Mac System Software 1.x

Mac System Software 1.x is the first version of the Mac System Software, initially released on 24 January 1984 for the Macintosh, now called the Macintosh 128K or Mac128K. 4 builds of 1.0 have been leaked ranging from a different GUI called "Flounder", to the Finder. Apple released 1.1 with faster Disk Copy speeds and new Special menu commands. It was released on 29 December 1984.