On Fri, 23 Jun 2000, Brett Kessler wrote:

> I've seen other references to a "kern_sbc.tgz" file, but I can't seem to
> find it anywhere...

It's just the generic kernel built with sbc scsi instead of nsrscsi.  
It looks like this file is missing in NetBSD-1.4.2, for some reason:

ftp> cd /pub/NetBSD
250 CWD command successful.
ftp> ls */mac68k/binary/sets/kern*
200 PORT command successful.
150 Opening ASCII mode data connection for '/bin/ls'.
NetBSD-1.3.2/mac68k/binary/sets/kern.tgz
NetBSD-1.3.2/mac68k/binary/sets/kern_sbc.tgz
NetBSD-1.3.3/mac68k/binary/sets/kern.tgz
NetBSD-1.3.3/mac68k/binary/sets/kern_sbc.tgz
NetBSD-1.4.1/mac68k/binary/sets/kern.tgz
NetBSD-1.4.1/mac68k/binary/sets/kern_sbc.tgz
NetBSD-1.4.2/mac68k/binary/sets/kern.tgz
NetBSD-1.4/mac68k/binary/sets/kern.tgz
NetBSD-1.4/mac68k/binary/sets/kern_sbc.tgz

But it's just a gzipped tar file containing a single file, the kernel, for
ease of use with the installer.  You can also get the sbc kernel (as you
deduced) from binary/kernel/netbsd.GENERICSBC.gz.  Fortunately the NetBSD
booter can boot from MacOS files (even gzipped ones) as easily as it can
read /netbsd from the root partition of your NetBSD installation (check
the booter manual at 
http://www.netbsd.org/Ports/mac68k/booter-manual/BooterManual.html).
-- 
Tod McQuillin