When supporting very large numbers of Macintosh users using different
Macintosh models, it may be important to keep the number of variations in
system loads to a minimum. Therefore, it may be advantageous to use common
system software for all the different Macintoshes.
If you are going to choose common system software for Macintosh Plus,
Macintosh SE, and Macintosh II/Macintosh IIx systems, it is best to install
the current system for Macintosh II/Macintosh IIx. This ensures that all
CDEVs usable by the Macintosh Plus, Macintosh SE, and Macintosh II/Macintosh
IIx systems are available.
The patches for the Macintosh Plus, Macintosh SE, and Macintosh II/Macintosh
IIx systems are present regardless of the Macintosh model in which the system
software was installed, and are loaded only as needed.
For example, the Macintosh SE patches are loaded by the system when a
Macintosh SE is used; the Macintosh Plus and Macintosh II/Macintosh IIx
patches are not loaded.
The only penalty for use of the Macintosh II/IIx system will be a slight
increase in the amount of disk space used. Performance will not be affected.