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A Viewdata machine displayed in teletext format. 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.
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. Teletext: One-way broadcast information services for displaying pages of text and pictorial material on the screens of adapted TVs. A limited choice of information pages is ...
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.
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]