[[Category:Network]]
Teletext offers one-directional data transmission, broadcast via television signal.
Commonly it is found in analogue television signals and contains data for text and crude graphics. Digital televisions have text services which use a different method (almost HTML based).
Teletext is also "Mode 7" on the BBC Micro.
Most commonly, Teletext decoders are built-in in (newer) television sets. Aside from that, there have been also Teletext interfaces for computers.
Telesoftware was as service that allowed to download computer software, encoded in Teletext pages. Although no longer supported, Telesoftware recordings '''may be still found on old VHS Video Cassettes'''.
* '''CEEFAX''' - The British BBC CEEFAX supported Telesoftware from 1983 to 1989 (mainly for BBC computers). Apparently named because you can "see facts" which sounds like "Ceefax".
* '''ORACLE''' - The British Channel 4 ORACLE also supported Telesoftware (for different systems, including Amstrad. According to a [[:File:Volex Teletext Advert (Your Computer, March 1987).jpg|Volex Advert]], ORACLE also worked on broadcasting [[CP/M]] software).