It had virtual memory support, built-in cooperative multitasking, and added aliases.
In late 1987, System Software 5 finally allowed Mac users to run more than one application at a time, which System Software 6 improved upon in 1988.īig changes came when System 7 arrived in 1991. System 3 and System 4 were released in 19 and allowed Macintosh computers to work with more external devices. System 2 was released in 1985, and added support for AppleTalk networking protocols. System 1 introduced the menu bar to Apple computers, along with “desk accessory” applications like the Calculator and Alarm Clock.
System 1 helped popularize graphical user interfaces, where people clicked on icons instead of typing in code to use their computer. The Macintosh computer was released in 1984 with an OS known as Macintosh System Software, or System 1.
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