17 Facts About Punched cards


Punched cards card is a piece of stiff paper that holds digital data represented by the presence or absence of holes in predefined positions.

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Punched cards were once common in data processing applications or to directly control automated machinery.

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Punched cards were widely used through much of the 20th century in the data processing industry, where specialized and increasingly complex unit record machines, organized into semiautomatic data processing systems, used punched cards for data input, output, and storage.

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In Nazi Germany, punched cards were used for the censuses of various regions and other purposes .

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Punched cards were still commonly used for entering both data and computer programs until the mid-1980s when the combination of lower cost magnetic disk storage, and affordable interactive terminals on less expensive minicomputers made punched cards obsolete for these roles as well.

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The first card of a group of Punched cards, containing fixed or indicative information for that group, is known as a master card.

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Hollerith's 45 column punched cards are illustrated in Comrie's The application of the Hollerith Tabulating Machine to Brown's Tables of the Moon.

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Continuous form cards could be both pre-numbered and pre-punched for document control .

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Such numbered Punched cards could be sorted by machine so that if a deck was dropped the sorting machine could be used to arrange it back in order.

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Such "lace Punched cards" lacked structural strength, and would frequently buckle and jam inside the machine.

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Long Punched cards were available with a scored stub on either end which, when torn off, left an 80 column card.

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Stub Punched cards were used in applications requiring tags, labels, or carbon copies.

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Aperture cards have a cut-out hole on the right side of the punched card.

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Aperture Punched cards are used for engineering drawings from all engineering disciplines.

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Punched cards were the symbol of information machines, and so they became the symbolic point of attack.

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Punched cards, used for class registration, were first and foremost a symbol of uniformity.

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Common example of the requests often printed on punched cards which were to be individually handled, especially those intended for the public to use and return is "Do Not Fold, Spindle or Mutilate" .

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