On Wednesday, April 29, 2026 at 08:43:43 AM PDT, Nick England via GreenKeys <[email protected]> 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

<[email protected]> 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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