If you are installing System software on a hard disk that will be shared by
different Macintosh models (for instance, both a Macintosh II and a
Macintosh Plus), we suggest installing the System software as if the drive
is going to be used on a Macintosh II.
A Macintosh Plus ignores the information for a Macintosh II, while
providing all the files and resources a Macintosh II will need.
(NOTE: Do not use the minimum Installer scripts for this purpose.)