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Alan Turing's Automatic Computing EngineThe Master Codebreaker's Struggle to build the Modern Computer$
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B. Jack Copeland

Print publication date: 2005

Print ISBN-13: 9780198565932

Published to Oxford Scholarship Online: January 2008

DOI: 10.1093/acprof:oso/9780198565932.001.0001

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Notes on memory (1945)

Notes on memory (1945)

(p.455) 21 Notes on memory (1945)
Alan Turing's Automatic Computing Engine

Alan M. Turing

Oxford University Press

This chapter presents fragments from Turing's draft of ‘Proposed Electronic Calculator’. This material is of interest chiefly because of its remarks concerning the universal machine of Turing's 1936 paper ‘On Computable Numbers’. In 1947, Turing described electronic stored-programme digital computers as ‘practical versions of the universal machine’ and it is clear that in designing the ACE, his aim was to replace the paper tape of the universal machine with a practical form of memory for holding instructions and data, and to replace the abstract ‘scanner’ of the universal machine by a ‘central pool of electronic equipment’.

Keywords:   Alan M. Turing, reports, On Computable Numbers, Proposed Electronic Calculator

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