Homepage

[1][wheel.svg]
Homepage
Crypto
Spy radio
Index
Glossary
World War II
Cold War
Special forces
Stay-Behind
SRAC
OWVL
Receivers
Other
[down.png] [down.png] Countries
Austria
Belgium
Czechoslovakia
DDR
Finland
France
Germany
Hungary
Italy
Japan
Netherlands
Norway
Poland
Sweden
UK
USA
USSR
Yugoslavia
Burst encoders
Intercept
Covert
Radio
PC
Telex
Telephones
People
Agencies
Manufacturers
DONATE
Publications
Standards
For sale
Kits
Shop
News
Events
Wanted
Contact
About us
Links
[2]Follow cryptomuseum on Twitter [3] Watch cryptomuseum on YouTube
Click to search this site
________________________________
×
Search
[4]Click for homepage
[blank.gif]
OWVL
DDR
Stasi

32621 ->
<- 32028

[blank.gif]
Device 32620 Stimme
[blank.gif]
[blank.gif]
Speech/morse generator
Gerät 32620 (Device 32620) was a digital speech generator, developed in
the early 1980s by the Institut für Kosmosforschung ^1 (Space Research
Institute) in the former [5]DDR [6](East-Germany) and manufactured at
the ZWG in Berlin. It was the successor to an analogue tape-based
device known as [7]Schnatterinchen and was used by the East-German
[8]Ministerium für Staatssicherheit ([9]MfS), also known as the
[10]Stasi, for sending secret coded messages to its agents anywhere in
the world, via the mysterious [11]numbers stations that used to be
operated on the short wave (SW) radio bands. The device is known by
[12]different names, including Eiserne Frau (iron lady) and Stimme
(Voice).
Device 32620 measures 290 x 260 x 135 mm and weights approx. 7.1 kg. It
has a sloped front panel with a 25-button keypad, an 8-position
alphanumeric LED display and a [13]5-level paper tape reader. Messages
can be entered manually on the keypad, via the serial port (by modem),
or by means of a pre-recorded [14]paper tape (telex).
Once a message is stored in the internal memory it can be played out
either in [15]morse code or as a spoken message, using a [16]digitized
female voice. When the device is switched off, the messages are
retained by an internal NiCd backup battery.
Device 32620 (Stimme) ready for use
Device 32620 was developed in the early 1980s, to replace the ageing
analogue tape-based [17]Schnatterinchen (cacklerina) devices. The first
protypes were tested by the [18]Stasi in 1983, and in 1984 it was taken
into production. It was used by [19]Stasi ([20]MfS) department HV A
(Hauptverwaltung Aufklärung), for passing messages -- generally
encrypted with the unbreakable [21]One-Time Pad -- to its agents
operating in Western countries. It was also used by the intelligence
services of other [22]Warsaw Pact countries, including the [23]Soviet
Union (USSR) and Poland, and countries like Cuba.
For speech digitizing and duplication of the speech module, [24]Device
32621 -- Programmierhilfe für Gerat 32620 ([25]Programming aid for
Device 32620) -- was available separately. It is currently unknown how
many 32620 device were made, but it is likely that the initial
production batch in 1984 comprised ~ 50 devices, and that at least two
batches of ~ 50 units each were made later. The device featured here,
is a model 32620.2 with serial number 8704. It was manufactured in
February 1987. In 1989, 6 more units were ordered for the HV A (8/A)
and 27 for the IZSU, of which 15 were to be delivered in January 1990
and the remaining 12 in December 1990 [26][3]. ^2
> [27]Hear what the voice sounded like
[blank.gif]
1. Part of the Akademie der Wissenschaften der DDR (East-German
Science Academy).
2. In November 1989 the [28]Berlin Wall fell, so it is unclear whether
these 27 units were delivered.

[blank.gif]
Device 32620 (Stimme) ready for use
[blank.gif]
32620 seen from the front left
[blank.gif]
Front vew
[blank.gif]
Rear view
[blank.gif]
Rear side
[blank.gif]
Rear panel wit open lid (for speech module)
[blank.gif]
Open lid (note the model and serial number on the inside of the lid)
[blank.gif]
Tape reader
[blank.gif]
A
×
A
1 / 8
Device 32620 (Stimme) ready for use
A
2 / 8
32620 seen from the front left
A
3 / 8
Front vew
A
4 / 8
Rear view
A
5 / 8
Rear side
A
6 / 8
Rear panel wit open lid (for speech module)
A
7 / 8
Open lid (note the model and serial number on the inside of the lid)
A
8 / 8
Tape reader
< >

[blank.gif]
Features
[blank.gif]
[blank.gif]
The images below provide a quick overview of the features of the 32620.
All controls are at the front of the device. At the bottom left is the
mains power switch. Above it is a sloped panel with a 25-button keypad
for user input. Above the keypad is an 8-position LED matrix display on
which the current state of the device is shown. To the left of the
keypad is a [29]5-level paper tape reader.
Click to see more
At the top left is the volume control knob for the internal speaker
that is used for monitoring the output of the device. To its right is a
switch to enable the line output (located at the rear). A LED shows
whether or not the line output is currently enabled. To the left of the
display are 3 further LEDs that show the mode (SPEECH or MORSE) and
whether the STANDARD configuration is used.
Click to see more
All connections are at the rear of the device. There is a fixed power
lead for connection to the 110, 127 or 220V mains AC network. In
addition, the device can be powered by an external 12V DC source, such
as the battery of a car. The audio [30]line output is available on a
KS-51 socket. It must be enabled with the LINE switch at the front
panel and can optionally be terminated at 600W* with a switch aside the
socket. There is a built-in speaker, but it is also possible to
connected an external speaker. Depending on the orientation of the
plug, the internal speaker can be disabled.
At the bottom edge is a [31]6-pin military socket that carries the
serial communication lines. They are connected to the SIO (USART) on
the CPU board and allow synchronous or asynchronous serial
communication. It is currently unknown whether this feature was
supported by the firmware. ^1 At the centre is a [32]grey 26-pin EFS-26
socket on which several I/O lines are available. It allows the device
to control external equipment - e.g. a transmitter - and to be remote
controlled itself by external events. At the left is the [33]hinged lid
behind which the [34]speech module must be installed.
> [35]Operating instructions
[blank.gif]
1. In the manual [36][A] this feature is listed as in Vorbereitung (in
preparation).

