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 Software", 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.

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This is a pre-release of Apple MacOS used with the 5.25" Twiggy prototype Macintosh.


Category: Operating System
Platform: MacOS
Release: 1983
End of Life: Unknown
RAM: 128 KB
Disk Space: Unknown
Required CPU: m68K
Type: Graphical



Name Version Size Language Architecture Contents
Apple MacOS Twiggy Pre-Release (5.25-Twiggy)  Twiggy Prototype 428.78 KB English m68k 5.25" Floppy
Sony Test 6.9 with Flounder 4.4 (3.5-400k)  6.9 366.93 KB English m68k 3.5" Floppy
Sony Test 7.0 with Finder 4-Oct-83 (3.5-400k)  7.0 162.43 KB English m68k 3.5" Floppy