If you're curious about how a Commodore 64 writes data to a 1541 drive across the IEC serial bus, this video will shed some light on that. I connected a logic analyzer to an IEC cable and captured all the bus traffic when I saved a Hello World program to a 1541 disk drive. In this video I walk through the captured traffic and explain the basics of the IEC bus protocol.

References:
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Music used in this video:
Electro Animal - Oh the City

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