[blank.gif]
Setup
[blank.gif]
[blank.gif]
The diagram below shows how the 32620 was used. In most cases it was
placed close to the actual (high-power) short wave transmitter (TX), or
at least in the same building, such that the [37]600W* line output of
the 32620 could be connected directly to the input of the transmitter.
The line output carries the audio signal (speech or [38]morse). In case
[39]morse code was used (rather than speech), a switched contact from
the relay board was commonly connected to the transmitter.
[32620_setup.svg]
Although a coded message could be entered on the device's keypad, it
was usually delivered by courier (or [40]telex) on [41]5-level punched
paper tape, and loaded into the device via the tape reader at the front
panel. Alternatively, the message could be sent directly from the Spy
Centre via a (secure) telephone or data line, using a modem that was
connected to the device's serial port.
[blank.gif]
Audio samples
[blank.gif]
[blank.gif]
Below are the contents of the German and Spanish speech modules. Click
them to discover what the voice sounded like. The 4th audio file is a
real broadcast from a Russian station (in German) that was recorded as
late as 2019 by Karsten Hansky [42][8]. Click [43]here for more real
broadcasts.

[44][wav.gif]
[45]All German words (47KB WAV file)
Audio format not supported by your browser
[46][wav.gif]
[47]All Spanish words (64KB WAV file)
Audio format not supported by your browser
[48][wav.gif]
[49]All English words (by Polish speaker) (52KB WAV file)
Audio format not supported by your browser
[50][mp3.gif]
[51]G06 · 24 April 2014 (2MB MP3 file)
Audio format not supported by your browser

> [52]More examples of real broadcasts
HELP PLEASE -- At present, German and Spanish are the only languages of
which we have the original [53]EPROM contents. These are the only two
languages that were recorded with the same [54]female voice at
Funkobject Kasselberg in the [55]DDR. All other languages (e.g. Polish,
English and Russian) were recorded by the country which operated the
device, using the [56]32621 programming aid. We would very much like to
add other languages to our list. If you can provide the EPROM contents
for such languages, please [57]contact us.
[blank.gif]
Female voice
[blank.gif]
[blank.gif]
From 1961 onwards, the woman ^1 shown in the image below, was one of
the female speakers of the East-German numbers stations. Like most of
the speakers, she was living with her family on the compound of
Funkobject ^2 Kesselberg. Initially the numerical messages were read
live in one of the small studios in the basement of the Kesselberg
site, where they were recorded on tape.
The tapes were then played back at specific times via a strong short
wave (SW) transmitter with an output power between 10 and 100 kW.
In 1963/1964, whilst she was was on leave to give birth to a child, she
was asked to lend her voice to the new [58]Schnatterinchen device, that
had just been developed. In the small studio in the basement, each word
had to be fitted onto a piece of audio tape that was just 12-15 cm
long.
According to her own account [59][4], the words Achtung (Attention) and
Sieben (Seven) were the most difficult to record. Furthermore, the
words had to be pronounced in such a way that they could be
discriminated unambiguously through a noisy narrowband short wave radio
channel. The pre-recorded tape segments were later mounted onto the
discs of the [60]Schnatterinchen device.
Some time later she was also asked to lend here voice to the Spanish
version of the machine, which was subsequently recorded in the studio
of the [61]DDR broadcasting service ^3 in Berlin. In the early 1980s,
the same voice was digitized for use in the digital Device 32620
featured here.
[sprecherin.jpg]
For the lady in the picture, this meant the end of an era, but in the
following years, she frequently tuned in to the [62]Stasi frequencies
on the short wave radio band, to confirm that here voice was still
being used. In January 2010, she wrote a letter in which she explained
here role as the voice [63][4].
> [64]Read the full letter
[blank.gif]
1. The name of the female speaker is currently unknown.
2. Literally translated 'Radio Object' - here used to identify a site.
3. Rundfunkhaus der DDR, Nalepastraße, Berlin (East Germany).

[blank.gif]
Speech samples
[blank.gif]
[blank.gif]
Below is an overview of the sound samples for the German language,
along with their associated keys and [65]morse code equivalents. Note
the distinct - non-standard - pronunciation. > [66]Play all
Key
Morse German Pronunciation Description #
0 - Nul Nul Zero 1
1 .---- Eins Eins One 2
2 ..--- Zwei Zwo Two 3
3 ...-- Drei Drei Three 4
4 ....- Vier Vier Four 5
5 ..... Funf Fun-nuf Five 6
6 -.... Sechs Sechs Six 7
7 --... Sieben Sie-ben Seven 8
8 ---.. Acht Acht Eight 9
9 ----. Neun Neu-en Nine 10
: ...- Achtung Achtung Attention (start) 11
/ ........ Trennung Trennunk Separation (space) ^1 12
+ ...-.- Ende Ende End (stop, end of transmission) ^2 13
> [67]Operating instructions
[blank.gif]
1. According to the operating instructions [68][A], the morse code for
the / sign is (
-..-.
), but this is incorrect. In reality, the code (
.........
) is played indefinitely, and should be avoided when sending a
message in [69]morse code.
2. According to the operating instructions [70][A], the morse code for
the + sign is (
.-.-.
), but this is incorrect. The code that is played when the + key is
pressed is (
...-.-
), which means SK (Silent Key).

[blank.gif]
Predecessor Schnatterinchen
[blank.gif]
[blank.gif]
Device 32620 was the successor to an analogue machine known as
[71]Schnatterinchen (Cacklerina), that was developed in 1964/1965. It
used short pieces of audio tape - fitted onto circular discs - as the
storage medium.
> [72]More information
Drum with 13 discs
[blank.gif]
Video footage
[blank.gif]
[blank.gif]
Quite a bit of footage that shows the 32620 in action, can be found on
YouTube, most of which was published by Peter Staal in The Netherlands
[73][6] and were recorded at the home of German collector Detlev
Vreisleben in 2010 [74][2]. They show one or more machines in action
and demonstrate how to alter the language. Below are some examples.

