For anyone else that might read this looking for an input cable that works with the ip-bus. I found a how-to online for making your own cable out of 2 computer cables that I happen to have laying around anyway and one end of an rca cable. It's working flawlessly with my dmp1. Only cost me an hour or so of my time to solder the thing together.....I guess you could say I'm kinda cheap.
For anyone interested
THIS is a schematic for the ip-bus connector and
HERE'S another one with a little more description.
