Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
The digital ranging system that measured the distance to the Apollo spacecraft
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During the Apollo missions to the Moon, a critical task for NASA was determining the spacecraft's position. To accomplish this, they d...
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Reverse-engineering the LM185 voltage reference chip and its bandgap reference
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Many circuits, such as a computer power supply or a phone charger, require a stable voltage reference, but it's harder than you might e...
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Reverse-engineering a mysterious Univac computer board
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The IBM 1401 team at the Computer History Museum accumulates a lot of mystery components from donations and other sources. While going thr...
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Inside the Apple-1's shift-register memory
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Apple's first product was the Apple-1 computer, introduced exactly 46 years ago, on April 11, 1976. This early microcomputer used an ...
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