>Anyone built a -current kernel and running it on a Performa 550 or one of
>the adb machines?


Whew!  I thought I was going crazy when I ran into this myself.  It looks 
like some of the sources got messed up in some way.  The current version 
of "macglobals.s" seems to have reverted to a version from the days 
before the Performa-550 worked.  That will probably keep us 550 users 
from running, but it's not the only cause.  I'm still trying to find out 
what other changes there are that are keeping us from running.  The last 
good set of sources I had were from around April 10th.  Does anyone have 
any ideas of what might have changed in the ADB code or mapping routines 
since then?

-bob