The Robinson, the predecessor of Colossus, never really worked satisfactorily in speeding up the breaking of Hitler's most secret cypher. The Robinson reconstruction team may have a clue as to why.
For the first time since the end of WWII, Bill Tutte's Double Delta algorithm was successfully run on the Robinson. This was part of the ongoing reconstruction of Robinson, the predecessor of Colossus.
A video of Charles Coultas of the Robinson reconstruction team testing the valve amplifier for Robinson, the machine that inspired Colossus.
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