different between videotext vs videotex

English

videotext (uncountable)

Alternative form of videotex
- 1989, University of Maryland at College Park, Washington journalism review
  Despite the industry's failures in launching videotext services (electronically disseminated news and information) for general consumers several years ago, such systems are definitely a major part of the future.

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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