Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
The Yamaha DX7 synthesizer's clever exponential circuit, reverse-engineered
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The Yamaha DX7 digital synthesizer was released in 1983 and became extremely popular, defining the sound of 1980s pop music. Because micro...
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Reverse-engineering the Yamaha DX7 synthesizer's sound chip from die photos
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The Yamaha DX7 digital synthesizer was released in 1983 and became "one of the most important advances in the history of modern popul...
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Reverse-engineering an unusual IBM modem board from 1965
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The vintage IBM circuit board below has a large metal block on it that caught my attention, so I investigated it in detail. It turns out t...
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