Legacy systems: Legacy system, Videotex, Viewdata, Prestel, Teletext, Pick operating system, Minitel, List of Teletext systems, Micronet800

 
9781157607502: Legacy systems: Legacy system, Videotex, Viewdata, Prestel, Teletext, Pick operating system, Minitel, List of Teletext systems, Micronet800
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 37. Chapters: Legacy system, Videotex, Viewdata, Prestel, Teletext, Pick operating system, Minitel, List of Teletext systems, Micronet800, Compunet, TOPS, Characterization test, Cab Secure Radio, Legacy mode, CHILL, Legacy code, SabreTalk, Legacy port, Alex, Legacy costs, Standalone program, ORCATS, Indexed file. Excerpt: Prestel (abbrev. from press telephone), the brand name for the UK Post Office's Viewdata technology, was an interactive videotex system developed during the late 1970s and commercially launched in 1979. The innovations on which it was based were credited to Samuel Fedida at the then Post Office Research Station in Martlesham, Suffolk. In 1978 a team of programmers was recruited from within the Post Office Data Processing Executive. Under the management of David Wood they developed the software for the public access Prestel system. In 1983 as privatisation of British Telecom loomed the staff of the software development team were moved into the Prestel Division of BT. The public Prestel database consisted of a set of individual frames, which were arranged in 24 lines of 40 characters each, similar to the display used by the Ceefax and ORACLE teletext services provided by the BBC and ITV television companies. Of these, the top line was reserved for the name of the Information Provider, the price and the page number, and the bottom line was reserved for system messages. Thus there remained 22 lines (of 40 characters each) in which the Information Provider (IP) could present information to the end user. Each frame was stored in a block of 1 kilobyte (1024 bytes), out of which at least 104 bytes were reserved for routing and system information. This left 920 bytes for the frame contents, 716 bytes in the case of response frames. The IP logo on line 1 occupied at least 43 bytes, depending on the number of control chara...

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