Mac System Software 1.x

Mac System Software 1.0 was released on 1984-01-24 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 1984-12-29.