In this episode we finish up our look at the birth of the transistor. But to do that we have to go back to 1880, the crystal radio detector, and examine the development of semiconductor devices. Once created the transistor would change not just how computers worked, but change how they could be used. That change didn't happen over night, and it would take even longer for the transistor to move from theory to reality.

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Important dates in this episode:

1939: Russel Ohl Discovers P-N Junction 1947: Point Contact Transistor Invented at Bell Labs 1954: TRADIC, First Transistorized Computer, Built