Mac OS is the trademarked name for a series of graphical user interface-based operating systems developed by Apple Inc. (formerly Apple Computer, Inc. An operating system (commonly abbreviated OS and O/S) is the software component of a Computer system that is responsible for the management and coordination Apple Inc, ( formerly Apple Computer Inc, is an American Multinational corporation with a focus on designing and manufacturing Consumer electronics ) for their Macintosh line of computer systems. Macintosh, commonly nicknamed Mac is a Brand name which covers several lines of Personal computers designed developed and marketed by Apple Inc A computer is a Machine that manipulates data according to a list of instructions. The Macintosh user experience is credited with popularizing the graphical user interface. The original form of what Apple would later name the "Mac OS" was the integral and unnamed system software first introduced in 1984 with the original Macintosh, usually referred to simply as the System software. Year 1984 ( MCMLXXXIV) was a Leap year starting on Sunday (link displays the 1984 Gregorian calendar) The Macintosh is the original Apple Macintosh Personal computer.
Apple deliberately downplayed the existence of the operating system in the early years of the Macintosh to help make the machine appear more user-friendly and to distance it from other operating systems such as MS-DOS, which were portrayed as arcane and technically challenging. MS-DOS (short for M icro' s' oft D isk O perating S ystem is an Operating system commercialized by Microsoft. Much of this early system software was held in ROM, with updates typically provided free of charge by Apple dealers on floppy disk. As increasing disk storage capacity and performance gradually eliminated the need for fixing much of an advanced GUI operating system in ROM, Apple explored cloning while positioning major operating system upgrades as separate revenue-generating products, first with System 7 and System 7. 5, then with Mac OS 7. 6 in 1997.
Earlier versions of the Mac OS were compatible only with Motorola 68000-based Macintoshes. The Motorola 68000 is a 16/32-bit CISC Microprocessor core designed and marketed by Freescale Semiconductor (formerly Motorola Semiconductor As Apple introduced computers with PowerPC hardware, the OS was upgraded to support this architecture as well. PowerPC is a RISC Instruction set architecture created by the 1991 Apple – IBM – Motorola alliance known as AIM Mac OS X, which has superseded the "Classic" Mac OS, is compatible with both PowerPC and Intel processors.
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Versions
The early Macintosh operating system initially consisted of two pieces of software, called "System" and "Finder", each with its own version number. [1] System 7.5.1 was the first to include the Mac OS logo (a variation on the original "Happy Mac" smiley face Finder startup icon), and Mac OS 7. System 7 (codenamed "Big Bang" and sometimes called Mac OS 7) is a single-user Graphical user interface -based Operating system for Macintosh The smiley, smiley face, or happy face, is a stylized representation of a smiling human face commonly represented as a yellow circle with two dots representing 6 was the first to be named "Mac OS" (to ensure that users would still identify it with Apple, even when used in "clones" from other companies).
Until the advent of the later PowerPC G3-based systems, significant parts of the system were stored in physical ROM on the motherboard. PowerPC G3 is a designation used by Apple Computer to a third generation of PowerPC Microprocessors from the PowerPC 750 family designed The initial purpose of this was to avoid using up the limited storage of floppy disks on system support, given that the early Macs had no hard disk. A floppy disk is an increasingly Obsolete data storage medium that is composed of a disk of thin flexible ("floppy" Magnetic storage medium encased A hard disk drive ( HDD) commonly referred to as a hard drive, hard disk, or fixed disk drive, is a Non-volatile storage device (Only one model of Mac was ever actually bootable using the ROM alone, the 1991 Mac Classic model. The Macintosh Classic was a Personal computer manufactured by Apple Computer. ) This architecture also allowed for a completely graphical OS interface at the lowest level without the need for a text-only console or command-line mode. A fatal software error, or even a low-level hardware error discovered during system startup (such as finding no functioning disk drives), was communicated to the user graphically using some combination of icons, alert box windows, buttons, a mouse pointer, and the distinctive Chicago bitmap font. Mac OS depended on this core system software in ROM on the motherboard, a fact that later helped to ensure that only Apple computers or licensed clones (with the copyright-protected ROMs from Apple) could run Mac OS.
The Mac OS can be divided into two families of operating systems:
- "Classic" Mac OS, the system which shipped with the first Macintosh in 1984 and its descendants, culminating with Mac OS 9. Mac OS 9 is the final major release of Apple's "Classic" Mac OS.
