System Software (0-6) Pre-Release

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.

Twiggy Mac OS is a development pre-release used with the 5.25" Twiggy prototype Macintosh.

This version will not run on a normal Macintosh or emulator, and used Apple's 5.25" Twiggy floppy disk. A special Twiggy Macintosh emulator is included so you may try it for yourself.

There are also two "Sony Test" pre-releases, that run from a 3.5" disk. One includes a late version of the original Finder prototype renamed as "Flounder".

A detailed review can be found here: Toastytech Apple Macintosh Twiggy Pre-Release

Product type
OS
Vendor
Apple
Release date
1983
Minimum CPU
m68K
Minimum RAM
128KB
User interface
GUI
Platform
MacOS

Downloads

Download Name Version Language CPU File type File size
Apple MacOS Twiggy Pre-Release (5.25-Twiggy) Twiggy Prototype English m68k 5¼ Floppy 428.78KB
Sony Test 6.9 with Flounder 4.4 (3.5-400k) 6.9 English m68k 3½ Floppy 366.93KB
Sony Test 7.0 with Finder 4-Oct-83 (3.5-400k) 7.0 English m68k 3½ Floppy 162.43KB

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