I found one of these things over the past weekend when I was traveling and for the nice price of $12 I picked it up. :-D I remember seeing a topic talking about it a while back on the board, as well as the following site that detailed a ton of different systems that the guy adapted the controller for: http://www.pipitan.com/cpsf.html
Anyways, I took mine apart for the cleaning that every hardware device to come into my home receives, and found some rather odd and interesting things. This page details the addon of a wireless unit for what I'm assuming is the CPS Changer edition of the CPFS. While my unit has the battery door on the bottom and a cover over the second port in the back where the wireless adaptor attaches, the PCB inside the unit has neither the wireless port (although there is an outline on the board where it would be soldered) nor any hardware running to the battery compartment. So does this mean that possibly only the CPS Changer edition had the wireless ability, but Capcom decided to save some cash by using the same mold for the shells and the same plans for the boards?
Also, while I'm on the topic of this neato stick, upon taking it apart, I've found that the joystick uses standard leaf-style arcade microswitches, wired up with nothing more complex than quick disconnect cables. I'm thinking about ordering a set of Cherry microswitches from Happ Controls and throwing those in. Also, the LEDs that come on near each of the buttons are the large standard ones (3.3v, perhaps?) found easily at any electronics store, and there is plenty of room on the PCB to attempt to switch LED colors - I'm almost tempted to try it myself, it looks that simple.
On to the annoying question side of things, on the site I linked to above, I noticed that a lot of the different system mods for the CPFS were made possible with this cable, something that looks to end in some sort of PS/2 connector. Are these very common to find, and what would the price run? Also, what's the rarity and price on the neato white Genesis version of the stick?
And finally, not quite related, but what the hell is this X HE-3 adaptor thingie about halfway down the original page, and where could I get one? Playing Street Fighter 2 CE on the PC Engine would really rock with the CPFS.