IFRAME: [75]https://www.youtube.com/embed/9MY8HblDAHQ

IFRAME: [76]https://www.youtube.com/embed/TP-gZ7PgAK8

IFRAME: [77]https://www.youtube.com/embed/ocWASywcsAU

Various demonstrations of a 32620 device on YouTube

[blank.gif]
Block diagram
[blank.gif]
[blank.gif]
Below is the block diagram of the 32620. The device consists of a rack
with plug-in cards, a power supply unit ([78]PSU) and several PCBs that
are fitted behind the front panel. The [79]PSU is not shown in the
diagram. At the heart of the system is the CPU board (DBZ-80-1), which
is built around a Zilog Z-80 microprocessor, ^1 two parallel I/O
expanders (PIO) and one serial port (SIO).
The PIOs are used for interfacing to the keypad and the display. The
SIO, also known as a USART, is for (a)synchronous serial communication
with the outside world. It allows data to be sent to the device via a
telephone modem. Also present on the CPU board, is the EPROM ^2 that
contains the [80]firmware, and two SRAMs of 4kB each. The CPU runs at
2.458 MHz (crystal frequency 9.832 MHz).
[32620_block.svg]
An additional board (DBE) provides two additional PIOs that are used
for interfacing the [81]relay board, the [82]audio board and the tape
reader (at the [83]front panel). On version 1 of the device, this board
also contains a second 2716 or 2732 EPROM. On version 2 of the device
(32620.2), this EPROM is omitted, whilst a double-size 2764 EPROM (8kB)
is fitted on the CPU board.
The [84]audio board contains the digital-to-analog (D/A) converter and
the audio amplifier. It provides a signal to the built-in speaker, plus
a line-level output for the radio transmitter. The relay board provides
a number of galvanically separated (isolated) contacts that can be used
to control external equipment. It also has a number of inputs that
allow the device to be triggered by external events. The relay board
also contains a NiCd backup battery for the CMOS SRAM.
The speech data (i.e. the sound samples) is held in the separate
[85]speech module, which should be intalled behind the [86]hinged lid
at the rear of the device. The speech module consists of one or two
PCBs (speech cards), each of which holds six 2764 (8kB) EPROMs and
additional logic circuits.
[blank.gif]
1. Or the Eastern Bloc variant UB880. > [87]Wikipedia
2. Type 2716 (2kB) or 2732 (4kB). Version 2 of the CPU board has a
2764 (8kB) EPROM.

Click to see more

[88]Interior of 32620.2 (version 2)

[blank.gif]
Interior
[blank.gif]
[blank.gif]
The device consists of two building blocks: the system unit, which
consists of a backplane with a number of plug-in cards and the mains
power supply unit ([89]PSU), and a sloped front panel, behind which the
remaining printed circuit boards (PCBs) are hidden. The interior can be
accessed by removing four screws from the rear panel and two screws
from the top, after which the top, rear and side panels can be removed.
The front panel is held in place by four screws at the corners.
[blank.gif]
CPU board DBZ
[blank.gif]
[blank.gif]
The CPU board is the heart of the device. It is built around a UB880
microprocessor made by MME - an unlicenced clone of the Zilog Z-80
[90][9]. It runs at 2.458 MHz and is complemented by a SIO and two
PIOs. The latter are the interface to the keyboard and the display at
the front panel.
This board also contains the two SRAMs (i.e. the message buffer) and
the EPROM with the system firmware. Note that on version 2 of the board
(shown in the image on the right), the EPROM is twice as large as on
version 1, whilst the EPROM of the adjacent [91]expansion board is
omitted.

CPU board
As the 58-pin EFS58 AB backplane connector does not have enough pins to
bring out all the I/O lines from the two PIOs, an extra EFS58 AB socket
is provided at the rear end of the board.
This socket is fitted with an EFS58 plug that is wired to the front
panel, as shown in the image on the right. The wire bundle is long
enough to allow an [92]extension board to be fitted between the CPU
card and the backplane (for repair).
The expansion card (to the left of the CPU card), it fitted with a
similar plug and wire bundle.

Female EFS58 AB socket at the rear end of the CPU card
[blank.gif]
Expansion board DBE
[blank.gif]
[blank.gif]
The interfacing capabilities of the Z-80 platform are further enhanced
with the expansion board shown in the image on the right. It holds two
additional PIOs that are used to drive the [93]audio board, the
[94]relay board and the tape reader. It also holds the select lines for
the speech cards.
On version 1 of the device (32620), this board also holds a second
EPROM. This EPROM is missing from the expansion board in version 2
devices (32620.2). At the rear end of the card is an additional EFS58
AB socket on which the I/O lines from the PIOs are brought out.

IO board
[blank.gif]
Audio board
[blank.gif]
[blank.gif]
The audio board holds the digital-to-analog (D/A) converter and the
audio amplifier. It drives the built-in loudspeaker (embedded in the
rear panel) and also provides the (600W*) line output for connection to
a short-wave (SW) transmitter.
At the centre of the edge of the board is the 600W* output transformer.
The output level can be adjusted with the recessed potentiometer.

Audio board
[blank.gif]
Relay board
[blank.gif]
[blank.gif]
The relay board provides a galvanically separcated interface to the
outside world. It has a number of isolated relay contacts that can be
used to drive external equipment. In addition, the board can receive
external triggers for starting a message.
This board als holds a rechargeable 2.4V NiCd battery (two stacked 1.2V
cells) that is used to retain the contents of the CMOS SRAMs (i.e. the
message buffer) when the device is switched off. The battery is housed
inside the orange cylinder.

Relay board with backup battery
[blank.gif]
Speech module
[blank.gif]
[blank.gif]
The sound samples for a particular language are held in a [95]removable
speech module that must be installed behind the [96]hinged lid at the
[97]rear of the device. The speech module contains one or two PCBs,
each of which holds six 2764 EPROMs of 8kB each, in which the spoken
words are stored.
As this module was missing from the device in our collection, we have
reverse-engineered it and have created the working reproduction shown
in the image on the right.
> [98]Reproduction speech module

Reconstructed speech cartridge. Click for full description.
[blank.gif]
Front panel
[blank.gif]
[blank.gif]
The remaining peripherals -- the keyboard, the display, the tape reader
and a couple of LED indicators -- are fitted behind the sloped front
panel. The front panel is electrically connected to the system unit by
means of a wide EFS-58 male connector and a small 3-pin connector.
The image on the right shows the rear side of the front panel. The
large PCB is the keypad. At the top left is a stack of three PCBs that
are fitted to the rear of the display. They hold the character
generator and the display driver. At the right is the tape reader.

