"Programmer Electronic Control"

PartNo. 51-019-02, NSN 1680-99-652-3410,
Supplier K0656, Marconi Avionics, UK

Alternate designation (unsure!) NSN 5865-99-977-8365, Part No. 51-048-02

(Restoration of a vintage rugged computer from the Tornado aircraft)

- The complete Story in pictures, by Erik Baigar, www.baigar.de -


28.2.2016: Updated "Wanted Items" (XLS, V1.5), added pictures of paper tape cassettes.
15.7.2015: Additional information (Index, references and part. nos.) to the RPMD-
and FIN demo video on YouTube - HighRes version in preparation.
21.6.2015: Some more pictures added to the VCFe section and efforts regarding
CVR and RPMD documented - including a 15 min video.
5.5.2014: Another update: VCFe documents now contain the feedback I got.
25.4.2014: Big update with many new pictures and information. Update to the
wanted items lists. Added picture of current setup.
25.9.2012: More pictures and updated logbook with stuff related to
work on WFG1, PEC-OMP and Rolm1602.


  1. Results of the reverse engineering efforts
  2. Logbook listing the major steps
  3. Roots of the unit / architecture
  4. Suspected original use
  5. Emulator for the "big brother"
  6. External information
  7. Items Wanted
  9. Picture "gallery"
  10. Older history

1. Result of the reverse engineering efforts from 2004 until today:

Command reference of the "Programmer Electronic Control"

as I deciphered and named the commands. This contains lots of technical information,
timings, pin-outs and much more. Current status: The 12-bit processor is fully
operational - even interrupts and the IO system are working now. A "hello world"
is perfectly running on an attached LCD display and the unit can control a
CalComp M84 pen plotter.

Photo Suite of all the printed circuit boards of the unit:

(1) Driver Board, 1680-99-646-6754; (2) Data Board, 1680-99-646-6755; (3) Core Memory, 5841-99-652-3386;
(4) Driver Board, 1680-99-646-6754; (5) Control Board, 1680-99-646-6753; (6) Data Register, 229-013909;
(7) Data Register, 229-013909; (8) Control Register, 229-013551; (9) Function Decode, 229-013549;
(10) Processor Timing, 229-013547; (11) RxTx Interface, 229-013545; (12) Serial Parallel Converter, 229-016304;
(13) Decode and Interrupt, 229-013905.

The unit consists of 15 boards of standard size 100mm*160mm, containing a total of 497,
mainly standard mil-spec TTL chips. All of them are identified, even the exotic four
custom ones and data-sheets are available. Here is a

Collection of technical information

on all chips used in the PEC's processor including statistics of the date codes.

The next milestones in my hobby is to finish the blinkenlights for the Programmer Electronic Control:
Paper tape, teletype simulation, word generator and register display are working and SAP already runs
nicely. Missing is control of single stepping, run/stop and memory access via the PEC-OMP
(PEC-Operators Monitor Panel).

Current (4/2014) view of the setup with the original vintage panel from Tornado connected

2. The Chronology of the project...

...starting in 2004 is a longer story. Thus the complete diary is located on a seperate page, listing all major steps
and achievements during the years of reverse engineering: TimeLine. This page contains and explians
many of the pictures shown in the gallery below. The latest achievements from this logbook are the following:

4/20/2013 The analysis of the WFG1 is completed and control of all elements via the Panavia link is possible now (3 circles, 20 lines, tabular characters, random characters in two sizes and the grid parallel on either display 1 or 2). The initial fear that there may be something wrong with the WFG was eliminated by testing a second WFG which Simon Green from Hayward and Green Aviation sent me on 3/10/2013. I just had not fully understood how lines are generated and there was a bad solder joint in my setup.
Many many thanks for this help to Simon and hopefully the Bavarian Weissbier tasted good ;-)
The next project in this line is the analysis of the TV-Tabs to connect them to the WFG ... to be started on the next weekend with bad weather.

Short Video
showing characters, grid and
circles in action!

