Hi All, I've tried to follow this thread and it looks like he's trying to use an interrupt routine to read serial information. I might be wrong?? I've used a similar interrupt routine to read in 5 bytes of info to control 7 Rc-servos. If you're interested it's located at my homepage: http://webhome.idirect.com/~bine Look under Robot Project heading. Just adding my 2 cents worth. Bye for now Eric