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Initial versions of the System Software run one application at a time. With the introduction of System 5, a cooperative multitasking extension called MultiFinder was added, which was later integrated into System 7 as part of the operating system along with support for virtual memory.

It retained most of the user interface design elements of the classic Mac OS, and there was some overlap of application frameworks for compatibility, but the two operating systems otherwise have completely different origins and architectures. The Macintosh project started in late with Jef Raskin , who envisioned an easy-to-use, low-cost computer for the average consumer.

In September , Raskin began looking for an engineer who could put together a prototype. Bill Atkinson , a member of the Apple Lisa team, introduced Raskin to Burrell Smith , a service technician who had been hired earlier that year. Apple's concept for the Macintosh deliberately sought to minimize the user's awareness of the operating system. Many basic tasks that required more operating system knowledge on other systems could be accomplished by mouse gestures and graphic controls on a Macintosh. This would differentiate it from its contemporaries such as MS-DOS , which use a command-line interface consisting of terse, abbreviated textual commands.

In January , Steve Jobs completely took over the Macintosh project. He was able to conserve precious ROM space by writing routines in assembly language code optimized with "hacks," or clever programming tricks. The icons of the operating system, which represent folders and application software , were designed by Susan Kare , who later designed the icons for Microsoft Windows 3.

Apple aggressively advertised their new machine. The Macintosh quickly outsold its more sophisticated but much more expensive predecessor, the Lisa. Apple quickly developed a product named MacWorks , which allowed the Lisa to emulate Macintosh system software through System 3, by which time it had been discontinued as the rebranded Macintosh XL. Many of Lisa's operating system advances would not appear in the Macintosh operating system until System 7 or later. Mac OS 8. The initial purpose of this is to avoid using up the limited storage of floppy disks on system support, given that the early Macs have no hard disk only one model of Mac was ever actually bootable using the ROM alone, the Mac Classic model.

This architecture also allows for a completely graphical OS interface at the lowest level without the need for a text-only console or command-line mode: boot time errors, such as finding no functioning disk drives, are communicated to the user graphically, usually with an icon or the distinctive Chicago bitmap font and a Chime of Death or a series of beeps.

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Several computer manufacturers over the years made Macintosh clones that were capable of running Mac OS. These machines normally ran various versions of classic Mac OS. Steve Jobs ended the clone-licensing program after returning to Apple in Support for Macintosh clones was first exhibited in System 7. These changes were made to disassociate the operating system from Apple's own Macintosh models.

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Both file systems are otherwise compatible. Files in most file systems used with DOS , Windows , Unix , or other operating systems have only one " fork ". The data fork contains the same sort of information as a file in other file systems, such as the text of a document or the bitmaps of an image file. The resource fork contains other structured data such as menu definitions, graphics, sounds, or code segments that would be incorporated into a program's file format on other systems. An executable file might consist only of resources including code segments with an empty data fork, while a data file might have only a data fork with no resource fork.

On the other hand, these forks would provide a challenge to interoperability with other operating systems.

In copying or transferring a Mac OS file to a non-Mac system, the default implementations would simply strip the file of its resource fork. Most data files contained only nonessential information in their resource fork, such as window size and location, but program files would be inoperative without their resources. This necessitated such encoding schemes as BinHex and MacBinary , which allowed a user to encode a dual-forked file into a single stream, or inversely take a single stream so-encoded and reconstitute it into a dual-forked file usable by Mac OS.

As part of Apple's goal of creating a computer with appliance-like simplicity, there is no explicit distinction made between the operating system software and the hardware it runs on. Because of this, early versions of the operating system do not have a distinct name. The software consists of two user-visible files: the System file, and the Finder , an application used for file management that also displays the Desktop.

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  • The two files are contained in a folder directory labeled "System Folder", which contains other resource files, like a printer driver , needed to interact with the System. These releases can only run one application at a time, except for desk accessories, though special application shells such as Multi-Mac [16] or Switcher discussed under MultiFinder could work around this. Visible changes are best reflected in the version number of the Finder , where major leaps are found between 1.

    The software itself was still freely available through user groups and bulletin board services. While the product box presented this update to the operating system as "version 5.

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    Three of the four disks System Tools 1, System Tools 2 and Utilities 1 are all bootable, and the user can boot off of whichever floppy contain the tools the user needs. Because the disks are named System Tools, users and the press commonly referred to this version as "System Tools 5. The primary new feature of System 5 is MultiFinder , an extension which lets the system run several programs at once.

    The system uses a cooperative multitasking model, meaning that time is given to the background applications only when the foreground application yields control. A change in system functions that applications were already calling to handle events make many existing applications share time automatically, as well as being allowed to perform tasks in the background. In InfoWorld tested four multitasking options for PC and Mac, viewing MultiFinder positively overall, but noting that its presence halved the speed of file transfer and printing compared to the single-tasking System 6 without MultiFinder.

    System Software 6 also referred to as "System 6" is a consolidation release of the Macintosh system software, producing a complete, stable, and long-lasting operating system.

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    Two major hardware introductions requiring additional support under System 6 are the processor and 1. Later updates include support for the first specialized laptop features with the introduction of the Macintosh Portable. From System 6 forward, the Finder has a unified version number closely matching that of the System, alleviating much of the confusion caused by the often considerable differences between earlier Systems.

    On May 13, , System 7 was released. It is a major upgrade over System 6, adding a significant user interface overhaul, new applications, stability improvements and many new features.

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    Its introduction coincides with the release of and provided support for the Macintosh line. The System 7 era saw numerous changes in the Macintosh platform including a proliferation of Macintosh models , the 68k to Power Macintosh transition as well as the rise of Microsoft Windows , increasing use of computer networking and the explosion in popularity of the Internet. One of the most significant features of System 7 is virtual memory support, an essential subsystem anticipated for years, which only exists for previous Systems in a third party extension named Virtual from Connectix.

    This change is known as being "bit clean". While System 7 itself is bit clean, many existing machines and thousands of applications were not, so it was some time before the process was completed. To ease the transition, the "Memory" control panel contains a switch to disable this feature, allowing for compatibility with older applications.

    Another notable System 7 feature is built-in cooperative multitasking. In System Software 6, this function was optional through the MultiFinder. System extensions were enhanced by being moved to their own subfolder; a subfolder in the System Folder was also created for the control panels.

    In System 7. The Apple menu, home only to desk accessories in System 6, was made more general-purpose: the user could now make often-used folders and applications—or anything else they desired—appear in the menu by placing aliases to them in an "Apple Menu Items" subfolder of the System Folder. System 7 also introduced the following: AppleScript , a scripting language for automating tasks; bit QuickDraw , supporting so-called "true color" imaging, previously available as a system extension; and TrueType , an outline font standard.

    The Trash, under System 6 and earlier, empties itself automatically when shutting down the computer—or, if MultiFinder is not running, when launching an application. System 7 reimplements the Trash as a special hidden folder, allowing files to remain in it across reboots until the user deliberately chose the "Empty Trash" command. System 7.

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    One of the major new features of System 7. This leads to extra files inside the system folder one per new model supported. These issues do not affect 68k-architecture machines. Mac OS 7.

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    It was mainly released to keep the Mac OS moving forward during a difficult time for Apple. Initially planned as Mac OS 7. Mac OS 8 added a number of features from the abandoned Copland project, while leaving the underlying operating system unchanged.