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harwell cadet wikipedia 75 captures 24 mar 2010 03 sep 2026 may jun jul 13 2021 2022 2023 success fail about this capture timestamps the wayback machine http web archive org web 20220613185137 https en wikipedia org wiki harwell_cadet harwell cadet from wikipedia the free encyclopedia jump to navigation jump to search first fully transistorised computer in europe this article is about the early transistor computer from harwell for the pre transistor dekatron computer from harwell see witch computer harwell cadet manufacturer aere release date february 1955 1955 02 memory 64k predecessor harwell dekatron computer harwell cadet computer the harwell cadet was the first fully transistorised computer in europe and may have been the first fully transistorised computer in the world the electronics division of the atomic energy research establishment at harwell uk built the harwell dekatron computer in 1951 1 which was an automatic calculator where the decimal arithmetic and memory were electronic although other functions were performed by relays by 1953 it was evident that this did not meet aere s computing needs and aere director sir john cockcroft encouraged them to design and build a computer using transistors throughout e h cooke yarborough based the design around a 64 kilobyte 65 536 bytes magnetic drum memory store with multiple moving heads that had been designed at the national physical laboratory uk by 1953 his team had transistor circuits operating to read and write on a smaller magnetic drum from the royal radar establishment the machine used a low clock speed of only 58 khz to avoid having to use any valves to generate the clock waveforms this slow speed was partially offset by the ability to add together eight numbers concurrently 2 3 the resulting machine was called cadet transistor electronic digital automatic computer backward it first ran a simple test program in february 1955 cadet used 324 point contact transistors provided by the uk company standard telephones and cables which were the only ones available in sufficient quantity when the project started 76 junction transistors were used for the first stage amplifiers for data read from the drum since point contact transistors were too noisy cadet was built from a few standardised designs of circuit boards which never got mounted into the planned desktop unit so it was left in its breadboard form from august 1956 cadet was offering a regular computing service during which it often executed continuous computing runs of 80 hours or more 4 5 cooke yarborough described cadet as being probably the second fully transistorised computer in the world to put to use second to an unnamed ibm machine 3 both the manchester university transistor computer and the bell laboratories tradic were demonstrated incorporating transistors before cadet was operational although both required some thermionic valves to supply their faster clock power so they were not fully transistorised 6 in april 1955 ibm announced the ibm 608 transistor calculator which they claim was the first all solid state computing machine commercially marketed 7 and the first completely transistorized computer available for commercial installation 8 and which may have been demonstrated in october 1954 before the cadet by 1956 brian flowers head of the theoretical physics division at aere was convinced that the cadet provided insufficient computing power for the needs of his numerical analysts and ordered a ferranti mercury computer in 1958 mercury number 4 became operational at aere to accompany the cadet for another two years before the cadet was retired after four years operation see also edit history of computing hardware second generation transistors references edit howlett jack computing at harwell retrieved 2008 12 07 cooke yarborough e h 1957 introduction to transistor circuits edinburgh oliver and boyd p 139 a b cooke yarborough e h 1998 some early transistor applications in the uk engineering science education journal 7 3 100 106 doi 10 1049 esej 19980301 lavington simon 1980 early british computers manchester university press p 139 isbn 0 7190 0803 4 cooke yarborough e h barnes r c m stephen j h howells g a 1956 a transistor digital computer proceedings of the iee part b radio and electronic engineering 103 3s 364 370 doi 10 1049 pi b 1 1956 0076 irvine m m 2001 early digital computers at bell telephone laboratories ieee annals of the history of computing 23 3 22 42 doi 10 1109 85 948904 ibm archives 1955 ibm archives ibm 608 calculator external links edit the harwell cadet computer retrieved from https en wikipedia org w index php title harwell_cadet oldid 1065143730 categories one of a kind computers computer related introductions in 1955 transistorized computers early british computers hidden categories articles with short description short description matches wikidata navigation menu personal tools not logged in talk contributions create account log in namespaces 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