Teletype ASR-33 Restoration
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- čas přidán 4. 06. 2024
- Malcolm Clark talks us through his "lockdown project" - the restoration of a Teletype ASR-33. Starting with three rusty and incomplete units from the museum store, his challenge was to bring back to life one working example.
We also take a look at the museum's display ASR-33, and see how these devices were used in the days before keyboards and monitors were used to interact with computers.
00:00 Intro and Teletype with Elliott 903
02:22 Restoration starting point
04:07 Restoration detail
18:49 Machine running and data path
23:44 Machine fully assembled
25:32 Adjustments
27:23 Machine running
Video production for TNMOC: Dave Wild. - Věda a technologie
I''ve spent many hours in front of one of these. You can take well earned pride in the job that you've done restoring this piece of equipment. Well done, sir.
Great video, many thanks. I had a KSR-33, with a serial I/F, attached to my Model 1 TRS-80, back in the late 70's, early 80's!!
Sounds like you had a great computing set up!
Those teletypes were designed by a mechanical genius, well done for getting this one going again after so many years.
Amazing video! I have an 8bit asr33 and two 5bit versions I've been restoring over many years, GREAT JOB!
Great to hear!
Fantastic piece of work Malcolm. I love the use of "Hello World" on the first print!
I used one of those in the comm center of a law firm in the late 70s. Great summer job. Loud. Very solid machine. Edit: outstanding restoration, by the way! I remember having to add an 'erase' or 'null' (all holes punched) after each carriage return to give time for the print head to make it to the home position. In fact, it might have been 3 nulls - was so long ago.
The characters were printed at 10 characters per second or 100 milliseconds apart. Carriage Return took 200 milliseconds for an 80 character line, Line Feed took 100 milliseconds.
If you sent CR then LF followed by text then there was no problem with continuous printing.
If you sent LF followed by CR then the next character printed in the middle of the page!
No Nulls were required if the printer was working properly..
I used one in my Dallas high school computer class in 1978-81 (LHHS). We had the deluxe model with a 110 baud acoustic modem, dialing into an HP-9000 shared by the other high school’s in the Richardson ISD. It was quickly abandoned for the shiny new Apple ][ computers with floppy drives.
I had no idea these machines were so complicated internally.
110 baud acoustic modem! I used something similar back in 83!
What a beauty 😃 Thanks for uploading 🙏😊
Amazing video! I liked it too much!
I keep imagining the work that must be dismantling and assembling this teletype. It was fascinating to watch you masterfully detailing how it works!
One question... Approximately, how many pieces make up this teletype? I imagine it's in the hundreds or thousands!
Congratulations to Malcolm Clark and TNMOC! Incredible work!
I learn a lot watching your videos!
Best Regards,
Marcos Pereira
Rio de Janeiro, Brazil
A machine functioning not unlike this one used to perform in front of a close up TV camera on Saturday afternoons to relay the final football scores on the BBC.. I never had the slightest interest in the scores but was fascinated by the mechanical process...
When working at Ferranti Wythenshawe I received what could well have been the first ASR33 into the UK. It did not work! I called in the UK support, Westinghouse I think, and the service engineer turned up. He was actually trained for cine projectors and was due to go on the Teletype training course the next week! Between the two of us we made some adjustments and it then worked and my prototype A400 teleprinter interface was then able to print.
Hi, Malcolm and well done on an excellent project. Confirming that ASR= Automatic Send and Receive drove me to Wikipedia: en.wikipedia.org/wiki/Teletype_Model_33
I was hoping to see a vintage computing restoration video similar to the sort of videos that GadgetUK164 or Jan Beta upload. The title kind of led me to believe that was what I was going to see here, alas, I think this video _might_ be a case of accidental micro-clickbaityness...
Sorry to disappoint you. It’s certainly not an Amiga or a C64. It’s quite a bit older.