Newsgroups: comp.society.folklore,alt.folklore.computers From: eric@fudge.uchicago.edu (Eric Fischer) Subject: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Sender: news@midway.uchicago.edu (News Administrator) X-Newsposter: Pnews 4.0-test51 (15 Jan 97) Organization: The University of Chicago Date: Thu, 15 Oct 1998 21:41:05 GMT Approved: eric@fudge.uchicago.edu Lines: 48 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news.belnet.be!newsgate.cistron.nl!het.net!news-feed.inet.tele.dk!bofh.vszbr.cz!news.maxwell.syr.edu!newsfeed.cwix.com!192.52.106.6!ncar!uchinews!not-for-mail I've been reading up on the history of printing telegraphs and came across an article, "A New Keyboard Perforator for the Baudot Printing Telegraph System" by A. E. Thompson, in _Electrical Communication_, volume 3, pages 295-300. The article says that "the Baudot system in its usual form is well known to most telegraph engineers," but its table of the Baudot code (which, prior to the invention of the keyboard perforator described in the article, had to be typed in raw binary!) is nothing like any of the Baudot variants I've ever seen before: code letters figures ------- ------- ------- 00001 letters space (do these shift cases *and* produce a space?) 00010 figures space 00011 * * 00100 Y 3 00101 S ; 00110 B 8 00111 R - 01000 E 2 01001 X , 01010 G 7 01011 M ) 01100 I _O_ (that is, an underlined, superscript O) 01101 W ? 01110 F _F_ 01111 N # 10000 A 1 10001 _t_ . (yes, an underlined superscript *lowercase* t) 10010 J 6 10011 K ( 10100 U 4 10101 T ! 10110 C 9 10111 Q / 11000 E' & 11001 Z : 11010 H _H_ 11011 L = 11100 O 5 11101 V ' 11110 D 0 11111 P % Has anyone ever seen this encoding in use anywhere before? Another article, by the same author, thirteen years later, uses what seems to be the standard Baudot encoding, the "international" version. eric ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: Robert Billing Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: Tanglewood References: Date: Fri, 16 Oct 1998 16:29:12 GMT Approved: eric@fudge.uchicago.edu Lines: 12 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!news.maxwell.syr.edu!news-nyc.telia.net!newsfeed.cwix.com!192.52.106.6!ncar!uchinews!not-for-mail Eric Fischer wrote: > 01100 I _O_ (that is, an underlined, superscript O) This may be the dead giveaway. This symbol is used in IIRC Spanish to write N _o_ as an abbreviation for "number". -- I am Robert Billing, Christian, inventor, traveller, cook and animal lover, I live near 0:46W 51:22N. http://www.tnglwood.demon.co.uk/ "Bother," said Pooh, "Eeyore, ready two photon torpedoes and lock phasers on the Heffalump, Piglet, meet me in transporter room three" ###### Newsgroups: alt.folklore.computers,comp.society.folklore From: jvarela@mind.spring.com (John Varela) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Reply-To: jvarela@mind.spring.com Organization: MindSpring Enterprises References: Date: Sat, 17 Oct 1998 00:31:40 GMT Approved: eric@fudge.uchicago.edu Lines: 15 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!news.maxwell.syr.edu!news.cis.ohio-state.edu!math.ohio-state.edu!uwm.edu!uwvax!uchinews!not-for-mail On Fri, 16 Oct 1998 16:29:12, Robert Billing wrote: > > 01100 I _O_ (that is, an underlined, superscript O) > > This may be the dead giveaway. This symbol is used in IIRC Spanish to > write N _o_ as an abbreviation for "number". Spanish uses superscript underlined o to represent masculine ordinal numbers. For example, 2_o_ is segundo. But it also uses superscript underlined a for feminine ordinals, as in 1_a_ for primera. This set has no superscript underlined a and the F, H, and t are a whole 'nother thing. -- John "try again" Varela (delete . between mind and spring to e-mail me) ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: "John Kdllin" Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: Microsoft Corp. References: Date: Sat, 17 Oct 1998 00:32:23 GMT Approved: eric@fudge.uchicago.edu Lines: 18 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!news.maxwell.syr.edu!news.cis.ohio-state.edu!math.ohio-state.edu!uwm.edu!uwvax!uchinews!not-for-mail Robert Billing wrote in message ... >Eric Fischer wrote: > >> 01100 I _O_ (that is, an underlined, superscript O) > >This may be the dead giveaway. This symbol is used in IIRC Spanish to >write N _o_ as an abbreviation for "number". _a_ and _o_ are used in Spanish to designate ordinals: 3_o_ means "tercero", or "third" for a masculine ordinal, and 3_a_ means "tercera", or third for feminine ordinal. Being able to write N_o_ is an added bonus. -- John Kdllin -- johnkal at microsoft dot com My opinions. Mine, MINE, *MINE*! ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: ard@p850ug1.demon.co.uk (Tony Duell) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Followup-To: comp.society.folklore,alt.folklore.computers Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: P850 User Group References: Date: Sat, 17 Oct 1998 16:09:42 GMT Approved: eric@fudge.uchicago.edu Lines: 50 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!news.maxwell.syr.edu!newsfeed.cwix.com!192.52.106.6!ncar!uchinews!not-for-mail Eric Fischer (eric@fudge.uchicago.edu) wrote: [...] : table of the Baudot code (which, prior to the invention of the keyboard : perforator described in the article, had to be typed in raw binary!) is : nothing like any of the Baudot variants I've ever seen before: I have here volume 6 of 'Modern Electrical Engineering'. The date is not given, but I would guess early this century. In Chapter VIII 'The Baudot', it gives essentially the same coding. However, you're giving the bits in a strange order, namely bit 1 first and then on to bit 5. The table I have gives the bits in order 5, 4 ,1, 2, 3. This is not as strange as it sounds, those are the order of the 5 keys on the chording keyboard. Bit finger 5 Middle, left hand 4 Index, left hand 1 Index, right hand 2 Middle, right hand 3 Third, right hand. : code letters figures : ------- ------- ------- : 00001 letters space (do these shift cases *and* produce a space?) : 00010 figures space Yes. Space and change case. The printer printed on a strip of paper, so there was no need for CR or LF, BTW [...] : 01111 N # That's N_o_ (superscript lower case O), not a # in my table [...] : Has anyone ever seen this encoding in use anywhere before? Another See above. I think this is the original Baudot code. Also, the conventional baudot system of the time time-multiplexed 4 sets of 5 bits onto a single line. There was a rotating mechanical commutator for this. -tony ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: Dik.Winter@cwi.nl (Dik T. Winter) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: CWI, Amsterdam References: Date: Sun, 18 Oct 1998 05:02:13 GMT Approved: eric@fudge.uchicago.edu Lines: 23 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news.belnet.be!newsgate.cistron.nl!het.net!newsfeed.wirehub.nl!btnet-peer!btnet!newsfeed.cwix.com!128.174.5.49!vixen.cso.uiuc.edu!uchinews!not-for-mail In article eric@fudge.uchicago.edu (Eric Fischer) writes: > The article says that "the Baudot system in > its usual form is well known to most telegraph engineers," but its > table of the Baudot code (which, prior to the invention of the keyboard > perforator described in the article, had to be typed in raw binary!) is > nothing like any of the Baudot variants I've ever seen before: What you had was indeed the original Baudot code. > Has anyone ever seen this encoding in use anywhere before? Another > article, by the same author, thirteen years later, uses what seems > to be the standard Baudot encoding, the "international" version. And that second article did not contain Baudot code but Murray. The original Baudot code was CCITT #1. The modified (and more widely known and erroneously called Baudot) code was the Murray code aka CCITT #2. In most of these codes the non-alphanumerical symbols were a bit indeterminate. -- dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131 home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~dik/ ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: eric@fudge.uchicago.edu (Eric Fischer) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Sender: news@midway.uchicago.edu (News Administrator) X-Newsposter: Pnews 4.0-test51 (15 Jan 97) Organization: The University of Chicago References: Date: Sun, 18 Oct 1998 23:20:50 GMT Approved: eric@fudge.uchicago.edu Lines: 63 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news.belnet.be!newsfeed.wirehub.nl!btnet-peer!btnet!newsfeed.cwix.com!128.174.5.49!vixen.cso.uiuc.edu!uchinews!not-for-mail D. Peschel wrote: > My real question is: Does anyone know what method Baudot used to > allocate the letters in his code? I once sat down with a table in > order to find the logic in the code, but the