There were two key innovations that made this possible. The first was IBM’s invention of the magnetic stripe card in the 1960s: this was a thin strip of magnetized tape, bonded to a plastic card, that could encode and store data like account numbers, and which could be read by a machine when swiped through a card reader. And the second was Digital Equipment Corporation’s pioneering minicomputer, which dramatically reduced the price and size of general-purpose computing.
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