10/14/2013 Terry Froggatt sent me a new program to run on the PEC!
There is a prehistory to this: After I ported Terrys and Dons simulator for the 18 bit Elliotts to modern gnat Ada and made this public, Terry told me that he wrote a BASIC interpreter for the 920 decades ago. He donated me a version of this interpreter to be run within the 920 simulator by end of 2012 (many thanks!).
This made me very happy and therefor I ported a vintage game (Tic Tac Toe from the well known book "101 Computer Games") to this BASIC in March. Having sent this over to Terry he ran it on the original machine which was way slower than in the simulator and requires minutes to play ONE game of Tic Tac Toe.
So Terry ported the game to the 920's 18 bit assembler (called SIR) and to 12 bit SAP, which is somewhat different. Of course he had no hardware to test the 12 bit version, and I was deeply impressed that it worked perfectly on the original hardware in the second attempt - precisely on the afternoon of 10/20/2013.
Many thanks and high esteem for this achievement - a new and useful piece of software written in assembler for a 50+ year old architecture indeed is a rarity!

6 min video:

Sorry, it's not a good
video, but it pays tribute
to Terry! Thanks!

4/9/2014 My automated eBay search sent me an alarm as suspicious PCBs showed up. They looked very similar to the ones I know from PEC, although they are not completely identical. I bid on some of them ond contacted the seller: He actually sold me the complete box for a reasonable price and this is how I got hands on 6605-99-525-8290, "DIGITAL COMPUTER UNIT" containing the following 12 PCBs: 6605-99-529-2339, 6605-99-529-2338, 6605-99-529-2323, 6605-99-529-2323, 6605-99-529-2324, 6605-99-529-2337, 6605-99-529-2336, 6605-99-529-2336, 6605-99-529-2335, 6605-99-529-2322, 6605-99-529-2334, 6605-99-529-9118. Unlike PEC the DCU uses software stored in ROM and has semiconductor RAM. Therefor this unit is not freely rpgrammable. From an expert I got the information that the box was used on the NCS1 gyro compass system. It is indeed an other variant of the 12/12 processor and by 2014 some are still in use. Two great finds (1) a different 12/12 and (2) the 12 bit Elliott 900 series is still alive around 54 years after the first 900 machine was built! [NCS1-DCU-1.JPG] [NCS1-DCU-2.JPG]
[NCS1-DCU-3.JPG] [NCS1-DCU-PCBs.jpg]
12/12 (NCS):    12/12 (PEC):
[NCS1-Unit-TimingPCB.jpg] [TornadoUnit-Timing.jpg]
5/3-4/2014 Participation in the Vintage Comuter Festival Europe (VCFe 15.0) in Munich with poster and a talk.
As preparation the homebrew tiny operating system for PEC got some updates and the code was cleaned up. An up-time clock with improved timer handling is added (the timer hardware within PEC really is a bitch) and the AECM panel can be used to start the user processes (currently just one using the plotter to plot a demo graphics). Version of the trivial operating system now is 1.11!
But most important, all equipment survived the transfer to the festival and the two days of demonstration: PEC (Serial 129), Rolm 1602 (Serial 235) and Rolm MSE/14 (Serial 130). The exhibition was awarded the third price by the visitor's election at the end of the festival.
pec-tos V1.11

[AECM-Connected.jpg] [AECM-Connected2.jpg]
[AECM-LampTest.jpg] [AECM-Panel-in-Action-20140309.jpg]
[TornadoCockpit-AECM-Marked.png] [VCFe15.0-CoreOnRolmModule.jpg]
[VCFe15.0-Exhibition.jpg] [VCFe15.0-Explaining.jpg]
[VCFe15.0-PEC1.jpg] [VCFe15.0-PEC2.jpg]
[VCFe15.0-PEC-TOS-Demo.jpg] [VCFe15.0-Talk.jpg]
[VCFe-Exhibition1.jpg] [VCFe-Exhibition2.jpg]

9/17/2014 During all past experiments it was always a challenge to get enough 400Hz 115VAC power for the various devices to play with. My home-brew sinus inverter is maxed out at 100W and even less if the load is not a purely ohmic one.
Today the new 1500W power inverter is completed and operated one of the TV/Tab displays and the WFG simultaneously. It consists of a standard PWM inverter as for example used in metal working machines followed by a sinus filter and an isolation transformer to give 115VAC single phase, 115VAC three phase in star configuration or 208V three phase into a triangle. The transformer was custom bade by the Tauscher company to my own specification. The new inverter also supplies 28V essential DC needed by some units.
Last but not least the very nice wooden housing was a birthday present from my father-in-law: Many thanks therefore!
I took advantage of the situation to harmonize my 400 Hz connections: All devices use the same AB05 plug as used on PEC now, so all inverters/supplies can be interchanged now only one type of extension cable is necessary.
[Inverter1500-Testing.jpg] [Inverter1500-TopView.jpg]
[TVtab-Test20141015.jpg] [Inverter1500-Housing1.jpg]
1/20/2015 On eBay I hunted a cockpit voice recorder (CVR, PartNo. 125250-3, NSN 5835-21-881-9325) from the early tornado. These are tape drives using standard music cassette to record audio from both pilots. An additional function was that the mission data (way points etc.) prepared in advance had been fed from this unit into the main computer - a function called data entry. Studying the recorder is complete and I can record and replay audio data now: The track format of the tape is rather strange as both sides of the tape are used simultaneously, i.e. the tapes cannot be flipped as usual audio cassettes. Additionally in data entry mode the tape runs at twice the recording speed replaying a complete C-60 tape in around 15 minutes.

