Ken Shirriff's blog

Computer history, restoring vintage computers, IC reverse engineering, and whatever

Inside the Apple-1's unusual MOS clock driver chip

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Apple's first product was the Apple-1 computer, introduced in 1976. This early microcomputer used an unusual type of storage for its ...
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Reverse-engineering the waveform generator in a 1969 breadboard

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How hard could it be to fix a vintage solderless breadboard that doesn't quite work? The "elite 2 circuit design test system...
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A look inside the chips that powered the landmark Polaroid SX-70 instant camera

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The revolutionary Polaroid SX-70 1 camera (1972) was a marvel of engineering: the world's first instant SLR camera. This iconic camer...
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Yamaha DX7 chip reverse-engineering, part 6: the control registers

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The Yamaha DX7 digital synthesizer (1983) was the classic synthesizer in 1980s pop music. It uses a technique called FM synthesis to produ...
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Yamaha DX7 chip reverse-engineering, part V: the output circuitry

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The Yamaha DX7 digital synthesizer (1983) was the classic synthesizer in 1980s pop music. It uses a technique called FM synthesis to produ...
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