The Embedded Microcontroller site posts detailed information on the timing necessary to interface with the Apple II/][ disk drive.
There is information available online on the Apple ][ disk interface, but it all appears to be somewhat incomplete to me. So here is the information that I believe is missing. I have captured these waveforms from a vintage Apple IIc computer.
Waveforms are available for all floppy operations.
See the details in the interesting post here.
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