Punched Cards - CHM Revolution

From Math to DataPeople used calculators to manipulate numbers. But how do you make machines that also manipulate words or ideas? Punched cards, a mainstay of early office automation and computing, helped launch the transition from doing math to processing data. Patterns of holes punched in cards can represent any kind of information. Punched cards can preserve data too: just file them away!

Punched card hi-res stock photography and images - Alamy

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Punch cards-VBForums

CHM Revolution Tour - Punch Cards: Hollerith

Doug Jones's punched card history

Douglas W. Jones's collection of punched card ballotss

Douglas W. Jones's punched card index

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An Empire Built on Punched Cards - CHM Revolution