One of the gearing mechanisms was completely destroyed so restoring this unit was a funny job and I recycled gears from a model locomotive to restore the recorder. It will be a nice "mass" storage to be added to the PEC later...

A video on YouTube (time reference 2:13-3:10) shows, how the CVR of the early Tornado is used to transfer way-point data from the briefing room into the memory of Tornado's main computer. It is really amazing that automatic low level flight below 300ft was safely possible using the 1970ties navigation suite and the terrain following radar system (look at the e-scope showing the radar data from the terrain following system at 5:20 min on YouTube).

[Leigh2.jpg] [LeighCVR.jpg]
[LeighHead.jpg] [LeighLaufwerk.jpg]
[LeighMotors-Ritzel.JPG] [LeighRitzelvergleich.JPG]
[LeighType.jpg] [Leigh-VCRwithTape.JPG]
[MotorPutt.JPG] [RitzelPutt.JPG]
5/12/2015 After rigorous analysis of the RPMD display (Repeated Projected Map Disply, Part. No. 3892/75500/02/010, NSN5826-99-5731589) from Tornado's front cockpit I designed an additional PCB for the FIN logger capable to drive the display and read the switches etc. Analysis of a test film with some maps, supplied kindly (many thanks!) by Mr. Hans Kiening, led to a mapper function correlating film coordinates to latitude, longitude and scale. All this is now programmed into the logger device with some other goodies to give a rather complete navigation subsystem with the following features:

  • Reading the INS or LINS at 3 Hz minimum
  • Internal GPS and micro mechanic IMU for reference
  • Logging to SD card
  • Driving the RPMD online, in demo mode or showing cities selected from a list
  • HUD view mode using data from the INS with over 20 Hz update rate
  • Bluetooth output for external map software or input for debugging
  • Auxilary synchro output for connecting a directional indicator
  • RS232 port for connection a map plotter

Since this project is rather complete now, with the logger consisting of three home-brew PCBs, there is a movie (at the moment just low resolution version on YouTube) showing all the stuff in action. Things to do are building a nice housing and testing the whole system on board an aircraft ;-)

Components seen in the video are the Ferranti Intertial Navigator FIN-1010 or FIN-1012 with part numbers 3854/37012, 3854/36001 or 3854/37010. There exist various different control and display units (CDUs), which can handle different configurations - I have seen these on eBay: For one navigator (INCDU, Ferranti 3854/36701/01/003), two navigators (DINCDU, Ferranti 3854/78001/01/002) or for two of the later LINSs (DINCDU, Ferranti 3854/78501/01/001) - all of them work also with one or two "old style" navigators. The RPMD is also from Ferranti, NSN 5826-99-573-1589 or 6610-99-787-8922 and equivalent part number 3892/75500-02-010.

Index of the FIN-RPMD-Explorer YouTube-movie:
  00:00 Intro
  00:39 How intertial navigation works
  01:20 Uses of the Ferranti gimballedf platform
  01:40 Spotlight on the RPMD
  02:10 How map films have been made
  02:50 Internals of the RPMD
  04:20 Focus on the FIN101x
  04:55 Platform in action: Gimbal flip
  05:30 The homebrew logger explained
  08:31 Starting the laser based INS
  09:51 Turning on the RPMD display
  11:00 RPMD controlled by the inertial navigator
  11:40 Supersonic flight over Germany
  13:00 Additional features of the logger setup

Additional reference: If you have got a working FIN or LINS and a CDU and you are crazy enough to have the desire firing them up, I have my pinout of a basic cable to connect the devices (No warranty for the cable working for your hardware!!).
This shows the RPMD of a German IDS during a very low level flight in Labrador at time 3:28-3:36. Even within a narrow valley, low level flying was practiced where I do not know whether this footage (after 3:00) was taken during automatic flight via terrain following radar and FIN or whether it was manual flight. In any case it is amazing that automatic low level flight below 300ft was safely possible by the FIN and the terrain following radar system (see e-scope radar image for example at 5:20 in this movie).

