Ken Shirriff provides an excellent dive into reverse-engineering the audio amplifier chip in the Nintendo Game Boy Color.
The Nintendo Game Boy Color is a handheld game console that was released in 1998. It uses an audio amplifier chip to drive the internal speaker or stereo headphones. In this blog post, I reverse-engineer this chip from die photos and explain how it works. It’s essentially three power op-amps with some interesting circuitry inside.
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