From msuinfo!gmi!zombie.ncsc.mil!MathWorks.Com!news.duke.edu!news-feed-1.peachnet.edu!gatech!howland.reston.ans.net!EU.net!uknet!hrc63!gec-mrc.co.uk!rnh Sun Oct 9 21:50:26 1994 Path: msuinfo!gmi!zombie.ncsc.mil!MathWorks.Com!news.duke.edu!news-feed-1.peachnet.edu!gatech!howland.reston.ans.net!EU.net!uknet!hrc63!gec-mrc.co.uk!rnh From: rnh@gec-mrc.co.uk (Richard Herring) Newsgroups: sci.crypt Subject: Re: Baudot code Message-ID: <5484@gec-mrc.co.uk> Date: 7 Oct 94 15:10:27 GMT References: Sender: news@gec-mrc.co.uk Lines: 55 Nntp-Posting-Host: gec-mrc.co.uk X-Newsreader: TIN [version 1.2 PL2] Stephen P. Morgan (smorgan@netcom.com) wrote: : Where might I find a _complete_ Baudot code standard? (Is there ex- : actly one?) So far I've seen the codes for the letters of the Latin : alphabet (upper case, of course) plus (I believe) five special char- : acters, e.g. null, end of line, shift in, shift out, and end of : paragraph(?). (Shift in indicates that a different code set, which I have dug out an old EBCDIC/ASCII/etc. code reference card on which many years ago I wrote in by hand one version of the code: Numeric "Letters" "Figures" (unshifted) (shifted) 0 1 T 5 2 3 O 9 4 5 H 6 N , 7 M . 8 9 L ) 10 R 4 11 G @ 12 I 8 13 P 0 14 C . 15 V = 16 E 3 17 Z + 18 D 19 B ? 20 S ! 21 Y 6 22 F % 23 X / 24 A - 25 W 2 26 J 27 28 U 7 29 Q 1 30 K ( 31 (who are you) triggered an answerback sequence from the remote machine. Since '.' appears twice, there is probably an error in this. One of them is probably a quote mark? The presence of the UK pound sign suggests that there were national variants - whether the US version had $ here is anyone's guess. I _think_ this is the variety spoken by Creed Model 7 teleprinters. -- | Richard Herring | rnh@gec-mrc.co.uk | Speaking for myself | GEC-Marconi Research Centre | No, but I used to contribute to the News Quiz. From msuinfo!gmi!zombie.ncsc.mil!MathWorks.Com!news2.near.net!yale!yale!news-mail-gateway!daemon Sun Oct 9 21:52:04 1994 Path: msuinfo!gmi!zombie.ncsc.mil!MathWorks.Com!news2.near.net!yale!yale!news-mail-gateway!daemon From: Grant@dockmaster.ncsc.mil (Lynn R Grant) Newsgroups: sci.crypt Subject: Re: Baudot Code Date: 5 Oct 1994 21:10:32 -0400 Organization: Yale CS Mail/News Gateway Lines: 107 Sender: daemon@cs.yale.edu Message-ID: <941006010946.296371@DOCKMASTER.NCSC.MIL> NNTP-Posting-Host: babyblue.cs.yale.edu Thus spake Stephen P. Morgan (smorgan@netcom.com): >Where might I find a _complete_ Baudot code standard? (Is there >exactly one?) Here is the International Telegraph Alphabet No. 2, as published in the International Telecommunication Union's "Manual for use by maritime mobile and maritime mobile-satellite service," 1976 edition. The numbers in parentheses are footnotes. I have converted their awkward binary notation, which used Z for one and A for zero, into hexadecimal (and triple-checked it, so I don't think I put any errors in). The hex is the 5-bit value that makes up the character itself--when actually transmitted, it is preceded by a zero start bit and a one stop bit. (Thus, F, hex 16, would be transmitted as 0101101.) The stop bit is 1.42 times as long as the other bits, making it a 7.42 bit code. The codes were apparently assigned in order reduce wear on paper tape punches--thus a frequent letter like E has only one punch (hex 10), while a rare letter like V has four punches. This gives it a very strange collating sequence. Combo Letter Figure Hex Number Case Case Value ----------------------------------------- 1 A - 18 2 B ? 13 3 C : 0E 4 D (4) 12 5 E 3 10 6 F (1) 16 7 G (1) 0B 8 H (1) 05 9 I 8 0C 10 J audible 1A signal 11 K ( 1E 12 L ) 09 13 M . 07 14 N , 06 15 O 9 03 16 P 0 0D 17 Q 1 1D 18 R 4 0A 19 S ' 14 20 T 5 01 21 U 7 1C 22 V = 0F 23 W 2 19 24 X / 17 25 Y 6 15 26 Z + 11 27 Carriage return (2) 02 28 Line feed (2) 08 29 Letters (3) (5) 1F 30 Figures (5) 1B 31 Space 04 32 Not used 00 Footnotes: (1) Available for the internal service of each Administration or recognized private operating agency. (2) For page printers. (3) Also used as "erasure" in case of automatic working. (4) a) To operate the answerback unit of the corresponding instrument in the international telex and gentex services. b) Available for the internal service of Administrations. (5) Combination Nos. 29 (letters) and 30 (figures) shall not affect the spacing movement. My Signal-Corps-surplus Model 15 Teletype uses a different arrangement for some of the figures: 4 D $ 12 6 F ! 16 7 G & 0B 8 H STOP 05 10 J ' 1A 19 S BELL 14 22 V ; 0F 26 Z " 11 32 blank keytop 00 FIGS H was the motor stop function. When you sent a FIGS H, the motors on the TTYs at both ends shut down. You restarted them by pressing the BREAK lever, which interrupted the connection momentarily. I believe interoperation between TTYs that used FIGS J for BELL and TTYs that used FIGS S for BELL was common. I remember copying commercial TTY traffic to ships in the early 1970s. When they wanted to get the attention of the receiving operator, they would send a string of alternating primes and BELLs, so the bell would ring regardless of the type of machine. ------------------------------------------------------------------------ Lynn Grant N8AF | 1303151404 190612040B 0C0A091402 08 Grant@ | 1405031C09 12041E0C14 1404180512 041E0C1414 0208 DOCKMASTER.NCSC.MIL | 131C010413 0315140418 0612040B0C 0A09140208 | 1405031C09 12060104 1203040105 0C140208 | 1B1F1B1F1B 1F1A1A1A1A 1A1A | 1B1F1B1F1B 1F1A1A1A1A 1A1A | 1B1F1B1F1B 1F1A1A1A1A 1A1A | 1805050505 050208 ------------------------------------------------------------------------