- Edge-notched card
Edge-notched cards, or McBee cards, were a manual data storage and manipulation technology invented in 1896 and used for specialized data storage and cataloging applications through much of the 20th century. While there were many variants, a popular version consisted of 5 inch by 8 inch paperboard cards with holes punched at regular intervals along all four edges, a short distance in from the edges. To record data, the paper stock between a hole and the nearest edge was removed by a special notching tool. The holes were assigned a meaning dependent upon a particular application. For example, one hole might record the answer to a yes/no question on a survey, with the presence of a notch meaning yes. More complex data was encoded using a variety of schemes, often using a superimposed code. The center of the card might be blank space for information to be written, or contain a pre-printed form.
To allow a visual check that all cards in a deck were oriented the same way, one corner of each card was beveled, much like Hollerith punched cards. Edge-notched cards, however, were not intended to be read by machines. Instead, they were manipulated by passing one or more slim needles through selected holes in a group of cards. As the needles were lifted, the cards that were notched in the hole positions where the needles were inserted would be left behind as rest of the deck was lifted by the needles. Using two or more needles produced a logical and function. Combining the cards from two different selections produced a logical or. Quite complex manipulations, including sorting were possible using these techniques.
Before the widespread use of computers, some public libraries used a system of small edge-notched cards in paper pockets in the back of library books to keep track of them.
- Williams, Robert V. (2002). "Punched Cards: A Brief Tutorial". IEEE Annals - Web extra. http://www.computer.org/portal/site/annals/menuitem.8933248930f8c11dbe1fbe108bcd45f3/index.jsp?&pName=annals_level1&path=annals/content&file=punchedcards.xml&xsl=article.xsl. Retrieved 2006-10-30.
- Paper by Douglas C. Engelbart from 1962 Augmenting Human Intellect, discussing use of edge-notched cards to partially model Vannevar Bush's Memex concept.
- The McBee Keysort System for Mechanically Sorting Folklore Data The Journal of American Folklore , Vol. 66, No. 262, Oct. - Dec., 1953
Wikimedia Foundation. 2010.
Look at other dictionaries:
Index card — An index card is heavy paper stock cut to a standard size. Index cards are often used for recording individual items of information that can then be easily rearranged and filed. The most common size in the United States and Russia is 3 in by 5 in … Wikipedia
Punched card — Overpunch redirects here. For the code, see Signed overpunch. A punched card, punch card, IBM card, or Hollerith card is a piece of stiff paper that contains digital information represented by the presence or absence of holes in predefined… … Wikipedia
Zatocoding — Système de sélection inventé par en 1952 par Calvin Mooers, fondateur de la Zator Company en recherche documentaire fondé sur un sélecteur automatique de fiches préperforées, les Zatocards , et utilisé entre 1952 et 1978. Alliage des codes et… … Wikipédia en Français
Data storage device — Many different consumer electronic devices can store data … Wikipedia
Barcode — For the taxonomic method, see DNA barcoding. A UPC A barcode symbol A barcode is an optical machine readable representation of data, which shows data about the object to which it attaches. Originally barcodes represented data by varying the… … Wikipedia
Punched tape — Five hole and eight hole punched paper tape Punched tape or paper tape is an obsolete form of data storage, consisting of a long strip of paper in which holes are punched to store data. It was widely used during much of the twentieth century for… … Wikipedia
Computer data storage — 1 GB of SDRAM mounted in a personal computer. An example of primary storage … Wikipedia
File server — In computing, a file server is a computer attached to a network that has the primary purpose of providing a location for shared disk access, i.e. shared storage of computer files (such as documents, sound files, photographs, movies, images,… … Wikipedia
Optical mark recognition — (also called Optical Mark Reading and OMR) is the process of capturing human marked data from document forms such as surveys and tests. Contents 1 OMR background 2 OMR software 2.1 Open Source … Wikipedia
Network-attached storage — Not to be confused with Storage area network. Network attached storage Connects to Local area network via: Ethernet Hard drives via one of: SATA SAS USB Fibre Channel Common manufacturers HP NetApp Dell Cisco … Wikipedia