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JohnBHanson · 20th Apr 2017, 8:42 pm

When I was at university I used a Teletype connected to a mainframe via GPO lines. These worked on 80 volt signalling and had a GPO420 4 pole jack socket. The Teletype control unit - which is to the right of the platen was a special I think and had some illuminated push buttons on it.

It also had automatic paper tape reader control and remote power on from the computer and automatic power off after a time at idle. The paper tape control leaver was non latching allowing the computer to control the reading of the paper tape (just in case 10cps was too quick for the computer - and that did happen!).

I have never found any information on these units. Were they a special GPO or ICL/IBM variant of the standard ASR33.

Anybody remember these?

20th Apr 2017, 8:42 pm	#1
JohnBHanson Heptode Join Date: Aug 2009 Location: Worthing, Sussex, UK. Posts: 661	ASR33 Teletype nostalga question When I was at university I used a Teletype connected to a mainframe via GPO lines. These worked on 80 volt signalling and had a GPO420 4 pole jack socket. The Teletype control unit - which is to the right of the platen was a special I think and had some illuminated push buttons on it. It also had automatic paper tape reader control and remote power on from the computer and automatic power off after a time at idle. The paper tape control leaver was non latching allowing the computer to control the reading of the paper tape (just in case 10cps was too quick for the computer - and that did happen!). I have never found any information on these units. Were they a special GPO or ICL/IBM variant of the standard ASR33. Anybody remember these?