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How many Tunny messages could Colossus analyze in a week?
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Colossus
Funding for this code-breaking machine came from the Ultra project.
Once operational at Bletchley Park, the Colossus computer was capable of analyzing over 100 Tunny messages per week.1
This performance was a significant improvement over its predecessor, the "Heath Robinson," which could analyze no more than two or three messages in the same timeframe. Later, through the use of parallel processing in the Mark II Colossi, the speed of the system was increased further to 25,000 characters per second.1