Colossus was the world's first programmable, electronic, digital computer. The Colossus computers were developed for British codebreakers during World War II to help in the cryptanalysis of the Lorenz cipher.
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Mk 1: December 1, 1943
Operational at Bletchley Park by February 5, 1944
Mk 2: June 1, 1944
Discontinued: June 8, 1945