System Software 6.0.8 1988 Apple System Software 7.0 1991 Apple System Software 7.0.1 1991 Apple System Software 7.1.1 1993 Apple System Software 7.5 1994 Apple System Software 7.5.3 Revision 2 1996 Apple System Software 7.5.5 1996 Apple System Software 7.6 1997 Apple System Software 7.6.1 1997 Apple