There was another Xbox 360 to Atari adapter I'd heard about online, but it was a lot more complicated and less elegant than this one. Here's the link:Oh.
That's a really interesting solution to the multiple-ground issue. I found it far easier to just use a wireless pad (as I mentioned).
One of the primary goals of my mod was compatibility: I didn't want to have to hack up any pads or sticks to use them with this mod and make them less useful for all my other mods, and I wanted to preserve the functionality of the 360 pad. That's why I chose the wireless pad over the wired one: common ground made my job a ton easier... And the mod is so unnoticable that I use it as my main pad.
Sure, I could have put a jack on it like he did, but... Well, if I was gonna sacrifice a 360 pad I'd just gut it and put the whole PCB in a nice little box. Around here 360 pads are so expensive ($80!) and new that you never really find 'em cheap enough to just throw 'em away. If it WORKS you want to KEEP it. =)
Still, very interesting. Thanks for the link.