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A punched card (also punch card [1] or punched-card [2]) is a piece of card stock that stores digital data using punched holes. Punched cards were once common in data processing and the control of automated machines .
The term is often used interchangeably with punch card, the difference being that an unused card is a "punch card," but once information had been encoded by punching holes in the card, it was now a "punched card." For simplicity, this article will use the term punched card to refer to either.
A computer punched card reader or just computer card reader is a computer input device used to read computer programs in either source or executable form and data from punched cards. A computer card punch is a computer output device that punches holes in cards. Sometimes computer punch card readers were combined with computer card punches and ...
Punched tape or perforated paper tape is a form of data storage device that consists of a long strip of paper through which small holes are punched. It was developed from and was subsequently used alongside punched cards , the difference being that the tape is continuous.
The punched card system was still in use as of 2013. [72] 2011: The owner of Cardamation, Robert G. Swartz, dies, and the company, perhaps the last supplier of punch card equipment, ceases operation. [73] [74] 2015: Punched cards for time clocks and some other applications were still available; one supplier was the California Tab Card Company. [75]
Chads from punched cards.Each chad is about 3 mm (1 ⁄ 8 in) long. Votomatic [1] voting machines of the type used in the 2000 election in Florida The chip (chad) receiver from a UNIVAC key punch Pouring chads from a jar at the Computer History Museum Asymmetrical chad produced by a railroad ticket punch
Cards with a particular punch could be treated as master cards causing different behavior. For example, customer master cards could be merged with sorted cards recording individual items purchased. When read by the tabulating machine to create invoices, the billing address and customer number would be printed from the master card, and then ...
This category contains articles about punched cards and card handling equipment, including card readers, card punches, and keypunches. Subcategories This category has the following 2 subcategories, out of 2 total.