The Japanese Saturn pad will work on the US unit ONLY if you region mod the system. You also need to modify the video signal from NTSC-U to NTSC-J or it will not work. Finally, you need a Pro Action Replay cartridge (must be v 1.1, no higher or lower!!) and will need to input the code:
F6000924 C305
B7002800 0000
F6000524 C305
B6002800 0000
160A6870 0200
160A6800 0063
F6000914 C305
B6002800 0000
So it's pretty easy and works great! Oh, and you'll need to put a 1k resistor and a twin-pot transformer in the Japanese pad on wire 3.
Or you can just plug it in without doing any of the steps above and enjoy it.
