different between teletext vs videotex

English

teletext (uncountable)

Alternative form of Teletext
- 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.

Borrowed from English teletext.

teletext m (invariable)

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.

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