This page is for listing every single old version of Mac OS (including the versions that aren't even called Mac OS!) up until Mac OS X 10.4 Tiger.
All of these pages will be fairly simple for now and will only be documenting the release dates of the Mac OS versions.
Comprehensive changelogs and lists of differences will come out soon.
Macintosh System Software 1.0-6.0
=== Not Available Yet ===Mac OS 7/System Software 7.0
Mac OS 8
Mac OS 9