>Yes, the reduction in jams was huge. The square corner seemed to want to grab anything it could.

I had some contact with that - while studying. We had a Varian 72, which actually did have one monitor and keyboard, but it accessed, I think, only some rudimentary command processor. The commands issued on it were mostly "run the next batch of cards" or "dump the deck", or something about printer settings.

We all had graphite pencils then. First, you could use the eraser to fix a typo (well, stylo?) on those green-ruled code sheets, and more important, if you had a ballpoint, the lab assistant would simply lift it out of your pocket. He needed those little springs to keep fixing the card punchers.