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In page Whirlwind I:

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The Whirlwind design incorporated a control store driven by a master clock. Each step of the clock selected one or more signal lines in a diode matrix that enabled gates and other circuits on the machine. A special switch directed signals to different parts of the matrix to implement different instructions.[citation needed] In the early 1950s, Whirlwind I "would crash every 20 minutes on average."[3]