openpic/mac-io

Hi, 

I am searching for documentation about the OpenPIC interrupt-controller in mac
systems. I found this site but most of the links are dead or give no hope on
real technical documentation :).
http://www.macbsd.com/openmac/refs.html

Could someone give any pointers or files?

I am also searching for any related documentation on the mac-io device (this
could be a combo document).

I am trying to do a port as a masters project, and my biggest problem is:
documentation :(.

Thanks
  Ingmar.