[GreenKeys] FWIW - Teletype "brag tape"

[Nick England]

Some photos and info are at
http://www.navy-radio.com/tty-relay.htm


On Sun, Nov 18, 2018 at 5:24 PM Nick <creativegardening at hotmail.com> wrote:

> Hi Nick,
>
> Thanks for sharing - very interesting to see the developing time line. I
> am still learning about teletype machines and I'm wondering what a .....
> torn tape switching systems  ..... is.
>
> Nick  -  N0NCQ
>
>
>
> Sent from my T-Mobile 4G LTE Device
>
>
> -------- Original message --------
> From: Nick England <navy.radio at gmail.com>
> Date: 11/18/18 3:56 PM (GMT-05:00)
> To: Greenkeys <greenkeys at mailman.qth.net>
> Subject: [GreenKeys] FWIW - Teletype "brag tape"
>
> I found this in an AT&T response to a govt committee -
>
> EXAMPLES OF TELETYPE'S MAJOR ADVANCES FROM 1930 THROUGH THE
> MIDDLE 1960's
> 1930—Model 15 introduced, using type bars and a stationary platen.
> 1931—The first Selective Calling Private Line System developed (64A and B).
> 1931—Manual TWX introduced, using Model 15 equipment.
> 1935—Model 19 Automatic Send and Receive machine introduced enabling
> preparation of punched tape prior to transmission.
> 1938—Model 26 introduced, new low cost page printer.
> 1940—A major improvement in Selective Calling introduced, known as 81
> type.
> 1941—The ability to receive punched paper tape (with or without
> simultaneous printing on the tape) was introduced to enable a more automated
> transmission capability. (Model 14 Typing Reperforator).
> 1943—Model 15 redesigned for U.S. government to operate at 100 w.p.m.—
> first successful page printer at this speed.
> 1948—First electronic multiplex four-channel system for U.S. government.
> 1950—A totally redesigned machine was developed known as the Model 28.
> This equipment operated at 100 w.p.m. and also enabled functions to be per
> formed (e.g., turning components on/off) under the control of a wired logic
> "stunt box", which contained up to 42 separate actions. In addition, the
> printing mechanism was drastically new, using a "type box", itself
> interchangeable
> and with interchangeable pallets, rather than the traditional type bars
> found
> in the Model 15 and standard office typewriters. Quieter operation was an
> other innovation achieved through the use of sound deadening insulation.
> 1951—First torn tape switching systems.
> 1951—81D Selective Calling introduced, incorporated many automatic fea
> tures such as automatic message pick-up.
> 1952—First electronic Monoplex, especially designed for the DEW line to
> meet special transmission difficulties created by atmospheric conditions.
> 1953—First of high-speed paper tape systems printing at 600 w.p.m. for
> news services.
> 1955—First transistorized electronic multiplex developed for U.S.
> government.
> 1956—Speed of paper tape systems increased to 1000 w.p.m.
> 1957—82 type Automatic Switching System developed for Bell System.
> 1958—Delivery begun on the new 83A/B Selective Calling Systems for
> medium volume customer requirements, providing positive answerback and
> unattended operation.
> 1959-64—Several refinements to the 83B series were effected. By 1964 there
> "were over 1,000 83B Systems in existence.
> 1961—Dataspeed I introduced, providing for high speed (1050 w.p.m.)
> paper tape transmission in standalone terminals.
> 1961—83B Systems interface available for computer use.
> 1962—Dial TWX introduced in Model 33 enabling connection without oper
> ator intervention.
> 1962—Eight-level ASCII coded equipment introduced as Models 33/35.
> Greater accuracy through the use of parity and additional codes required
> for
> computer operations, were the significant innovations. The older Baudot
> code
> equipment only offered 32 (2s) distinct codes, while the ASCII structure
> enabled 128 (27). This equipment was offered on TWX, and Dataphone.
> 1964—Dataspeed V introduced, using parallel transmission, enabled many
> low cost transmitters to connect to central location receiver for data
> collec
> tion. (Like the Dataspeed I. this was a standalone unit.)
> 1965—ASCII coded equipment available for Private Line Selective Calling
> Systems, specifically offered at this time with the line discipline known
> as
> 8A1/8B1.
> 1966—Full computer interface available with the above systems.
> 1966—A new data entry device was developed and introduced, known as the
> "Controlmatic". using the new Model 35 teletypewriters as the basic
> equipment
> for forms entry and paper tape storage.
> 1967—Technological improvement enabled the development of a paper tape
> storage replacement introduced as the "4210 Magnetic Tape Terminal". It
> provided storage for subsequent transmission of up to 150.000 characters of
> data, input from either a Model 33 or 35 teletypewriter. (Subsequent
> development permitted interconnection of this equipment with the Model 37
> and 38
> units as well.)
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-- 
Nick England K4NYW
www.navy-radio.com
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