Superbeta transistors inside: Die photos and analysis of the LM108 op amp

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The LM108 op amp is an interesting chip to examine under a microscope because it uses special superbeta transistors for high performance....
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Inside a RFID race timing chip: die photos of the Monza R6

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I recently watched a cross-country running race that used a digital timing system, so I investigated how the RFID timing chip works. Ea...
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Simulating a Xerox Alto with the ContrAlto simulator: games and Smalltalk

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The revolutionary Xerox Alto computer came out in 1973 and set the direction for personal computing. If you want to try out the Alto'...
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Restoring YC's Xerox Alto day 10: New boards, running programs, mouse problems

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Last week our vintage Alto was crashing; we traced the problem to an incompatibility between two of the processor boards. Today we repla...
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Restoring YC's Xerox Alto day 9: tracing a crash through software and hardware

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Last week, after months of restoration, we finally got the vintage Xerox Alto computer to boot ( details ) and run programs. However, so...
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How I added 6 characters to Unicode (and you can too)

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Edit (June 2018): Unicode 11 is released, containing the half stars. Now the wait for font support... Star characters (☆★) have long b...
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Restoring a vintage Xerox Alto day 8: it boots!

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We've been restoring a Xerox Alto from the 1970s for several months, and we finally got it to boot and run some programs! There's ...
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