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Viewdata is a Videotex implementation. It is a type of information retrieval service in which a subscriber can access a remote database via a common carrier channel , request data and receive requested data on a video display over a separate channel.
Viewdata: An alternative term to videotex, used in particular by the British Post Office and generally in Britain and the USA. Elsewhere, the term videotex is preferred. Viewdata was coined by the BPO in the early 1970s, but found to be unacceptable as a trade name, hence its use as a generic.
Samuel Fedida, OBE (4 May 1918 – 10 August 2007) was an Egyptian-born British telecommunication engineer responsible at Post Office Telecommunications for the development of Viewdata. [1] Fedida was born in Alexandria, Egypt. [2] He had the idea for Viewdata in 1968 after reading a publication with the title The Computer as Communications ...
Meanwhile, the General Post Office (GPO), whose telecommunications division later became British Telecom, had been researching a similar concept since the late 1960s, known as Viewdata. Unlike Teledata, a one-way service carried in the existing TV signal, Viewdata was a two-way system using telephones. [22]
Prestel was the brand name of a videotex service launched in the UK in 1979 by Post Office Telecommunications, a division of the British Post Office. [a] It had around 95,500 attached terminals at its peak, [2] and was a forerunner of the internet-based online services developed in the late 20th and early 21st centuries. [3]
The SAA5050 was used in teletext-equipped television sets, viewdata terminals, and microcomputers, most notably on computers like the Philips P2000 (1980), Acorn System 2 (1980), BBC Micro (1982), Malzak and the Poly-1, [2] and Prestel adapters like the AlphaTantel. [3] [4] [5] This chip was also manufactured by Mullard for Philips.
Viewtron was an online service offered by Knight-Ridder and AT&T from 1983 to 1986. Patterned after the British Post Office's Prestel system, [1] it started as a videotex service requiring users to have a special terminal, the AT&T Sceptre.
Logo. Micronet 800 was an information provider (IP) on Prestel, aimed at the 1980s personal computer market.It was an online magazine that gave subscribers computer related news, reviews, general subject articles and downloadable telesoftware.