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← TST Data
The image on the right shows a typical unit in a
rugged green aluminium enclosure, which is similar to the
earlier TST-4043.
It is powered directly from the 220V mains and all wiring
is at the front.
It is suitable for off-line and on-line use, and is
operated via the connected terminal (computer or telex).
The device is suitable for Latin-based languages
as well as Arabic.
Cryptographic keys are loaded by means of the dedicated TST-0706
(with TST-0502 key card), or manually via the connected terminal.
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The TST-9669 and the OEM version of the 9669 board, were
very successfull and greatly boosted sales throughout the 80s.
They were first shown to the public on the Military Electronics
Defence Expo (MEDE) in 1983 and became an instant world-wide success.
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The TST-9669 was so universal that it was used as the heart of
other TST cipher machines, but also as part of cipher machines
made by other manufacturers, to which it was available as a
third-part OEM product. Below are several examples of the use
of this Eurocard-size PCB.
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The OEM-version of the 9669 was later also used in the
TST-3550 Mark II,
where the basic 9669 board was mounted in a separate shell that
was bolted to the bottom of the TRS-80 Model 102 host computer.
In the early 1990s, the TRS-80 replaced the original TI Silent 700
computer.
➤ More information
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The TST-9669 board was also used as the heart of the earlier
TST-4043 data encryptor, shown in the
image on the right.
➤ More information
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The TST-9667 [3] is a variant of the TST-9669, which has similar
specifications, but different connectors. It connects directly
to a PC, a telex machine and a radio, but requires an external
modem for connecting it to a telephone line.
This was done to
circumvent the time-consuming approval procedures in certain countries.
By using an (already approved) external modem, no explicit approval
was needed for the TST-9667.
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The image on the right shows a typical 9669 OEM board.
At the left of the PCB are the typical 25-way D-type connector
and the 4 LEDs. The board is built around a military-grade
NSC 8000 microprocessor (Z-80 compatible) with external RAM and an
EPROM containing the firmware.
The cryptographic keys are retained in battery-backed static RAM
that can be wiped instantly when security is compromised.
In order to protect the design, the text was removed from some
of the ICs, as can be seen in the image above.
This was common practice in the early 1980s.
In the early 1990s, the NSC 8000 microprocessor was replaced
by the much cheaper Zilog Z-80.
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Forward Error Correction (FEC)
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At the right side of the board is an expansion connector that
allows a small daughter card to be mounted on top.
For customers who wanted to use the encryptor for online
applications, it was possible to add a versatile modem
with built-in Forward Error Correction (FEC).
The image on the right shows the optional TST-082 daughter
card that could be mounted on top of the OEM version of the
9669. It has a fully equipped 300 baud HF-modem with FEC.
The card shown here was a smaller replacement for the earlier
design, and has a dedicated FEC chip.
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Brochure kindly supplied by Helmuth (Jim) Meyer [1].
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© Crypto Museum. Created: Sunday 11 August 2013. Last changed: Friday, 23 December 2022 - 08:41 CET.
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