whole thing looks very > ad hoc. At the time I came up with the theory that the figures were > assigned first. (There's some correspondence between the code > numbers for the figures and their numerical values, IIRC.) Actually, there is a logic, however weird, to most of the code, though some of the punctuation marks seem to be thrown in wherever they would fit. Remember that in the original Baudot system the telegraph operator was pressing a key to correspond to each bit, not typing on a typewriter-style keyboard, so there had to be some logic to the code to allow people to memorize it. Here is (most of) the code again, this time with the proper bit order and sorted by category: Control characters: o. ... space (letters) .o ... space (figures) oo ... erasure Numbers: .. o.. 1 .o o.. 6 .. .o. 2 .o .o. 7 .. ..o 3 .o ..o 8 .. o.o 4 .o o.o 9 .. ooo 5 .o ooo 0 Vowels: Middle third of the consonants: .. o.. a oo o.. k .. oo. é oo oo. l .. .o. e oo .o. m .. .oo i oo .oo n .. ooo o oo ooo p .. o.o u oo o.o q .. ..o y oo ..o r Other consonants: .o ..o b o. ..o s .o o.o c o. o.o t .o ooo d o. ooo v .o .oo f o. .oo w .o .o. g o. .o. x .o oo. h o. oo. z .o o.. j I don't know what the logic was for the ordering within each group, but the second half of the numbers use the same right-hand pattern as the first half, and the last third of the consonants similarly parallels the first third. I'm not going to try to come up with an explanation for why the middle third and the vowels go in the opposite order from the first and last thirds. Thanks to everyone who's been answering these Baudot questions! I should have done a little more reading before I posted. eric ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: Dik.Winter@cwi.nl (Dik T. Winter) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: CWI, Amsterdam References: Date: Mon, 19 Oct 1998 00:23:57 GMT Approved: eric@fudge.uchicago.edu Lines: 26 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!nntprelay.mathworks.com!newsfeed.cwix.com!128.174.5.49!vixen.cso.uiuc.edu!uchinews!not-for-mail In article dpeschel@u.washington.edu (D. Peschel) writes: > Isn't the formal name "CCITT International Telegraph Alphabet #1" or > something like that? Indeed: International Alphabet #1. No Telegraph in there. > (BTW, I just read about #3 and #5 but not #4! Does anyone have > any info on those?) That is the one I have been missing a long time, never found it. > My real question is: And I have no answer to this. > The code given in the original post (now snipped) had some special characters > in the alphabetic case, which I don't remember seeing in my table. So either > there was some variation in the lower case as well as the upper, or CCITT > made some changes when they adopted Baudot's code as their own. There was variation in the non-alphanumeric symbols. So both cases show variation. I know of quite a few variants of #2. -- dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131 home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~dik/ ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: jsavard@freenet.edmonton.ab.ca () Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Followup-To: comp.society.folklore,alt.folklore.computers Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: Edmonton FreeNet, Edmonton, Alberta, Canada References: Date: Mon, 19 Oct 1998 02:26:49 GMT Approved: eric@fudge.uchicago.edu Lines: 26 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!news.maxwell.syr.edu!howland.erols.net!vixen.cso.uiuc.edu!uchinews!not-for-mail Eric Fischer (eric@fudge.uchicago.edu) wrote: : Has anyone ever seen this encoding in use anywhere before? Another : article, by the same author, thirteen years later, uses what seems : to be the standard Baudot encoding, the "international" version. The standard 5-level Teletype code, although it's often called "Baudot", after Emile Baudot, the inventor of the 5-unit code printing telegraph, doesn't at all resemble the code he actually used - and this code is the one you probably saw in that article. Later, one John Murray, in London, devised a printing telegraph using a code very similar to the standard 5-unit code used today. However, like Baudot's original code, it also used space characters that shifted, and the figures case was mostly different. (It included characters like 1/ , 3/ , 5/ , and 7/ , raised, for making fractions.) You can see a chart of the standard 5-unit code including the original Murray code on which it was based on my web site at http://www.freenet.edmonton.ab.ca/~jsavard/tele03.html So some people refer to today's 5-unit code as the Murray code, and they are closer to being correct than those who call it Baudot. John Savard ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: jsavard@tenMAPSONeerf.edmonton.ab.ca (John Savard) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: Videotron Communications Ltd. References: Date: Wed, 21 Oct 1998 20:13:44 GMT Approved: eric@fudge.uchicago.edu Lines: 27 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!newscore.univie.ac.at!