* Gaps are necessary to accommodate variations in rotation speed between different drives and avoid overlapping.
The main competitor of the µPD765 FDC chip on the market was the WD179x FDC chip family. The primary difference between Its main differences are:* the 765 and has 4 status registers while the 179x controllers is that only has one.* the 765 has 3 scan commands while the 179x has none.* the 765 only does standard track formats (preamble, marks and data fields), while the 179x will write anything you tell it in the write track (formatting a track) mode.
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