Changes
/* FDC Command Table (15 commands) */
* Recalibrate: Walks up to 77 tracks, 80tr-drives may need second recalib if failed
* Seek / Recalibrate: All read/write commands will be disabled until succesful sense interrupt
* Specify: All timings have to be doubled on CPC because the FDC runs at 4MHz instead of 8MHz for the datasheet
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