October 7: A Transistor Calculator for the First Time

On October 7, 1952, IBM researchers convert an existing vacuum tube calculator, the Model 604, to use transistors. This experiment did neither shrink or speed up the desk-sized machine, but it did consume just 5% of the power that the vacuum tube-based device did. Following this successful experiment, IBM released the model 608, the first commercial transistor calculator, four years later.

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