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These cards (e.g., a JCL "JOB" card to start a new job) were often pre-punched in large quantities in advance. [1] This was especially useful when the main computer did not read the cards directly, but instead read their images from magnetic tape that was prepared offline by smaller computers such as the IBM 1401. After reading the cards in ...
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 ...
At the time, Dover's computer was based on vacuum tube technology (2,400 vacuum tubes), used punch cards as input and output, and filled an extremely large room. [3] In Ellis' free time on the job, he read and re-read the dozens of computer manuals that came with the machine. He taught himself as much as possible about the machine without ...
A 12-row/80-column IBM punched card from the mid-twentieth century. 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.
Others in the series included the IBM 513 & IBM 514 Reproducing Punch. The 519, which was "state of the art for the time", [1] could: reproduce all or parts of the information on a set of cards "gangpunch" - copy information from a master card into the following detail cards; print up to eight digits on the end of a card; compare two decks of cards
The 711's read mechanism was based on the IBM 402's and could read 150 cards per minute (250 cards per minute on the IBM 7090). It included a control panel that could be wired to transfer any 72 columns out of the 80 on a card into the computer's memory, though in practice the panel was almost always wired to read the first 72 columns.
Imagine how steamed you might be if you took that parking home and tried to pay for it online, only to learn later that it was a fake web site, and that your computer has been The pay-a-parking ...
The IBM 1402 was a high-speed card reader/punch introduced on October 5, 1959 as a peripheral input/output device for the IBM 1401 computer. It was later used with other computers of the IBM 1400 series and IBM 7000 series product lines.