- The newer Mac OS X (where the X is 10 written as a Roman numeral). Mac OS X (mæk oʊ ɛs tɛn is a line of computer Operating systems developed marketed and sold by Apple Inc, the latest of which is pre-loaded on all currently Roman numerals are a Numeral system originating in ancient Rome, adapted from Etruscan numerals. Mac OS X incorporates elements of OpenStep (thus also BSD Unix and Mach) and Mac OS 9. OpenStep is an Object-oriented Application programming interface (API specification for an Object-oriented operating system that uses any modern Operating Mach is an Operating system Microkernel developed at Carnegie Mellon University to support operating system research primarily distributed and parallel Mac OS 9 is the final major release of Apple's "Classic" Mac OS. Its low-level BSD-based foundation, Darwin, is free software/open source software. Darwin is an open source UNIX -based computer Operating system released by Apple Inc Free software or software libre is Software that can be used studied and modified without restriction and which can be copied and redistributed in modified or unmodified Open source software (OSS began as a marketing campaign for Free software.
"Classic" Mac OS (1984–2001)
The "classic" Mac OS is characterized by its total lack of a command line; it is a completely graphical operating system. On January 24, 1984, Apple Computer Inc (now Apple Inc) introduced the Apple Macintosh Personal computer, with the Macintosh 128K Heralded for its ease of use and its cooperative multitasking, it was criticized for its very limited memory management, lack of protected memory, and susceptibility to conflicts among operating system "extensions" that provide additional functionality (such as networking) or support for a particular device. In computing Multitasking is a method by which multiple tasks also known as processes, share common processing resources such as a CPU. Historically the Mac OS used a form of Memory management that has fallen out of favour in modern systems Memory protection is a way to control memory usage on a computer and is core to virtually every Operating system. Some extensions may not work properly together, or work only when loaded in a particular order. Troubleshooting Mac OS extensions can be a time-consuming process of trial and error. Trial and error, or trial by error, is a general method of Problem solving for obtaining Knowledge, both Propositional knowledge and Know-how
The Macintosh originally used the Macintosh File System (MFS), a flat file system with only one level of folders. Macintosh File System ( MFS) is a volume format (or disk File system) created by Apple Computer for storing files on 400K Floppy disks In Computing, a file system (often also written as filesystem) is a method for storing and organizing Computer files and the data they contain to make This was quickly replaced in 1985 by the Hierarchical File System (HFS), which had a true directory tree. Year 1985 ( MCMLXXXV) was a Common year starting on Tuesday (link displays 1985 Gregorian calendar) Hierarchical File System ( HFS) is a File system developed by Apple Inc In Computing, a directory, catalog, folder or drawer is an entity in a File system, which contains a group of files and/or other directories Both file systems are otherwise compatible.
Most file systems used with DOS, Unix, or other operating systems treat a file as simply a sequence of bytes, requiring an application to know which bytes represented what type of information. Extension conflicts were sometimes a problem on Apple Macintosh computers running versions of Mac OS prior to X, especially System 7. Mac OS 9 is the final major release of Apple's "Classic" Mac OS. By contrast, MFS and HFS gave files two different "forks". The data fork contained the same sort of information as other file systems, such as the text of a document or the bitmaps of an image file. The resource fork contained other structured data such as menu definitions, graphics, sounds, or code segments. The resource fork is a construct of the Mac OS Operating system used to store structured data in a file alongside unstructured data stored within the data fork A file might consist only of resources with an empty data fork, or only a data fork with no resource fork. A text file could contain its text in the data fork and styling information in the resource fork, so that an application, which didn’t recognize the styling information, could still read the raw text. On the other hand, these forks provided a challenge to interoperability with other operating systems; copying a file from a Mac to a non-Mac system would strip it of its resource fork.
Classic Application Support was shipped with Mac OS X with PowerPC (but not Intel) Macs until early 2006. However, Intel-based Macintoshes cannot run the Classic system or applications, nor can PowerPC models while they are running Mac OS 10. 5 Leopard.
