The [[Vortex Disc Drives|Vortex disc interface]] uses other ports. See its dedicated wiki page.
The main competitor of the µPD765 FDC controller on the market at that time was the WD179x FDC chip family.
The primary difference between 765 and 179x controllers is that the 765 only does standard formats (preamble, marks and data fields), while the 179x will write anything you tell it in the format mode.
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