If you'd like to set up a minimal (and fast booting!) Mac environment to
boot NetBSD, here's one possibility.  The requirements:

 - Your system must have 32-bit clean ROMs.  Some systems that do not
   are the Macintosh II, IIx, and IIcx models; the `Enable' button for
   32-bit addressing cannot be selected if this is the case.
 - Your system must be supported by System 7.0 (a fair indicator
   that it will -not- run 7.0 is that your machine was shipped with
   a later version installed).
 - Either (8) 800K floppies, or enough RAM to use a utility to mount
   the disk images and run the Installer.

System Software 7.0.1 is available for download from the Apple FTP sites.
No special instructions are necessary beyond what is outlined in the
INSTALL document.  You'll need approximately 10MB of disk to do the Easy
Install; less if you do a Custom Install, but make sure you don't choose
the `Minimum system' option.

For reference, I tested with Booter 1.10, Mkfs 1.44, and Installer 1.1e.

Finally, if anybody has a reference for the old MODE32 -- not the system
7.5-specific version -- please let me know so I can make it available on
the NetBSD FTP site.

--scott

PS - Thanks to this, I now have a recovery disk that I can bring to any of
my machines when I crash them hard due to the kernel work I've been doing.
:-)