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Learn about the history, operation and types of computer punched cards and devices that read or punch them. Punched cards were widely used for data storage and input/output in early computers until the 1970s.
Learn how programmers created, edited and stored programs on punch cards from the invention of computer languages up to the mid-1970s. Find out about the work environment, the keypunch machines, the card readers, the identification and sequence of cards, and the debugging techniques.
Learn about the origin, development and use of punched cards, a piece of card stock that stores digital data using punched holes. Punched cards were widely used in data processing, voting, music and other fields until the 20th century.
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A keypunch is a device for punching holes in paper cards or tape media according to keys struck by a human operator. Learn about the origins, functions and evolution of keypunches from Jacquard looms to computers, and see examples of different models and applications.
An aperture card is a punched card with a microfilm window for archiving or copying documents. Learn about its advantages, disadvantages, usage, machinery and conversion to digital format.
Cards are read and punched one column at a time and binary cards are permitted. Cards are read using photocells, [8] illuminated by fiber optics, unlike the IBM 1402, which uses wire brushes to read cards. It is even possible to create (but not read, except in Binary Mode [9]) "IBM Doilies," cards with every possible hole punched. Few other ...
A punched card sorter is a machine for sorting decks of punched cards. Sorting was a major activity in most facilities that processed data on punched cards using unit record equipment. The work flow of many processes required decks of cards to be put into some specific order as determined by the data punched in the cards.