Hi Mikkel; Thanks for your info. With your explanation and a little extra googeling I was able to learn that device registration starts with the setup.c (Setup.S) in the kernel code with the creation and compilation of the Interrupt Description Table and the Global Description Table. I am just digging in now, but it seems to be all there. On Wed, 2007-12-12 at 13:55 -0600, Mikkel L. Ellertson wrote: > William Case wrote: > > Hi Mikkel; -- Regards Bill