TWO TELETYPE MODEL 37s LINK FOR RELAY CHAT AT 150 BAUD 

holy shit

That's so cool!

The beauty of the M37 was its unique aggregate motion mechanism, not seen here.

+Emailic Courrierl Fax can't ring a bell. So, e.g., when Nasser died in 1970 and the news came across the UPI machine (made by Teletype) the bell rang five times to indicate to the news readers in radio stations that something very important had just happened.

Richard Haas cl

This is what a newsroom was like.

You haven’t heard a “real” fax with the spiral stainless blade rubbing against the wet chemical paper?

Even printed in red text too!

Whats also ironic is that as pilot, I use my smart phone or tablet to get vital aeronautical information that is still encoded in an ITA2 format. This thing-judging by the lower case letters and extra symbols-is at least ASCII which is 40 years newer.

Yes, these ran at 150 baud - 15 char/sec, 50% faster than Model 33 and 35. And they had a 96-character typebox, so they could do upper/lower case.

Yeah, amazing speed compared to my KSR35!

+Joe Chmelik I used to fix these too. Keesler AFB for 8 weeks. There were four clutches in the front plate. The type box was 16 by 6 characters so you would need four clutches to reach all 16 characters horizontal (2 to the 4th). The three clutches on the side (8 rows) were to reach two rows of upper case, two rows of lower case and two rows of figures and special characters. 2 to the 3rd would be 8 rows but two rows of those ascii characters were non-printing. The selector clutch had two stops so that the machine could print two characters per revolution of the mainshaft. Models 28 and 35 only printed one character per revolution. What it did mechanically could have been done more reliably electronically even in the mid '70s when I was trained on it. Still, the workmanship and the documentation were superb. But it was obsolete when it got to the field.

Well, I just considered it a mechanical monster! Even the Model 28's I show to guest that tour the USS Midway Museum, are stunned by the complexity of the printer.. I would tell them it was nothing compared to the Model 37! Tks for the reply!

+Joe Chmelik So You probably can explain, what is placed in the "Relay room"? Is it just a automatic telephone relay station or it is something specific to teletype?

+mmx358 not sure what your refering to in "Relay". The only relay room I knew was in London UK.

+mmx358 Relays are in the relay room which would be a Faraday box. Relays are electrically noisy so they have to be in a room with metal walls. The Teletype's "raw" input and output is current--a current loop. If its data is coming from an RF receiver then the output of that receiver CW--Continuous Wave is an input to "keyer" which keys a relay that opens and closes the current loop. The start bit is a space--no current--the selector magnet trips the selector clutch which causes the selector clutch cam followers to parallelize the character to the typebox positioning hardware. It's been awhile. In cases where the data source (the keyer) is close to the data sink (the teleprinter) the loop from sink to source will not require relays. The stock tickers in NYC were current loop from the exchanges to all customers south of Chambers Street. It is a small area.

Gidz Paul Becauseeeee you are a nerd like me ..! This is amazing ..! Isn't it ..?

+Daniel Collins Don't forget that when UNIX was written, Teletypes were still used as a method of I/O! You can still do it today with Linux, as long as you have an ASCII capable Teletype lying around.

+museumofcomm When Unix was written both Bell Labs and the Teletype Corporation were part of AT&T so a Teletype terminal would have been the default for the programmers at Bell Labs. Further, when Unix was written Teletype was the traditional terminal. They were truly ubiquitous, including both sides of the Iron Curtain, and any large network for the simple reason that Teletype had repair people all over the place. It was a big company In the early seventies I actually worked on a system that was architected with the Teletype and the CRTs reversed--that is they used a mechanical Teletype as a console and CRTs as I/O devices. The significance of this is that when the system crashed the Teletype had to be operational to bring it back up. There was no such thing as a headless boot at that time.

+Daniel Collins This teletype, i believe, is the traditional terminal

Yup. This is the very reason it's called *printf()* and why it defaults to */dev/tty*

I think I did that on my C-64. Open channel to printer instead of screen. :)

My grandpa lives in Poland too and he had test-graphical teletype and PC (286 with Windows 1.0 then 2.0) in 1986. Yes, he had 68k computer too. And 9.6k landline and packet radio and he used 286 mainly for professional purposes (radios).

How's that fiber?

You can. Just get a terminal unit that has a loop interface and tie it to a mechanical teletype e.g. HAL ST-6000. In my area in the 1970's a group of locals did all sorts of artwork over 6M RTTY. I still send ASCII art over 2M packet, but I don't use mechanical teletype, it's strictly screen.

James Bos Run cat /dev/urandom. More action.

Both files don't exist on SVR3

yes

Color could be selected from the remote end by transmittting control characters. I believe the characters used were SO (0x0E) and SI (0x0F), but I don't have a manual in front of me, so I could well be mistaken.

I think it was a one-off event and the teletypes were an exception but I do agree

I'm pretty sure they do, the ASR-33 was pretty popular I believe.

Every time I see a video about an old machine like this, whether it be a teletype machine, a typewriter, a Linotype machine, an orchestrion, or anything like that, I think the same thing. My house is by no means a small house, but it's certainly not big enough to amass a collection of things like this. Not to mention the difficulty of finding such things and being able to afford them.

