I have similar memories. Doing my best to “make sure” there were no mistakes in my program (Basic), punching the cards, handing the stack to the instructor, and waiting over the weekend for the instructor to take every student’s stack of cards to an office building up town where he would run the cards through a time-sharing computer that cost millions of dollars and took up an entire floor of the building. By Monday, I’d know that my program didn’t run (but not why).

All of that guaranteed that I would have no interest in computers until audio went digital.

Oh, the early ’70s!