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Text of the page (random words):
automatic computing engine wikipedia 242 captures 15 dec 2005 11 aug 2026 aug sep oct 28 2021 2022 2023 success fail about this capture timestamps the wayback machine http web archive org web 20220928222916 https en wikipedia org wiki automatic_computing_engine automatic computing engine from wikipedia the free encyclopedia jump to navigation jump to search british early electronic serial stored program computer this article s lead section may be too short to adequately summarize the key points please consider expanding the lead to provide an accessible overview of all important aspects of the article may 2020 pilot ace punch cards in tray for pilot ace computer built at the national physical laboratory united kingdom 1950 science museum london the automatic computing engine ace was a british early electronic serial stored program computer designed by alan turing it was based on the earlier pilot ace it led to the mosaic computer the bendix g 15 and other computers contents 1 background 2 pilot ace 3 mosaic 4 derivatives 5 footnotes 6 bibliography 7 external links background edit the project was managed by john r womersley 1 superintendent of the mathematics division of the national physical laboratory npl the use of the word engine was in homage to charles babbage and his difference engine and analytical engine turing s technical design proposed electronic calculator was the product of his theoretical work in 1936 on computable numbers 2 and his wartime experience at bletchley park where the colossus computers had been successful in breaking german military codes in his 1936 paper turing described his idea as a universal computing machine but it is now known as the universal turing machine citation needed turing was sought by womersley to work in the npl on the ace project he accepted and began work on 1 october 1945 and by the end of the year he completed his outline of his proposed electronic calculator which was the first reasonably complete design of a stored program computer and apart from being on a much larger scale than the final working machine anticipated the final realisation in most important respects 3 however because of the strict and long lasting secrecy around the bletchley park work he was prohibited because of the official secrets act from explaining that he knew that his ideas could be implemented in an electronic device 4 the better known edvac design presented in the first draft of a report on the edvac dated 30 june 1945 by john von neumann who knew of turing s theoretical work received much publicity despite its incomplete nature and questionable lack of attribution of the sources of some of the ideas turing s report on the ace was written in late 1945 and included detailed logical circuit diagrams and a cost estimate of 11 200 5 he felt that speed and size of memory were crucial and he proposed a high speed memory of what would today be called 25 kilobytes accessed at a speed of 1 mhz he remarked that for the purposes required the memory needs to be very large indeed by comparison with standards which prevail in most valve and relay work and so it is necessary to look for some more economical form of storage and that memory appears to be the main limitation in the design of a calculator i e if the storage problem can be solved all the rest is comparatively straightforward 6 the ace implemented subroutine calls 7 whereas the edvac did not and what also set the ace apart from the edvac was the use of abbreviated computer instructions 4 an early form of programming language initially it was planned that tommy flowers the engineer at the post office research station at dollis hill in north london who had been responsible for building the colossus computers should build the ace but because of the secrecy around his wartime achievements and the pressure of post war work this was not possible citation needed pilot ace edit main article pilot ace turing s colleagues at the npl not knowing about colossus thought that the engineering work to build a complete ace was too ambitious so the first version of the ace that was built was the pilot model ace a smaller version of turing s original design turing s assistant jim wilkinson worked on the logical design of the ace and after turing left for cambridge in 1947 wilkinson was appointed to lead the ace group 8 the pilot ace had fewer than 1000 thermionic valves vacuum tubes compared to about 18 000 in the eniac 9 it used mercury delay lines for its main memory each of the 12 delay lines was 5 feet 1 5 m long and propagated 32 instructions or data words of 32 bits each this ran its first program on 10 may 1950 at which time it was the fastest computer in the world each of its delay lines had a throughput of 1 mbit s 10 the first production versions of the pilot ace the english electric deuce of which 31 were sold were delivered in 1955 11 mosaic edit a second implementation of the ace design was the mosaic ministry