The Power Macintosh 5400/120 requires System 7.5.3 Revision 2. However, Revision 2 is already pre-installed on the hard drive and included in the system software installer on the CD-ROM disc. Since Revision 2 is already installed, you do not need to re-install it using the updater installer. The list of computers that should have Revision 2 installed includes only those computers that need to be updated. It does not include computers that ship with Revision 2 already installed.
This article was published in the Information Alley on 14 June 1996.