Alan Turing's invention of the programmable digital computer appeared in his 1936 paper "On Computable Numbers". However as it was only used as part of his main proof on computability in that paper, he never considered how such a machine might actually be built and made to work. Many years later this type of computer architecture was named a "Turing Machine".
After his World War 2 work at Bletchley Park and his exposure to Tommy Flowers' codebreaking programmable electronic digital computers called "Colossus", Alan Turing helped design and build stored program electronic digital computers (these were not based on his earlier "Turing Machine" invention).
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Alan Turing theorised about a computer but it was actually invented and built by Tommy Flowers, a post office engineer ! He spent 1000 pounds of his own money to ensure it was built and it cracked the German High Command code, The Lorenz Cipher, shortening WWII by a year.
1935, which makes it one year earlier than Alan Turing (but Zuse's idea was based on an externally stored program on punched tape while Turing's idea was based on an internally stored program which was more flexible).Zuse's computer was the first computer that operated on floating point numbers, instead of fixed point numbers (which meant his computers were far more usable for scientific and engineering purposes than most other computers, until the IBM 704 was built in 1954).
Alan had many pioneering roles, two of the most important is: 1. Defining all programs as a "Turing machine", a machine with a definite stopping condition. 2. Answering the Question , "Can a Machine Think?", with his communicating with a partner behind a curtain, man or machine. Watson and SIRI are latest answers.
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1942