Thanks to the other FINners (Alf, Klaus and Florian) for the regular FINners (i.e. dinner with FIN related activity), the discussion and the cool joint project.

Now I have finally to repair one of my two defective FIN1010/FIN1012s, NSN 6605-99-251-6563 or 6605-99-795-0104 - but this will be the most challenging project for a long time due to their enormous complexity.

[RPMD-Display.jpg] [RPMD-Display-Type.jpg]
[Logger1a.jpg] [Logger1b.jpg]
[Logger2.jpg] [Logger3.jpg]
[RPMD-Analysis-Development.jpg] [AUX-Synchro.jpg]
[HUD-Mode.jpg] [LINS-RPMD-Logger-Setup.jpg]

3. What are the roots of the unit / architecture...

Talking to experts involved with the computer company Elliott (later GEC-Marconi, Marconi Avionics
and today Selex SAS), based in the UK, it was possible to identify the box by comparison of the command set:

The "Programmer Electronic Control" similar to the 12/12 from Elliott.

This is a downsized 12-bit variant of the bigger 18-bit machines of the Elliott 900
series, delivered beginning in 1965. For information on these (e.g. the 920), look at the
"Our Computer Heritage" project of the Computer Conservation Society documenting
British computers.

The following documents have been carefully preserved for over 30 years by
Terry Froggatt and I am really happy that he shared them with me: The PEC's cousin,
the Elliott 12-12 computer, was used in various applications starting in the
1970ties and some may still be online today! One example of it's use is the auto-
throttle computer of the Boeing 747-100. Look at the flyer and the specification
of the Elliott 12-12 from around 1973:


The 12-12 essentially is a repacked version of the deskside Elliott 902,
which was optimized for size, power consumption and the other needs of
airborne computing. Following are a picture and the detailed command
description of the "full size" Elliott 902:

902 Facts Card

The following pictures show the early (6/2008) setup of the Programmer
Electronic Control on my bench with and without explanations. In the last
picture you can see an original paper tape (dated 1/10/1970) sitting on
a PCB of the PEC. I got this from Terry Froggatt, too and it contains the ORIGINAL
assembler for the Elliott 902 called SAP or "Symbolic Assembler Program".

with explanations with explanations IRQ bridged

On 5/3/2014 on the VCFe 15.0 in Munich I introduced the Elliott-900 series in a 45min talk to
the audience and an exhibition compared the US made Rolm MIL-SPEC series based on the
Data General architecture to the Elliott 900 (Sorry, German language only!).

Poster -> _ _ VCFe 15.0 _ _ <- Slides

4. Suspected original use of the unit...

Avionics specialists suspect that the Programmer Electronic Control was part of the
first models of Tornado ADV's Foxhunter AI24 radar set. According to the timeline, the PEC
might have been used in Stage1 and before and thus probably was retired in 1991.

There must have been "core store loaders" for in field programming of the units
and "operator data panels" (blinkenlights) for service. But my fear is, that documentation
and all other arefacts are long gone...

Any information, hardware, hints, pictures and discussion is absolutely welcome,
please contact me at erik@baigar.de.

5. Emulator for the "big brother" of the PEC...

Software development for the 12-bit Elliott machines was often done on the bigger
18-bit machines (903, 920,...). For these Elliott 900 series of computers there
is a fascinating emulator initially written in 1983 by Terry Froggatt to run on VAX and
later on DOS using Meridian Ada. Afterwards it has been slightly modified and improved by
Don Hunter, who fixed a bug and added support for the plotter and many examples for
the included Elliott Algol compiler. The DOS version (with and without plotter
support, source, manuals and with lot of examples) can be found on Don Hunter's page
as a zip-file.

Since I wanted to learn more on Ada, the Elliott 900 and since I love my SGI/IRIX boxes, I recently
ported this great emulator to gnat using GtkAda for the plotter emulation. This one runs on UNIX
operating systems (Sun, SGI) and on Windows 2000 or later. No Installation required!

Starting the emualtor, the mission of Apollo8 around the moon is simulated. This
example for the Algol compiler must be from around 1964. The starting parameters of
the mission can be modified by editing the file ElliottIn.dat with an arbitrary text
editor. The first numbers on the last line in this file are starting height and speed.
Changing e.g. height from 300km to 305km you will observe a disaster happening at the end.

