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I opened up a mystery chip; it turned out to be a "switched capacitor filter" from 1984. Filters are important circuits, for example, adjusting the bass or treble in an audio signal. This chip, the MF10, was popular because it combined two filters into an easy-to-use chip. Let's take a closer look…

I remember this chip, but earlier. Perhaps 1981? I remember it being discussed when I was an intern. It looked very promising.