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Punch cards ftw
(i.imgflip.com)
Fun fact I found in a game...
Chip Defense (A tower defense game with a microprocessor theme)
without proof, we're up voting you because we want it to be true
In the 90s my dad showed me his stack of IBM compatible 12 bit per column, 80 column card from his time working at the university physics department's computer in the 70s. He had no access anymore to card readers and just kept the cards for sentimental value.
Most cards contain FORTRAN programs for the TR440 computer made by Telefunken.
Sorry, I have no further proof. :)
thanks for following up!