Keep in mind, that the Sim900al-NT runs many times faster on a decent PC or workstation
than on the original Elliott 903 or 920.

Download the latest version 1.3 of the emulator here, now containing all of Don's Algol examples,
the source code and two utilities (one for converting paper tapes from 903 telecode to ASCII and
another to view the headers of tapes - thanks again to Terry):

Architecture/OS Version/Distri/HDD Comment Link
MIPS/IRIX 1.3/3M5/12M7 UNIX-Versions: Extract the tarball, cd to the generated directory and execute the bash script Sim900al-NT. This script will set the required environment variables and launch the architecture dependent binary afterwards. Read file readme.1st. DOWNLOAD

SPARC/Solaris 1.3/5M8/19M0 DOWNLOAD
x86/Windows 1.3/1M6/4M8 Extract the zip file and directly start the Sim900al-NT.exe to launch the simulator. For more information read the file readme.1st.txt. DOWNLOAD

Currently Peter Onion, who is working on the restoration of a 903 and who already wrote an
emulator for the 800 series Elliott computers (bit serial machines), is thinking about writing a new
simulator with fancy graphics and real-time behaviour for the linux platform. Visit his page here:


6. External information...

...For more detailed information, please look at the following threads on the usenet or follow the links given:

And some related information/threads:


...to the people who contributed by answering to my questions in the above mentioned threads, by supplying information or just by listening or being interested in this project! Special Thanks to the following great individuals: Terry, Chris, Don, Peter, Adrian, Frederic, Rod, Roger, Christopher, Simon, Alf, Tony, Kevin, Brian, Ian, Benjamin. But the journey is not yet finished, thus...

9. Items/Information wanted...

During my work on the PEC, apart from reverse engineering, I did a lot of research on the "origin" of this unit
and the applications similar computers probably have been used. Here searches on the Internet and reading
many books and watching available DVDs on Tornado and Nimrod where very helpful. Additionally I did
research (either by inquiry or in persona during one of my visits in the UK) at various UK based Museums
(e.g. RAF Museums in London and Cosford, FASTA  in Farnborough, Rochester Avionics Archives (RAA),
Science Museum in London and last but not least MOSI  Manchester).

The result are some parts with NSNs and/or part numbers I'd be interested in. If you have any of those or if you are
interested in discussion and/or have any information on those than please feel free to contact me at erik@baigar.de!

Download list as XLS-File1.5!        (Old Versions 1.0, 1.1, 1.2, 1.3, 1.4)

Programs have been loaded onto early Elliott computers using paper tape. For this purpose an unit called "Program Loading Unit" (abbreviated PLU) existed where the paper tape itself was enclosed in cassettes. This type of  loading facility was used in various applications, e.g. the early fire control system  FACE  on board the FV432 tank. 

So wanted is one of the following NSNs: 7025-99-574-1264, 7010-99-809-3675 or 1290-99-961-6841 (Part numbers FV860118, MDSD76-66 or FV 2188706).

The cassette with the paper tape shown on the right may also belong to the GPLU (below). These images can be downloaded and magnified.

Later on, an improved version of this box, which still was paper tape based, replaced the PLU allowing many different machines (12 and 18 bit) to be booted - even those machines which did not have a boot loader installed (called initial instructions). PEC is of this type! Due to this versatility this box was entitled "Program Loading And Interface Equipment" alias PLAICE. Although this is the most wanted item I unfortunately do not have a picture of this unit, but it should be according to reference number  T(F)M/187 dated somewhere in 1975 and likely NSNs are 1290-99-225-4526 or 1290-99-826-9627 (Ref. Nos. FV860118 or 2-33-0-201).
Unfortunately I do not have got any pictures, but it probably used paper tape cassettes as the PLU above!
Later on (in the 1980ties?) as many of the core memory based processors have been replaced by microprocessor based designs, a successor called "Ground Program Loading Unit" or GPLU entered service and which was based on magnetic tape holding several mega words of code in contrast to the several 10 kilo words of the earlier paper tape based units. Even these are most likely not in service anymore and might have had NSN 6625-99-790-0760.

I am not sure whether this one can boot the PEC, but a tiny chance might exist...

More current loading units of course use flash memory (e.g. as  this one used on the now scrapped Nimrods) or consist of a simple notebook.

