Changes
/* FDC Command Table (15 commands) */
Notes:
* Specify: All timings will be doubled on CPC because the FDC runs at 4MHz instead of 8MHz for the datasheet
* Format Track: The processor must supply C, H, R, N to the FDC for each sector during execution phase
* Recalibrate: Walks up to 77 tracks, 80tr-drives may need a second recalibrate if failed
* Seek / Recalibrate: All read/write commands will be disabled until successful sense interrupt
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