Just dropping a quick note that a fellow model railroader developed a small DIY DCC system based on the Lenz/Roco xpressnet. He also developed a simple throttle, a TCO and a computer-xpressnet adapter (similar to Lenz's computer-xpressnet adapter). The system can read and write CV's, addresses up to 9999, has a 16 loco stack, and control F0 and up to F12 functions. The project can be reviewed at http://www.tinet.org/~fmco/lokmaus_en.html I have been in contact with the designer and he has been able to revise the system based on help from others. If there is anyone out there with programming/microchip experience, please lend a hand. Thanks!