If your like me and your apple units all have Unidisk DB19 Plugs, it is annoying trying to work with 3 party devices or drives with 20 pin IDC connectors.
I have some SDCard readers that I want to boot off, but also some unidisk and Disc ][ devices, so I have designed this and placed it on github if you want to make one. It allows you to connect 2 x 20 pin devices or 1 20 pin as drive 0 (SD Boot) and then have your DB19 unidisk as a second drive.
please feel free to use at your own risk. I would like someone to test with floppy emu as I don't have one.
Regard Paul in Australia.