| 21. | Punched cards were still commonly used for data entry and programming until the mid-1980s.
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| 22. | Another area includes a range of electro-mechanical punched card machines.
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| 23. | IBM introduced the 80-column rectangular hole punched card in 1928.
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| 24. | A radix sorting algorithm was originally used to sort punched cards in several passes.
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| 25. | :Subsequently there was important contributions from Herman Hollerith who invented punched card tabulation machines.
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| 26. | Punched card data was transferred to and from the core memory as binary images.
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| 27. | Users could write programs in DGL and input them into DAC using punched cards.
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| 28. | That allowed punched card data to be recorded by people using only a pencil.
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| 29. | Also, the data input to early computers used punched cards.
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| 30. | The concept of keying your punched cards through the console was a marketing ploy.
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