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.

The game was released in 2017 commercially on Steam by independent developer Undertow Games (Joonas 'Regalis' Rikkonen). Source code was released on 4 June 2017 on GitHub under a restrictive mods allowing license. His previous game, SCP – Containment Breach, is also available as free and open-source software under CC BY-SA license. Version 0.29.8 - OUROBOROS Update September 28, 2020 A good deal of progress has been made for the first wave of Enemies 2.0, but it isn't ready yet. Online FPS game, near future background, Resource Warfare between Military Forces and PMC. More than 50 kinds of original weapons with customization option. Use Peripheral objects, Tactical drones, Active objects to experience dynamic warfare.

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.

Ouroboros Game Guide

Screenshots

Release notes

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.

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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'.

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Ouroboros Game Walkthrough

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