From: Jon Agar <AGAR@fs4.ma.man.ac.uk> To: history-of-computing-uk@mailbase.ac.uk Date: Fri, 7 Jun 1996 22:15:58 BST Subject: Colossus ----------forwarded from shothc-l--------- Date: Fri, 7 Jun 1996 11:21:31 +0100 To: cs-all@newcastle.ac.uk, SHOTHC-L@SIVM, Rosemary Lockie <Rosemary@yacc.demon.co.uk>, "Michael R. Williams" <williams@CPSC.UCALGARY.CA> From: Brian.Randell%newcastle.ac.uk@ukacrl (Brian Randell) Subject: The Colossus Rebuild Project Hi All: Yesterday I attended the ceremony at Bletchley Park for the formal switching on of the recreated Colossus computer. It was a glorious day, attended by about two hundred people, many of whom had worked on code-breaking at Bletchley Park during the war, and both Tommy Flowers who original designer of the Coplossus, and Bill Tutte the cryptanalyst who first broke the Fish cipher. The Colossus Rebuild Project is essentially due to one person, Tony Sale, who is I'm sure uniquely qualified for such a project. He was for many years with M.I.5 (including a period as technical assistant to Peter Wright, of "Spycatcher" fame/notoriety) and so has a very high security clearance, he is a real expert on ancient electronics, he was for several years a Senior Curator at the Science Museum, London, (where he led the project which got a Ferranti Pegasus and an early Elliott computer operational again) and he has an unbelievable ability to get things done. The document attached below is the press briefing for yesterday's ceremony. The recreated Colossus is remarkably authentic (not just in looks), though not yet finished. (It was however complete enough yesterday to read encrypted messages from the 5000 character per second paper tape, do some basic processing using an electronic version of the Lorenz (Tunny) rotors, and output counts onto an electromechanical typewriter - all *very* impressive. There are also a whole series of rooms in which the various aspects of the wartime work, from radio interception, through to processing and indexing the results of the codebreaking are portrayed and explained. There is a Typex machine, Naval Enigma, a Siemens Geheimschrieber and a Lorenz SR42 (Tunny) cipher machine on display, plus lots of other artefacts - such is the extent to which Tony Sale has been getting cooperation from Bletchley Park's modern counterpart. When in the mid 1970s I succeeded in getting the Colossus partly declassified, and some photographs of it released, I never dreamt that, over twenty years later, I would actually see a real - albeit recreated - one! Cheers Brian PS You will find a home page for the Colossus Rebuild Project at: http://www.cranfield.ac.uk/CCC/BPark/colossus Dept. of Computing Science, University of Newcastle, Newcastle upon Tyne, NE1 7RU, UK EMAIL = Brian.Randell@newcastle.ac.uk PHONE = +44 191 222 7923 FAX = +44 191 222 8232 URL = http://www.cs.ncl.ac.uk/~brian.randell/ ====== The Colossus Rebuild Project Helping to save Bletchley Park by Tony Sale, FBCS. The switching on of the rebuilt Colossus on Thursday 6th June 1996 by His Royal Highness the Duke of Kent KG. Briefing notes. Colossus was the first large electronic valve computer in the world and it was fully operational in the Spring of 1944, helping to break the German Army High Command messages enciphered using the Lorenz cipher machine. By the end of WW II ten Colossi were operating in Bletchley Park, the home of Allied code breaking operations. Each one of them used 2,500 electronic valves and they represented a major technological triumph for British invention. Designed by Dr Tommy Flowers and his team of engineers at the Post Office research labs at Dollis Hill and manufactured at great speed they contributed significantly to the war effort by the intelligence that they revealed before and after D Day, 6th June 1944. The Colossi were special purpose, high speed logic calculators of great reliability. They were kept switched on and running 24 hours a day and operated by girls from the Women's Royal Naval Service, the WRENS. The very existence of the Colossi was kept a closely guarded secret and unfortunately all but two of them were totally destroyed at the end of 1945. The reasons for this are still not clear. A blanket of silence descended on everything to do with Bletchley Park and this has, until now, prevented Colossus taking its rightful place as one of the greatest achievements of British technology. It has also allowed the Americans, for far too long, to claim that their ENIAC computer, which first ran in 1946, was the first large electronic valve computer in the world. The first revelations about Colossus appeared in 1970 when Jack Good, one of the wartime code breakers, gave a brief description in a journal article. This was followed in 1972 by further revelations by Donald Michie another of the code breakers and then by the researches of Prof Brian Randell. But even then Colossus was classified as secret and only a few photographs and general details were allowed out. In 1993 Tony Sale had just finished working at the Science Museum in London restoring some early computers back to working order. Having studied all the available meagre details about Colossus, he decided that given his early career in valve electronics, his involvement with Ml5 and subsequent long career in computing, it would be possible to rebuild a working Colossus. An approach to GCHQ resulted in all the hardware details about Colossus being declassified and a further set of wartime photographs emerged from GCHQ archives. Some of the original engineers were still alive, including Dr Tommy Flowers, and they were all enthusiastic about such a project. Work began in November 1993 to reproduce machine drawings from the photographs. (All the original drawings had been destroyed in 1960). All attempts at getting sponsorship for the project failed and Tony Sale and his wife Margaret decided to put their own money into it in order to make a start since, in view of the age of the original engineers, time was of the essence. By July 1994 all the gathering of Information had been done and the construction phase of the project was inaugurated by His Royal Highness the Duke of Kent KG in Bletchley Park on the 18th July. The Bletchley Park Trust, of which Tony Sale is Museums Director, has kindly made space available and the construction has taken place in the actual room in H Block where Colossus number 9 stood in WW II. Two years of hard work helped by an ever growing band of volunteers, including some members of the Computer Conservation Society, and some gratefully received financial donations has resulted in 90% authentic rebuild of Colossus which will now be able to demonstrate its code breaking feats of WW II. His Royal Highness has kindly agreed to switch on Colossus at 10.00 am on Thursday 6th June 1996, an auspicious occasion since it is the anniversary of D Day for which Colossus helped to provide vital intelligence information. For further Information contact Tony Sale on 01908 645001 or 01234 822788 or by fax on 01908 247381 or by email tsale@qufaro.demon.co.uk