olemus
ajalooline interaktiivne tekstiedastuse tehnoloogia/süsteem
Wiktionary:
any of various early information retrieval services, such as viewdata and Teletext systems, that delivered pages of computerized text to users on request

ülevaateid
https://en.wikipedia.org/wiki/Videotex
https://en.wikipedia.org/wiki/Videotex_character_set
https://www.its.bldrdoc.gov/publications/download/80-50_ocr.pdf