Seems that NetBSD/mac68k no longer works with system 6.  Installing
system 7 and Mode32 is an easy fix.  Allen, who happens to be my neighbor,
helped me get system 7 onto the machine (I have it on the HD media, but my 
Mac II has only a DD drive).  It's now chugging along with NetBSD 1.1 just
fine.

Allen says "I would like to know why it doesn't work with system 6, but I 
don't care enough to really track it down."  My sentiments exactly...

Thanks also to Ken Nakata...

--Carl