I'm in the middle of a small project to repair a spares or repair Duke and I'm thinking of converting it over to a USB connection (as one of the problems is a frayed cable) and everything I've read says that I don't need the red wire that's in the original cable. Obviously you couldn't get it to work with USB if you did, but I'm curious as to what it's used for if I don't need it. So far I've seen it called "Video Sync", +12V and VCC, but that doesn't tell me why it's there. Except maybe for "Video Sync", but why would a controller need video sync?