Released: October 1987System Requirements: 68000 processor or later, 1 MB of RAMDistribution Media: 800k Floppy disksApple Order Number: n/aVersions: System Software 5.0 (System File 4.2, Finder 6.0, MultiFinder 1.0), System Software 5.1 (System File 4.3, Finder 6.0, MultiFinder 1.0)History: System 5 added MultiFinder, an add-on replacement for the Finder which could run several programs at once. Time was given to the background applications only when the foreground (or "running") applications gave it up (cooperative multitasking), but in fact most of them did via a clever change on the OS's event handling. The other significant change that System 5 brought to the Mac was Color QuickDraw, which debuted with the Macintosh II. This significantly altered the extent and design of the underlying graphics architecture (and its APIs), but it is a credit to Apple that most users, and perhaps more importantly existing code, were largely unaware of this. System 5 was also the first Macintosh operating system to be given a unified "Macintosh System Software" version number, as opposed to the numbers used for the System and Finder files.History Source: WikipediaHistory Source Address: http://en.wikipedia.org/wiki/Mac_OS_historyHistory License: GNU Free Documentation License
