"Programmer Electronic Control"

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

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

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

News/History

25.9.2012: More pictures and updated logbook with stuff related to
work on WFG1, PEC-OMP and Rolm1602.
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).

Contents...

Results of the reverse engineering efforts

Logbook listing the major steps

Roots of the unit / architecture

Suspected original use

Emulator for the "big brother"

External information

Items Wanted

MANY THANKS

Picture "gallery"

Older history

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

Command reference of the "Programmer Electronic Control"

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

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

6/23/2011	Speaker attached to the PEC-Panel (Yes, computers of those days always had a speaker to hear what is going on and allowing trained technicians to hear what the problem is) and implemented code in one of the CPLDs to convert PEC's memory transfer signal to an audible signal sounding similar to Terry's 920 whose sound I recorded during my visit in 2010. Here is a recording from today what PEC sounds like in compiling software: For the first fraction of a second (0.0s-0.9s) you hear background noise of the SparcStation and me pressing the Enter key. This makes the first/old Transputer writing the inital instructions into PEC (0.9s-1.2s) and launching them. Now PEC starts loading the assembler (aka SAP, the Symbolic Assembler Program) from the virtual paper tape being simulated by the second Transputer within the new BlinkenLights (finished at 4.3s) which is automatically started afterwards. The assembler now waits until the operator places the first source tape into the reader (of course in my setup the BlinkenLights Transputer does this automatically) and acknowledges this by toggling key 11 on the word generator. This waiting leads to a regular sound (4.3s-5.8s) until I manually toggled the switch on the panel. From than on, PEC reads the source tape for the first pass until the very end of the recording. To compile larger software the operator would have to feed in all source tapes one by one acknowledging each by toggling key 11. After this, all tapes have to be fed in again in the same order for the second pass during which the binary is simultaenously written to the punch. This binary tape usually contains a loader and thus can be loaded via the initial instructions as was the assembler before. On the rear side of the PEC-Panel, one can see the new Transputer (top-left) with the selfmade CPLD interface which will finally take all functions from the old Transputer PCB (Lower-right PCB shown here). But for the time being, both Transputers are needed - but this poses no problem at all. The mainboard with the bunch of PCBs plugged in is the interface which connects the Transputer to PEC via Altera CPLDs (MAX7192SQC-15 and -7) and which is doing the hard real-time stuff.
10/22/2011	Started reverse engineering of the WFG1, the graphics generator driving the two CRT displays in the rear cockpit of the early Tornado aircraft. Probably the German birds still use those? The setup consists of a sparc station 20 connected to a CPLD via a printer port SPI link. The CPLD is programmed to generate the bit-serial, differential data words sent to the wave form generator. Several wires are connected to the guts of the WFG1 monitor the incoming signals and the resulting internal activity within the circuitry. Upon sending random datagrams there is lot of activity (not only electronic signals, but also on modified TV monitor connected to the output). Internally to the waveform generator are several subunits, several euro card size PCBs each, being responsible for characters, circles, lines and tables. But there is NO DISPLAY memory, i.e. all graphical elements are computed as the electron beam moves across the screen! It will be fun to figure out the "language" the engine of the waveform generator will understand to generate meaningful output!
12/10/2011	Finalized the design of a housing for PEC-OMP (PEC-Operator and Monitor Panel) using CAD system Pro/E: The housing will consist of two parts: A lower one taking a 500W inverter built around a motor AC drive followed by a homebrew sine filter. The upper part will take the panel, Transputer and interface electronics and will be protected by a glass cover. Now search for a carpenter willing to make the cabinet from my drawings will start (This will not be easy as I need only one unit and they all have plenty of work).
12/17/2012	First success on deciphering the WFG1's language: After some painstaking experiments and analysis of the WFG's reaction to bombardment with random bit patterns it now is obvious that there are 5 command groups and one of the groups drives the text engine. 64 different characters can be displayed simultaneously on the two screens and one 32 bit command is able to write 3 successive characters onto the screen. 8 bits are used per character, but only 6 bits encode the character whereas 2 encode the attributes "size" and "reverse". The trains of characters can be placed arbitrarily onto the screen by giving line and row numbers, where the next train is to be placed. The waveform generator has got a busy output, but text is processed immediately and thus characters can be moved around in breathtaking speed!
6/12/2012	In March there has been a big lot of Tornado surplus from the Bundesluftwaffe for auction on VEBEG. Included have been 27 TV/Tab displays (NSN6625-12-186-7800, Cage Code K0 656, Part Number V22.498.85). The electronics dealer against "throw-away-ism", Helmut Singer Elektronik, got the whole lot. In this way I acquired a TV-Tab display which has a NATO list price of more than 33852,64EUR ;-) This display will match the WFG1 perfectly and hopefully the winter will give me more time for reverse engineering its command set...
8/14/2012	The housing of the PEC-OMP was completed by the carpenter and together with my father in law we went to Landsham and picked up the empty PEC-OMP. Mr. Huber from Holz Design Huber really did a great job - Thank you very much!
22/9/2012	Populating the PEC-OMP cabinet with the 400Hz three phase inverter I ran into trouble with 15kHz noise of the PWM inverter being injected into the ground line. The crossfeed is caused by the Y capacitors being part of the EMC protection within PEC's power supply and causes the personal protection switch to interrupt mains. I did not discover this earlier since during pretests an isolation transformer was always used. Another problem is that without galvanic isolation, the sine filtered output is either centered around ground potential (good case) or is "riding" on the phase potential (bad case) depending on the orientation the mains plug is inserted. In the latter case and together with remaining noise from the PWM signal, the isolation of PEC has to withstand 500V to ground which gives me the creeps. After several requests and quotations I ordered a custom made 3 phase isolation transformer to be added to the inverter cabinet hopefully solving both issues within the next 6 weeks.

