Keypunch - The Original "User Interface:

As the name implies, the keypunch was a device used to punch meaningful patterns of holes into cards using a number of keys. Although UNIVAC made its own line of keypunch equipment, we used a mixture of 026, 029, and (very few) 129 Model Keypunches produced by IBM. These were located in the "back" of the terminal rooms located in Hendricks and Doucette Halls and were used to punch the decks of cards representing user programs. Operating a keypunch is a science unto itself that can be summarized by saying "you can't un-punch a hole!" This encouraged deliberate, slow, and thoughtful entry of program text and produced a generation of programmers that were better-than-average typists!

Even so, humans tend to make errors. One way to save computer time (which was far more valuable than human time when 5,000 people are sharing the same computer!) was to put the card-deck through another machine called the VERIFIER. This was a machine very similar to a keypunch, with sense wires instead of punch knives. For each card, you simply re-typed what was SUPPOSED to have been punched on the card. When the machine detected a difference between what was on the card versus what was currently being typed, an ERROR light would illuminate, prompting the user to inspect that card for errors.

Interactive Terminals:

As mentioned in the section on time-sharing, a number of interactive terminals were used on the UNIVAC 90/60. Most numerous were the teletype 33 and 43 KSR and ASR teleprinters. These had the advantage of producing continuous hard-copy of all the input and output constituting a user's session with the machine. As a disadvantage, it seemed to waste a great deal of paper, particularly during lengthy text-editing sessions. Other hardcopy terminals included a few DECWRITER teleprinters and even some modified IBM Selectric typewriters. CRT terminals were just coming into fashion and these were mostly Lear-Seigler ADM-3A's and a few Sperry-Univac UNISCOPE terminals.