"Overpunch" redirects here. For the COBOL code, see Signed overpunch.
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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.
Punched cards were widely used in the 20th century, where unit record machines, organized into data processing systems, used punched cards for data input, output, and storage.[3][4] The IBM 12-row/80-column punched card format came to dominate the industry. Many early digital computers used punched cards as the primary medium for input of both computer programs and data.
Data can be entered onto a punched card using a keypunch.
While punched cards are now obsolete as a storage medium, as of 2012, some voting machines still used punched cards to record votes.[5] Punched cards also had a significant cultural impact in the 20th century.
Close-up of a Jacquard loom's chain, constructed using 8 × 26 hole punched cards
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A punchedcard (also punchcard or punched-card) is a piece of card stock that stores digital data using punched holes. Punched cards were once common...
punchedcard sorter is a machine for sorting decks of punched cards. Sorting was a major activity in most facilities that processed data on punched cards...
programmers created, edited and stored their programs line by line on punch cards. A punchedcard is a flexible write-once medium that encodes data, most commonly...
can acquire data from a card via a number of methods, including: optical scanning of printed text or barcodes or holes on punched cards, electrical signals...
event of a dispute. In a jurisdiction using a punchedcard system, voters choose by removing or "punching out" a perforated chad from the ballot next each...
A lace card is a punchedcard with all holes punched (also called a whoopee card, ventilator card, flyswatter card, or IBM doily). They were mainly used...
read data from punched paper tape and punched that data into cards. The IBM 063 Card-Controlled Tape Punch read punched cards, punching that data into...
the fall of 2009. Punchedcard systems employ a card (or cards) and a small clipboard-sized device for recording votes. Voters punch holes in the cards...
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...
punched cards contained data to be processed by those machines. For computers equipped with a punchedcard input/output device the resulting punched cards...
for multi-hole punched paper is with a ring binder. A book-like cover is fitted with retaining rings matching the pattern of the punched holes. The rings...
devised a tabulating system that included cards (Hollerith card, later Punchedcard), a punch for holes in them representing data, a tabulator and a sorter...
was popular in marginal punched-card systems. Many names, some of them trademarked, have been used for marginal punched-card systems: edge-notched cards...
Herman Hollerith invented data storage on punched cards that could then be read by a machine. To process these punched cards, he invented the tabulator and...
tabulating machine for punched cards to assist in summarizing information and, later, in accounting. His invention of the punchedcard tabulating machine...
A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees...
technology of punched cards, Herman Hollerith. In April 1949 the company name was changed to IBM Deutschland. The technology of punched cards dates back...
Retrieved 2020-07-02. General Information Manual: An Introduction to IBM PunchedCard Data Processing. IBM. p. 1. Janda, Kenneth (1965). Data Processing. Northwestern...
pencil in designated locations on a punchedcard and then punch holes corresponding to those marks into the card number cards consecutively (an optional...
systems card reader/punch IBM 1412: Punchedcard reader/punch IBM 1442: IBM 1440 and IBM System/360 Card reader/punch IBM 1444: IBM 1240/1440 Punchedcard reader/punch...
An aperture card is a type of punchedcard with a cut-out window into which a chip of microfilm is mounted. Such a card is used for archiving or for making...
Both the United States and Nazi Germany used IBM punchedcard technology for some parts of their operations and record keeping. In Germany, during World...
Multiplying Punch was a unit record machine that could read two numbers from a punchedcard and punch their product in a blank field on the same card. The factors...
the punchedcard reader. Text (which could be data or source code) was punched off-line using a keypunch machine. Most early computers used punched cards...
number of punched cards laced together into a continuous sequence. Multiple rows of holes were punched on each card, with one complete card corresponding...
The Remington Rand 409, a punchedcard calculator which was programmed with a plugboard, was designed in 1949.[citation needed] It was sold in two models:...
a punchedcard from a deck, do some calculations based on the wiring of its plugboard, and punch results onto the same card. A separate IBM 521 Card Read/Punch...
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