SherbyNet - /page/wikibook/entry.mu

Micron Document

<!DOCTYPE html>

<title>Viewdata</title>

</head>

<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Viewdata</span></span>

</h1>

</header>

/* start https://en.wikipedia.org/ */

.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}

/* end https://en.wikipedia.org/ */

</style><table class="infobox vevent"><caption class="infobox-title summary">Viewdata</caption><tbody><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"></span><div class="infobox-caption">Viewdata Graphics used in the experimental phone directory of <a href="Post_Office_Telecommunications" class="mw-redirect" title="Post Office Telecommunications">Post Office Telecommunications</a> in 1977. <br>The image is a graphical representation of the Post Office/<a href="British_Telecom" class="mw-redirect" title="British Telecom">British Telecom</a> Research laboratories (<a href="Adastral_Park" title="Adastral Park">Adastral Park</a>) in <a href="Suffolk" title="Suffolk">Suffolk</a>, England. Note the "_ to continue" rather than the correct "⌗ to continue", showing a common rendering error.</div></td></tr><tr><th scope="row" class="infobox-label">Developer</th><td class="infobox-data"><a href="Samuel_Fedida" title="Samuel Fedida">Samuel Fedida</a>, <a href="General_Post_Office" title="General Post Office">Post Office</a></td></tr><tr><th scope="row" class="infobox-label">Type</th><td class="infobox-data"><a href="Videotex" title="Videotex">Videotex</a></td></tr><tr><th scope="row" class="infobox-label">Launch date</th><td class="infobox-data">1974<span style="display:none"> (<span class="bday dtstart published updated">1974</span>)</span></td></tr><tr><th scope="row" class="infobox-label"><a href="Computing_platform" title="Computing platform">Platform(s)</a></th><td class="infobox-data">Viewdata</td></tr></tbody></table>

<p><b>Viewdata</b> is a <a href="Videotex" title="Videotex">Videotex</a> implementation. It is a type of <a href="Information_retrieval" title="Information retrieval">information retrieval</a> service in which a <a href="Subscriber" class="mw-redirect" title="Subscriber">subscriber</a> can <a href="Access_control" title="Access control">access</a> a remote <a href="Database" title="Database">database</a> via a <a href="Common_carrier" title="Common carrier">common carrier</a> <a href="Communication_channel" title="Communication channel">channel</a>, request <a href="Data" title="Data">data</a> and receive requested data on a <a href="Video" title="Video">video</a> display over a separate channel. <a href="Samuel_Fedida" title="Samuel Fedida">Samuel Fedida</a>, who had the idea for Viewdata in 1968, was credited as inventor of the system which was developed while working for the British <a href="General_Post_Office" title="General Post Office">Post Office</a> 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 <a href="Teletext" title="Teletext">teletext</a>.

</p>

<div class="mw-heading mw-heading2"><h2 id="Design">Design</h2></div>

<p>Viewdata offered a display of 40×24 characters, based on <a href="ISO_646" class="mw-redirect" title="ISO 646">ISO 646</a> (IRV IA5) – 7 bits with no accented characters.<sup id="cite_ref-aei_1-0" class="reference"><a href="#cite_note-aei-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

Originally, Viewdata was accessed with a special purpose <a href="Computer_terminal" title="Computer terminal">terminal</a> (or <a href="Emulator" title="Emulator">emulation software</a>) and a <a href="Modem" title="Modem">modem</a> running at <a href="ITU-T" title="ITU-T">ITU-T</a> <a href="ITU-T_V.23" title="ITU-T V.23">V.23</a> speed (1,200 bit/s down, 75 bit/s up).<sup id="cite_ref-aei_1-1" class="reference"><a href="#cite_note-aei-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> By 2004, it was normally accessed over <a href="TCP/IP" class="mw-redirect" title="TCP/IP">TCP/IP</a> using Viewdata <a href="Client_software" class="mw-redirect" title="Client software">client software</a> on a <a href="Personal_computer" title="Personal computer">personal computer</a> running <a href="Microsoft_Windows" title="Microsoft Windows">Microsoft Windows</a>, or using a Web-based emulator.

