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Wasn't it Telidon?
Yes it was -- Googling gives several references for telidon, none for teledon. Changed spelling, added selected external links.
Didn't Prodigy use NAPLPS???
A couple of years ago someone screengrabbed about 50 Telidon images from the TVOntario Bits and Bytes program from the 1980s. I just had some time recently to put them up on my TelidonHistoryProject.ca website. We could use a couple of them to illustrate what PDI and NAPLPS were capable of. I'm just not sure which image license to use. I think some of them are public domain, such as http://telidonhistoryproject.ca/images/tvo/edutel1/dsc00024.jpg which I put on the http://telidonhistoryproject.ca/edutel_index.html page. The TVOntario ones should be fine too. -- Jimj wpg 01:59, 20 October 2006 (UTC)
I recall, as a child, noticing that each Teleguide page was indexed by a unique ID number displayed in the corner of the screen. Curious, I punched "0123456789" into the kiosk to see what would appear. This triggered an easter egg which asked me to confirm the purchase of a Ferrari 328. I stalked quietly out of the corridor.--188.8.131.52 (talk) 20:03, 8 June 2008 (UTC)
There is also a very good article on videotex in Wikipedia which describes other national systems in addition to Telidon. I have added some background material on the use of split speed modems on the discussion page. My company Picture Data Inc. worked with Infomart and the Ontario Government on the creation of Teleguide, and did some interesting work with New York media companies on early commercialization of the medium. If anyone is still interested I would be happy to add further material or correspond.
Prodigy used NAPLPS, here is an article in The Atlantic covering it: Where Online Services Go When They Die. It might be useful for expanding this article. —f3ndot (TALK) (EMAIL) (PGP) 23:18, 14 July 2014 (UTC)