473:
956:
465:
27:
109:
271:
1045:
716:
526:
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. As of 2019 (Unicode 12.1), these changes have not been accepted/implemented.
166:
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
253:-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
720:
1079:
824:
331:
It was made in the late 1970s and early 1980s to make it easier for travel consultants to check availability and make bookings for holidays. A number of
Viewdata
1074:
541:
589:"E.161 : Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network"
500:(#), which do not necessarily conform to the ITU specifications for the keypad symbols; the asterisk is also usually displayed smaller and raised.
162:, who had the idea for Viewdata in 1968, was credited as inventor of the system which was developed while working for the British
665:
783:
725:
627:
592:
489:
1069:
698:
831:
777:
318:
300:
970:
780:(running on the original software and hardware from the time of its original incarnation, accessed via java client)
731:
1022:
296:
49:, England. Note the "_ to continue" rather than the correct "# to continue", showing a common rendering error.
32:
183:(IRV IA5) – 7 bits with no accented characters. Originally Viewdata was accessed with a special purpose
762:
1048:
292:
281:
516:
1084:
994:
932:
508:
285:
1000:
1027:
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332:
147:
128:
621:"Proposal to incorporate two telephony symbols into Unicode by glyph and annotation changes"
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8:
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62:
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683:
523:
97:
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Viewdata uses special symbols already widely available on telephone keypads: the
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38:
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687:
344:
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136:
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existed in the 1980s, predominantly in the UK due to the proliferation of the
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speed (1,200 bit/s down, 75 bit/s up). By 2004 it was normally accessed over
159:
108:
58:
42:
246:. Once they find what the customer is looking for they can place a booking.
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920:
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347:
vogue. Some
Viewdata boards still exist, with accessibility in the form of
235:
497:
450:
803:
468:
Detail of a telephone keypad displaying the sextile and
Viewdata square
348:
199:
132:
806:
An ncurses/terminal client for TeeFax, Telstar, CCl4, NXTel and others
656:
492:. These are often treated as approximately corresponding to the ASCII
26:
797:
652:
336:
270:
884:
840:
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430:
188:
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140:
124:
113:
72:
878:
866:
860:
536:
378:
180:
46:
1017:
926:
914:
669:
503:
These symbols appear as 'Sextile' and 'Viewdata square' in the
351:
203:
791:
766:
31:
Viewdata
Graphics used in the experimental phone directory of
976:
476:
Detail of a telephone keypad substituting an enlarged * and #
357:
196:
192:
155:
772:
809:
511:
Unicode blocks, respectively. The sextile was added due to
249:
There are a number of factors still holding up a move to a
151:
37:
The image is a graphical representation of the Post Office/
751:
Definition at The
Institute for Telecommunication Sciences
179:
Viewdata offered a display of 40×24 characters, based on
800:
A Viewtex web client for TeeFax, Telstar, CCl4 and NXTel
769:
and client implementation, and a public hosted service).
758:
519:
character set, as a replacement for the underscore.
1080:
History of telecommunications in the United
Kingdom
658:Alphanumerics for viewdata and broadcast teletext
1061:
515:, and the square had previously appeared in the
238:use it to look up the price and availability of
16:Information retrieval service and legacy system
682:
522:In 2013, the German national body submitted a
488:"square" key, as formally standardised by the
825:
618:
226:As of 2015, Viewdata was still in use in the
299:. Unsourced material may be challenged and
1075:History of computing in the United Kingdom
832:
818:
614:
612:
610:
358:Keypad symbols: the sextile and the square
343:appeared in the late 1990s fuelled by the
651:
645:
319:Learn how and when to remove this message
260:
471:
463:
107:
607:
565:"Proceedings of the Videotex in Europe"
257:cannot agree on a Web-based standard.
1062:
755:Examples of existing Viewdata boards:
813:
593:International Telecommunication Union
559:
557:
490:International Telecommunication Union
1044:
297:adding citations to reliable sources
264:
794:Including several Prestel Brochures
792:Celebrating the Viewdata Revolution
13:
786:(running emulated through the web)
554:
221:
14:
1101:
744:
619:Karl Pentzlin (28 October 2013).
218:, or using a Web-based emulator.
158:display over a separate channel.
127:implementation. It is a type of
1043:
954:
719: This article incorporates
714:
704:from the original on 2022-10-09.
269:
154:and receive requested data on a
112:A Viewdata machine displayed in
25:
732:General Services Administration
633:from the original on 2022-10-09
676:
581:
33:Post Office Telecommunications
1:
547:
174:
839:
7:
1070:Computer network technology
1001:Singapore Teleview Terminal
530:
524:Unicode Technical Committee
84:; 50 years ago
10:
1106:
1041:
1010:
963:
952:
847:
688:"Miscellaneous Technical"
416:
411:
376:
369:
364:
96:
78:
68:
54:
24:
773:Telstar Videotex Service
509:Miscellaneous Technical
436:*, *
371:Viewdata keypad symbols
41:Research laboratories (
1028:Videotex character set
727:Federal Standard 1037C
721:public domain material
477:
469:
333:bulletin board systems
261:Bulletin board systems
117:
505:Miscellaneous Symbols
475:
467:
129:information retrieval
111:
695:The Unicode Standard
513:its use in astrology
339:, and a short-lived
293:improve this section
484:"star" key and the
131:service in which a
21:
945:Singapore Teleview
684:Unicode Consortium
626:. UTC L2/13-105R.
