Operating a rebuild Colossus - World's First Electronic Computer Part-1
Operating reconstructed Colossus the World's First Electronic Computer Part-1
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Colossus
Birth of the digital computer
Colossus was an electronic digital computer, built during WWII from over 1700 valves (tubes). It was used to break the codes of the German Lorenz SZ-40 cipher machine that was used by the German High Command. Colossus is sometimes referred to as the world's first fixed program, digital, electronic, computer. It was developed and built before the American ENIAC computer. 1
Colossus was designed by Tommy Flowers, an electronics engineer of the Post Office Research Station (part of the General Post Office, GPO) at Dollis Hill (UK), with input from Harry Fensom, Allen Coombs, Sid Broadhurst and Bill Chandler. It was used to solve a problem posed by Max Newman, a codebreaker at Bletchley Park.
in 1993 by Tony Sale and his team of volunteers, to start the Colossus Rebuild Project.
Colossus on the other hand, was used to break the Lorenz SZ-40/42. A highly sophisticated teleprinter attachment with no less than twelve complex cipher wheels. It was used by the German High Command for messages at the highest level, for example between Hitler and Field Marshal Rommel in North Africa.
The first Colossus was delivered at Bletchley Park on 18 January 1944 and broke its first message on 5 February of that year. It was succeeded by Colossus Mark II, which consisted of no less than 2400 valves. The first Colossus Mark II was delivered on 1 June 1944 — just five days before the D-Day landings on the Normandy coast — and immediately produced good intelligence. In total 10 Colossi were installed before the end of the war. After the war all Colossi were dismantled. Except of those machines that were probably transferred to the GCHQ together with the 6 Bomb machines.
https://www.gchq.gov.uk/
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Operating Colossus the World's First Electronic Computer Part-1