</p>

<table class="infobox" style="max-width:20em;"><tbody><tr><th colspan="2" class="infobox-above" style="background: #ccc; font-size: 500%; line-height:1.3; font-weight:normal; font-family:'times new roman', times, georgia, serif, sans-serif;">⌗ ⚹</th></tr><tr><th colspan="2" class="infobox-header" style="background: #ccc;"><div style="background: #ccc; font-size: 125%; font-weight: bold; padding: 0.1em 0.25em 0.2em; line-height: 1.2em;">Viewdata keypad symbols</div></th></tr><tr><th scope="row" class="infobox-label">In <a href="Unicode" title="Unicode">Unicode</a></th><td class="infobox-data"><span class="nowrap"><style data-mw-deduplicate="TemplateStyles:r886049734">

/* start https://en.wikipedia.org/ */

.mw-parser-output .monospaced{font-family:monospace,monospace}

/* end https://en.wikipedia.org/ */

</style><span class="monospaced">U+2317</span> </span><span style="font-size:125%;line-height:1em">⌗</span> <span style="font-variant: small-caps; text-transform: lowercase; font-feature-settings: 'onum'">VIEWDATA SQUARE</span><br> <span class="nowrap"><span class="monospaced">U+26B9</span> </span><span style="font-size:125%;line-height:1em">⚹</span> <span style="font-variant: small-caps; text-transform: lowercase; font-feature-settings: 'onum'"><a href="%E2%9A%B9" class="mw-redirect" title="⚹">SEXTILE</a></span></td></tr><tr><th colspan="2" class="infobox-header" style="background: #ccc;">Different from</th></tr><tr><th scope="row" class="infobox-label">Different from</th><td class="infobox-data"><span class="nowrap"><span class="monospaced">U+002A</span> </span><span style="font-size:125%;line-height:1em">*</span> <span style="font-variant: small-caps; text-transform: lowercase; font-feature-settings: 'onum'"><a href="*" class="mw-redirect" title="*">ASTERISK</a></span> (<span class="monospaced">&ast;, &midast;</span>)<br><span class="nowrap"><span class="monospaced">U+0023</span> </span><span style="font-size:125%;line-height:1em">#</span> <span style="font-variant: small-caps; text-transform: lowercase; font-feature-settings: 'onum'"><a href="Number_sign" title="Number sign">NUMBER SIGN</a></span> (<span class="monospaced">&num;</span>)</td></tr></tbody></table>

<p>Viewdata uses special symbols already widely available on telephone keypads: the <style data-mw-deduplicate="TemplateStyles:r1249182868">

/* start https://en.wikipedia.org/ */

.mw-parser-output .keyboard-key{border:1px solid #aaa;border-radius:0.2em;box-shadow:0.1em 0.1em 0.2em rgba(0,0,0,0.1);background-color:var(--background-color-neutral-subtle,#f8f9fa);background-image:linear-gradient(to bottom,var(--background-color-neutral,#eaecf0),var(--background-color-neutral-subtle,#f8f9fa),var(--background-color-neutral,#eaecf0));color:var(--color-base,#202122);padding:0.1em 0.3em;font-family:inherit;font-size:0.85em}

/* end https://en.wikipedia.org/ */

</style><kbd class="keyboard-key nowrap">⚹</kbd> "star" key and the <kbd class="keyboard-key nowrap">⌗</kbd> "square" key, as formally standardised by the <a href="International_Telecommunication_Union" title="International Telecommunication Union">International Telecommunication Union</a>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> These are often treated as approximately corresponding to the ASCII <a href="Asterisk" title="Asterisk">asterisk</a> (*) and <a href="Number_sign" title="Number sign">number sign</a> (#), which do not necessarily conform to the ITU specifications for the keypad symbols; the asterisk is also usually displayed smaller and raised.<sup id="cite_ref-L213105r_3-0" class="reference"><a href="#cite_note-L213105r-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>

</p><p>These symbols appear as 'Sextile' and 'Viewdata square' in the <a href="Miscellaneous_Symbols" title="Miscellaneous Symbols">Miscellaneous Symbols</a> and <a href="Miscellaneous_Technical" title="Miscellaneous Technical">Miscellaneous Technical</a> Unicode blocks, respectively. The sextile was added due to <a href="Astrological_aspect" title="Astrological aspect">its use in astrology</a>,<sup id="cite_ref-L213105r_3-1" class="reference"><a href="#cite_note-L213105r-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> and the square had previously appeared in the <a href="ISO/IEC_646#Variant_comparison_chart" title="ISO/IEC 646">BS_Viewdata</a> character set, as a replacement for the underscore.<sup id="cite_ref-ISO-IR-047_4-0" class="reference"><a href="#cite_note-ISO-IR-047-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>

