punched card - definição. O que é punched card. Significado, conceito
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O que (quem) é punched card - definição

PAPER-BASED RECORDING MEDIUM
Punched cards; Punchcard; Punch cards; Punch Card; Hollerith card; Hollerith cards; IBM card; Hollerith Card; Tabulating card; Computer punch card; Punched-card; Input deck; Punchcards; Punch-card; Punch card; Overpunch; Hollerith encoding; Hollerith code; Port-a-punch; IBM Port-A-Punch; Punched card code; IBM 96-column punched card format; IBM 80-column card; Card deck (computing); Punched-card systems
  • [[Aperture card]]
  • An 80-column punched card with the extended character set introduced with [[EBCDIC]] in 1964.
  • A U.S. Census Bureau clerk (left) prepares punch cards using a pantograph similar to that developed by Herman Hollerith for the 1890 Census, while a second clerk (right) uses a 1930s key punch to perform the same task more quickly.
  • Carpet loom with Jacquard apparatus by Carl Engel, around 1860. Chain feed is on the left.
  • A wall-sized display sample of a punch card for the 1954 U.S. Census of Agriculture
  • Punched card from a [[Fortran]] program: Z(1) = Y + W(1), plus sorting information in the last 8 columns.
  • HP Educational Basic optical mark-reader card.
  • Hollerith card as shown in the ''[[Railroad Gazette]]'' in 1895, with 12 rows and 24 columns.<ref name="Railroad_1895"/>
  • Binary]] punched card.
  • United States National Archives Records Service]] facility in 1959. Each carton could hold 2,000 cards.
  • Invalid "lace cards" such as this pose mechanical problems for card readers.
  • Close-up of a [[Jacquard loom]]'s chain, constructed using 8 × 26 hole punched cards
  • Clerk creating punch cards containing data from the [[1950 United States census]].
  • A 5081 card from a non-IBM manufacturer.
  • A punched card printing plate.
  • A deck of punched cards comprising a computer program. The red diagonal line is a visual aid to keep the deck sorted.<ref name="Miami"/>
  • A blank [[Remington Rand]] [[UNIVAC]] format card. Card courtesy of [[MIT Museum]].
  • A punched Remington Rand card with an IBM card for comparison
  • IBM 96-column punched card
  • Woman operating the card puncher, c.1940
  • A $75 U.S. Savings Bond, Series EE issued as a punched card. Eight of the holes record the bond serial number.
  • Institutions, such as universities, often had their general purpose cards printed with a logo. A wide variety of forms and documents were printed on punched cards, including checks. Such printing did not interfere with the operation of the machinery.
  • A 12-row/80-column [[IBM]] punched card from the mid-twentieth century

punch card         
Punched card         
A 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. Punched cards were once common in data processing applications or to directly control automated machinery.
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. [Jargon File] (1998-10-19)

Wikipédia

Punched card

A 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. Punched cards were once common in data processing applications or to directly control automated machinery.

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. 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.

While punched cards are now obsolete as a storage medium, as of 2012, some voting machines still used punched cards to record votes. Punched cards also had a significant cultural impact.