While looking for a different video, I found this one from 4 years ago. They're storing analog audio on a floppy disk, using an unmodified floppy drive!
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IIRC the drive may be unmodified, but they're using an entirely analogue drive controller to demodulate the audio and it's just so neat.
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That's the video that inspired me to build this... which is still sitting unfinished on my workbench in the way, oops
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Not an original hack, but spent today testing FM/PWM audio as Stage 0 proof of concept for a future more ridiculous floppy disk project.
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