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The term telesoftware was coined by W.J.G. Overington who invented the concept in 1974; [1] it literally means “software at a distance” and it often refers to the transmission of programs for a microprocessor or home computer via broadcast teletext, though the use of teletext was just a convenient way to implement the invention, which had been invented as a theoretical broadcasting concept ...
Ceefax (/ ˈ s iː f æ k s /) was the world's first teletext information service and a forerunner to the current BBC Red Button service. Ceefax was started by the BBC in 1974 and ended, after 38 years of broadcasting, at 23:32:19 BST (11:32 PM BST) on 23 October 2012, in line with the digital switchover completion in Northern Ireland.
A conceptually similar predecessor to the software-based simulator was published by Electron User in early 1987, offering a monochrome Mode 4 simulation of the Teletext display, using the lower 25 character lines of the screen to show the Teletext output, reserving several lines at the top of the screen for a representation of Mode 7 used to ...
Development of a French teletext-like system began in 1973. A very simple 2-way videotex system called Tictac was also demonstrated in the mid-1970s. As in the UK, this led on to work to develop a common display standard for videotex and teletext, called Antiope, which was finalised in 1977. Antiope had similar capabilities to the UK system for ...
Viditel was introduced on 7 August 1980, and required a Vidimodem as well as a compatible home computer (one such example was the Philips P2000T which had a built-in Teletext chip) or a television set which could support Teletext; the required equipment itself would cost anywhere between 3,000 and 5,000 Dutch guilders overall. Viditel was shut ...
Teletext, or broadcast teletext, is a standard for displaying text and rudimentary graphics on suitably equipped television sets. [ 1 ] [ 2 ] Teletext sends data in the broadcast signal, hidden in the invisible vertical blanking interval area at the top and bottom of the screen. [ 3 ]
The BBC with Teletext Adaptor on the right. The teletext-like "Mode 7" display mode inside the 8-bit BBC Micros made a broadcast teletext adapter an obvious expansion, and the BBC would broadcast telesoftware free over Ceefax. The hardware and software design was created by Graham Toal. [39]
A 1979 SAA5050 in a VDU card for Acorn Eurocard systems. The Mullard SAA5050 was a character generator chip for implementing the Teletext character set. [1]Printed circuit board used in a Philips Viewdata unit, featuring a SAA5050 character generator.