Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Christmas shopping the IBM way: computerized gift selection in 1962
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In 1962, the Simpson's department store in Toronto used an IBM computer to help customers select Christmas gifts, based on the charact...
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Reverse-engineering a tiny 1980s chip that plays Christmas tunes
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For the holidays, I decapped a chip that plays three Christmas melodies. The UM66T melody chip from the 1980s was designed for application...
10 comments:
Yamaha DX7 chip reverse-engineering, part 4: how algorithms are implemented
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The Yamaha DX7 digital synthesizer (1983) was the classic synthesizer in 1980s pop music. It uses two custom digital chips to generate sou...
12 comments:
Yamaha DX7 reverse-engineering, part III: Inside the log-sine ROM
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The Yamaha DX7 digital synthesizer (1983) was the classic synthesizer for 1980s pop music. It used two custom digital chips to generate so...
6 comments:
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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