I am exploring a ST-506 to some standard interface. Then from the standard interface to your choice of retro computer interface.
Apparently the MFM to SASI interface already exists. This whole idea spawned from having a Corvus Systems hard disk with no interface to any computer. I just purchased a S-100 corvus interface, but I am waiting to see if it's works. I would really like a Corvus SYstems hard disk to Atari interface, but that seemed next to impossible. A guy from AtariAge said he could help, so I am gonna wait for now. What would really be cool is a SASI to USB interface. Then we could access all the rare data stored all over ebay. Hell, I would have a field day buying old drives on the cheap and seeing whats on them.
There are easier solutions i'm sure, but learning how ST-506 works would be a cool way to cut my teeth on electronics design.