Mac OS X (2000–present)
Mac OS X brought Unix-style memory management and pre-emptive multitasking to the Mac platform. Mac OS X (mæk oʊ ɛs tɛn is a line of computer Operating systems developed marketed and sold by Apple Inc, the latest of which is pre-loaded on all currently Pre-emption or preemption in Computing is the act of temporarily interrupting a task being carried out by a computer system, without requiring It is based on the Mach kernel and the BSD implementation of UNIX, which were incorporated into NeXTSTEP, the object-oriented operating system developed by Steve Jobs' NeXT company. Mach is an Operating system Microkernel developed at Carnegie Mellon University to support operating system research primarily distributed and parallel Unix (officially trademarked as UNIX, sometimes also written as Unix with Small caps) is a computer Nextstep was the original object-oriented, multitasking Operating system that NeXT Computer developed to run on its range of proprietary computers An object-oriented operating system is an Operating system which internally uses object-oriented methodologies. Steven Paul Jobs (born February 24 1955 is the Co-founder, Chairman, and CEO of Apple Inc and former CEO of Pixar Animation NeXT Computer Inc (later NeXT Software Inc) was an American Computer company headquartered in Redwood City, California that The new memory management system allowed more programs to run at once and virtually eliminated the possibility of one program crashing another. It is also the second Macintosh operating system to include a command line (the first is the now-discontinued A/UX, which supported classic Mac OS applications on top of a UNIX kernel), although it is never seen unless the user launches a terminal emulator. A/UX (from A pple U ni' x') was Apple Computer 's implementation of the Unix Operating system for some of their Macintosh A terminal emulator, terminal application, term, or tty for short is a program that emulates a "dumb" video terminal within some other
However, since these new features put higher demands on system resources, Mac OS X only officially supported the PowerPC G3 and newer processors, and now has even higher requirements (the additional requirement of built-in USB (10.3) and later FireWire (10.4)). PowerPC G3 is a designation used by Apple Computer to a third generation of PowerPC Microprocessors from the PowerPC 750 family designed Mac OS X version 103 “Panther” was the fourth major release of Mac OS X, Apple’s desktop and server Operating system. The IEEE 1394 interface is a serial bus Interface standard for high-speed communications and Isochronous real-time data transfer frequently Mac OS X version 104 “Tiger” was the fifth major release of Mac OS X, Apple’s desktop and server Operating system for Macintosh Even then, it runs somewhat slowly on older G3 systems for many purposes.
For over three years, Mac OS X has gotten faster with every release - faster on the same hardware. Mac OS X (mæk oʊ ɛs tɛn is a line of computer Operating systems developed marketed and sold by Apple Inc, the latest of which is pre-loaded on all currently [2]
PowerPC builds of Mac OS X include a compatibility layer for running older Mac applications, the Classic Environment. This runs a full copy of the older Mac OS, version 9. 1 or later, in a Mac OS X process. PowerPC-based Macs shipped with Mac OS 9. 2 as well as Mac OS X. Mac OS 9. 2 had to be installed by the user — it was not installed by default on hardware revisions released after the release of Mac OS X 10.4. Mac OS X version 104 “Tiger” was the fifth major release of Mac OS X, Apple’s desktop and server Operating system for Macintosh Most well-written "classic" applications function properly under this environment, but compatibility is only assured if the software was written to be unaware of the actual hardware, and to interact solely with the operating system. The Classic Environment is not available on Intel-based Macintoshes due to the incompatibility of Mac OS 9 with the x86 hardware, and was removed completely on Mac OS X 10.5. Mac OS 9 is the final major release of Apple's "Classic" Mac OS. Mac OS X version 105 “Leopard” is the sixth major release of Mac OS X, Apple’s desktop and server Operating system for Macintosh
Users of the classic Mac OS generally upgraded to Mac OS X, but many criticized it as being more difficult and less user-friendly than the original Mac OS, for the lack of certain features that had not been re-implemented in the new OS, or for being slower on the same hardware (especially older hardware), or other, sometimes serious incompatibilities with the older OS. Because drivers (for printers, scanners, tablets, etc. ) written for the older Mac OS are not compatible with Mac OS X, and due to the lack of Mac OS X support for older Apple machines, a significant number of Macintosh users have still continued using the older classic Mac OS. But by 2005, it has been reported that almost all users of systems capable of running Mac OS X are doing so, with only a small fraction still running the classic Mac OS.