Front panel - rear side
[blank.gif]
Power supply unit
[blank.gif]
[blank.gif]
The rightmost plug-in board (seen from the rear) is the [99]Power
Supply Unit (PSU). It is also the largest plug-in unit and is connected
to the backplace by means of a [100]combi-connector.
The mains power transformer is part of the PSU module. The image on the
right shows the PSU with the printed circuit board (PCB) temporarily
dismounted. It holds quite a few electrolytic capacitors which should
be replaced by modern alternatives as part of a restoration.
PSU with dismounted PCB
[blank.gif]
Case without cover
[blank.gif]
Interior
[blank.gif]
Interior - rear view
[blank.gif]
Speaker and sockets mounted in the rear panel
[blank.gif]
Device 32620 with removed front panel
[blank.gif]
Backplane wiring
[blank.gif]
Backplane
[blank.gif]
Interior
[blank.gif]
CPU board
[blank.gif]
CPU board (component side)
[blank.gif]
CPU board (solder side)
[blank.gif]
CPU board with 8K EPROM (version 2)
[blank.gif]
ICs hidden under the SRAMs and EPROM
[blank.gif]
CPU board modifications
[blank.gif]
Female EFS58 AB socket at the rear end of the CPU card
[blank.gif]
IO board
[blank.gif]
IO board (component side)
[blank.gif]
IO board (solder side)
[blank.gif]
Audio board
[blank.gif]
Audio board
[blank.gif]
Audio board (component side)
[blank.gif]
Audio board (solder side)
[blank.gif]
Relay board with backup battery
[blank.gif]
Relay board with backup battery (restored)
[blank.gif]
Relay board with backup battery (component side)
[blank.gif]
Relay board with backup battery (solder side)
[blank.gif]
Front panel detached
[blank.gif]
Front panel - rear side
[blank.gif]
Front panel sub-PCB
[blank.gif]
Character generator board
[blank.gif]
Character generator board
[blank.gif]
Tape reader seen from the inside of the device
[blank.gif]
Power Supply Module (PSU)
[blank.gif]
PSU - solder side
[blank.gif]
Backplane connector
[blank.gif]
Side view
[blank.gif]
PSU with dismounted PCB
[blank.gif]
PSU board with many electrolytic capacitors
[blank.gif]
Crypto Museum speech cartridge
[blank.gif]
Crypto Museum speech cartridge
[blank.gif]
B
×
B
1 / 40
Case without cover
B
2 / 40
Interior
B
3 / 40
Interior - rear view
B
4 / 40
Speaker and sockets mounted in the rear panel
B
5 / 40
Device 32620 with removed front panel
B
6 / 40
Backplane wiring
B
7 / 40
Backplane
B
8 / 40
Interior
B
9 / 40
CPU board
B
10 / 40
CPU board (component side)
B
11 / 40
CPU board (solder side)
B
12 / 40
CPU board with 8K EPROM (version 2)
B
13 / 40
ICs hidden under the SRAMs and EPROM
B
14 / 40
CPU board modifications
B
15 / 40
Female EFS58 AB socket at the rear end of the CPU card
B
16 / 40
IO board
B
17 / 40
IO board (component side)
B
18 / 40
IO board (solder side)
B
19 / 40
Audio board
B
20 / 40
Audio board
B
21 / 40
Audio board (component side)
B
22 / 40
Audio board (solder side)
B
23 / 40
Relay board with backup battery
B
24 / 40
Relay board with backup battery (restored)
B
25 / 40
Relay board with backup battery (component side)
B
26 / 40
Relay board with backup battery (solder side)
B
27 / 40
Front panel detached
B
28 / 40
Front panel - rear side
B
29 / 40
Front panel sub-PCB
B
30 / 40
Character generator board
B
31 / 40
Character generator board
B
32 / 40
Tape reader seen from the inside of the device
B
33 / 40
Power Supply Module (PSU)
B
34 / 40
PSU - solder side
B
35 / 40
Backplane connector
B
36 / 40
Side view
B
37 / 40
PSU with dismounted PCB
B
38 / 40
PSU board with many electrolytic capacitors
B
39 / 40
Crypto Museum speech cartridge
B
40 / 40
Crypto Museum speech cartridge
< >

[blank.gif]
Restoration
[blank.gif]
[blank.gif]
When we obtained our 32620 device in 2017 [101][1], it was in an
unknown state. The device had previously been working, but the speech
module had gone missing and could not be retrieved. After switching the
device ON, the display showed [102]ERROR 15, indicating that the
[103]speech module was indeed missing. Pressing the STA/STP button,
produced random characters on the display.
In addition, the second row of pixels of the LED display was dead, as
shown in the image on the right. It was decided to address this problem
first, as it did not require the presence of a speech module. The most
likely candidate for the cause of the problem, was the display driver.

Second row of pixels missing
After studying the circuit diagram [104][C], it was confirmed that the
cause had to be found either on the [105]character generator board
(1.12) in the circuit around D3 and VT2, or on the display board (1.11)
in the circuit around VT2. It turned out that the 22K resistor R10
(between D3 and VT2) on the character generator board had a crack.
After replacing it, the display was complete again.
The next problem to address was the random nature of the display
contents after pressing the STA/STP button. All plug-in cards were
removed and inspected physically. It turned out that the backup battery
for the SRAMs had been leaking and had caused damage to the relay
board.
The NiCd cells were removed from the orange cylinder on the [106]relay
board and were replaced by a 1.5F/5V supercap. ^1 The tracks at the
bottom of the PCB were [107]cleaned and restored, and the cylinder was
refitted. In addition, the [108]wiring between the battery and the PCB
was replaced.
Corroded tracks (caused by leaking backup battery)
It was now possible to clear the contents of the SRAMs, by pressing
(CLR) followed by (EX). It was also possible to set the mode to MORSE,
turn on the KEYBOARD MONITOR and enter a message manually on the
keypad. After entering random digits, the message was terminated with
the (+) key, after which the [109]display showed READY. Pressing
(STA/STP) now played back the message.
As some of the buttons on the keypad were unresponsive, several of them
were desoldered from the keypad PCB and taken apart, so that their
interior could be cleaned thoroughly.
Inside each button is gold-plated contact strip on which a
spring-loaded pad of conducting rubber is pushed down. Both the contact
strip and the rubber pad were cleaned with alcohol and tested for
conductivity before reassembling it and soldering it back in place on
the keypad PCB. This part of the restoration has improved the overall
reliability of the keypad considerably.
Removing a key cap
Another problem with equipment of this age is that most of the
electrolytic capacitors will have lost their capacity by now. The
Frolyt capacitors that are used in our 32620 are notorious for this, as
are the capacitors from many other brands from the 1970s-1990s, also in
the Western world.
As a precaution, it was decided to replace all electrolytic capacitors
on all of the plug-in cards. When doing this, be especially careful
with the CPU board. It is very sensitive to electrostatic discharge and
the solder pads are very close to the adjacent tracks. As there is no
solder mask, a barely visible short circuit is easily created. We also
added 100 nF capacitors to the digital ICs. ^2
This repair also cured the problem of a 'frozen' device after several
hours of use. It was caused by a degraded capacitor in the reset
circuit, that would short out after the device had warmed up.
Replaced capacitors. Note how close the tracks are to the solder pads.
The next problem to address was the [110]tape reader at the front left
of the device. Although it was in a [111]cosmetically good condition,
it didn't run when the the tape-feed button was pressed. A closer
inspection told us that the motor wanted to run - it was running hot -
but was somehow blocked.
After removing the tape reader from the front panel, it became clear
that the ball bearings at both sides of the rubber pressure roller -
which resides under the paper path - were rusty and were binding. It
appears that the device had caught some water drops at some point in
its life, which had not been treated appropriately.
The motor was temporarily removed, after which the ball bearings were
treated with a derusting agent, penetrating oil, a quick drying cleaner
and alcohol. Finally, the bearings were regreased and the small motor
was mounted back in place.
Tape reader seen from the front left
After refitting the tape reader to the front panel, the unit was
tested. Pressing the tape-feed button turns the motor on and feeds the
paper at high speed. In addition, a message could be loaded by
installing a tape, pressing the INP(UT) button and answering 'Y' to the
question TR?.
At this point, the only remaining problem was the reconstruction of the
sound module. This required the development of a printed circuit board
(PCB) that could hold one or more EPROMs with the sound samples for a
specific language.
Although a single board is sufficient for German, other languages, such
as Spanish, may require an extra card to be used. As modern EPROMs are
generally larger than the old 2764 devices used on the original speech
card, we decided to use a single 27C020 on each card, so that we could
store up to four languages in a single module.
Crypto Museum speech cartridge
An extra difficulty was the fact that the backplane requires the use of
a specific 58-pin connector that was only made in the former [112]DDR
and a metal frame that was used in early [113]DDR computers. Luckily,
there were some very kind people on the Robotron Forum who were able to
help us out. Our 32620 is now fully operational again and can play out
messages in 4 languages plus [114]morse.
> [115]Description of the reproduction speech module
[blank.gif]
1. A supercap is a good alternative for a rechargeable NiCd battery,
especially in low-current applications like powering CMOS SRAM
chips. The supercap used here, has a capacity of 1.5 Farad, which
is sufficient for retaining a message for at least several weeks.
Unlike batteries, supercaps do not leak.
2. When designing digital circuits, it is good practice to connect a
100nF decoupling capacitor from the +V to ground, as close to the
IC as possible. In the early days of digital design, these 100nF
capacitors were often omitted, as a result of which circuits could
become unstable and unreliable.

