In 1984 Apple Computer unveiled their Macintosh. It included a new user interface that revolutionized the way people though about computer interaction. Originally referred to as simply 'Macintosh System', the underlying OS was a single-tasking disk system for the Motorola 68K CPU. Significant changes were made in MacOS 7.x.

Emulation note: For MacOS 0.x-6.x we recommend the vMac Mini emulator.

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. Presenting Apple Music on Mac. The new Apple Music app is the ultimate music streaming experience on Mac. 1 Explore a library of 60 million songs, discover new artists and tracks, find the perfect playlist, download and listen offline, or enjoy all the music you’ve collected over the years. And find it all in your music library on all your devices.

It is possible to write Macintosh 400k/800k images to a real disk using a Kryoflux.

Note: Wikipedia's/Apple's Developer CD Classic Mac OS 'System Software' numbering scheme is GARBAGE and should NOT be used.

Screenshots

Mac System Software 1.0 Release Date Windows 10

Release notes

System 1.0 (0.97), Finder 1.0 was the first official, stable release. It was released in 1984 with the original Macintosh and ran with 128k RAM, 400k 3.5' floppy drive, monochrome video, and a mouse. It used a flat file system (MFS) that only emulated folders. Officially the System revision was 1.0, but the internal number reported '0.97'.

The Macintosh Guided Tour was also released with the original Macintosh, but contained an earlier System 0.85, Finder 1.0. Notably the finder still had icons of the Twiggy Macintosh!

Windows Terminal 1.0 Release Date

Mac System Software 1.0 Release Date Online

System 1.1, Finder 1.1g improved font support, disk copying, and startup speed.