran ‘dc’ on it, just in case I needed a calculator quickly.

Huh. I just realized that’s probably where I fell in love with RPN calculators.