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Reverse-engineering the Yamaha DX7 synthesizer's sound chip from die photos


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YM2151 fans may enjoy Ken Shirriff's latest blog post, where he describes internal details of its beefy ancestor, the YM21280.  Some may recognize Ken from his frequent appearances on CuriousMarc's youtube channel.

The YM21280 is a marvel of efficiency, employing dynamic shift registers, logarithms/exponentials and other methods to save transistors.  One cannot help but admire the craftsmanship.

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