BTX meaning in Computing ?

Answer: What is Bildschirmtext mean?

Bildschirmtext (German "screen text", abbrev. Btx or BTX) was an online videotex system launched in West Germany in 1983 by the Deutsche Bundespost, the (West) German postal service. Btx originally required special hardware (it was based on GEC 4000 series computers) which had to be bought or rented from the British General Post Office. The data was transmitted through the telephone network using V.23 modems and the content was displayed on a television set.

Originally conceived to follow the UK Prestel specifications, and developed on contract by a small UK company called Systems Designers Ltd (originally merged into EDS and now part of HP) for IBM Germany. Btx added a number of additional features before launch, including some inspired by the French Minitel service, to create a new display standard of its own, which in 1981 was designated the CEPT1 profile. A trial system was installed in Düsseldorf and Berlin in 1980. In 1995 an enhanced backward-compatible standard called Kernel for Intelligent Communication Terminals (KIT) was announced, but this never really gained acceptance. CEPT permits the transmission of graphical pages with a resolution of 480 by 250 pixels, where 32 out of a palette of 4096 colors could be shown at the same time. This corresponds to the technical possibilities of the early 1980s.

Btx always transferred whole screen pages; the receiver paid per received page. The content provider was free to set the price, and could require either a fee per page (0.01 DM to 9.99 DM), or a time-dependent fee (0.01 DM to 1.30 DM per minute).

The last Btx access was switched off at the end of 2001 by Deutsche Telekom; it had been made obsolete by the Internet. However, Btx formed the basis of T-Online, Deutsche Telekom's online service, which maintained a Btx interface in its access software after the T-Online brand was introduced in 1995.

After German reunification, Btx was available throughout Germany. Btx was also available in Austria and Switzerland, where it was called Videotex (VTX).

Data was transferred unauthenticated and in plaintext, leading to the well-known BTX hack by Wau Holland in 1984. The BTX hack remains well known in German computer science folklore.

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