System 7, codenamed "Big Bang", and also known as Mac OS 7, is a graphical user interface-based operating system for Macintosh computers and is part of the classic Mac OS series of operating systems. It was introduced on May 13, 1991, by Apple Computer[1] It succeeded System 6, and was the main Macintosh operating system until it was succeeded by Mac OS 8 in 1997. Current for more than six years, System 7 was the longest-lived major version series of the classic Macintosh operating system (to date, only Mac OS X had a longer lifespan). Features added with the System 7 release included virtual memory, personal file sharing, QuickTime, QuickDraw 3D, and an improved user interface.

Quick facts: Developer, OS family, Working state, Source m...
Mac OS 7
Version of the classic Mac OS operating system
Screenshot of Mac OS 7.6.1
DeveloperApple Computer
OS familyMacintosh
Working stateHistoric, not supported
Source modelClosed source
Initial releaseMay 13, 1991; 31 years ago (1991-05-13)
Latest release7.6.1 / April 7, 1997; 25 years ago (1997-04-07)
Kernel typeMonolithic for 68k, nanokernel for PowerPC
LicenseProprietary
Preceded bySystem 6
Succeeded byMac OS 8
Official websiteMac OS Releases at the Wayback Machine (archived April 12, 1997)
TaglineIt's powerful, it's easy to use-it's the new operating system for your Macintosh.
Support status
Historical, unsupported as of May 2001
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With the release of version 7.6 in 1997, Apple officially renamed the operating system "Mac OS", a name that had first appeared on System 7.5.1's boot screen. System 7 was developed for Macs that used the Motorola 680x0 line of processors, but was ported to the PowerPC after Apple adopted the new processor in 1994 with the introduction of the Power Macintosh.

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