[GreenKeys] Teletype Model 27?

[Nick England]

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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