[blank.gif]
Problems
[blank.gif]
[blank.gif]
* [DEL: Error 15 (speech module missing) :DEL]
* [DEL: Second row of pixels missing from display :DEL]
* [DEL: Device 'freezes' after several hours of use :DEL]
* [DEL: Arrow symbols missing from next/previous buttons :DEL]
* [DEL: Backup battery worn out and leaking :DEL]
* [DEL: Electrolytic capacitors worn out :DEL]
* [DEL: Unresponsive keys on keypad :DEL]
* [DEL: Tape reader motor not working (running hot) :DEL]

[blank.gif]
Fixed
[blank.gif]
[blank.gif]
* Broken EFS-58 connector at rear end of expansion board repaired.
* 2nd pixel row of display fixed: R10 (22k) on board _1.12 replaced.
* Arrow symbols added to next/previous buttons.
* Backup battery swapped for 1.5F/10V supercap.
* Electrolytic capacitor swapped on Relay board.
* All electrolytic capacitors swapped on CPU board.
* All electrolytic capacitors swapped in [116]PSU.
* 6 buttons of the keypad removed, disassembled, cleaned and
refitted.
* Tape reader repaired and greased.
* [117]Output cable KS-51 -- XLR added.
* [118]Speech cartridge reconstructed.

[blank.gif]
Second row of pixels missing
[blank.gif]
Second row of pixels missing
[blank.gif]
Character generator board
[blank.gif]
Corroded tracks (caused by leaking backup battery)
[blank.gif]
Relay board with backup battery (restored solder side)
[blank.gif]
Relay board with backup battery (restored)
[blank.gif]
Removing a key cap
[blank.gif]
Replaced capacitors. Note how close the tracks are to the solder pads.
[blank.gif]
Tape reader
[blank.gif]
Inside the tape reader
[blank.gif]
Tape reader seen from the inside of the device
[blank.gif]
Tape reader seen from the front left
[blank.gif]
Tape reader seen from the front right
[blank.gif]
Tape reader seen from the front
[blank.gif]
Tape reader seen from the rear right
[blank.gif]
Tape reader seen from the top
[blank.gif]
Audio line cable
[blank.gif]
Crypto Museum speech cartridge
[blank.gif]
Crypto Museum speech cartridge
[blank.gif]
Crypto Museum speech cartridge
[blank.gif]
C
×
C
1 / 20
Second row of pixels missing
C
2 / 20
Second row of pixels missing
C
3 / 20
Character generator board
C
4 / 20
Corroded tracks (caused by leaking backup battery)
C
5 / 20
Relay board with backup battery (restored solder side)
C
6 / 20
Relay board with backup battery (restored)
C
7 / 20
Removing a key cap
C
8 / 20
Replaced capacitors. Note how close the tracks are to the solder pads.
C
9 / 20
Tape reader
C
10 / 20
Inside the tape reader
C
11 / 20
Tape reader seen from the inside of the device
C
12 / 20
Tape reader seen from the front left
C
13 / 20
Tape reader seen from the front right
C
14 / 20
Tape reader seen from the front
C
15 / 20
Tape reader seen from the rear right
C
16 / 20
Tape reader seen from the top
C
17 / 20
Audio line cable
C
18 / 20
Crypto Museum speech cartridge
C
19 / 20
Crypto Museum speech cartridge
C
20 / 20
Crypto Museum speech cartridge
< >

[blank.gif]
Connections
[blank.gif]
[blank.gif]
All connections of the 32620 are located at the rear panel. There are
sockets for connection of an external speaker, transmission line
(Leitung) and serial port (RS232). There is also an expansion socket
(Bu1) for driving external equipment and for responding to external
events. Below is the pinout of the sockets, as seen when looking into
the sockets from the rear of the device.
[blank.gif]
LINE output
[blank.gif]
[blank.gif]
The line output of the device is available on a 5-pin screw socket at
the rear of the device. This socket is similar (but not identical) to a
5-pin DIN socket. It accepts [119]RFT plug KS 51 with external thread
(type 063-01:00), a.k.a. TGL 31428. Below is the pinout when looking
into the socket.
1. Line out (A)
2. unused
3. Line out (B)
4. unused
5. unused