The bigger brother of PEC, being an embeeded 18 bit Elliott architecture machine is the 920M, which was widely used in the UK throughout the 1970ties in land, sea and airborne applications (e.g. the Jaguar) and it even was in space onboard the Blue Streak and Europa rockets, where it acted as guidance computer.

One variant of this machine is known via NSN 7440-99-111-8581 and the Rochester Avionics Archives  hold several of these toys (part number something like MCS.920 or 920M).

Around 1976, the technology in semiconductors had advanced significantly, so the successor of the 920M, which was based on DTL chips, was released and called the 920ATC (Advanced Technology Computer). It still had core memory to ensure long data and program retention times. Although I do not know any part numbers or NSNs, one of these would be a highly welcome item!

9. Various pictures related to the "Programmer Electronic Control"
and their reverse-engineering (chronological, click to enlarge):

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2443 x 1402
184930 bytes
1600 x 988
514924 bytes
2757 x 1538
316222 bytes
1280 x 901
189191 bytes
1189 x 845
132554 bytes
800 x 688
492833 bytes
1600 x 1711
192271 bytes
1280 x 1231
44473 bytes
886 x 436
100088 bytes
1222 x 804
37276 bytes
862 x 310
170717 bytes
1038 x 921
136173 bytes
1026 x 814
69927 bytes
610 x 404
38580 bytes
729 x 289
260913 bytes
1024 x 895
166789 bytes
1280 x 1019
58222 bytes
333 x 270
549704 bytes
3134 x 2715
443849 bytes
2484 x 2220
524353 bytes
1600 x 1328
385363 bytes
1600 x 1430
352744 bytes
1600 x 1444
356178 bytes
1600 x 1476
1048450 bytes
2200 x 3066
108566 bytes
1280 x 739
115782 bytes
1080 x 994
596986 bytes
3000 x 1278

10. Older history:

26.1.2012: Addition of a "wanted" section listing and explaining
items and information I am looking for (also XLS available).
23.6.2011: Documentation of the progress of the last 4 months: PEC-Sound,
update of the vintage computing and avionics logbook with lot of information
and extension of the PEC picture gallery.
2.6.2011: Smaller release: Version 1.3, with minor change in handling the terminate interrupt
instruction, of the Simulator released (can now run the 12bit simulator within
the 18bit simulator).
12.2.2011: PEC: New version 1.2 of the Simulator for 18 bit Elliott machines released.
Tornado Engine Computer donated to the Deutsches Museum in Munich (TimeLine).
12.12.2010: PEC: Added latest achievements to the Time-Line - included are a short video of the
BlinkenLights, ideas what the panel will look like and an outlook on WFG1.
30.05.2010: Added info on the inverter, the UK-Trip and latest achievements with the new PEC setup.
30.01.2010: Added first blinkenlights related information and pictures of the newly acquired waveform
generator from the early versions of Tornado.
13.12.2009: Latest achievements added to the Time-Line and supplied the "gallery" with new pictures.
6.7.2009: Checked all pages for dead links and removed them; added diary to the "PEC-page.
6.6.2009: Added pictures of latest milestones - plotter is running under control of PEC now.
Pictures sorted chronologically. Added index.
31.3.2009: Added counter and some explanations to the documents from Terry Froggatt.
8.6.2008: Added technical information on all chips, used on the unit together
with date code statistics. Added picture of 902, too.
4.5.2008: Added NSNs, Part-numbers and pdf with pictures of all PCBs.
29.4.2008: Added Elliott 900 series emulator (Thanks to Terry Froggatt & Don Hunter).
28.4.2008: News: The unit is said to be part of the early Foxhunter Ai24 radar
of the Tornado ADV aircraft.
28.2.2008: Added some links (picture 903, time-line).
19.1.2008: Added pdf containing all secrets I prayed out of the box,
box identified as an Elliott 12/12. Probably NOT from Tornado.
5.1.2008: Added pdf files of the relevant threads in newsgroups etc.
7.11.2007: Update with new pictures (Starting with _), including new unit.
15.9.2007: Got second of the units, serial number 129. Both units show same
behavior in all respects. New unit has maintenance sheet attached,
thus assumption is: Both units are OK. ;-)
17.6.2008: Now ALL (even the custom ones) chips in the PEC are identified, thus there
is an updated version of the Reference-Page with pin-outs.
15.6.2008: Added additional Foxhunter picture, both now available in better
resolution. Uploaded new documents about 12/12 and 902 but not
properly included yet - sorry.

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