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!newsfeed.cwix.com!128.174.5.49!vixen.cso.uiuc.edu!uchinews!not-for-mail Dik.Winter@cwi.nl (Dik T. Winter) wrote, in part: >In article dpeschel@u.washington.edu (D. Peschel) writes: > > Isn't the formal name "CCITT International Telegraph Alphabet #1" or > > something like that? > >Indeed: International Alphabet #1. No Telegraph in there. > > > (BTW, I just read about #3 and #5 but not #4! Does anyone have > > any info on those?) > >That is the one I have been missing a long time, never found it. I thought I saw 4 in the James Martin book "Telecommunications and the Computer". #3 was a 6 bit version of #2, with a parity bit added, and #4 was the Moore ARQ code, IIRC. There were two completely different 7 bit codes, one a 3 out of 7 code and one a 4 out of 7 code, used to represent 5-level code. The newer one is given in the ARRL Handbook. I think both of them are in the table on my web page too: http://www.freenet.edmonton.ab.ca/~jsavard/tele03.html John Savard http://members.xoom.com/quadibloc/index.html ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: jsavard@tenMAPSONeerf.edmonton.ab.ca (John Savard) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: Videotron Communications Ltd. References: Date: Wed, 21 Oct 1998 20:14:00 GMT Approved: eric@fudge.uchicago.edu Lines: 19 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news.belnet.be!newsgate.cistron.nl!het.net!news-feed.inet.tele.dk!bofh.vszbr.cz!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!howland.erols.net!vixen.cso.uiuc.edu!uchinews!not-for-mail Dik.Winter@cwi.nl (Dik T. Winter) wrote, in part: >In article dpeschel@u.washington.edu (D. Peschel) writes: > > Isn't the formal name "CCITT International Telegraph Alphabet #1" or > > something like that? > >Indeed: International Alphabet #1. No Telegraph in there. > > > (BTW, I just read about #3 and #5 but not #4! Does anyone have > > any info on those?) > >That is the one I have been missing a long time, never found it. I checked my page, and refreshed my memory. #3 was Moore ARQ; #4 was the one with the parity bit. John Savard http://members.xoom.com/quadibloc/index.html ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: Dik.Winter@cwi.nl (Dik T. Winter) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: CWI, Amsterdam References: Date: Thu, 22 Oct 1998 14:15:03 GMT Approved: eric@fudge.uchicago.edu Lines: 35 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!nntprelay.mathworks.com!howland.erols.net!vixen.cso.uiuc.edu!uchinews!not-for-mail In article jsavard@tenMAPSONeerf.edmonton.ab.ca (John Savard) writes: > Dik.Winter@cwi.nl (Dik T. Winter) wrote, in part: ... > > > (BTW, I just read about #3 and #5 but not #4! Does anyone have > > > any info on those?) > >That is the one I have been missing a long time, never found it. > > I thought I saw 4 in the James Martin book "Telecommunications and the > Computer". #3 was a 6 bit version of #2, with a parity bit added, and > #4 was the Moore ARQ code, IIRC. > > There were two completely different 7 bit codes, one a 3 out of 7 code > and one a 4 out of 7 code, used to represent 5-level code. The newer > one is given in the ARRL Handbook. I think both of them are in the > table on my web page too: What I have found as CCITT #3 is a 3 out of 7 code. I also do have the Moore 3 out of 7 code, but that one is completely different. In addition there is the Telex 4 out of 8 code. And I have one additional 4 out of 8 code. > There were two completely different 7 bit codes, one a 3 out of 7 code > and one a 4 out of 7 code, used to represent 5-level code. The newer > one is given in the ARRL Handbook. I think both of them are in the > table on my web page too: > > http://www.freenet.edmonton.ab.ca/~jsavard/tele03.html