acorn valvue - translation to ελληνικό
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acorn valvue - translation to ελληνικό

BRITISH COMPUTER COMPANY FOUNDED IN 1978
Acorn computers; Acorn, Ltd.; Acorn, Ltd; Acorn Computers Ltd; Acorn (computer); Acorn computer; Acorn Computer; Acorn 286; NewsPad; Acorn Computers Limited; Acorn Computers Ltd.
  • An Acorn NetStation NC
  • The distinctive yellow case of the [[Acorn Phoebe]]
  • The [[Acorn System 1]], upper board; this one was shipped on 9 April 1979.
  • Cambridge Workstation advert in ''[[New Scientist]]'', 24 April 1986 issue
  • March 1979 price list
  • Electron]], Acorn's sub-£200 competitor to the [[ZX Spectrum]]
  • Reader reply card in ''[[New Scientist]]'', 9 September 1989 issue
  • The Acorn Atom
  • Advert in ''[[New Scientist]]'', 31 July 1986 issue
  • The BBC micro released by Acorn in 1981
  • Principal creators of the BBC micro in 2008, some 26 years after its release
  • [[Hermann Hauser]] and [[Chris Curry]] in Cambridge
  • Risc User: NewsPad – covered in the October 1996 issue
  • ''[[Wired UK]]'', September 1996 issue, "Five Go Nuts in Cambridge: Acorn's mad rush to build the world's first Network Computer"

acorn valvue      
λυχνία υπερβραχέων κυμάτων
λυχνία υπερβραχέων κυμάτων      
acorn valvue
thermionic valve         
  • Voltage-regulator tube in operation. Low-pressure gas within tube glows due to current flow.
  • 11 mm diameter}}
  • Metal-cased tubes with octal bases
  • Whirlwind]]
  • Tube tester manufactured in 1930.
  • 10 mm diameter}} (excluding leads)
  • Batteries for a vacuum-tube circuit. The C battery is highlighted.
  • 150 kW}} of power
  • One of Edison's experimental bulbs
  • Beam power tube designed for radio frequency use.  The tube plugs in to a socket that creates an air-tight seal around the outer periphery.  A blower and duct work in the chassis force air through the tube's fins to carry away heat.  This type of tube is sometimes referred to as a “doorknob” tube, owing to its shape and size.
  • Fleming's first diodes
  • Vacuum tubes seen on end in a recreation of the World War II-era [[Colossus computer]] at [[Bletchley Park]], England
  • Triode tube type GS-9B; designed for use at radio frequencies up to 2000 MHz and rated for 300 watts anode power dissipation.<ref>[https://web.archive.org/web/20210225190032/http://www.gstube.com/data/1450/ GS-9B Oscillator Ultra-High Frequency Triode] Archived 25 Feb. 2021</ref> The finned heat sink provides conduction of heat from anode to air stream.
  • General Electric Company Pliotron, [[Science History Institute]]
  • Getter in opened tube; silvery deposit from getter
  • The pentagrid converter contains five grids between the cathode and the plate (anode)
  • u=W}} of heat
  • Dead vacuum fluorescent display (air has leaked in and the getter spot has become white)
  • 70-watt tube-hybrid audio amplifier
  • Audio power amplifier using tubes, in operation. Red-orange glow is from heated filaments.
  • The useful region of operation of the screen grid tube (tetrode) as an amplifier is limited to anode potentials in the straight portions of the characteristic curves greater than the screen grid potential.
  • Tetrode symbol. From top to bottom: plate (anode), screen grid, control grid, cathode, heater (filament).
  • Triode symbol. From top to bottom: plate (anode), control grid, cathode, heater (filament)
  • Typical Triode Plate Characteristics
  • The first triode, the de Forest [[Audion]], invented in 1906
  • Triodes as they evolved over 40 years of tube manufacture, from the RE16 in 1918 to a 1960s era miniature tube
  • Universal vacuum tube tester
  • Commercial packaging for vacuum tubes used in the latter half of the 20th century including boxes for individual tubes (bottom right), sleeves for rows of the boxes (left), and bags that smaller tubes would be put in by a store upon purchase (top right)
  • 20.4 mm}} in diameter.
  • Radio station signal generator with vacuum tubes
DEVICE THAT CONTROLS ELECTRIC CURRENT BETWEEN ELECTRODES IN AN EVACUATED CONTAINER
Vaccuum tube; Vacuum tubes; Radio tube triode; Thermionic device; Vacuum Tubes; Integrated circuit vacuum tube; Integrated vacuum tube; Field emitter vacuum tube; Thermionic valves; Firefet; Thermionic tube; Vacuum Tube; Vacuum diode; Vacuum Diode; Vaccum tube; Radio valve; 12SK7; 5U4; Electronic tube; Electrical valve; Vacuum tube types; Vacuum tube (electronics); Microtriode; Radio tube; 12AU6; 6AU6; Vacuum-tube; Miniature valve; Microtube (electronics); Microtube (Electronics); Electron valve; Vacumn tube; Thoriated tungsten; Acorn Valve; Acorn valve; Cheater cord; Thermionic valve; Valve (electronics); Vacuum tube circuit; Firebottle; Electron device; Battery valve; Indirectly heated cathode; Vacuum-tube electronics
ηλεκτρονική λυχνία