In June 2005, Steve Jobs announced at the Worldwide Developers Conference keynote that Apple computers would be transitioning from PowerPC to Intel processors. Steven Paul Jobs (born February 24 1955 is the Co-founder, Chairman, and CEO of Apple Inc and former CEO of Pixar Animation At the same conference, Jobs announced Developer Transition Kits that included beta versions of Apple software including Mac OS X that developers could use to test their applications as they ported them to run on Intel-powered Macs. In January 2006, Apple released the first Macintosh computers with Intel processors, an iMac and the MacBook Pro, and in February 2006, Apple released a Mac mini with an Intel Core Solo and Duo processor. The iMac is a desktop Macintosh computer designed and built by Apple Inc The MacBook Pro is a line of Macintosh portable Computers by Apple Inc The Mac Mini (officially capitalized Mac mini) is a desktop computer made by Apple Inc On May 16, 2006, Apple released the MacBook, before completing the Intel transition on August 7 with the Mac Pro. Events 1204 - Baldwin IX Count of Flanders is crowned as the first Emperor of the Latin Empire. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. The MacBook is a Macintosh Notebook computer by Apple Inc that replaced the iBook G4 series Events 322 BC - Battle of Crannon between Athens and Macedon following the death of Alexander the Great. The Mac Pro is a Workstation computer manufactured by Apple Inc To ease the transition for early buyers of the new machines, Intel-based Macs include an emulation technology called Rosetta, which allows them to run (at reduced speed) pre-existing Mac OS X native application software that was compiled only for PowerPC-based Macintoshes. Rosetta is a lightweight dynamic translator for Mac OS X distributed by Apple.
Star Trek
One interesting historical aspect of the classic Mac OS was a relatively unknown secret prototype Apple started work on in 1992, code-named "Star Trek" (as in "to boldly go"). Star Trek was the code name given to a Prototype project at Apple Computer during 1992 and 1993 The goal of this project was to create a version of Mac OS that would run on Intel-compatible x86 personal computers. See also X86 assembly language The generic term x86 refers to the most commercially successful Instruction set architecture in the history of Personal The project was instigated by Novell, Inc. , who were looking to integrate their DR-DOS with the Mac OS UI as a retort to Microsoft's Windows 3. Microsoft Corporation is an American multinational Computer technology Corporation, which rose to dominate the Home computer 0. The Apple/Novell team (fourteen engineers from the former, four from the latter) was able to get the Macintosh Finder and some basic applications, like QuickTime, running smoothly on a PC. The Finder is the default application program used on the Mac OS and Mac OS X Operating systems that is responsible for the overall user-management QuickTime is a Multimedia framework developed by Apple Inc, capable of handling various formats of Digital video, Media clips sound text Some of the code from this effort was reused when porting the Mac OS later to PowerPC. [3]
The project was short lived, being canceled only one year later in early 1993. There are two theories for the cancellation: the first is that Apple's board deep-sixed further development upon realising that going with Star Trek would mean an entirely new business model and one that would likely see a notable drop in Apple's lucrative hardware sales; and the second is that an x86 Mac OS was not commercially viable in the early nineties because Microsoft's contracts for Windows 3. Microsoft Corporation is an American multinational Computer technology Corporation, which rose to dominate the Home computer 1 forced PC manufacturers to pay a royalty to Microsoft for every computer shipped, regardless of what operating system it contained.
A further complication was that Star Trek was designed to be source-level compatible, not binary compatible, with the Mac OS. Mac applications would therefore have to be recompiled or rewritten by their developers to run on the x86 architecture, and there was much skepticism as to exactly how much work this would entail.
Fifteen years after Star Trek, support for the x86 architecture was officially included in Mac OS, and then Apple transitioned all desktop computers to the x86 architecture. The Apple Intel transition was the process of changing the CPU of Macintosh Computers from PowerPC processors to Intel X86 This was not the direct result of earlier Project Star Trek efforts. The Darwin underpinning used for Mac OS X 10. Darwin is an open source UNIX -based computer Operating system released by Apple Inc 0 and later included support for the x86 architecture. The remaining non-Darwin portion of the Mac OS was released officially with the introduction of x86 Macintosh computers.
