BBC:n CEEFAX - tekstitelevisio, 1974-2012, yhteisötekstitelevisio Teefax myös Raspberry Pi:llä

oh2op · ViestiKirjoittaja **oh2op** » 18.11.2020 09:49

https://theconversation.com/teletext-wa ... net-124118

A CEEFAX page from 1979. The Teletext Archaeologist - @grim_fandango

The BBC has announced that 2020 will mark the end of the Red Button text service – the final incarnation of what was originally known as CEEFAX and Oracle. Those old text-based TV services would seem ridiculously clunky and old-fashioned to an internet generation used to instant streaming and apps for everything. But – as slow and frustrating as that old text system was – it paved the way for the World Wide Web and helped prepare us for the world of social media.

To most of us, the end of the red button shouldn’t be a huge surprise – not many people can remember the last time they pulled up a Red Button text page. Nowadays, like most people, I use my smart phone for pretty much everything. The Red Button service (and its predecessors CEEFAX/Teletext) take us back to a strange and foreign country: The Place Before Internet.

CEEFAX was the world’s first text information service which started in 1974. It was joined by Independent Television’s Oracle (later renamed Teletext) in the early 1980s. Both services depended on a quirk of the old analogue TV signal. For reasons to do with the hardware (big glass cathode ray tubes and heavy electromagnets) there had to be a couple of milliseconds of pause between each frame of the moving image – and that pause was when the CEEFAX pages were transmitted.

BBC lopettaa palvelunsa uutisten ja urheilun osalta 2020.
https://www.bbc.com/news/entertainment-arts-49715314

How Teletext and Ceefax are coming back from the dead
https://www.techradar.com/news/internet ... ad-1326145

YouTube: This is CEEFAX
https://www.youtube.com/watch?v=hvLDx5ATEVU

CEEFAX-sivuja
https://www.youtube.com/watch?v=I6uzHdk4Xmk

Teefax
Teefax: a nostalgic return to the days of teletext
https://www.theguardian.com/technology/ ... f-teletext
Teletext makes a comeback with the help of the Raspberry Pi
https://magpi.raspberrypi.org/articles/teefax
Youtube: Teefax
https://www.youtube.com/playlist?list=P ... 18nOZKXWFT
Make your own Ceefax
https://www.youtube.com/watch?v=dxCqoSu-KgE

Yleisradio
Suomen Yleisradiolla on tekstitelevisiossa sivulla 590 Suomen Radioamatööriliiton ja sivulla 591 Suomen DX-liiton tuottamaa sisältöä.