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

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:

12-12-Specification

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 current (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

The next milestones in my hobby are to build blinkenlights for the Programmer Electronic Control,
paper tape and teletype simulations and to execute this software.

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.

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:

http://www.peteronion.org.uk/TNMOC-903/

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

7. MANY THANKS...

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-File!
 

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).
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).
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).
As I am planning to fit a contemporary display to the PEC, I am also working on reversing the display processor which controlled the back navigator's displays in the early Tornado IDS and ADV aircraft. This box is called "Waveform Generator 1" (WFG1). Since I have only got one of these (purchased via Liquibiz) and I do not know whether it is OK, I'd be interested in a "backup". The CRT two displays driven simultaneously by this box have been able to display simple vector graphics (lines, circles) and obviously some text formats. The box does not have a NSN printed on it so only a Marconi Avionics part number can be given: 51-011-21.
In my current experiments on the above mentioned WFG1 I am using a severely modified CRT monitor and of course I'd love to get hands on one of the original Tv/Tab displays of the Tornado's rear cockpit. Again only a part number is available: V22.498 from K0656.
The Ferranti inertial navigators (FIN1010 and FIN1012) contain a masterpiece of mechanics with the patented Ferranti micro-miniature stabilized platform. But also from a "digital view" these units are exceptional as all platform control and navigational arithmetics including integration to position and great circle calculations are handeled by an archaic bit serial processor consisting of only 3 small PCBs of rather few 54xx TTL gates. To bring this unit back to live, a control panel called "Inertial Navigator Control and Display Unit" (IN-CDU) would be essential.  Since similar systems where used on the early Tornado and also the Nimrod, there are various versions. I found at least two different of them on the internet and in various books. All the part numbers start with 3854/36701 or 3854/37714. NSN might be one of the following: 6605-99-655-3582, 6605-99-780-3249 or 6605-99-300-9713.
Of course if one has surplus PECs or any form of additional information, software or documentation on this small jewel, really everything would be highly appreciated. NSN  1680-99-652-3410 or 5865-99-977-8365 (Part nos. 51-019-02, 51-048-02).
Before the advent of mass storage media and high resolution displays, maps often have been projected from various forms of film. One of these displays using standard 35mm film - again from the Tornado's rear cockpit - is the Ferranti CRPMD ("Combined Radar and Projected Map Display", currently (2012) available at Helmut Singer Elektronik over here in Germany). This box full of mechanics and comprising an analog storage CRT for overlaying the radar picture to the map is a really heavy monster and any information on the guts of this or at least the pinouts of the various plugs would be highly interesting: NSN  5841-99-991-1833 (Part no 3892/72000-02-011 or P089665-301).
Last but not least, the pilot in Tornado had a map display similar to the CRPMD which did not contain the CRT tube and was much smaller. Although the mechanics is very similar the CRPMD, this "Repeated Projected Map Display" (RPMD) is much simpler in construction. Again any information on these units with NSN 5826-99-573-1589 or 6610-99-787-8922 would be welcome! Part numbers: 3892/75500-02-010 or perhaps 3892/79850.