of supply automatic integrator and computer this was built by allen coombs and william chandler of dollis hill who had worked with tommy flowers on building the ten colossus computers it was installed at the radar research and development establishment rrde at malvern which later merged with the telecommunications research establishment tre to become the royal radar establishment rre it ran its first trial program in late 1952 or early 1953 and became operational in early 1955 mosaic contained 6 480 electronic valves and had an availability of about 75 it occupied four rooms and was the largest of the early british computers it was used to calculate aircraft trajectories from radar data it continued operating until the early 1960s 4 12 13 derivatives edit the principles of the ace design were used in the bendix corporation s g 15 computer 14 279 the engineering design was done by harry huskey who had spent 1947 in the ace section at the npl he later contributed to the hardware designs for the edvac the first g 15 ran in 1954 citation needed and as a relatively small single user machine some consider it to be the first personal computer 15 other derivatives of the ace include the emi electronic business machine and the packard bell corporation pb 250 16 footnotes edit copeland 2005 chapter 3 turing alan m 1936 on computable numbers with an application to the entscheidungsproblem proceedings of the london mathematical society 2 published 1937 vol 42 no 1 pp 230 65 doi 10 1112 plms s2 42 1 230 and turing alan m 1938 on computable numbers with an application to the entscheidungsproblem a correction proceedings of the london mathematical society 2 published 1937 vol 43 no 6 pp 544 6 doi 10 1112 plms s2 43 6 544 origins and development of the ace project b j copeland in copeland 2005 a b c m g hutchinson 2016 1952 a computer comes to malvern vale malvern radar and technology history society retrieved 25 july 2017 copeland 2005 chapter 20 part i section 10 proposed electronic calculator turing 1945 reprinted copeland 2005 copeland 2005 chapter 20 part i section 6 jim wilkinson led the team that built the pilot ace national physics laboratory retrieved 1 october 2019 the ace test assembly h d huskey in copeland 2005 programming the pilot ace j g hayes in copeland 2005 copeland 2012 pp 4 164 327 catalogue the mosaic computer baaz matthias papadimitriou christos h putnam hilary w scott dana s jr charles l harper 6 june 2011 kurt gödel and the foundations of mathematics horizons of truth cambridge university press p 173 isbn 9781139498432 carpenter b e doran r w 1977 the other turing machine the computer journal 20 3 269 279 doi 10 1093 comjnl 20 3 269 archived from the original on 3 june 2012 harry huskey obituary san francisco chronicle 16 april 2017 retrieved 17 april 2018 b jack copeland 2004 the essential turing oxford university press pp 370 371 isbn 9780198250791 retrieved 28 july 2017 bibliography edit carpenter b e doran r w 1977 the other turing machine the computer journal 20 3 269 279 doi 10 1093 comjnl 20 3 269 archived from the original on 3 june 2012 carpenter b e doran r w 1986 a m turing s ace report of 1946 and other papers cambridge mit press copeland b j ed 2005 alan turing s automatic computing engine oxford oxford university press isbn 0 19 856593 3 copeland jack 2006 colossus and the rise of the modern computer in copeland b jack ed colossus the secrets of bletchley park s codebreaking computers oxford oxford university press pp 108 110 isbn 978 0 19 284055 4 copeland b jack 2012 alan turing s electronic brain the struggle to build the ace the world s fastest computer oup oxford isbn 9780199609154 lavington simon h 1980 early british computers the story of vintage computers and the people who built them manchester university press wilkinson j h 1980 turing s work at the national physical laboratory and the construction of pilot ace deuce and ace in metropolis nicholas howlett j rota g c eds a history of computing in the twentieth century new york academic press yates david m 1997 turing s legacy a history of computing at the national physical laboratory 1945 1995 london science museum external links edit oral history interview with donald w davies charles babbage institute university of minnesota davies describes computer projects at the u k national physical laboratory from the 1947 design work of alan turing to the development of the two ace computers davies discusses a much larger second ace and the decision to contract with english electric company to build the deuce possibly the first commercially produced computer in great britain events in the history of npl ace computer authority control national libraries germany retrieved from https en wikipedia org w index php title automatic_computing_engine oldid 1097032118 categories 1940s computers alan turing early british computers one of a kind computers english inventions 1940s in computing computer related introductions in 1950 serial 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