* the 765 has drive select pins to directly select one of four floppy drives, while the 179x has none. Instead, external logic must be used to handle multiple drives.
* 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.
Note: While the Oric uses the same 3inch floppy disks as the Amstrad CPC, it uses the WD1773 (Jasmin) or WD1793 (Microdisc) FDC chip.
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