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

p8172677.jpg 37282 bytes 400 x 300	TypePlate.jpg 107919 bytes 644 x 501	Sticker1.jpg 41609 bytes 533 x 378
Sticker2.jpg 72754 bytes 642 x 452	Connectors.jpg 123828 bytes 682 x 511	ModuleRack.JPG 212096 bytes 1280 x 960
Modules.JPG 167486 bytes 1280 x 960	BoxBottomWithOutSupply.jpg 113159 bytes 802 x 602	CorePlaneLeft.jpg 232751 bytes 1026 x 678
CorePlaneRight.jpg 231696 bytes 1079 x 687	DiodeArraysAndCore.jpg 133177 bytes 807 x 627	MemDriverBrd.JPG 260218 bytes 1280 x 960
CoreMemoryEarlyDoku.jpg 358936 bytes 1037 x 1500	ProcessorTiming.JPG 301171 bytes 1280 x 960	PowerSuppSubAssy1.jpg 83507 bytes 642 x 482
PowerSuppSubAssy2.jpg 85468 bytes 642 x 482	SupplyBackplane.jpg 49321 bytes 642 x 482	SupplyWithSubAssembly.jpg 83372 bytes 802 x 602
Screws.jpg 41871 bytes 643 x 640	Switches.jpg 74399 bytes 501 x 420	DeviceUnderTest.jpg 77114 bytes 640 x 480
CoreMemory.jpg 608548 bytes 1614 x 2146	PROMsFunctionDecode.jpg 170548 bytes 1015 x 753	TornadoLanding.jpg 42483 bytes 980 x 705
TornadoComputerUnitSK10.gif 30570 bytes 1227 x 863	TrapuInterface.jpg 167871 bytes 803 x 648	CoreConnectConsole.jpg 139067 bytes 755 x 480
Connection.jpg 106177 bytes 642 x 482	T805RefreshProblem.jpg 50354 bytes 672 x 400	RefreshDetect.jpg 98007 bytes 641 x 409
T805RefreshProblemSolved.jpg 52654 bytes 672 x 400	T805refreshOK.jpg 196688 bytes 1023 x 495	ConsoleLCDonDPL03.jpg 89678 bytes 754 x 888
Ferrit.jpg 50617 bytes 525 x 424	PEC_SingleWrite.jpg 200612 bytes 933 x 616	PanLink1.gif 7004 bytes 672 x 400
PanLink2.gif 9638 bytes 672 x 400	SetUpPanorama.jpg 762277 bytes 4000 x 2011	SetUpPanoramaExplained.jpg 131794 bytes 1280 x 644
920B_Function12_AP112H-0301.gif 715975 bytes 2391 x 1565	_SecondUnit.jpg 72891 bytes 750 x 951	_SecondUnitTypePlate.jpg 139685 bytes 1101 x 785
_View1.jpg 83963 bytes 707 x 764	_View2.jpg 141305 bytes 1053 x 818	_View3.jpg 153753 bytes 1070 x 830
_SecondUnitUnpacked.jpg 116429 bytes 745 x 819	_BackplaneView.jpg 39464 bytes 424 x 439	_CageEmpty.jpg 188995 bytes 1028 x 935
_ConditioningLabel.jpg 77811 bytes 768 x 1024	_CoolantConnector.jpg 55640 bytes 949 x 947	_DifferenceBetweenUnits.jpg 85220 bytes 677 x 717
_ModulesPulled.jpg 161397 bytes 1280 x 960	PEC_TrapuIO20081022.JPG 191083 bytes 1024 x 677	CPLD-EvalPCBonPEC.jpg 395451 bytes 1159 x 1192
Rotary100Winverter.jpg 156666 bytes 1280 x 875	PECversuchInverter20090214a.JPG 356318 bytes 2024 x 955	SolderedPinsPain.jpg 113980 bytes 891 x 897
InsertionRemovalTools-20090306.jpg 127217 bytes 800 x 523	DMCcrimper20090311a.jpg 58218 bytes 640 x 493	EmptyPCBs.jpg 171733 bytes 1280 x 899
FastLink-PCB.jpg 128303 bytes 800 x 600	FastLinkPCB-20090311.jpg 99139 bytes 720 x 550	TrapuLinkPCB-20090310.jpg 125126 bytes 800 x 600
