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Development[ edit ] The development of the Macintosh system software up to System 6 followed a fairly smooth progression with the addition of new features and relatively small changes and upgrades over time. Major additions were fairly limited, notably adding Color QuickDraw in System 6.
Some perspective on the scope of the changes can be seen by examining the official system documentation, Inside Macintosh. This initially shipped in three volumes, adding another to describe the changes introduced with the Mac Plus and another for the Mac II and Mac SE.
That is, the machine was geared towards a single user and task running on a floppy disk based machine of extremely limited RAM. However, many of the assumptions of this model were no longer appropriate.
Most notable among these was the single-tasking model, the replacement of which had first been examined in 's "Switcher" and then replaced outright with MultiFinder in System 5.
Running MultiFinder normally required larger amount of RAM and a hard drivebut these were becoming common by the late s.
While additions had been relatively limited, so had fixes to some of the underlying oddities of the system architecture.
For instance, to support a limited form of multitasking, the original Mac OS supported small co-resident programs known as desk accessories which had to be installed into the system using special tools. If the system were able to support multiple tasks, this one-off solution would no longer be needed — desk accessories could simply be small programs, placed anywhere.
Yet, as MultiFinder was still optional, such a step had not been taken. Numerous examples of this sort of problem could be found throughout the system. Finally, the widespread adoption of hard drives and local area networks led to any number of new features being requested from users and developers.
By the late s, the list of new upgrades and suggested changes to the existing model was considerable. Pink and Blue[ edit ] In March[N 1] shortly before the release of System 6, technical middle managers at Apple held an offsite meeting to plan the future course of Mac OS development.
As Blue was aimed at relatively "simple" upgrades, the feature list reads to some degree as a sort of "System 6, corrected". In the underlying OS, a number of formerly optional components were made mandatory: The new APIs featured significantly improved hardware abstractionas well as higher-quality playback.
Although technically not a new feature for System 7 these features were available for System 6. System 7 paved the way for a full bit address space, from the previous bit address space. This change was known as being "bit clean".
While System 7 itself was 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 contained a switch to disable this feature, allowing for compatibility with older applications but rendering any RAM over 8 MB unusable.
Furthermore, a number of oddities in the original System, typically included due to limited resources, were finally changed to use basic underlying OS features: Trash was now a normal directory, allowing items to be preserved between reboots and disk eject events instead of being purged.
There was an auto-routing feature for extensions, control panels, fonts and Desk Accessories where they could simply be dropped onto the System folder. The system would detect the type and automatically place the moved files in the appropriate subdirectories. On reboot, the System would read the files and install the extensions, without the user having to do anything else.
Additionally, all extensions and panels see below could be temporarily disabled by holding down the shift key when booting up.
Extensions were often a source of instability and these changes made them more manageable and assisted trouble-shooting. Similarly, the Control Panel desk accessory became the Control Panels folder found in the System Folder, and accessible to the user from an alias in the Apple menu.
The control panels themselves became separate files, stored within this directory. Control panels are essentially system extensions with a user interface. The Apple menu previously home only to desk accessories pulled from "DRVR" resources in the System file now listed the contents of a folder "Apple Menu Items"including aliases see below.
Desk accessories had originally been intended to provide a form of multitasking and were no longer necessary now that real multitasking was always enabled.
The desk-accessory technology was deprecated, with System 7 treating them largely the same as other applications.To create a business WordPress website, you first need a hosting plan. We recommend Bluehost because they combine everything into one package (website, domain AND professional email accounts) starting at just $/month..
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It was introduced on May 13, , by Apple Computer, Inc. It succeeded System 6, and was the main Macintosh operating system until it was succeeded by Mac OS 8 in Download all the business icons you need.
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