</p><p>In 2013, the German national body submitted a <a href="Unicode_Consortium" title="Unicode Consortium">Unicode Technical Committee</a> 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.<sup id="cite_ref-L213105r_3-2" class="reference"><a href="#cite_note-L213105r-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> As of 2019 (Unicode 12.1), these changes have not been accepted/implemented.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading3"><h3 id="Travel_industry">Travel industry</h3></div>

<p>As of 2015, Viewdata was still in use in the <a href="United_Kingdom" title="United Kingdom">United Kingdom</a>, mainly by the <a href="Travel_industry" class="mw-redirect" title="Travel industry">travel industry</a>. <a href="Travel_agent" class="mw-redirect" title="Travel agent">Travel agents</a> use it to look up the price and availability of <a href="Package_holiday" class="mw-redirect" title="Package holiday">package holidays</a> and <a href="Commercial_aviation" title="Commercial aviation">flights</a>. Once they find what the customer is looking for they can place a booking.

</p><p>There are a number of factors still holding up a move to a <a href="World_Wide_Web" title="World Wide Web">Web</a>-based standard. Viewdata is regarded within the industry as low-cost and reliable, travel consultants have been trained to use Viewdata and would need training to book holidays on the Internet, and <a href="Tour_operator" title="Tour operator">tour operators</a> cannot agree on a Web-based standard.

</p>

<div class="mw-heading mw-heading3"><h3 id="Bulletin_board_systems">Bulletin board systems</h3></div>

/* start https://en.wikipedia.org/ */

.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}

/* end https://en.wikipedia.org/ */

</style>

<p>A number of Viewdata <a href="Bulletin_board_system" title="Bulletin board system">bulletin board systems</a> existed in the 1980s, predominantly in the UK due to the proliferation of the <a href="BBC_Micro" title="BBC Micro">BBC Micro</a>, and a short-lived <i>Viewdata Revival</i> appeared in the late 1990s fuelled by the <a href="Retrocomputing" title="Retrocomputing">retrocomputing</a> vogue. Some Viewdata boards still exist, with accessibility in the form of <a href="Java_(Sun)" class="mw-redirect" title="Java (Sun)">Java</a> <a href="Telnet" title="Telnet">Telnet</a> clients.

</p>

<ul><li><a href="Prestel" title="Prestel">Prestel</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

/* start https://en.wikipedia.org/ */

.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}

/* end https://en.wikipedia.org/ */

</style><div class="reflist">

/* start https://en.wikipedia.org/ */

.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("./mw/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("./mw/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("./mw/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("./mw/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}

/* end https://en.wikipedia.org/ */

</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://aei.pitt.edu/94572/1/videotex.pdf">"Proceedings of the Videotex in Europe"</a> <span class="cs1-format">(PDF)</span>. 1979-07-19<span class="reference-accessdate">. Retrieved <span class="nowrap">2023-12-26</span></span>.</cite></span>

</li>

<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-E.161-200102-I/en">"E.161 : Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network"</a>. <a href="International_Telecommunication_Union" title="International Telecommunication Union">International Telecommunication Union</a>. 2 February 2001<span class="reference-accessdate">. Retrieved <span class="nowrap">23 December</span> 2019</span>.</cite></span>

</li>

<li id="cite_note-L213105r-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-L213105r_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-L213105r_3-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-L213105r_3-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><cite id="CITEREFKarl_Pentzlin2013" class="citation web cs1">Karl Pentzlin (28 October 2013). <a rel="nofollow" class="external text" href="https://unicode.org/L2/L2013/13105r-telephony.pdf">"Proposal to incorporate two telephony symbols into Unicode by glyph and annotation changes"</a> <span class="cs1-format">(PDF)</span>. UTC L2/13-105R. <a rel="nofollow" class="external text" href="https://ghostarchive.org/archive/20221009/https://unicode.org/L2/L2013/13105r-telephony.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2022-10-09<span class="reference-accessdate">. Retrieved <span class="nowrap">23 December</span> 2019</span>.</cite></span>

