Hi!
Couldn't help over hearing this thread.... I am a little confused as I thought my idea for my panel was going to work, but this has turned it on its head!
(oh - firstly, this is a stand alone panel - that may make a difference!)
My idea was to connect all the buttons' connections to a barrier strip/terminal block and all the grounds to another. Then, put 2 wires into each pole of the strip/block - one to the I-PAC and the other to a hacked Dreamcast controller.
There would be 2 cables coming out the back of the panel, but only one would be plugged in. I had thought this would work as the circuit(s) to the dreamcast pad would be complete regardless of the IPAC. As, of course, would the circuit(s) to the IPAC, regardless of the DC. Would this work, and if so - couldn't something like this be done?
Of course, Demon-Seed would want the controller plugged into the various boxes (PC, DC, etc...) continuously but would this be a problem. The only problem I could see would be too much resistance from all the various paths that the circuit was taking. If that was the case, would a few simple on/off switches connected to the ground help?
I can't figure out how to add an image so the circuit path would look like this..... (bare with me

)
Button NO GND
| |
| |
Barrier strip Barrier Strip
| | | |
| | | |
DC IPAC-------------/ /
| []- (switch)
|__________________|
You will have to excuse my first attempt at ascii drawing - I hope the original idea did not get too convoluted

Well - there it is - I have this funny feeling that it wouldn't actually work in practice, but can anyone actually tell me why?
thanks,
gb