@@user-74652 Typewriters are fairly easy to find, but teletype machines seem to be just about impossible. Well, unless you're willing to pay hundreds of dollars on eBay and a fortune to ship it. I did just get really lucky though. Today, I bought a "telegraph perforator" made by a company called Kleinschmidt. I haven't been able to find out much about it, but it seems to be kind of like an early teletype. You type on a keyboard and it punches the characters on tape in Morse code. It's in pretty rough condition and needs a lot of work, but I think I'll be able to restore it.

The Model 37 was different from the 35 but not so different that it was not obsolete when it came out. The Model 35 is basically a 28 with the characters in different places in the typebox and an extra surface on the selector clutch that only affects the stunt/function box. The M37 had 13 clutches vs. the 6 in a Model 28 or 35. Seven of the clutches were to position the typebox. Four clutches in the front plate positioned the type box left and right: The typebox was 16 characters across so that is 2 to the fourth power---four clutches. On the right there were three clutches that moved the type box up and down. The type box had 96 positions but an ASCII set has 128 characters and functions. The typebox has only six rows because the functions are non printing. So assume eight rows two to the third power with two rows not used (control characters bits 6 and 7 are spacing). The positioning clutches had two possible stop positions to correspond with a mark or a space. Also the selector clutch had two stops and would print two characters per revolution. The clutch had a least 9 cam followers so that if the printer ran 24 seven as ours did the clutch and the mainshaft would wear much faster than that of a 28 or 37. They keyboard was of course mechanical and designed like other Teletype keyboards so that you could only depress one key at a time. If it was not stepped by crypto or whatever to a lower baud rate it was the smoothest keyboard that I could ever experienced. In that one part it was a step up.

I forgot another important difference. Models 28 and 35 used clutch shoes 150043 and 150044 while the Model 37 used (from memory) 330006 and 330007. The pairs seemed to work interchangeably, however.

For reference, this isn't a 34. It's a 37. This particular model was the top-of-the-line ASCII machine at the time, but it came out just as CRTs were beginning to become popular as terminals, so it didn't sell as well as the old baudot machines did. :)

I guess I was not quite awake when I entered model 34. I did mean to type model 37.

Think about that for a minute. You're talking words per minute vs tens of PAGES per minute. There's a good reason places that print a lot of text only started printing a lot of text once faster devices like laser printers came out.

The Airlines still use text only printers. And what you see on the PC running Windows is a non-windows application in a Window---a terminal emulator. The reservation applications were originally written in the early '50's. Within the terminal emulator window you must use arrow keys to position the cursor.

Good Ear :-) Yes it was Morse.

Yes but you'd need an ATA adaptor with Pulse to Tone conversion, i dont think VoIP itself supports dial pulsing, only DTMF (Touchtone)

I believe it’s 110 baud.

@@ConnectionsMuseum I believe it was 150. In use on a network the network would determine the speed. The operators that called me to fix these would complain that they were too slow. I had to explain that the stepping came from the computer. If the computer technician would up the baud rate from the computer then I could up the baud rate of the Model 37. There were jumpers in the "logic basket" under the printer. The units we had had two printing units and they printed at different baud rates.

@@richardhaas39 MAX 150, rare although U.C. Berkley could do it regularly. Some of the Marine HF stations has a upper 90's limit (and no error correction of course) that was weird. Normally 110 or below (wire and origin station dependant) - Manual said 110 I seem to recall. Line tuning UGH. Best and worst of times.

Tom Jacobs printing out all that nigerian spam. Good idea how to waste your ink and paper!

Lady Eklipse You can filter out spam e-mail and make it print only legitimate messages.

@@eklipsegirl But now you can actually burn it.

it also could be dieselpunk :)

Not a computer, but a teletype. You can however connect it to the computer and use as a terminal, but it is still a teletype with no processing power. Its like calling mouse a computer.... Or even worse as modern computer mice may have complicated ICs inside like microcontrollers or so... This teletype has no such things...

@@macieksoft Teletype machines can also save messages onto punched tape, right? And then that punched tape can be reloaded into a teletype machine and reprinted? So in a way, it's kind of working like a computer since it can store and retrieve data, even if it's only text. It converts bits from the tape back into printed text.

ct92404 Not really. Teletypes cannot be programmed. They also can't co any maths or logical operations. That way you could say that walkman is computer because it stores sound onto tape and then can replay it....

@@macieksoft like a player piano, which was inspiration for punch tape. So if you think Player Pianos (which predated bletchy park but not babbage ) were computers then let the good times roll. I agree with Macieksoft here ​ @ct6502

no, it's running sh (shell). bash was developed later.

Actually it's ksh.

If the black was on the bottom and red on top, you couldn't see what you were typing, because the ribbon would obscure it. Also, once the type box moves up into typing position, it stays there as long as typing is continuous. It only moves down to its rest position if there is a break in typing, so the lag ends up not being long enough to notice.

Sarah Autumn You can't backspace anyways...

The one that I used in the Navy, we could backspace if we were cutting paper tape with it.

Joseph Wonderless It may have been stored in memory until you pressed return on the last line, or pressed a special key.

Joseph Wonderless When you were cutting a tape, you could always backspace over a mistake, and then type a LTRS character over it. LTRS had the advantage of being "all holes punched", and was not a printing character, so the read mechanism would just advance past it on to the next character.

Yeah... a slow-ass, unencrypted bit stream sending standard characters so slowly that a human could read them in transit. *super* secure.