Indeed. And CCITT #3 (ITA 3) is indeed the code I had. ITA 4 is there too and it apparently is ITA 2 with a leading 0 bit added plus a few symbols where the leading bit is 1 (character 32, beta and SYNC). -- dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131 home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~dik/ ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: jsavard@tenMAPSONeerf.edmonton.ab.ca (John Savard) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: Videotron Communications Ltd. References: Date: Fri, 23 Oct 1998 00:58:10 GMT Approved: eric@fudge.uchicago.edu Lines: 24 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news.belnet.be!news-raspail.gip.net!news-peer.gip.net!news.gsl.net!gip.net!howland.erols.net!vixen.cso.uiuc.edu!uchinews!not-for-mail Dik.Winter@cwi.nl (Dik T. Winter) wrote, in part: >What I have found as CCITT #3 is a 3 out of 7 code. I also do have the >Moore 3 out of 7 code, but that one is completely different. In addition >there is the Telex 4 out of 8 code. And I have one additional 4 out of 8 >code. Interesting. I'll have to visit your site again, and check into that; I know my sources have given ITA 3 and the Moore ARQ as the same. Another 3 out of 7 code is on my site - and I know of the IBM 4 out of 8 code for BCDIC, but that's unrelated. (And there's AUTOSPEC too, which I happened to run across, as yet another variant of 5-level code for bad conditions; this one repeats each character twice, but inverting the repetition depending on the character's parity.) >Indeed. And CCITT #3 (ITA 3) is indeed the code I had. ITA 4 is there >too and it apparently is ITA 2 with a leading 0 bit added plus a few >symbols where the leading bit is 1 (character 32, beta and SYNC). Even when I looked at my site, I didn't recheck it closely enough! John Savard http://members.xoom.com/quadibloc/index.html ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: jsavard@tenMAPSONeerf.edmonton.ab.ca (John Savard) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: Videotron Communications Ltd. References: Date: Fri, 23 Oct 1998 00:58:34 GMT Approved: eric@fudge.uchicago.edu Lines: 26 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!news.maxwell.syr.edu!howland.erols.net!vixen.cso.uiuc.edu!uchinews!not-for-mail Dik.Winter@cwi.nl (Dik T. Winter) wrote, in part: >What I have found as CCITT #3 is a 3 out of 7 code. I also do have the >Moore 3 out of 7 code, but that one is completely different. Not _quite_ completely different. Your tables show these codes in octal; from your table, the codings are: Moore ARQ CCITT #3 Q 130 1011000 015 0001101 W 122 1010010 045 0100101 E 016 0001110 070 0111000 R 023 0010011 144 1100100 T 121 1010001 105 1000101 Y 124 1010100 025 0010101 It's just that the source you used for Moore ARQ presented it in the opposite bit order from that used by your source for CCITT #3. Because ASCII is transmitted least-significant-bit first, it isn't clear whether 5-level code and its relatives should be shown with the bits in 54321 order or 12345 order. John Savard http://members.xoom.com/quadibloc/index.html ###### Newsgroups: comp.society.folklore,alt.folklore.computers From: Dik.Winter@cwi.nl (Dik T. Winter) Subject: Re: Anyone recognize this Baudot encoding? X-Nntp-Posting-Host: fudge.uchicago.edu Message-ID: Originator: eric@fudge.uchicago.edu (Eric Fischer) Sender: news@midway.uchicago.edu (News Administrator) Organization: CWI, Amsterdam References: Date: Fri, 23 Oct 1998 14:10:16 GMT Approved: eric@fudge.uchicago.edu Lines: 15 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!newscore.univie.ac.at!btnet-peer!btnet!newsfeed.cwix.com!128.174.5.49!vixen.cso.uiuc.edu!uchinews!not-for-mail In article jsavard@tenMAPSONeerf.edmonton.ab.ca (John Savard) writes: > Not _quite_ completely different. Your tables show these codes in > octal; from your table, the codings are: ... > It's just that the source you used for Moore ARQ presented it in the > opposite bit order from that used by your source for CCITT #3. Indeed, except for a Z <-> U reversal, but I think that is an error in my Moore table. I will have to check (first check where I found it in the first place back in about 1985). I thought I had checked for bit reversal, apparently I had not. -- dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131 home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~dik/