Ορισμός

Acorn Computers Ltd.
<company> A UK computer manufacturer, part of the {Acorn Computer Group} plc. Acorn was founded on 1978-12-05, on a kitchen table in a back room. Their first creation was an electronic slot machine. After the Acorn System 1, 2 and 3, Acorn launched the first commercial microcomputer - the ATOM in March 1980. In April 1981, Acorn won a contract from the BBC to provide the PROTON. In January 1982 Acorn launched the BBC Microcomputer System. At one time, 70% of microcomputers bought for UK schools were BBC Micros. The Acorn Computer Group went public on the Unlisted Securities Market in September 1983. In April 1984 Acorn won the Queen's Award for Technology for the BBC Micro and in September 1985 Olivetti took a controlling interest in Acorn. The Master 128 Series computers were launched in January 1986 and the BBC Domesday System in November 1986. In 1983 Acorn began to design the Acorn RISC Machine (ARM), the first low-cost, high volume RISC processor chip (later renamed the Advanced RISC Machine). In June 1987 they launched the Archimedes range - the first 32-bit RISC based microcomputers - which sold for under UKP 1000. In February 1989 the R140 was launched. This was the first Unix workstation under UKP 4000. In May 1989 the A3000 (the new BBC Microcomputer) was launched. In 1990 Acorn formed Advanced RISC Machines Ltd. (ARM) in partnership with Apple Computer, Inc. and VLSI to develop the ARM processor. Acorn has continued to develop RISC based products. With 1992 revenues of 48.2 million pounds, Acorn Computers was the premier supplier of Information Technology products to UK education and had been the leading provider of 32-bit RISC based personal computers since 1987. Acorn finally folded in the late 1990s. Their operating system, RISC OS was further developed by a consortium of suppliers. Usenet newsgroups: news:comp.sys.acorn, news:comp.sys.acorn.announce, news:comp.sys.acorn.tech, news:comp.binaries.acorn, news:comp.sources.acorn, news:comp.sys.acorn.advocacy, news:comp.sys.acorn.games. Acorn's FTP server (ftp://ftp.acorn.co.uk/). {HENSA software archive (http://micros.hensa.ac.uk/micros/arch.html)}. {Richard Birkby's Acorn page (http://csv.warwick.ac.uk/Acorn Computers Ltd.phudv/)}. RiscMan's Acorn page (http://geko.com.au/riscman/). Acorn On The Net (http://stir.ac.uk/Acorn Computers Ltd.rhh01/Main.html). {"The Jungle" by Simon Truss (http://csc.liv.ac.uk/users/u1smt/u1smt.html)}. [Recent history?] (2000-09-26)

Βικιπαίδεια

Acorn Computers

Acorn Computers Ltd. was a British computer company established in Cambridge, England, in 1978. The company produced a number of computers which were especially popular in the UK, including the Acorn Electron and the Acorn Archimedes. Acorn's BBC Micro computer dominated the UK educational computer market during the 1980s.

Though the company was acquired and largely dismantled in early 1999, with various activities being dispersed amongst new and established companies, its legacy includes the development of reduced instruction set computing (RISC) personal computers. One of its operating systems, RISC OS, continues to be developed by RISC OS Open. Some activities established by Acorn lived on: technology developed by Arm, created by Acorn as a joint venture with Apple and VLSI in 1990, is dominant in the mobile phone and personal digital assistant (PDA) microprocessor market.

Acorn is sometimes referred to as the "British Apple" and has been compared to Fairchild Semiconductor for being a catalyst for start-ups. In 2010, the company was listed by David Meyer in ZDNet as number nine in a feature of top ten "Dead IT giants". Many British IT professionals gained their early experiences on Acorns, which were often more technically advanced than commercially successful US hardware.