</li>

<li id="cite_note-ISO-IR-047-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-ISO-IR-047_4-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFISO-IR-471981" class="citation cs1"><a href="BSI_Group" title="BSI Group">BSI</a> (1981-06-01). <a rel="nofollow" class="external text" href="https://itscj.ipsj.or.jp/ir/047.pdf"><i>Alphanumerics for viewdata and broadcast teletext</i></a> <span class="cs1-format">(PDF)</span>. ITSCJ/<a href="Information_Processing_Society_of_Japan" title="Information Processing Society of Japan">IPSJ</a>. <a href="ISO-IR" class="mw-redirect" title="ISO-IR">ISO-IR</a>-47.</cite></span>

</li>

<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite id="CITEREFUnicode_Consortium" class="citation web cs1"><a href="Unicode_Consortium" title="Unicode Consortium">Unicode Consortium</a>. <a rel="nofollow" class="external text" href="https://www.unicode.org/charts/PDF/U2300.pdf">"Miscellaneous Technical"</a> <span class="cs1-format">(PDF)</span>. <i>The Unicode Standard</i>. <a rel="nofollow" class="external text" href="https://ghostarchive.org/archive/20221009/https://www.unicode.org/charts/PDF/U2300.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2022-10-09.</cite></span>

</li>

</ol></div></div>

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><a rel="nofollow" class="external text" href="http://www.its.bldrdoc.gov/fs-1037/dir-039/_5795.htm">Definition at The Institute for Telecommunication Sciences</a></li>

<li><a rel="nofollow" class="external text" href="http://www.viewdata.org.uk/">Celebrating the Viewdata Revolution</a> Including several Prestel Brochures</li>

<li><a rel="nofollow" class="external text" href="https://vd-view.azurewebsites.net/">vd-view</a> A Viewtex web client for TeeFax, Telstar, CCl4 and NXTel</li>

<li><a rel="nofollow" class="external text" href="https://github.com/simonlaszcz/vidtex">vidtex</a> An ncurses/terminal client for TeeFax, Telstar, CCl4, NXTel and others</li>

/* start https://en.wikipedia.org/ */

.mw-parser-output .citation{word-wrap:break-word}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}

/* end https://en.wikipedia.org/ */

</style><span class="citation 1037C"><span class="noviewer" typeof="mw:File"><span></span></span> This article incorporates <a href="Copyright_status_of_works_by_the_federal_government_of_the_United_States" title="Copyright status of works by the federal government of the United States">public domain material</a> from <cite class="citation cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20220122224547/https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm"><i>Federal Standard 1037C</i></a>. <a href="General_Services_Administration" title="General Services Administration">General Services Administration</a>. Archived from <a rel="nofollow" class="external text" href="https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm">the original</a> on 2022-01-22.</cite></span></li></ul>

/* start https://en.wikipedia.org/ */

.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist dd::after,.mw-parser-output .hlist li::after{content:" · ";font-weight:bold}.mw-parser-output .hlist dd:last-child::after,.mw-parser-output .hlist dt:last-child::after,.mw-parser-output .hlist li:last-child::after{content:none}.mw-parser-output .hlist dd dd:first-child::before,.mw-parser-output .hlist dd dt:first-child::before,.mw-parser-output .hlist dd li:first-child::before,.mw-parser-output .hlist dt dd:first-child::before,.mw-parser-output .hlist dt dt:first-child::before,.mw-parser-output .hlist dt li:first-child::before,.mw-parser-output .hlist li dd:first-child::before,.mw-parser-output .hlist li dt:first-child::before,.mw-parser-output .hlist li li:first-child::before{content:" (";font-weight:normal}.mw-parser-output .hlist dd dd:last-child::after,.mw-parser-output .hlist dd dt:last-child::after,.mw-parser-output .hlist dd li:last-child::after,.mw-parser-output .hlist dt dd:last-child::after,.mw-parser-output .hlist dt dt:last-child::after,.mw-parser-output .hlist dt li:last-child::after,.mw-parser-output .hlist li dd:last-child::after,.mw-parser-output .hlist li dt:last-child::after,.mw-parser-output .hlist li li:last-child::after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li::before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child::before,.mw-parser-output .hlist dt ol>li:first-child::before,.mw-parser-output .hlist li ol>li:first-child::before{content:" ("counter(listitem)"\a0 "}

