System 7 (codenamed 'Big Bang' and sometimes retrospectively called Mac OS 7) is a single-user graphical user interface-based operating system for Macintosh computers and was part of the classic Mac OS line of operating systems. It was introduced on May 13, 1991, by Apple Computer. It succeeded System 6, and was the main Macintosh operating system until it was succeeded by Mac OS 8 in 1997.

Programma dlya proshivki resivera supermaks. Features added with the System 7 release included virtual memory, personal file sharing, QuickTime, QuickDraw 3D, and an improved user interface. System 7 was the first Apple operating system to be available on CD, although it shipped on a set of 15 floppy disks initially. Unlike earlier systems, System 7 itself did not come bundled with major software packages. Newly purchased Macintosh computers had System 7 installed and were often bundled with software such as HyperCard, At Ease and Mouse Practice.

Later, the Macintosh Performa series added various software bundles including third-party software such as ClarisWorks, The New Grolier Multimedia Encyclopedia, Microsoft Bookshelf, Spectre VR and Power Pete. Since System 7 was introduced before the Internet came to popular attention, software such as MacTCP, FreePPP and Netscape were not included at first, but was later available on disk from Internet service providers and bundled with books such as Adam C. Engst's Internet Starter Kit for Macintosh.

PowerPC Macintoshes included Graphing Calculator. System 7 also included AppleTalk networking and file sharing software in the form of system extensions and control panels.

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