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Very interesting:

There is not only the "KryoFlux" which is designed to "preserve" old disk formats.
Unfortunately there is still no possibility for all these with KryoFlux read disk images to write it back to the floppy disk...

There is also HxC Floppy Emulator to the rescue !
It's a small board with a PIC18F462, uses a SD card as a mass storage, and can be connected through an usual floppy drive cable (34 pin).
So the old machine can use this board like a normal (mechanical) floppy drive.
A picture of this miracle:


Also, they have something similar to the KryoFlux:
A small board with an Altera MAX CPLD EPM7128S, which in fact is able to emulate the floppy drive with the appropriate "firmware". This device can only read (so far).
This is what it looks like:

http://hxc2001.free.fr/floppy_drive_emulator/
This device is connected - very user friendly - with the help of USB.

Also, there is another (ready made) device available, but very expensive:
See for more infos at http://www.floppy-emulator.de/