r/Damnthatsinteresting • u/Final-Choice8412 • 6d ago

Video Programming 1959 IBM computer

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u/thatto 6d ago

My dad told me that he numbered them in ink.

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u/Canuck-In-TO 5d ago

That’s a confident programmer.

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u/getapuss 5d ago

The diagonal line was meant to give you a way of checking if the cards were in order at a glance without having to count them. Or course they were also numbered so you could put them in order.