This is a study how to read and write Floppies without a floppy disk controller. I developed two solutions. One is a pure software solution running on a AVR processor and the other is a MFM de/encoder using a small CPLD

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Once you have mastered reading a floppy the next step is writing a sector

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Instead of counting cycles a far better approach is to use a timer. Here is now a MFM write sector routine that uses a timer to create the write pulses.

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