I have used older 1.44 PC disk drives on my Amigas.
These had the same jumpers as the old 720k models.
They work as a 720k and do not do 1.44 high density
disks. You must still use DD disks or tape the hole
on the high density disks.
I found them to work well as a spare drive, DF1 etc.
Not sure if all worked as DF0 though.
