[GreenKeys] Teletype Model 27?

[Duncan Brown]

Paul,

Both Kleinschmidt Laboratories and Teletype Corp. bid and build 
prototypes for the US Signal Corps tactical teletypewriter, the TT-4/TG 
in the late 1940s.  Kleinschmidt got the contract in about 1950.

Teletype Corp. apparently gave their version the commercial name "Model 
27" (since it was similar to the M26), but it never went into production.

Have fun,

Duncan
K2OEQ

On 4/30/2026 4:01 PM, paul cembura via GreenKeys wrote:
> My records show a TT4/TG being a Kleinschmidt model 100.
> I have no idea why it is in a Teletype bulletin as a model 27.
> Paul
> mr_rtty
>
>
> On Wednesday, April 29, 2026 at 08:43:43 AM PDT, Nick England via 
> GreenKeys <greenkeys at mailman.qth.net> wrote:
>
>
> All I have is the 1946 Model 27 parts book, which does refer to it as
> the TT-4/TG
> https://www.navy-radio.com/manuals/tty/jh/ttyman8/TeletypeManuals/model27/1138B-Iss1.pdf
>
> I presume that was just a typo for the "KSR-28" which is listed in all
> the PDP-4 literature.
>
> Nick England K4NYW
> Chapel Hill NC
> www.navy-radio.com
>
>
> On Wed, Apr 29, 2026 at 11:14 AM Thalia Archibald via GreenKeys
> <greenkeys at mailman.qth.net> wrote:
> >
> > A mention of a "KSR-27 teletype" caught my attention in these memos 
> on the
> > formation of the DEC Computer Museum in 1979. I'd never heard of 
> this model and
> > I'm surprised it's not one of the more typical models used with a 
> computer. Does
> > anyone know anything about the Model 27?
> >
> >    CONFIGURATION LIST
> >
> >    PDP-4 #1
> >
> >    1 central processor
> >    8K memory
> >    1 line printer (Analex)
> >    2 card readers (Burroughs)
> >    4 tape units (Potter - I think)
> >    1 card punch interface (IBM)
> >    1 Dectape control
> >    2 555 Dectape transports
> >    1 KSR-27 teletype
> >    1 paper tape reader/punch
> >
> > https://www.computerhistory.org/collections/catalog/102740424/
> >
> > This site on telegraph equipment says
> >
> >    Model 27 - referenced in museum book - says that is the model 
> number for
> >    TT-4/TG (XC-2) a proposed military machine with a typing unit 
> like a Model
> >    26 and a keyboard like a Model 31. Says only 10 units were made.  
> Note that
> >    the production TT-4/TG is a Kleinschmidt machine.
> >
> > https://prc68.com/I/Telegraph.shtml
> >
> > Thalia
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> >
> > >>> Jordan Spencer Cunningham's GreenKeys Search Tool: 
> https://teletype.net/gksearch
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> http://comcents.com/tty/greenkeyssearch.html
> >
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> >>> Jordan Spencer Cunningham's GreenKeys Search Tool: 
> https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive: 
> http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive: 
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> http://comcents.com/tty/greenkeyssearch.html
>
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>>>> Jordan Spencer Cunningham's GreenKeys Search Tool:https://teletype.net/gksearch
>>>> 2002-to-present greenkeys archive:http://mailman.qth.net/pipermail/greenkeys/
>>>> 1998-to-2001 greenkeys archive:http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:http://comcents.com/tty/greenkeyssearch.html
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