As I read http://jimwarholic.com/2008/12/the-floppy-disk-drive-engineering-design.php and more I know this area all too well and have replaced these with small IDE to CF adapters that boot and run DOS 3.3 and up. Now there are a few that want this solution without all the hard work so I must write that I've been there, done this and all for a pretty penny.
Hope I save you the time heading down blind alleys.
I have some older equipment that only has a 3.5 floppy drive and I would like to convert that cable to access a USB drive.
Replacing the units is not an option but floppy failures are getting bad
There is no access to the industrial computer motherboard except thru the floppy cable.
An AUX board or module would be OK.
Thee equipment is used in a hot dirty environment as we are a DIECAST facility and that is where the robots are located.
I believe the operating is pre DOS 6
Any help would be greatly appreciated.