No sound chip is as ubiquitous as the Ricoh 2AO3 found in the NES and Famicom consoles. 5-channels wide (usually only four were used), the sounds of this 8-bit microprocessor were cemented into the brains of anyone who was in the room with it. Some of the most enduring songs ever produced in video games got their start on that unassuming slab of plastic and silicon. Today, when someone wants to make a video game soundtrack sound vintage, they parrot the tones of the...