I've got it to work, here is what I needed to do.
Modifications to ALPS DF354 N120F (modern PC floppy drive) to work with Atari STF. Remove bottom cover to expose this circuit board, then make the following changes:-
1. o/c DS1, s/c DS0 - drive select
2. o/c NO1, next to pin 1
3. Make link between pin 2 and Gnd - density select
4. Make link between MIS (core 4 on the white ribbon cable) and pin 1 of the disk connector. - media change
Replace bottom cover.
This is a good drive to use as:-
i. Cable connector notch is correct - red line to motor.
ii. Mounting screws align correctly.
iii. Ribbon can be folded to give the drive being the correct way up and flush with case edge.
iiii. Power leads are long enough.
This drive with these modifications also works with the disk refresh signal, ESC etc.
Finally, the aperture in the ST’s plastic case will need enlarging to accommodate.
This worked for me!
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