Anyone, other than me, with a m559 mobo or similar noticed weird behavior of the internal floppy disk controller?

I have installed msdos 6.20 and two 1.44mb 3.5 floppy drives. A lot of classic floppy disk tools do not work, like teledisk, copyiipc, imagedisk... various errors like "drive not ready" or sourceID not found and so on. Even disk2fdi, a tool to extract adf files from Amiga disks had a fancy behavior and the programmer had to modify the tool to adapt it to this fancy fdc.

I'm testing various tools and for now, the working ones are Brutman's dskimage and Freedos diskcopy.

Other tests soon...