Reverse-engineering and comparing two Game Boy audio amplifier chips

Reverse-engineering and comparing two game boy audio amplifier chips @

The Nintendo Game Boy contains an audio amplifier chip for sound through a speaker or headphones. In this post, I reverse-engineer this chip and compare it with the later Game Boy Color chip (reverse-engineered earlier). Unexpectedly the Game Boy Color uses an entirely different amplifier design from the original Game Boy, which may explain why the two systems sound different.

from Dangerous Prototypes