Searched the forum, couldn't find and exact answer, so here goes:
I hacked a USB- and an Xbox360-joypad (to be precise, this thing:
http://www.slagcoin.com/joystick/pcb_diagrams/360_diagram2.jpg) for my bartop so I could also play the new arcade ports being released on it. Now, would it be possible to hook up 11 LEDs not only to an Ultimarc Leddrive (connected to a MAME-laptop) - which provides 5V, too - but at the same time to the 5V-output of the Xbox-pcb? This way, the buttons will at least be illuminated all the time when I play Xbox...
Cheers!