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Teletext News RIP
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My first programming job involved writing software in Forth for Teletext transmission systems.
The Teletext Level 1 spec (lacking its diagrams) is at archive.org, or there's Word and Postscript versions at Imperial College. Who could fail to be moved by such classic lines as:
The bit signalling rate is 6.9375 Mbits/s (±25 parts per million). It is 444 times the nominal television line frequency.
or:
The fourth and fifth Byte of every Data-Line, and a further eight Bytes of the Page-Header Data Lines, are Hamming Codes containing four 'message' bits as listed in table 1a. The bits are transmitted in numerical order from b1 to b8. -
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Originally posted by thunderlizard View PostAnybody care to predict the turn-off date of The Internet (as we know it)?My all-time favourite Dilbert cartoon, this is: BTW, a Dumpster is a brand of skip, I think.Comment
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I worked on the software for Prestel, which was identical presentation technology. State of the art for the masses before the interweb got going. I say masses, but not many people had it.
The marketing for the Italian version at the time said that porn was the most popular usage, but I never figured out how that worked on a 40x25 character-based screen. Perhaps that's why they've turned off teletext.Comment
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Originally posted by Doggy Styles View PostThe marketing for the Italian version at the time said that porn was the most popular usage, but I never figured out how that worked on a 40x25 character-based screen.My all-time favourite Dilbert cartoon, this is: BTW, a Dumpster is a brand of skip, I think.Comment
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Originally posted by RichardCranium View PostYou never downloaded & viewed porn on a CGA monitor, then? All it took was a bit of imagination.
Then again, we had test data including some really cool pages from a Californian cable station which had a designer who had become a whizz with Teletext graphics - a particularly good picture of an elephant sticks in the mind
Level 5 Teletext allowed for high quality graphics, but I don't think it was ever implemented outside the lab. The equivalent spec for Prestel was trialled as Picture Prestel: the company I worked at created the transmission systems and editing terminals for that. The editing system used a Torch (basically a reboxed BBC Micro with a Z80 second processor hanging off The Tube) with a custom decoder card attached.Comment
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