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765 FDC

52 bytes added, 06:11, 22 April 2025
/* Chip Variants */
* the 765 has 3 scan commands, while the 179x has none.
* the 765 has 5 status registers, while the 179x only has one.

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* the 765 has multi-byte "command phase" and "result phase", while commands are issued to the 179x by writing a single byte to the Command Register, after having set parameters in its dedicated registers. After * the 765 has multi-byte "result phase", while the 179x has none. After a command completes, the Status Register contains all the status information is contained in the Status Register as a single byte.
* 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.
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