478:
470:
189:emulation software
118:
19:
1057:
1056:
909:Genesis Storytime
784:The Dwarfen Realm
595:. 2 February 2001
462:
461:
329:
328:
321:
216:Microsoft Windows
212:personal computer
106:
105:
1097:
1050:Commons category
1047:
1046:
989:AT&T Sceptre
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834:
827:
820:
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734:. Archived from
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542:Telstar Viewdata
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341:Viewdata Revival
324:
317:
313:
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304:
273:
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240:package holidays
230:, mainly by the
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90:
85:
29:
22:
18:
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406:VIEWDATA SQUARE
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308:
305:
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232:travel industry
224:
222:Travel industry
208:client software
206:using Viewdata
177:
88:
86:
83:
50:
39:British Telecom
36:
17:
12:
11:
5:
1103:
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1085:Legacy systems
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897:Boston CitiNet
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891:Bildschirmtext
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746:
745:External links
743:
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741:
738:on 2022-01-22.
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675:
655:(1981-06-01).
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417:Different from
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412:Different from
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359:
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345:retrocomputing
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255:tour operators
228:United Kingdom
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145:common carrier
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939:Irish Minitel
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278:This section
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236:Travel agents
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160:Samuel Fedida
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59:Samuel Fedida
57:
53:
48:
44:
43:Adastral Park
40:
34:
28:
23:
1049:
921:Microtex 666
854:
767:page manager
736:the original
726:
694:
678:
657:
647:
635:. Retrieved
597:. Retrieved
583:
572:. Retrieved
570:. 1979-07-19
521:
502:
479:
340:
330:
315:
306:
291:Please help
279:
248:
225:
178:
120:
119:
637:23 December
599:23 December
517:BS_Viewdata
498:number sign
451:NUMBER SIGN
195:running at
164:Post Office
98:Platform(s)
79:Launch date
63:Post Office
1064:Categories
574:2023-12-26
548:References
175:Technology
150:, request
133:subscriber
1011:Standards
971:BBC Micro
964:Terminals
778:Ringworld
456:#
354:clients.
337:BBC Micro
309:June 2023
280:does not
139:a remote
55:Developer
35:in 1977.
1090:Videotex
885:Viewtron
855:Viewdata
848:Services
841:Videotex
765:server,
699:Archived
664:. ITSCJ/
628:Archived
531:See also
496:(*) and
494:asterisk
431:ASTERISK
403:⌗
390:⚹
377:In
214:running
191:) and a
185:terminal
169:teletext
141:database
125:Videotex
121:Viewdata
114:teletext
102:Viewdata
73:Videotex
20:Viewdata
1033:Antiope
995:Alextel
903:Captain
879:Minitel
873:Viditel
867:Prestel
861:Telidon
798:vd-view
537:Prestel
393:SEXTILE
379:Unicode
301:removed
286:sources
244:flights
181:ISO 646
148:channel
87: (
47:Suffolk
1018:NAPLPS
1003:(1991)
997:(1988)
991:(1983)
985:(1982)
979:(1981)
973:(1981)
947:(1991)
941:(1988)
935:(1988)
929:(1986)
927:Bistel
923:(1986)
917:(1985)
915:Beltel
911:(1983)
905:(1983)
899:(1983)
893:(1983)
887:(1983)
881:(1982)
875:(1980)
869:(1979)
863:(1978)
857:(1975)
804:vidtex
670:ISO-IR
447:#
444:
442:U+0023
427:*
424:
422:U+002A
400:
398:U+2317
387:
385:U+26B9
352:Telnet
204:TCP/IP
143:via a
137:access
116:format
977:MUPID
759:NXtel
723:from
702:(PDF)
691:(PDF)
662:(PDF)
631:(PDF)
624:(PDF)
568:(PDF)
210:on a
197:ITU-T
193:modem
156:video
123:is a
45:) in
1023:CEPT
983:NABU
933:Alex
763:free
672:-47.
666:IPSJ
639:2019
601:2019
507:and
349:Java
284:any
282:cite
242:and
200:V.23
187:(or
152:data
135:can
89:1974
82:1974
69:Type
761:(a
653:BSI
365:⌗ ⚹
295:by
251:Web
1066::
730:.
697:.
693:.
686:.
668:.
609:^
591:.
556:^
234:.
171:.
61:,
833:e
826:t
819:v
641:.
603:.
577:.
486:⌗
482:⚹
458:)
454:(
438:)
434:(
322:)
316:(
311:)
307:(
303:.
289:.
91:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
