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See all on WikipediaPunched card - Wikipedia
A punched card (also punch card or punched-card ) 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. Punched cards were widely used in the 20th century, where unit record machines, organized into … See more
The idea of control and data storage via punched holes was developed independently on several occasions in the modern period. In most cases there is no evidence that each … See more
The Hollerith punched cards used for the 1890 U.S. census were blank. Following that, cards commonly had printing such that the row and column position of a hole could be easily seen. … See more
While punched cards have not been widely used for generations, the impact was so great for most of the 20th century that they still appear … See more
Processing of punched cards was handled by a variety of machines, including:
• Keypunches—machines with a keyboard that punched cards from operator entered data.
• Unit record equipment—machines that process data on … See moreThe terms punched card, punch card, and punchcard were all commonly used, as were IBM card and Hollerith card (after Herman Hollerith). … See more
IBM's Fred M. Carroll developed a series of rotary presses that were used to produce punched cards, including a 1921 model that operated at 460 cards per minute (cpm). In … See more
Wikipedia text under CC-BY-SA license The punched card - IBM
Learn how IBM's punched card, a thin piece of cardboard with holes, became a symbol of 20th-century automation and a core product of the company. Explore the evolution, uses and legacy of the card that preceded floppy disks, …
What is a Punch Card? Definition and Uses - GeeksforGeeks
Jun 20, 2024 · Learn what punch cards are, how they work, and why they were used in early computing. Find out how to read, process, and store data with punch cards and their coding …
Punched Card Machines — Google Arts & Culture
Punched cards are considered the first of three machine attacks developed at Bletchley Park, the second was the Bombe (an automated data sorting device to crack the settings of the Enigma...
Herman Hollerith, the Inventor of Computer Punch …
Mar 27, 2019 · Learn how Herman Hollerith invented the punch card machine to process census data faster and how it became the basis of modern data processing. Find out the history, uses and evolution of punch cards and their …
What is a Punch Card? - Computer Hope
Mar 10, 2024 · Learn what a punch card is, how it works, and why it was used in early computers. Find out the history of the punch card, the terms related to it, and the devices that read and punched it.
Early Punched Card Equipment, 1880 - 1951 - ETHW
Punched card tabulating equipment, invented and developed by Herman Hollerith to process data from the United States Census of 1890, was the first mechanized means for compiling and analyzing statistical information.
Punch Cards for Data Processing | Smithsonian Institution
Learn how punch cards were used for data processing in the U.S. Census, commercial enterprises, and early computers. See examples of different types and uses of punch cards from the Smithsonian collections.
Early Card Punch Machines - Columbia University
Sep 25, 2007 · Learn about the history and evolution of card punch machines, from the 1890 US census to the 1930s. See photos and diagrams of different models, features, and applications of punched cards.
Card Punch Machines – LegacyTechList
Card punch machines are mechanical or electromechanical devices used to punch holes in cards to encode information. Each hole (or absence of a hole) in the card represented a …
