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 Mac OS 8.0 (US English) 1997 Apple Mac OS 8.1 (US English) 1998 Apple