Early video programming systems and electronic programme display data was broadcast using the teletext system as a base. Text can 'flash' and also be 'concealed' (press the 'Reveal' button on your remote controller to make the text visible). Developed by the BBC and IBA in the late '70s, this simple text service provides a 40x25 text screen which can display text in eight colours (which may include coloured backgrounds). chances are good that you have come across teletext services. It will be able to carry hundreds or thousands of services and these would include people's personal teletext services and the many services recovered from tape.If you are European, Japanese, Australian, etc. In fact anyone can type on the same page and collaborate. As you edit a page anyone viewing that page will see your keystrokes as you type. "The next iteration will be web based with instant transmission. The teletexters are currently hard at work planning the inaugural Teletext Festival at the National Centre for Computing History - so the same system is being revived again, this time as a permanent thing.īut where can it go next? Peter says that he sees the current setup as a "transitional" system. In fact, his work has even won him a 'residency' on German network ARD's own teletext service. The service currently has a number of contributors, including artist Dan Farrimond who has produced some truly magnificent graphics, despite the limitations inherent in teletext. It's perfect for Teefax because it means individual pages can be modified and within two minutes of changes being uploaded (or "committed", in the jargon), the updates will be visible on all Raspberry Pis running Teefax. Subversion is a software versioning system, which enables people to edit parts of a project remotely and then save their changes and synchronize with everyone else - with no one's work being overwritten by accident. "Then I had a brainwave in that I could use a standard package called Subversion that does all the housekeeping and is very easy to use." "To keep it up to date the screens needed to synchronise pages from a central server", Peter says. Using the Raspberry Pi, "Fringefax" was planned so that TVs around the town would display the schedule and other festival information. Having previously written wxTED, a much-needed teletext editor for modern PCs, Peter built his own text service for the town of Stroud, for its Fringe festival. He was inspired by the work of Peter Kwan, who used to work in visual effects and computer graphics - including on teletext systems for both ITV and the BBC. Forget Web 2.0 - "it would be like web zero", the man who had the idea - Carl Attrill - tells me. The ability to display real text pages has been possible for some time now - but the idea to hook it up to a central server so that it would transform into a fully fledged teletext broadcasting system is new. On page 888, where subtitles would traditionally reside, is a rolling set of (terrible) jokes that make use of the fabled "reveal" button. displays a stream of recent tweets, and page 503 even has what is presumably the world's least convenient messageboard system. There are even some pages that pull in data from the web and convert it to teletext format. At the time of writing, the service has been live for a few weeks and is more like a proof of concept - with a number of developers taking control of a few pages for themselves to share text or their best teletext art.
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