PRU tips: Understanding the BeagleBone's built-in microcontrollers

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The BeagleBone Black is an inexpensive, credit-card sized computer that has two built-in microcontrollers called PRUs. While the PRUs provi...
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The BeagleBone's I/O pins: inside the software stack that makes them work

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The BeagleBone is a inexpensive, credit-card sized computer with many I/O pins. These pins can be easily controlled from software, but it ca...
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Restoring Y Combinator's Xerox Alto, day 4: What's running on the system

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This post describes our continuing efforts to restore a Xerox Alto. We checked that the low-level microcode tasks are running correctly a...
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Restoring Y Combinator's Xerox Alto, day 3: Inside the disk drive

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I'm helping restore a Xerox Alto — a legendary minicomputer from 1973 that helped set the direction for personal computing. This post ...
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Restoring Y Combinator's Xerox Alto, day 2: Repairing the display

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This post describes how we repaired the monitor from a Xerox Alto. The Alto was a revolutionary computer, designed in 1973 at Xerox PARC ...
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"Hello world" in the BCPL language on the Xerox Alto simulator

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The first programming language for the Xerox Alto was BCPL, the language that led to C. This article shows how to write a BCPL "Hell...
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Inside the tiny RFID chip that runs San Francisco's "Bay to Breakers" race

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How does a tiny chip time the runners in the Bay to Breakers race? In this article, I take die photos of the RFID chip used to track ath...
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