I happily just got my hands on my 2 original ST520's and 1 still works!
I'm hoping to hook a hard drive to my favorite computer. I've look and found the same trouble everyone else has found - no simple IDE readily available. I have some resources, know how and time I could devote. (PCB layout software, soldering skills, good chip programmer, programming skills in 68000 assembly.)
I can't seem to find any good info except the pin out for the drive cable, and that wonderful link on the DYI IDE interface.
I would really love to get the ACSI to IDE device going so I can hook up Flash memory as a drive.
I can't read German and haven't found the details of the ACSI interface.
If anyone can help send me info on the ACSI DMA interface I believe I can maybe figure out how to make it all work.