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viewdata wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 design toggle design subsection 1 1 keypad symbols the sextile and the square 2 uses toggle uses subsection 2 1 travel industry 2 2 bulletin board systems 3 see also 4 references 5 external links toggle the table of contents viewdata 3 languages español français svenska edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia information retrieval service and legacy system viewdata viewdata graphics used in the experimental phone directory of post office telecommunications in 1977 the image is a graphical representation of the post office british telecom research laboratories adastral park in suffolk england note the _ to continue rather than the correct to continue showing a common rendering error developer samuel fedida post office type videotex launched 1974 52 years ago 1974 platform viewdata a viewdata machine displayed in teletext format viewdata is a videotex implementation it is a type of information retrieval service in which a subscriber can access a remote database via a common carrier channel request data and receive requested data on a video display over a separate channel samuel fedida who had the idea for viewdata in 1968 was credited as inventor of the system which was developed while working for the british post office which was the operator of the national telephone system the first prototype became operational in 1974 the access request and reception are usually via common carrier broadcast channels this is in contrast with teletext design edit viewdata offered a display of 40 24 characters based on iso 646 irv ia5 7 bits with no accented characters 1 originally viewdata was accessed with a special purpose terminal or emulation software and a modem running at itu t v 23 speed 1 200 bit s down 75 bit s up 1 by 2004 it was normally accessed over tcp ip using viewdata client software on a personal computer running microsoft windows or using a web based emulator keypad symbols the sextile and the square edit o viewdata keypad symbols in unicode u 2317 viewdata square u 26b9 sextile different from different from u 002a asterisk ast midast u 0023 number sign num detail of a telephone keypad displaying the sextile and viewdata square detail of a more recent telephone keypad in which typographic asterisk and number sign have replaced the itu star and square viewdata uses special symbols already widely available on telephone keypads the star key and the square key as formally recommended by the international telecommunication union 2 the ascii asterisk and number sign are sometimes used instead because they are regular symbols on computer keyboards although they do not match the itu specification 3 on telephones use of the number sign hash symbol has become the norm rather than the exception these symbols appear as u 26b9 sextile and u 2317 viewdata square in the miscellaneous symbols and miscellaneous technical unicode blocks respectively the sextile was added due to its use in astrology 3 and the square had previously appeared in the bs_viewdata character set as a replacement for the underscore 4 in 2013 the german national body submitted a unicode technical committee proposal to align the unicode reference glyphs with the itu specifications for these symbols and annotate them as telephone keypad symbols on the code charts 3 as of 2019 update unicode 12 1 these changes have not been accepted implemented 5 uses edit travel industry edit as of 2015 viewdata was still in use in the united kingdom mainly by the travel industry travel agents use it to look up the price and availability of package holidays and flights once they find what the customer is looking for they can place a booking as of 2019 viewdata is only used by a handful of travel agents 6 bulletin board systems edit this section does not cite any sources please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed june 2023 learn how and when to remove this message a number of viewdata bulletin board systems existed in the 1980s predominantly in the uk due to the proliferation of the bbc micro and a short lived viewdata revival appeared in the late 1990s fuelled by the retrocomputing vogue some viewdata boards still exist with accessibility in the form of java telnet clients see also edit prestel references edit 1 2 proceedings of the videotex in europe pdf 1979 07 19 retrieved 2023 12 26 e 161 arrangement of digits letters and symbols on telephones and other devices that can be used for gaining access to a telephone network international telecommunication union 2 february 2001 retrieved 23 december 2019 1 2 3 karl pentzlin 28 october 2013 proposal to incorporate two telephony symbols into unicode by glyph and annotation changes pdf utc l2 13 105r archived pdf from the original on 2022 10 09 retrieved 23 december 2019 bsi 1981 06 01 alphanumerics for viewdata and broadcast teletext pdf itscj ipsj iso ir 47 unicode consortium miscellaneous technical pdf the unicode standard archived pdf from the original on 2022 10 09 agents vote for return of viewdata in online poll travel weekly retrieved 2025 12 03 external links edit definition at the institute for telecommunication sciences celebrating the viewdata revolution including several prestel brochures vd view a viewtex web client for teefax telstar ccl4 and nxtel vidtex an ncurses terminal client for teefax telstar ccl4 nxtel and others this article incorporates public domain material from federal standard 1037c general services administration archived from the original on 2022 01 22 v t e videotex services viewdata 1975 telidon 1978 prestel 1979 viditel 1980 minitel 1982 viewtron 1983 bildschirmtext 1983 boston citinet 1983 captain 1983 genesis storytime 1983 beltel 1985 microtex 666 1986 bistel 1986 alex 1988 irish minitel 1988 singapore teleview 1991 terminals bbc micro 1981 mupid 1981 nabu 1982 at t sceptre 1983 alextel 1988 singapore teleview terminal 1991 standards naplps cept videotex character set antiope commons category retrieved from https en wikipedia org w index php title viewdata oldid 1373419958 categories computer network technology history of computing in the united kingdom history of telecommunications in the united kingdom legacy systems videotex hidden categories articles with short description short description matches wikidata articles containing potentially dated statements from 2019 all articles containing potentially dated statements articles needing additional references from june 2023 all articles needing additional references wikipedia articles incorporating text from the federal standard 1037c this page was last edited on 5 september 2026 at 21 53 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents viewdata 3 languages add topic