On Thursday, August 27, 2026 at 08:54:03 AM PDT, Nick England via GreenKeys <greenkeys@mailman.qth.net> wrote:

It is a controller for the Teletype Model 40 machines. Different boards for interface, controller, printer, video display etc. Heavy as lead because it has a mongo 5vdc supply for all the logic. Heavy transformer before switching supplies came along.

Photos of a similar box at

You can look up all the boards in M40 literature at

https://www.navy-radio.com/manuals-ttycorp.htm

Nick England K4NYW
Chapel Hill NC
www.navy-radio.com

On Thu, Aug 27, 2026 at 10:15 AM Jeff G via GreenKeys <greenkeys@mailman.qth.net> wrote:

Any clues as to what this is or was?

https://www.ebay.com/itm/198597112620?mkevt=1&plmtId=1100001&mesgId=8604729843702962499&mkpid=0&emsid=enull.m164380.l178264&mkcid=7&ch=osgood&euid&bu=43217797050&trkId=2ae7a790-7486-3ba9-991c-142bafc4aef2&cnvId=375debb5-2944-4697-a3db-a4f8bb676c5d&cnvCtxId=02e3ce37-f254-47c0-ae0d-55af87f80a63&osub=-1%7E1&crd=20260827025256&segname&recoId=198597112620&recoPos=2

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>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
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