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I wonder how you managed revisions to punch cards…
Just tape it over.
How do you view old versions?
Remove the tape.
That’s a lot of tape to manage ヽ(ﾟ∀ﾟヽ)
They actually used red tape for that, and this is why burocracy is called red tape, because they had to fill paperwork everytime a code change was needed or reversed.
Coloured punch cards? I have no idea either.
Easy, pens, eraser, tape and writing comments on the card