If you are using SUP and not anoncvs to update your source tree, please
fetch and apply the ADB changes from -current:

	ftp://ftp.netbsd.org/pub/NetBSD/arch/mac68k/test/adb.diff

Compiling a new kernel with these changes applied will resolve the
problem.  I intend to pull these up to the release branch after I'm
satisfied that no other problems are uncovered.

--scott