A Computer Chip Without Semiconductors? How Does That Work?

These days we automatically associate computers and various mobile devices with chips made of semiconducting transistors. Indeed for many years the transistor has been a ubiquitous electronic component.

However, this was not always the case. In the past, devices called vacuum tubes, or valves were used in electronic devices.

Transistors vs. vacuum tubes/valves

A transistor is a binary device which acts as a switch, either preventing or allowing a current to flow. Transistors can also be...

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from Guiding Tech http://ift.tt/2hFNl6o