I found that my issue with BigRAM 2630 and my floppy drives not working was caused by the CloanTo 3.x ROM.
Problems with floppy drives and the "3.X" ROM have been reported before, on this forum and others. I think somebody actually disassembled one and found out what the exact cause was, but TL;DR. For the rest of us just stick with a 3.1 ROM (or burn a custom 3.9 one). I wouldn't trust that so-called 3.X ROM as far as I could throw it.