68000 emulation
Although the Star Trek software was never released, third-party Macintosh emulators, such as vMac, Basilisk II, and Executor, eventually made it possible to run the classic Mac OS on Intel-based PCs. Star Trek was the code name given to a Prototype project at Apple Computer during 1992 and 1993 An emulator duplicates (provides an emulation of the functions of one System using a different system so that the second system behaves like (and appears to vMac is an open source Emulator for Mac OS, Windows, MS-DOS, OS/2, NeXTSTEP, Linux / Unix, and other Basilisk II is an Open source Software Emulator which emulates the 680x0 -based Apple Macintosh computer on a variety of Operating Executor is software for x86 -based PCs that allows older 68k -based Apple Macintosh These emulators were restricted to emulating the 68000 series of processors, and as such most couldn't run versions of the Mac OS that succeeded 8. The Motorola 68000 is a 16/32-bit CISC Microprocessor core designed and marketed by Freescale Semiconductor (formerly Motorola Semiconductor 1, which required PowerPC processors. Most also required a Mac ROM image or a hardware interface supporting a real Mac ROM chip; those requiring an image are of dubious legal standing as the ROM image may infringe on Apple's intellectual property.
A notable exception was the Executor commercial software product from Abacus Research & Development, the only product that exclusively used 100% reverse engineered code without the use of Apple technology. It ran extremely fast but never achieved more than a minor subset of functionality. Few programs were completely compatible and many were extremely crash-prone if they ran at all. Executor filled a niche market for porting 68000 classic Mac applications to x86 platforms; development ceased in 2002 and the project is now defunct.
Emulators using Mac ROM images offered near complete Mac OS compatibility and later versions offered excellent performance as modern x86 processor performance increased exponentially.
Unfortunately most of the Mac user base had already started moving to the PowerPC platform that offered excellent classic Mac backward compatibility on 8. xx & 9. xx operating systems along with faster PowerPC software support. This helped ease the transition to PowerPC-only applications while prematurely obsolescing 68000 emulators and the Classic-only applications they supported well before these emulators were refined enough to compete with a real Mac.
PowerPC emulation
At the time of 68000-emulator development PowerPC support was difficult to justify not only due to the emulation code itself but also the anticipated wide performance overhead of an emulated PowerPC architecture vs. a real PowerPC based Mac. This would later prove correct with the start of the PearPC project even years later despite the availability of 7th & 8th generation x86 processors employing similar architecture paradigms present in the PowerPC. Many application developers were also creating and releasing both 68000 Classic and PowerPC versions concurrently helping to negate the need for PowerPC emulation. PowerPC Mac users who could technically run either obviously chose the faster PowerPC applications. Soon Apple was no longer selling 68000-based Macs and the existing installed base started to quickly evaporate. Despite the eventual excellent 68000-emulation technology available they proved never to be even a minor threat to real Macs due to their late arrival and immaturity even several years after the release of much more compelling PowerPC based Macs.
The PearPC emulator is capable of emulating the PowerPC processors required by newer versions of the Mac OS (like Mac OS X). PearPC is an architecture-independent PowerPC platform Emulator capable of running many PowerPC Operating systems, including Mac OS X PowerPC is a RISC Instruction set architecture created by the 1991 Apple – IBM – Motorola alliance known as AIM Mac OS X (mæk oʊ ɛs tɛn is a line of computer Operating systems developed marketed and sold by Apple Inc, the latest of which is pre-loaded on all currently Unfortunately, it is still in the early stages and, like many emulators, tends to run much slower than a native operating system would. An operating system (commonly abbreviated OS and O/S) is the software component of a Computer system that is responsible for the management and coordination
During the transition from PowerPC to Intel processors, Apple realized the need to incorporate a PowerPC emulator into Mac OS X in order to protect its customers' investments in software designed to run on the PowerPC. Apple's solution is an emulator called Rosetta. Rosetta is a lightweight dynamic translator for Mac OS X distributed by Apple. Prior to the announcement of Rosetta, industry observers assumed that any PowerPC emulator running on an x86 processor would suffer a heavy performance penalty (e. g. , PearPC's slow performance). Rosetta's relatively minor performance penalty therefore took many by surprise.
