Page last updated at 12:17 GMT, Monday, 1 February 2010

'World's first computer' Colossus cracked Nazi code

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Jerry Roberts used the Colossus computer in Bletchley during World War 2 to decipher the Nazis' Tunny code.

Colossus was brought into service during World War 2.

Those who worked with it say it was the world's first programmable computer but that its status was never recognised publically because information about it was classified under British secrecy laws.

He told BBC Technology Reporter Andrew Webb about his work.

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