Mac OS X Lion (version 10.7) is the eighth major release of Mac OS X (now named macOS), Apple's desktop and server operating system for Macintosh computers. A preview of Mac OS X 10.7 Lion was publicly shown at the 'Back to the Mac' Apple Special Event on October 20, 2010. It brought many developments made in Apple's iOS, such as an easily navigable display of installed applications, to the.

Mac OS 7 was a major change from the earlier System Software, introducing integrated multitasking, a revamped desktop, networking, and transitioning the name from 'Macintosh System Software' To 'MacOS'. It was followed by by MacOS 8.x.

Running Mac OS 7.x requires a Motorola 68000 based Macintosh, a supported model of Power PC based Macintosh (7.1 or later) or one of the following emulators:

Mini vMac - Runs MacOS 1.1-7.5.5, emulates a black and white Motorola 68K based Mac Plus

Basilisk II - Runs MacOS 7.x-8.1, emulates later color Motorola 68k based Macs.

SheepShaver - Runs MacOS 7.5.2-9.0.4, emulates a Power PC based Macintosh.

Screenshots

Release notes

An interim catchup release in the wake of Windows 95, bundling some extra desk accessories, more hardware support, and new APIs such as the modernized Open Transport.

Installation instructions

Testgen Application

Note: Some of these CD images are actually hard disk volumes. You can mount those in an emulator, or some older CD burning programs know how to write them as a CD/ISO.

Testgen Program

7.5.5 is the last supported version on Mac Plus, XL, Mac II, IIx, LC, IIcx, and SE/30, or anything with less than 68030 and 32-bit clean ROM.