Punched cards also had a significant cultural impact.Ĭlose-up of a Jacquard loom's chain, constructed using 8 × 26 hole punched cards History While punched cards are now obsolete as a storage medium, as of 2012, some voting machines still used punched cards to record votes. Many early digital computers used punched cards as the primary medium for input of both computer programs and data. The IBM 12-row/80-column punched card format came to dominate the industry. 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. Punched cards were once common in data processing applications or to directly control automated machinery. For the COBOL code, see Signed overpunch.Ī 12-row/80-column IBM punched card from the mid-twentieth centuryĪ punched card (also punch card or punched-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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