Another PowerPC emulator is SheepShaver, which has been around since 1998 for BeOS on the PowerPC platform, but in 2002 was open sourced with porting efforts beginning to get it to run on other platforms. SheepShaver is an Open source PowerPC Apple Macintosh Emulator originally designed for BeOS and Linux. Year 1998 ( MCMXCVIII) was a Common year starting on Thursday (link will display full 1998 Gregorian calendar) BeOS is an Operating system for Personal computers which began development by Be Inc See also 2002 (disambiguation Year 2002 ( MMII) was a Common year starting on Tuesday of the Gregorian calendar. Open source is a development methodology which offers practical accessibility to a product's source (goods and knowledge Originally it was not designed for use on x86 platforms and required an actual PowerPC processor present in the machine it was running on similar to a hypervisor. In Computing, a hypervisor, also called virtual machine monitor, is a virtualization platform that allows multiple Operating systems to run on Although it provides PowerPC processor support, it can only run up to Mac OS 9.0.4 because it does not emulate a memory management unit. Mac OS 9 is the final major release of Apple's "Classic" Mac OS. A memory management unit ( MMU) sometimes called paged memory management unit ( PMMU) is a Computer hardware component responsible for handling
Other examples include ShapeShifter (by the same programmer that conceived SheepShaver), Fusion and iFusion. SheepShaver is an Open source PowerPC Apple Macintosh Emulator originally designed for BeOS and Linux. The latter ran classic Mac OS with a PowerPC "coprocessor" accelerator card. Using this method has been said to equal or better the speed of a Macintosh with the same processor, especially with respect to the m68k series due to real Macs running in MMU trap mode, hampering performance. The Motorola 68000 is a 16/32-bit CISC Microprocessor core designed and marketed by Freescale Semiconductor (formerly Motorola Semiconductor A memory management unit ( MMU) sometimes called paged memory management unit ( PMMU) is a Computer hardware component responsible for handling
Macintosh clones
Several computer manufacturers over the years have made Macintosh clones capable of running Mac OS, notably Power Computing, UMAX and Motorola. A Macintosh clone is a personal computer made by a manufacturer other than Apple, using (or compatible with Macintosh ROMs and System software A Macintosh clone is a personal computer made by a manufacturer other than Apple, using (or compatible with Macintosh ROMs and System software Power Computing Corporation (often referred to as Power Computing) was the first company selected by Apple Computer to create Macintosh -compatible UMAX Technologies (originally UMAX Computer Corporation) is a manufacturer of computer products including Scanners mice, and Flash drives based Motorola Inc ( is an American, multinational Fortune 100, Telecommunications company based in Schaumburg Illinois. These machines normally ran various versions of classic Mac OS. Steve Jobs ended the clone-licensing program after returning to Apple in 1997. Steven Paul Jobs (born February 24 1955 is the Co-founder, Chairman, and CEO of Apple Inc and former CEO of Pixar Animation
In 2008, a manufacturing company in Miami, FL called Psystar Corporation, announced a $399 clone that comes with a barebones system that can run Mac OS X 10.5. Psystar Corporation is a Florida-based electronics company which sells surveillance communication and most popularly "Open Computers" made popular by the option to pre-install Mac OS X version 105 “Leopard” is the sixth major release of Mac OS X, Apple’s desktop and server Operating system for Macintosh Threatened with legal battles, Psystar originally called the system OpenMac and have since changed it to Open Computer.
A/UX
In 1988, Apple released its first UNIX-based OS, A/UX, which was a UNIX operating system with the Mac OS look and feel. A/UX (from A pple U ni' x') was Apple Computer 's implementation of the Unix Operating system for some of their Macintosh A/UX (from A pple U ni' x') was Apple Computer 's implementation of the Unix Operating system for some of their Macintosh An operating system (commonly abbreviated OS and O/S) is the software component of a Computer system that is responsible for the management and coordination It was not very competitive for its time, due in part to the crowded Unix market. A/UX had most of its success in sales to the U.S. government, where UNIX was a requirement that Mac OS could not meet. The federal government of the United States is the central United States Governmental body established by the United States Constitution.
Graphical timeline
References
External links
- Mac OS X – Official site
- Mac 101 – Apple's introductory guide the Mac OS.
- Folklore.org – A site of anecdotes shared by the creators of the first Macintosh. For other uses see Anecdota. For a comparison of anecdote with other kinds of stories see Myth legend fairy tale and fable.
- History of Mac OS – Chronicle of version to version changes from the first release to version 10. 4
- The Vintage Mac Museum: – Old Mac System - From System1 to System7
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