Colossus Mark 2 computer

In 1994, a team led by Tony Sale began a reconstruction of a Colossus Mark 2 computer at Bletchley Park. Here, in 2006, Sale supervises the breaking of an enciphered message with the completed machine.

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.

Release dates:

Mk 1: December 1, 1943
Operational at Bletchley Park by February 5, 1944

Mk 2: June 1, 1944

Discontinued: June 8, 1945
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