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Encyclopedia > Storage tube

Mostly obsolete, a storage tube is a special monochromatic CRT whose screen has a kind of 'memory' (hence the name): when a portion of the screen is illuminated by the CRT's electron gun, it stays lit until a screen erase command is given. Thus, screen update commands need only be sent once and this allows the use of a slower data connection, typically serial—a feature very well adapted to computer terminal use in 1960s and 70s computing. The two main advantages were: The cathode ray tube or CRT, invented by Karl Ferdinand Braun, is the display device used in most computer displays, video monitors, televisions and oscilloscopes. ... An electron gun is a component that produces an electron stream that has a precise kinetic energy, being used in all TVs and monitors which use cathode ray tube technology. ... In telecommunications and computer science, serial communications refers to any data transmission scheme in which data is sent one symbol at one time, sequentially over a communications channel. ... A computer terminal is an electronic or electromechanical hardware device used for entering data into, and displaying data from, a computer or a computing system. ...

  • Very low bandwidth needs compared to vector graphics displays, thus allowing much longer cable distances between computer and terminal
  • No need for display-local RAM (as in modern terminals), which was prohibitively expensive at the time.

Generally speaking, storage tubes could be divided into two categories. In the more common category, they were only capable of storing "binary" images; any given point on the screen was either illuminated or dark. The Tektronix Direct-View Bistable Storage Tube was perhaps the most-famous example in this category. Other storage tubes were able to store greyscale/halftoned images; the tradeoff was usually a much-reduced storage time. // Analog For analog signals, which can be mathematically viewed as a function of time, bandwidth is the width, measured in hertz, of a frequency range in which the signals Fourier transform is nonzero. ... Steam Locomotive 7646 as a vector, originally Windows Metafile (converted to GIF for display on Wikipedia page). ... Different types of RAM. From top to bottom: DIP, SIPP, SIMM 30 pin, SIMM 72 pin, DIMM, RIMM RAM redirects here. ... Look up binary in Wiktionary, the free dictionary Binary may mean: In mathematics and computer science, the binary (base-two) numeral system is a representation for numbers that uses only zeroes and ones as digits. ... DVBST was an acronym used by Tektronix to describe their line of Direct-View Bistable Storage Tubes. These were cathode ray tubes (CRTs) that stored information written to them using an analog technique inherent in the CRT and based upon the secondary emission of electrons. ... In computing, a grayscale or greyscale digital image is an image in which the value of each pixel is a single sample. ... Halftoning is a method of printing shades using a single color ink. ...

Two pioneering storage tube displays were MIT Project MAC's ARDS (Advanced Remote Display Station) and Tektronix's 4014, the latter becoming a de facto computer terminal standard some time after its introduction (later being emulated by other systems due to this status). Project MAC, later the MIT Laboratory for Computer Science (LCS), was a research laboratory at MIT. Project MAC would become famous for groundbreaking research in operating systems, artificial intelligence, and the theory of computation. ... The Tektronix 4014 was an early text and graphics computer terminal based on the companys own storage tube technology. ... De facto is a Latin expression that means in fact or in practice. It is commonly used as opposed to de jure (meaning by law) when referring to matters of law or governance or technique (such as standards), that are found in the common experience as created or developed without...

See also

  Results from FactBites:
Ball storage and dispensing device and method of manufacture - Patent 6481595 (2045 words)
A ball storage and dispensing device in accordance with this invention comprises a one-piece, hollow cylindrical storage tube or cartridge for holding a stack of balls, the tube having an internal diameter throughout substantially its entire length that is larger than the largest diameter ball with which the device is intended to be used.
Either before or after drilling the tube, the lower end of the tube is heated, as by the use of a heat gun, causing a portion of the lower end of the tube to become pliable.
Storage and dispensing devices 20 of this invention made from a thermoplastic material are inexpensive to manufacture and have no moving parts to wear or break.
  More results at FactBites »



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