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An IBM 80-column punched card of the type most widely used in the 20th century IBM 1442 card reader/punch for 80 column cards. 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 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 .
A single program deck, with individual subroutines marked. The markings show the effects of editing, as cards are replaced or reordered. Many early programming languages, including FORTRAN, COBOL and the various IBM assembler languages, used only the first 72 columns of a card – a tradition that traces back to the IBM 711 card reader used on the IBM 704/709/7090/7094 series (especially the ...
Other gamblers could make a dirty deal with the customers: give the customer a "map" of where the big prizes are on the punchboard. This came to prevention by the use of serial numbers: the customer would present the slip to the operator, and if the serial numbers matched, the customer was declared a winner.
The top three rows of the card are called zone punches, [3] and so numeric character data which may contain overpunches is called zoned decimal. In IBM terminology, the low-order four bits of a byte in storage are called the digit , and the high-order four bits are the zone . [ 4 ]
Various special vehicles took numbers in the 626x, 63xx and 69xx series. The 7xxx series was used for Composite Corridor cars renumbered from 15xxx and 16xxx. 9000-12999 Brake open cars 9200-9599 third class. Cars fitted with buffet facilities took numbers in the 90xx and 91xx series. Cars fitted with a driving cab took numbers in the 97xx series.
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.
IBM 080 Card Sorter IBM 082 Card Sorter. 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 ...