System Software (0-6) System 1.x

In 1984 Apple Computers unveiled their Macintosh computer. 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.

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.

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!

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

Product type
Release date
Minimum CPU
User interface


Download Name Version Language CPU File type File size
Apple Mac OS (System 0.85 Finder 1.0) (Guided Tour Mac 128k) (Jan 1984) (3.5-400k) S0.85/F1.0 English m68k 3½ Floppy 359.68KB
Apple Mac OS (System 1.0 (.97) Finder 1.0) (Macintosh System Disk) (Jan 1984) (3.5-400k) S1.0(.97)F1.0 English m68k 3½ Floppy 122.26KB
Apple Mac OS (System 1.1 Finder 1.1g) (Macintosh System Disk) (Apr 1984) (3.5-400k) S1.1F1.1g English m68k 3½ Floppy 360.63KB
Apple Mac OS (System 1.1 Finder 1.1g) (Macintosh System Disk) (Apr 1984) [French] (3.5-400k) S1.1F1.1g French m68k 3½ Floppy 148.64KB
Apple Mac OS (System 1.1 Finder 1.1g) Manual (030-0687-B) (1984) S1.1F1.1g English m68k Archive 33.7MB
Apple Mac OS (System 1.1 Finder 1.1h) (Guided Tour Mac 128k) (Apr 1984) [French] (3.5-400k) S1.1F1.1h French m68k 3½ Floppy 135.58KB


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