This is a simple board that will convert the “unobtainable” DIN14 plug to a standard 14-pin IDC header.
Buy one of these to use with an External Floppy Adapter to add a new external drive to your Atari ST, or buy two of them to use together to make a cable for existing DIN14 devices.
Don’t forget an IDC14 Cable!
This may also be useful for other vintage systems that use the DIN14 plug such as certain Amstrad and other systems.
Full plans available at https://github.com/5vsupply/Atari_Floppy