Yamaha DX7 reverse-engineering, part III: Inside the log-sine ROM

.hilite {cursor:zoom-in} a:link img.hilite, a:visited img.hilite { color: #fff;} The Yamaha DX7 digital synthesizer (1983) was the classic synthesizer for 1980s pop music. It used two custom digital chips to generate sounds with FM synthesis. In this blog post, I examine the log-sine ROM that digitally produces sine waves inside one of these chips. (This blog post jumps into the details; unless you care about the sine values specifically, my previous DX7 reverse-engineering article is prob...

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