[line_socket.svg]

[blank.gif]
DATA input
[blank.gif]
[blank.gif]
Also at the rear is a 6-pin military socket on which a serial port is
available. The port is driven by the SIO on the CPU board, and can be
synchronous as well as asynchronous. In the latter case, no hardware
handshaking is used. Below is the pinout when looking into the socket.
A. Clock
B. TX Data
C. unused
D. GND (0V)
E. unused
F. RX Data

[data_10_6S.svg]

[blank.gif]
External switchboard Bu 1
[blank.gif]
[blank.gif]
At the rear is a 26-pin socket for controlling external equipment and
for driving the 32620 from external events. The socket is an EFS26 AB
female part. The upper nine rows (1-9) are connected to the isolated
contacts of three internal relays (rs 1, 2, 3). The lower four rows
(10-13) are for the external inputs. Below is the layout when looking
into the socket from the rear of the device.
1. A: rs 2/2 n.o. ^4
B: rs 2/1 n.c. ^4
2. A: rs 2/2 n.c. ^4
B: rs 2/1 n.o. ^4
3. A: rs 2/1 common ^4
B: rs 2/2 common ^4
4. A: rs 1 n.o ^3
B: rs 3/1 common ^4
5. A: rs 1 common ^3
B: rs 3/2 n.o. ^5
6. A: unused
B: rs 3/2 n.c. ^5
7. A: unused
B: rs 3/1 n.c. ^5
8. A: unused
B: rs 3/1 n.o. ^5
9. A: unused
B: rs 3/2 n.o. ^5
10. A: Remote ^1
B: GND
11. A: Latched ^2
B: GND
12. A: STA/STP[1]
B: STA/STP[2]
13. A: OUT[1]
B: OUT[2]
n.o. = normally open, n.c. = normally closed

[32620_external.svg]

[blank.gif]
1. Remote start/stop input (active high).
2. When connected to GND (active low).
3. RS1 = Morse output.
4. RS2 = Running.
5. RS3 = END.

[blank.gif]
Specifications
[blank.gif]
[blank.gif]
* Type
Speech/morse generator
* Purpose
Transmission of coded messages in speech or morse
* Memory
3791 characters (including spaces)
* Backup
Internal 2.4V NiCd battery
* Morse
Tone or relay contact
* Tone
800, 1000 or 1200 Hz
* Speech
2 x 48kB (max. 13 words, 16 seconds)
* Speed
30 to 240 characters per minute (morse) in 10 steps
70 - 110 words per minute (speech)
* Pitch
0%, -10%, +10%
* Input
[120]5-level paper tape (ITA-2) (CCITT-2)
Manual (via keybord)
RS232 serial port (modem)
* Output
Audio 600W* 0 - +6dB (adjustable)
Relay contact (morse only)
Internal speaker
External speaker
* Speaker
500mW into 6W*
* Remote
STA/STP, OUT
* Serial
Synchronous or asynchronous (RS232) serial port
* Mains
110, 127 or 220V AC (switchable), 22 Watt
* Battery
12V DC, 2A
* Temperature
+5 to +40°C
* Storage
0 to +55°C
* Humidity
90% (max.)
* Dimensions
290 x 260 x 135 mm
* Weight
7.1 kg

[blank.gif]
Nomenclature
[blank.gif]
[blank.gif]
Although the device was officially designated 2620 (later: 32620) (i.e.
the Stasi project number) ^1 it was known by its users under various
names, the most common of which are listed below.
* Gerät 2620
Device 2620
* Gerät 32620
Device 32620
* Sprach-Morse-Generator
Speech-Morse-Generator
* Stimme
Voice
* Eiserne Frau
Iron lady
* Kluge Frau
Clever lady
* Schlaue Frau
Smart lady

[blank.gif]
1. When the development of the device was initiated in the late 1970s,
it was given the Stasi project number 2620. This number was later
prefixed with a '3', which is the last digit of Stasi department
Abteilung 33.
> [121]More about Stasi project numbers

[blank.gif]
Known serial numbers
[blank.gif]
[blank.gif]
Below is an non-exhaustive list of model and serial numbers of 32620
devices that may help to determine how many units were manufactured. It
is likely that the first two digits of the serial number represent the
year of manufacturing. Please report any devices that are not listed
here. The model, version and serial number are printed inside the
[122]hinged lid at the rear. > [123]Contact us
* 3 2620
8401
?
?
* 3 2620
8402
?
?
* 3 2620
8409
?
?
* 3 2620
8410
?
?
* 3 2620
8414
?
?
* 3 2620
8415
?
?
* 3 2620
8501
1985 Nov
?
* 3 2620
8515
1985 Nov
Spionagemuseum Berlin (Germany)
* 3 2620.2
8704
1987 Feb
Crypto Museum (Netherlands)
* 3 2620.2
8729
1987 Feb
?
* 3 2620.2
8732
1987 Feb
?

From this list is is clear that there were at least three production
batches: in 1984, 1985 and 1987 respectively. It is also known that
additional units were ordered in 1989. If each production batch
consisted of 50 units, it is likely that between 150 and 200 units were
manufactured.
[blank.gif]
EPROM contents
[blank.gif]
[blank.gif]
Please note that there are two versions of the device. The first
version (32620) uses two system EPROMs: one on the CPU board and one on
the expansion board. These are 2716 (2kB) or 2732 (4kB) types.
Furthermore, the speech board has room for six 2764 EPROMs (8kB), which
is sufficient for the German language, but not for Spanish, which
required 8 such EPROMs.
The boards of the second version of the device (32620.2) are completely
different. There is only one system EPROM, which is a 2764 (8kB). It is
likely that it contains the contents of both the former system EPROMs
(from the CPU board and the expansion board). Furthermore, the speech
board has been enhanced to accomodate eight 2764 EPROMs, which is
sufficient for Spanish.
[blank.gif]
Download
[blank.gif]
[blank.gif]
* [124]Speech module German, 6 ROMs (better version)
* [125]Speech module German, 6 ROMs (older version)
* [126]Speech module Spanish, 8 ROMs
* [127]Speech module English (Poland), 7 ROMs
* [128]CPU EPROM 2764 (8kB) for 32620.2 (S/N 8704)
* [129]Display EPROM (2kB)

[blank.gif]
1. Recreated by Crypto Museum from surviving recordings.

[blank.gif]
Datasheets
[blank.gif]
[blank.gif]
a. [130]EPROM 2764 (8kB)
ST Microelectronics, 2000.
b. [131]µPD446 2048 x 8 bit static CMOS RAM
NEC, December 1980.

