Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!uwm.edu!rutgers!bellcore!texbell!vector!telecom-gateway From: morris@jade.jpl.nasa.gov (Mike Morris) Newsgroups: comp.dcom.telecom Subject: Re: The 'Public Telegraph Office' Message-ID:Date: 25 Sep 89 08:58:58 GMT Sender: news@vector.Dallas.TX.US Reply-To: Mike Morris Lines: 119 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 411, message 1 of 8 johnl@esegue.segue.boston.ma.us (John R. Levine) writes: >In article you write: >>typing. A small bell, driven by a just like today ... >Smallest nit of the week -- telex machines are all Baudot five-bit code, >for which there's no such thing as a control key, just letter-shift and >number-shift. The bell is some number-shift key. >[Moderator's Note: Well I believe it was the 'shift - 7' now that you mention >it; and of course control-G is Ascii 7. Weren't the 'number-shift' keys >essentially like control keys? How did they get line feed, carriage return, >ENQ (who are you?) and answerback without control codes? My handy Ascii >chart here says control-E, or ASC(5) when sent polls the other end to This isn't ascii! 7-bit ascii has 128 combinations, we have 5 bits with 32 combinations. Like they say in Oregon: "Things are different here!" >identify itself. What do you think? PT] Here's the map of the baudot / 3-row / pick your name.. 1 2 3 4 5 6 7 8 9 0 The upper case is the same in all character sets Q W E R T Y U I O P for this row of the keyboard. - $ ! & ' ( ) A S D F G H J K L " / : ; ? , . FIGS Z X C V B N M LTRS LF (blank) (space bar) There is actually four different US character sets, plus the international set. There is the "Military", the "Weather", the "TWX" and the "Telex" set. LTRS Int'l Mil TWX TELEX WX A - - - - up arrow S ' Bell Bell ' Bell D currency $ $ WRU upper right arrow F DV* ! 1/4 $ right arrow G DV* & & & lower right arrow H DV* STOP DV* # down arrow J Bell ' , Bell lower left arrow K ( ( 1/2 ( left arrow L ) ) 3/4 ) upper left arrow Z + " " " + X / / / / / C : : WRU : circle V = ; 3/8 ; circle with a vertical bar inside B ? ? 5/8 ? circle with a + inside N , , DV* , circle (my chart dupes shift-C) M . . . . . DV* means "Domestic Variation" My first machine was purchased from Southern Pacific, and had the "TWX" character set - commonly knowin in ham circles as the "stock market" set. Fortunately the Model 15 and 19 printers had a type basket with soldered-on type pallets, and I was able to purchase replacement pallets (for 30 cents apiece!) and solder them on. Changing the shift-J bell to a "S-Bell" required disassembling the machine and replaciing the decoding arm. Interestingly, breaking off a tab allowed printing a bell character (like the " were translated into strings like fortrans ".LT." and ".GT." - he had implemented .NE. for <>, etc. I was amazed that it could be done, and flabbergasted that he did it in a 8k system (note that 8k was the total RAM - which held the system, the I/O lookup and the BASIC interpreter!). I wish I had saved a copy of the I/O driver listing. Mike Morris UUCP: Morris@Jade.JPL.NASA.gov ICBM: 34.12 N, 118.02 W #Include quote.cute.standard PSTN: 818-447-7052 #Include disclaimer.standard cat flames.all > /dev/null