DPL07experiment.jpg 140999 bytes 800 x 706	PlotterSetup.jpg 98629 bytes 819 x 1024	PlotterPECTOS.jpg 80191 bytes 1036 x 656
PlotterOutput.jpg 125914 bytes 1152 x 920	Plotter-HPGL.jpg 58750 bytes 838 x 629	DPL07-Cable-1.jpg 195642 bytes 1024 x 512
DPL07-Cable-2.jpg 129247 bytes 800 x 600	DPL07-Cable-3.jpg 239522 bytes 800 x 943	Facit-N4000-PaperTape.jpg 141239 bytes 640 x 1110
Elliott-SAP.jpg 119303 bytes 1024 x 553	WaveformGenerator-51-011-21.jpg 200856 bytes 1024 x 1313	WaveformGenerator-51-011-21-TypePlate.jpg 95492 bytes 800 x 457
PEC-LED-Line.jpg 330009 bytes 1280 x 960	PEC-LED-Line-Jig.jpg 217426 bytes 1024 x 749	DataMonitoringUnit-Parts.jpg 143448 bytes 800 x 569
3phaseInverter-2010326.jpg 111790 bytes 1253 x 636	3phaseInverter-2010325.jpg 150920 bytes 1194 x 692	Elliott905-Bletchley.jpg 105703 bytes 1280 x 960
TSR2-Cosford.jpg 139247 bytes 1280 x 960	PEC-SetupExplained-20100518.jpg 734835 bytes 1962 x 1517	SAP-on-PEC-20101108.gif 6894 bytes 583 x 295
WFG-TestPattern2.jpg 92262 bytes 800 x 596	WFG-MonitorMOD.jpg 92835 bytes 1036 x 777	PEC-Panel.gif 66279 bytes 848 x 945
PEC-BlinkenLights.jpg 119887 bytes 858 x 820	PEC-BlinkenLightsExplained.jpg 125647 bytes 858 x 820	BlinkenAction.jpg 55374 bytes 633 x 587
PEC-OMP-Panel.jpg 180841 bytes 1195 x 1024	PEC-OMP-Milling.jpg 114969 bytes 691 x 921	PEC-OMP-View.jpg 159880 bytes 1014 x 1024
MECSL-FloatTest-Multiply-12-2.gif 10715 bytes 640 x 480	MECSL-FloatTest-Divide-13-2.gif 10811 bytes 640 x 480	MECSL-FloatTest-QFMATH-Exp.gif 12488 bytes 640 x 480
MECSL-FloatTest-QFMATH-Sqrt.gif 11966 bytes 640 x 480	MECSL-FloatTest-QFMATH-ATan-2.gif 9929 bytes 640 x 480	MECSL-FloatTest-QFMATH-Sin-2.gif 8880 bytes 640 x 480
MECSL-FloatSavage.gif 3754 bytes 640 x 480	MECSL-FloatTest-QFMATH-Ln-1.gif 3241 bytes 640 x 480	MECSL-FloatTest-QFMATH-Ln-2.gif 7392 bytes 640 x 480
MathSavage05.gif 6966 bytes 1024 x 768	MathSavage13.gif 18856 bytes 1024 x 768	MathSavage60.gif 4801 bytes 1024 x 768
MathSavage200Iterations.gif 4244 bytes 1024 x 768	PEC-OMP-Guts.jpg 154055 bytes 768 x 1024	PEC-OMP-1stTest.jpg 83636 bytes 509 x 846
WFG-Abgriffe.jpg 208034 bytes 1280 x 794	WFG-Datagram-Setup.jpg 58649 bytes 800 x 550	WFG-RandomDatagram.jpg 110942 bytes 800 x 579
TV-Tab-1.jpg 100421 bytes 1048 x 1024	PEC-OMP-1.jpg 30722 bytes 565 x 512	PEC-OMP-2.jpg 54450 bytes 766 x 745
PEC-OMP-Inverter1.jpg 139973 bytes 1029 x 828	PEC-OMP-Inverter2.jpg 110430 bytes 1143 x 876	PEC-OMP-Test.jpg 126457 bytes 1067 x 1024

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10. Older history:

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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