Xbox Power Supply Compatibility. 

$29.00 Power Supplies Available HERE

You can convert a 1.0/1.1 to a 1.2-1.5 by using this diagram

1.0-1.1 to 1.2-1.5 Adapter Available here

1.0-1.1 Consoles have power supplies with an AT style connector (one row of pins)

1.2-1.5 Consoles have power supplies that have an ATX style connector (two rows of pins)

1.6a and 1.6b also use the same connector use this photo to distinguish between the two, note the square of four missing wires on the 1.6 versions.

See also Xbox version comparison