[blank.gif]
Literature
[blank.gif]
[blank.gif]
a. [132]Detlev Vreisleben, Agentenfunk und die verwendeten
Verschlüsselungsverfahren
Radio Kurier - welweit hören, December 2011. pp. 26-31.

[blank.gif]
Documentation
[blank.gif]
[blank.gif]
A. [133]Gerat 32620 Sprach - Morsegenerator (German) ^1
Operating Instructions. Extracted from [134][C].
[135]MfS, 18 February 1985. 27 pages.
B. [136]Bedienungsanleitung Gerät 32620 ^1,2
Operating instructions for Device 32620 (handwritten draft).
March 1983. MfS-OTS Nr. 4060.
C. [137]Sprach-Morse-Generator und Programmiergerät 32620 / 32621 ^1
Full description of Speech-Morse-Generator and Programming Aid
(German).
Nr. 1176-0.1 KB (4). February 1985. MfS-OTS Nr. 4061.
> [138]More about Device 32621 (programming aid)

[blank.gif]
1. Document from BStU archives [139][7], kindly supplied by Detlev
Vreisleben [140][2].
2. In the handwritten draft, the device is identified as 32026, which
is clearly wrong and should be 32620.

[blank.gif]
References
[blank.gif]
[blank.gif]
1. Anonymous, Device 32620.2 - THANKS !
Crypto Museum, July 2017.
2. Detlev Vreisleben, Personal correspondence
July 2017 -- January 2022.
3. [141]Operativ-Technische Sektor, Abteilung 33, Leistungsplan 1990
fuer die KST: 3360 ^2
VVS B77-89, 14 October 1989. Pages 1 and 7.
4. [142]Anonymous, Letter from female East-German 'numbers speaker'
30 January 2010.
5. [143]Bundesbeauftragte für die Stasi-Unterlagen (BStU) ^1
Federal Commissioner for the Stasi-Records.
6. [144]Peter Staal, YouTube channel
Retrieved July 2017.
7. [145]Jorg Drobick, YouTube channel
Retrieved July 2017.
8. [146]Karsten Hansky, Sound samples of current Numbers Stations
Received August 2015 - September 2019. Many thanks!
9. [147]Wikipedia, U880
Retrieved December 2021.

[blank.gif]
1. Full name: Bundesbeauftragte für die Unterlagen des
Staatssicherheitsdienstes der ehemaligen Deutschen Demokratischen
Republik ([148]DDR) -- Federal Commissioner for the Records of the
[149]State Security Service of the former German Democratic
Republic ([150]GDR) -- officially abbreviated to BStU.
2. Document from BStU archives [151][5], kindly supplied by Detlev
Vreisleben [152][2].

[blank.gif]
Further information
[blank.gif]
[blank.gif]
* [153]Operating instructions
* [154]Speech module (reproduction)
* [155]Device 62321, programming aid
* [156]Schnatterinchen, the analogue predecessor
* [157]About Numbers Stations
* [158]About morse code
* [159]About the Stasi
* [160]Examples of real broadcasts
* [161]Other DDR spy radio equipment

[blank.gif]
Any links shown in red are currently unavailable. If you like the
information on this website, why not make a [162]donation?
© Crypto Museum. Created: Wednesday 19 July 2017. Last changed: Friday,
18 February 2022 - 22:10 CET.
[blank.gif]
[163]Click for homepage

