For DF0: the device number must be set to DS0 on the drive and this must have the cable with the twist in it.. I beleive you peel out 4,5,6 and turn them around and put them back in.
For DF1: the drive number must be set to DS1 on the drive and this must have the section of cable that is not twisted.
If you have a DF1: in the machine you need to set these jumpers:
|DF1: ENABLE (J351)||enable 2nd internal floppy (880 KB) as DF1:||closed|
|DF1: ENABLE (J351)||no 2nd internal floppy, or 1.76MB floppy as DF1:||open|