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Served as both input, output and storage system in the eary days!
Video 15. 1964 IBM 029 Keypunch Card Punching Demonstration by CuriousMarc (2014) Source.
Video 16. Using Punch Cards by Bubbles Whiting (2016) Source. Interview at the The Centre for Computing History.
Video 17. Once Upon A Punched Card by IBM (1964) Source. Goes on and on a bit too long. But cool still.