References

Visible links
1. https://www.cryptomuseum.com/index.htm
2. https://www.twitter.com/cryptomuseum
3. https://www.youtube.com/user/cryptomuseum
4. https://www.cryptomuseum.com/index.htm
5. https://www.cryptomuseum.com/spy/ddr.htm
6. https://www.cryptomuseum.com/spy/ddr.htm
7. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/index.htm
8. https://www.cryptomuseum.com/intel/stasi/index.htm
9. https://www.cryptomuseum.com/intel/stasi
10. https://www.cryptomuseum.com/intel/stasi
11. https://www.cryptomuseum.com/spy/owvl/index.htm
12. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#nom
13. https://www.cryptomuseum.com/ref/ita2
14. https://www.cryptomuseum.com/ref/ita2
15. https://www.cryptomuseum.com/radio/morse/index.htm
16. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#voice
17. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/index.htm
18. https://www.cryptomuseum.com/intel/stasi
19. https://www.cryptomuseum.com/intel/stasi
20. https://www.cryptomuseum.com/intel/stasi
21. https://www.cryptomuseum.com/crypto/otp/index.htm
22. https://www.cryptomuseum.com/spy/glossary.htm#wp
23. https://www.cryptomuseum.com/spy/glossary.htm#soviet
24. https://www.cryptomuseum.com/spy/owvl/32620/32621.htm
25. https://www.cryptomuseum.com/spy/owvl/32620/32621.htm
26. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_3
27. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#samples
28. https://www.cryptomuseum.com/spy/glossary.htm#berlin_wall
29. https://www.cryptomuseum.com/ref/ita2
30. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#conn_line
31. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#conn_data
32. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#conn_ext
33. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/090/full.jpg
34. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_speech
35. https://www.cryptomuseum.com/spy/owvl/32620/opr.htm
36. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#doc_1
37. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#conn_line
38. https://www.cryptomuseum.com/radio/morse/index.htm
39. https://www.cryptomuseum.com/radio/morse/index.htm
40. https://www.cryptomuseum.com/telex
41. https://www.cryptomuseum.com/ref/ita2/index.htm
42. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_8
43. https://www.cryptomuseum.com/spy/owvl/examples.htm
44. https://www.cryptomuseum.com/spy/owvl/32620/files/Deutsch.wav
45. https://www.cryptomuseum.com/spy/owvl/32620/files/Deutsch.wav
46. https://www.cryptomuseum.com/spy/owvl/32620/files/Spanisch.wav
47. https://www.cryptomuseum.com/spy/owvl/32620/files/Spanisch.wav
48. https://www.cryptomuseum.com/spy/owvl/32620/files/English_Poland.wav
49. https://www.cryptomuseum.com/spy/owvl/32620/files/English_Poland.wav
50. https://www.cryptomuseum.com/spy/owvl/files/G06_20140425_1930_5442kHz.mp3
51. https://www.cryptomuseum.com/spy/owvl/files/G06_20140425_1930_5442kHz.mp3
52. https://www.cryptomuseum.com/spy/owvl/examples.htm
53. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#eprom
54. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#voice
55. https://www.cryptomuseum.com/spy/ddr.htm
56. https://www.cryptomuseum.com/spy/owvl/32620/32621.htm
57. mailto:[email protected]
58. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/index.htm
59. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_4
60. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/index.htm
61. https://www.cryptomuseum.com/spy/ddr.htm
62. https://www.cryptomuseum.com/intel/stasi
63. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_4
64. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/files/sprecherin.pdf
65. https://www.cryptomuseum.com/radio/morse/index.htm
66. https://www.cryptomuseum.com/spy/owvl/32620/files/Deutsch.wav
67. https://www.cryptomuseum.com/spy/owvl/32620/opr.htm
68. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#doc_1
69. https://www.cryptomuseum.com/radio/morse/index.htm
70. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#doc_1
71. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/index.htm
72. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/index.htm
73. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_6
74. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_2
75. https://www.youtube.com/embed/9MY8HblDAHQ
76. https://www.youtube.com/embed/TP-gZ7PgAK8
77. https://www.youtube.com/embed/ocWASywcsAU
78. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_psu
79. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_psu
80. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#firmware
81. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_relay
82. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_audio
83. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_front
84. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_audio
85. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_speech
86. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/089/full.jpg
87. https://en.wikipedia.org/wiki/U880
88. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/059/full.jpg
89. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_psu
90. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_9
91. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_exp
92. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/112/full.jpg
93. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_audio
94. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_relay
95. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/101/full.jpg
96. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/090/full.jpg
97. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/089/full.jpg
98. https://www.cryptomuseum.com/spy/owvl/32620/speech.htm
99. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/118/full.jpg
100. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/120/full.jpg
101. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_1
102. https://www.cryptomuseum.com/spy/owvl/32620/opr.htm#errors
103. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_speech
104. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#doc_3
105. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/058/full.jpg
106. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/060/full.jpg
107. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/066/full.jpg
108. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/065/full.jpg
109. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/075/full.jpg
110. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/081/full.jpg
111. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/082/full.jpg
112. https://www.cryptomuseum.com/spy/ddr.htm
113. https://www.cryptomuseum.com/spy/ddr.htm
114. https://www.cryptomuseum.com/radio/morse/index.htm
115. https://www.cryptomuseum.com/spy/owvl/32620/speech.htm
116. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#pcb_psu
117. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#conn_line
118. https://www.cryptomuseum.com/spy/owvl/32620/speech.htm
119. https://www.cryptomuseum.com/manuf/rft/index.htm
120. https://www.cryptomuseum.com/ref/ita2
121. https://www.cryptomuseum.com/intel/stasi/index.htm#nr
122. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/089/full.jpg
123. mailto:[email protected]
124. https://www.cryptomuseum.com/spy/owvl/32620/eprom/32620_DE_new.zip
125. https://www.cryptomuseum.com/spy/owvl/32620/eprom/32620_DE.zip
126. https://www.cryptomuseum.com/spy/owvl/32620/eprom/32620_ES.zip
127. https://www.cryptomuseum.com/spy/owvl/32620/eprom/32620_EN_Poland.zip
128. https://www.cryptomuseum.com/spy/owvl/32620/eprom/32620_2_CPU.bin
129. https://www.cryptomuseum.com/spy/owvl/32620/eprom/32620_display.bin
130. https://www.cryptomuseum.com/spy/owvl/32620/files/2764.pdf
131. https://www.cryptomuseum.com/spy/owvl/32620/files/UPD446_NEC.pdf/
132. https://www.cryptomuseum.com/spy/owvl/32620/files/RK_20111200_26_31.pdf
133. https://www.cryptomuseum.com/spy/owvl/32620/files/MfS_OTS_4061a.pdf
134. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#doc_3
135. https://www.cryptomuseum.com/intel/stasi
136. https://www.cryptomuseum.com/spy/owvl/32620/files/MfS_OTS_4060a.pdf
137. https://www.cryptomuseum.com/spy/owvl/32620/files/MfS_OTS_4061.pdf
138. https://www.cryptomuseum.com/spy/owvl/32620/32621.htm
139. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_7
140. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_2
141. https://www.cryptomuseum.com/spy/owvl/32620/files/fertigung_1989.pdf
142. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/files/sprecherin.pdf
143. http://www.bstu.de/EN
144. https://www.youtube.com/user/PeterStaal01
145. https://www.youtube.com/channel/UCh5cbydMJKPWKPNQ4gUu-zA
146. https://www.cryptomuseum.com/spy/owvl/examples.htm
147. https://en.wikipedia.org/wiki/U880
148. https://www.cryptomuseum.com/spy/glossary.htm#ddr
149. https://www.cryptomuseum.com/spy/glossary.htm#mfs
150. https://www.cryptomuseum.com/spy/glossary.htm#ddr
151. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_5
152. https://www.cryptomuseum.com/spy/owvl/32620/index.htm#ref_2
153. https://www.cryptomuseum.com/spy/owvl/32620/opr.htm
154. https://www.cryptomuseum.com/spy/owvl/32620/speech.htm
155. https://www.cryptomuseum.com/spy/owvl/32620/32621.htm
156. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/index.htm
157. https://www.cryptomuseum.com/spy/owvl/index.htm
158. https://www.cryptomuseum.com/radio/morse
159. https://www.cryptomuseum.com/intel/stasi/index.htm
160. https://www.cryptomuseum.com/spy/owvl/examples.htm
161. https://www.cryptomuseum.com/spy/ddr.htm
162. http://www.cryptomuseum.com/donate.htm
163. https://www.cryptomuseum.com/index.htm

Hidden links:
165. https://www.cryptomuseum.com/spy/owvl/index.htm
166. https://www.cryptomuseum.com/spy/ddr.htm
167. https://www.cryptomuseum.com/intel/stasi
168. https://www.cryptomuseum.com/spy/owvl/32620/32621.htm
169. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/index.htm
170. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/075/full.jpg
171. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/075/full.jpg
172. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/088/full.jpg
173. https://www.cryptomuseum.com/spy/owvl/schnatterinchen/index.htm
174. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/059/full.jpg
175. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/053/full.jpg
176. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/093/full.jpg
177. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/052/full.jpg
178. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/067/full.jpg
179. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/061/full.jpg
180. https://www.cryptomuseum.com/spy/owvl/32620/speech.htm
181. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/027/full.jpg
182. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/121/full.jpg
183. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/078/full.jpg
184. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/064/full.jpg
185. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/086/full.jpg
186. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/094/full.jpg
187. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/103/full.jpg
188. https://www.cryptomuseum.com/spy/owvl/32620/img/302685/126/full.jpg