different between videotex vs viewdata

English

video +? text

videotex (usually uncountable, plural videotexes)

Any of various early information retrieval services, such as viewdata and Teletext systems, that delivered pages of computerized text to users on request.
- 1980, IEEE Computer Society, Computer
  A variety of extensions of this basic videotex terminal can be foreseen.
- 1984, The Radio and Electronic Engineer
  In this paper, the development of a microprocessor based system for converting videotex pages to synthetic speech in real time, for the benefit of blind people, is described.

view +? data

viewdata (usually uncountable, plural viewdatas)

(often attributive) An information retrieval service of the 1970s and 1980s permitting subscribers to access a remote database and receive requested data on a video display.
- 1980, InfoWorld (volume 2, number 1)
  Touch-tone teletext provides many of the services of viewdata and teletext at the low cost intended for teletext alone.
- 1981, New Scientist
  The two European systems use an "alphamosaic" method of delivering data to a viewdata terminal screen.

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