Mac System Software 1.x

Mac System Software 1.x
Version of Mac System Software
Preliminary name
Latest build
Release date1984-01-24
Support end1985-04-01
Replaced by
Mac System Software 2.x
Macintosh 128K Twiggy

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.

List of known builds[edit | edit source]

Internal Beta[edit | edit source]

Public Beta[edit | edit source]

RTM[edit | edit source]