/* end https://en.wikipedia.org/ */

</style><style data-mw-deduplicate="TemplateStyles:r1236075235">

/* start https://en.wikipedia.org/ */

.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output .navbox-title,.mw-parser-output .navbox-abovebelow{padding:0.25em 1em;line-height:1.5em;text-align:center}.mw-parser-output .navbox-group{white-space:nowrap;text-align:right}.mw-parser-output .navbox,.mw-parser-output .navbox-subgroup{background-color:#fdfdfd}.mw-parser-output .navbox-list{line-height:1.5em;border-color:#fdfdfd}.mw-parser-output .navbox-list-with-group{text-align:left;border-left-width:2px;border-left-style:solid}.mw-parser-output tr+tr>.navbox-abovebelow,.mw-parser-output tr+tr>.navbox-group,.mw-parser-output tr+tr>.navbox-image,.mw-parser-output tr+tr>.navbox-list{border-top:2px solid #fdfdfd}.mw-parser-output .navbox-title{background-color:#ccf}.mw-parser-output .navbox-abovebelow,.mw-parser-output .navbox-group,.mw-parser-output .navbox-subgroup .navbox-title{background-color:#ddf}.mw-parser-output .navbox-subgroup .navbox-group,.mw-parser-output .navbox-subgroup .navbox-abovebelow{background-color:#e6e6ff}.mw-parser-output .navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}

/* end https://en.wikipedia.org/ */

</style></div><div role="navigation" class="navbox" aria-labelledby="Videotex163" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3"><style data-mw-deduplicate="TemplateStyles:r1239400231">

/* start https://en.wikipedia.org/ */

.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}

/* end https://en.wikipedia.org/ */

</style><div id="Videotex163" style="font-size:114%;margin:0 4em"><a href="Videotex" title="Videotex">Videotex</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Services</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Telidon" title="Telidon">Telidon</a> (1978)</li>

<li><a href="Prestel" title="Prestel">Prestel</a> (1979)</li>

<li><a href="Videotex#Netherlands" title="Videotex">Viditel</a> (1980)</li>

<li><a href="Minitel" title="Minitel">Minitel</a> (1982)</li>

<li><a href="Viewtron" title="Viewtron">Viewtron</a> (1983)</li>

<li><a href="Bildschirmtext" title="Bildschirmtext">Bildschirmtext</a> (1983)</li>

<li><a href="Boston_CitiNet" title="Boston CitiNet">Boston CitiNet</a> (1983)</li>

<li><a href="Captain_(videotex)" title="Captain (videotex)">Captain</a> (1983)</li>

<li><a href="Genesis_Storytime" title="Genesis Storytime">Genesis Storytime</a> (1983)</li>

<li><a href="Beltel" title="Beltel">Beltel</a> (1985)</li>

<li><a href="Microtex_666" title="Microtex 666">Microtex 666</a> (1986)</li>

<li><a href="Bistel" title="Bistel">Bistel</a> (1986)</li>

<li><a href="Videotex#Ireland" title="Videotex">Irish Minitel</a> (1988)</li>

<li><a href="Singapore_Teleview" title="Singapore Teleview">Singapore Teleview</a> (1991)</li></ul>

</div></td><td class="noviewer navbox-image" rowspan="3" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Terminals</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="BBC_Micro_expansion_unit#Prestel_adapter" title="BBC Micro expansion unit">BBC Micro</a> (1981)</li>

<li><a href="MUPID" title="MUPID">MUPID</a> (1981)</li>

<li><a href="AT%26T_Sceptre" title="AT&T Sceptre">AT&T Sceptre</a> (1983)</li>

<li><a href="Alex_(videotex_service)" title="Alex (videotex service)">Alextel</a> (1988)</li>

<li><a href="Singapore_Teleview#Terminal" title="Singapore Teleview">Singapore Teleview Terminal</a> (1991)</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Standards</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="NAPLPS" title="NAPLPS">NAPLPS</a></li>

<li><a href="Videotex_character_set" title="Videotex character set">Videotex character set</a></li>

<li><a href="Antiope_(teletext)" title="Antiope (teletext)">Antiope</a></li></ul>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="3"><div><span class="noviewer" typeof="mw:File"><span title="Commons page"></span></span> <a href="https://commons.wikimedia.org/wiki/Category:Videotex" class="extiw external" title="commons:Category:Videotex"><b>Commons category</b></a></div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-07-14" href="https://en.wikipedia.org/wiki/?title=Viewdata&oldid=1300539373">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

</div>

</div></div>

</div>

</main>

</div>

</body></html>