punched card

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Related to Punch cards: Hollerith card, Charles Babbage

punched card

(esp US), punch card
(formerly) a card on which data can be coded in the form of punched holes. In computing, there were usually 80 columns and 12 rows, each column containing a pattern of holes representing one character

punched card

[′pəncht ‚kärd]
(computer science)

punched card

(storage, history)
(Or "punch card") The signature medium of computing's Stone Age, now long obsolete outside of a few legacy systems. The punched card actually predates computers considerably, originating in 1801 as a control device for Jacquard looms. Charles Babbage used them as a data and program storage medium for his Analytical Engine:

"To those who are acquainted with the principles of the Jacquard loom, and who are also familiar with analytical formul?, a general idea of the means by which the Engine executes its operations may be obtained without much difficulty. In the Exhibition of 1862 there were many splendid examples of such looms. [...] These patterns are then sent to a peculiar artist, who, by means of a certain machine, punches holes in a set of pasteboard cards in such a manner that when those cards are placed in a Jacquard loom, it will then weave upon its produce the exact pattern designed by the artist. [...] The analogy of the Analytical Engine with this well-known process is nearly perfect. There are therefore two sets of cards, the first to direct the nature of the operations to be performed -- these are called operation cards: the other to direct the particular variables on which those cards are required to operate -- these latter are called variable cards. Now the symbol of each variable or constant, is placed at the top of a column capable of containing any required number of digits."

-- from Chapter 8 of Charles Babbage's "Passages from the Life of a Philosopher", 1864.

The version patented by Herman Hollerith and used with mechanical tabulating machines in the 1890 US Census was a piece of cardboard about 90 mm by 215 mm. There is a widespread myth that it was designed to fit in the currency trays used for that era's larger dollar bills, but recent investigations have falsified this.

IBM (which originated as a tabulating-machine manufacturer) married the punched card to computers, encoding binary information as patterns of small rectangular holes; one character per column, 80 columns per card. Other coding schemes, sizes of card, and hole shapes were tried at various times.

The 80-column width of most character terminals is a legacy of the IBM punched card; so is the size of the quick-reference cards distributed with many varieties of computers even today.

See chad, chad box, eighty-column mind, green card, dusty deck, lace card, card walloper.
References in periodicals archive ?
An article ("Punched Card System of Inventory Control") in the August 15, 1923, issue explains punch cards. The author describes what the card is and does.
Taking a cue from acute care, some LTPAC organizations are now finding a solution in a new use of a mature technology: automated dispensing units (ADUs), which eliminate stock waste and time spent on handling punch cards and drug distribution and tracking, especially when combined with electronic medical record technology.
Memberships and punch cards can be purchased at the Brant Sports Complex or the Community Services office at 15 Curtis Ave., Paris.
There was widespread adoption of punch card and tabulating machine technology for accounting-related processing, a trend that continued into the 1960s and '70s, when punch cards were the backbone of computing--until the introduction of more reliable and cost-effective technologies.
12 mins LESSON 3 punch cards, card readers, keypunch (cardpunch), on-line, off-line, reading brushes, reading lights.
He began working with wool after a print project involving knit punch cards set him thinking.
The Netherlands in 1939 had one of the most accurate census methods in the world with all sorts of information about its citizens stored on Hollerith punch cards. The chief statistician had boasted that he could create a paper record that could characterise every citizen in detail.
In 1964, young protesters at Berkeley used computer punch cards as a symbol of everything dehumanizing in postwar American culture.
(29) But even the most recent machines are believed to be imperfect: "Concerns about punch cards and lever voting machines have given way to concerns about their replacements." (30)
* By counting punch cards at a centralized counting center that is not open to the public--an obvious invitation for something one on the inside to swap boxes of incoming ballot for pre-punched ballots with desired outcomes.
The 1940s brought punch cards (sometimes called the IBM card), a digital system for storing information based on the absence or presence of holes in a card.
So, too, were the computer touch-screen machines brought in to replace punch cards in Florida's aftermath that are now viewed with suspicion by many leading computer scientists and the General Accounting Office.