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 Developer Transition Kit is the name of two prototype Mac computers made available to software developers by Apple Inc. The first Developer Transition Kit was made available in 2005 prior to the Mac transition to Intel processors to aid in the Mac's transition from PowerPC to Intel's x64 architecture. A second Developer Transition Kit was made available in 2020 prior to the Mac transition to Apple silicon as part of its initiative to transition the Mac away from Intel to Apple's ARM64-based. I remember how stable System 7.6.1 felt, the new UI overhaul in Mac OS 8 which felt so modern, the rocky initial transition to Mac OS X (I ran 10.0 on an iBook and found it to be so unusable I switched back to Mac OS 9 and then went to Mac OS X again with 10.1) that was then resolved and became a solid and fantastic OS. Mac OS X v10.5 in 2007, called Leopard The release of , was meant to be more in synch with the style of other Apple systems, such as iOS and WatchOS. Mac OS X 10.7 in 2011, called Lion. A typical computer prototype is a.horizontal. prototype. It's high-fi in look and feel, but low-fi in depth - there's no backend behind it. Where a human being simulating a paper prototype can generate new content on the fly in response to unexpected user actions, a computer prototype cannot.

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.

Screenshots

Random Computer Prototype Mac Os 8

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.

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'.

Mac Computer

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