So thanks to the help of Jason Thorpe, and Roland Dowdeswell I got this
machine running.  As it turns out the only real bug was with
PYXIS_BUG_BASE being set incorrectly, and the de driver only functioning
when I set the media type to 100baseTX even though I'm on a 10baseT
network. 

I'm having even more problems with this machine now though. There are some
serious corruption problems.  When I downloaded the install files they all
had crc errors.  So nfs mounted another machine and copied it over.  After
that occasionally when I recompile my kernel I get gcc errors.  Some data
written to .depend was corrupted, and occasionally the assembler reports
invalid input.  Each time after I rerun make it works.  Fsck is also
constantly reporting problems with my disk.  Does anyone know what might
cause this?  I've ruled out hardware errors as other operating systems
have not had these problems.

Thanks,
Jeff