Eben Upton on the Raspberry Pi’s Industrial Crossover and Why There Will Never Be a Pi 9

The creator of the popular $35 computer explains the design of the new Pi 4

3 min read
photo of Eben Upton

The Architect: Eben Upton holds a Raspberry Pi and the smaller Pi Zero, designed for simpler tasks.

Photo: Jeff Gilbert/Alamy

Seven years ago, Eben Upton created the first Raspberry Pi. As Upton told IEEE Spectrum in our March 2015 cover story, the Pi was inspired in part by his childhood experiments with a BBC Micro home computer: He wanted modern kids to have a simple machine that allowed for similar experimentation. Since then, the Pi has exploded in popularity, and the fourth major revision of the Pi was released in June. Upton talked with Spectrum senior editor Stephen Cass about the Pi 4's design, its growing commercial use, and what might be next.

Stephen Cass: How has the Pi's user base evolved?

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The Ultimate Transistor Timeline

The transistor’s amazing evolution from point contacts to quantum tunnels

1 min read
A chart showing the timeline of when a transistor was invented and when it was commercialized.

Even as the initial sales receipts for the first transistors to hit the market were being tallied up in 1948, the next generation of transistors had already been invented (see “The First Transistor and How it Worked.”) Since then, engineers have reinvented the transistor over and over again, raiding condensed-matter physics for anything that might offer even the possibility of turning a small signal into a larger one.

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