I managed to get a Famicom Microphone to work on an NES. I also realized you could run basically any audio source through an NES and went kinda nuts with it. :
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Famicom Microphone on US Zelda Cartridge - YouTube
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Microphone Roundup - Top 5 Famicom Games for the Player 2 Mic | @FamicomDojo - YouTube
NES Hardware
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Nerdly Pleasures: The Famicom Microphone - Obscure Functionality
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