punched card
punched card
orpunch card
| Noun | 1. |  punched card - a card on which data can be recorded in the form of punched holes |
| 单词 | punched card | |||
| 释义 | punched cardpunched cardorpunch card
punched cardpunched card(esp US), punch cardpunched card[′pəncht ‚kärd]punched card(storage, history)"To those who are acquainted with the principles of theJacquard loom, and who are also familiar with analyticalformul?, a general idea of the means by which the Engineexecutes its operations may be obtained without muchdifficulty. In the Exhibition of 1862 there were manysplendid examples of such looms. [...] These patterns are thensent to a peculiar artist, who, by means of a certain machine,punches holes in a set of pasteboard cards in such a mannerthat when those cards are placed in a Jacquard loom, it willthen weave upon its produce the exact pattern designed by theartist. [...] The analogy of the Analytical Engine with thiswell-known process is nearly perfect. There are therefore twosets of cards, the first to direct the nature of theoperations to be performed -- these are called operationcards: the other to direct the particular variables on whichthose cards are required to operate -- these latter are calledvariable cards. Now the symbol of each variable or constant,is placed at the top of a column capable of containing anyrequired number of digits." -- from Chapter 8 of Charles Babbage's "Passages from the Lifeof a Philosopher", 1864. The version patented by Herman Hollerith and used withmechanical tabulating machines in the 1890 US Census was apiece of cardboard about 90 mm by 215 mm. There is awidespread myth that it was designed to fit in the currencytrays used for that era's larger dollar bills, but recentinvestigations have falsified this. IBM (which originated as a tabulating-machine manufacturer)married the punched card to computers, encoding binaryinformation as patterns of small rectangular holes; onecharacter per column, 80 columns per card. Other codingschemes, sizes of card, and hole shapes were tried at varioustimes. The 80-column width of most character terminals is a legacy ofthe IBM punched card; so is the size of the quick-referencecards distributed with many varieties of computers even today. See chad, chad box, eighty-column mind, green card,dusty deck, lace card, card walloper. punched card
Synonyms for punched card
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