Hi
FDD connectors should all be the same universally with the Amigas. The Parallel port on the A1000 was indeed different from the rest of the Amigas, but every one after the A1000 was the same. Some also say that the L R out for audio is reversed on some Amigas but I've personally never come across this phenomenon. channels 0 and 3 should be L and 1 and 2 should be R.
