Unfortunately, things aren't quite that simple. It really depends on the machine you want to put the floppy in. In an A2000, the internal floppy cable *does* have a twist, but only on a couple of wires that carry the SELx signal. The cable that runs from the motherboard splices a couple of lines off, twists them, then goes "somewhat twisted" into DF0:, then the twist is reversed, and the cable goes 1:1 to DF1:. A standard PC floppy cable won't work here.
The twist is normally only on pins 4-6 on the Amiga, it's for the drive LEDs (in use 0 and in use 1). DF0 should be on the middle connector of the cable before the twist, and DF1 at the end after it.
Selects are set with jumpers on the drive. If you can't use the drive jumpers, then an additional twist between 10-12 is needed.
I don't know how the cable works in the A500, maybe it's just a simple 1:1. But in the A2000 it is definitely not.
It is a straight cable in all wedge amigas and the A1000.
