[HAL9000]

OK, bored at work today, so I decided to map out exactly what makes the blue, grey, and black connectors on an ultra cable unique and here is what I have. All cables run straight through with the following exceptions.

Blue Connector;

-Pins 2, 19, 22, 24, 26, 30, 34, and 40 are all commonly connected to the 40 ground wires.

-Pin 34 is connected to the ground wires, but is NOT physically connected to the cable.

Grey Connector;

-Pins 2, 19, 22, 24, 26, 30, 40 are all commonly connected to the 40 ground wires.

-Pin 28 has no connection to anything at all.

Black Connector;

-Pins 2, 19, 22, 24, 26, 30, 40 are all commonly connected to the 40 ground wires.

-All 40 data wires are connected.

So, how does each one become unique, it all seems to come down pins 28 and 34. The motherboard connection (blue) and the master drive connection (black) have a data wire connected to pin 28, where the slave drive (grey) does not. If it were only this difference, one should be able to reverse the cable to accomodate certain cable routing situations, but, there is pin 34 which is connected to the ground wires on all three connectors, but the data wire for pin 34 is only connected to the motherboard and slave, not the master drive. This is where things get screwed up if you try to reverse the cable as you now have an incorrect connection sequence.

Hopefully this has shed a bit more light on the ultra cable connection and not created more confusion.