NES Audio
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The NES only has its internal 2A03 audio because it can't accept audio externally (aside from the 48-pin expansion port on the underside of the NES motherboard). Although its Japanese counterpart, the Famicom, has 2 pins on it's cart connector for Audio in and out allowing for soundchips to be put in cartridges and have the audio feed into the audio lines.
Soundchips:
