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Figure 115
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Figure 116
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to watch television and movies Windows XP Tablet PC Edition is a version of Windows XP Professional with additional support for tablet PCs Finally Windows XP Professional x64 is for 64-bit CPUs The current server version is called Windows Server 2003 (Figure 117) It s very similar to Windows 2000 Server but adds a few handy extras that people who run large networks really like Windows 2003 comes in 32-bit and 64-bit versions The latest version of Windows is called Windows Vista (Figure 118) Vista, which comes in multiple versions, is basically a rewritten Windows XP in terms of its structure and
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Figure 117
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11: Installing and Upgrading Windows
function, but it comes with a broad array of new desktop enhancements that improve usability
Apple Macintosh
Apple Computer has a reputation for making great operating systems to run on their computers Macintosh computers were running graphical user interfaces back in the days when PCs were still using DOS, and Microsoft has (arguably) been playing catch up with Apple ever since It s a bit easier for Apple to add features to their computers, since all Apple computers are proprietary There is no one cover name for Macintosh operating systems like Windows Apple just calls their operating systems Mac OS Figure 119 shows the latest version: OS X (pronounced ten, not ex ) Originally, Macs ran on non-Intel CPUs, but starting in 2006, Macs run on Intel CPUs, just like PCs that run Windows Apple always made their own operating systems with names such as System 7, Mac OS 8, and Mac OS 9 However, in 2001 Apple switched to Mac OS X, an OS based on the BSD variant of UNIX Mac OS is now a flavor of UNIX although heavily customized by Apple
Figure 119
Apple s Mac OS X
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UNIX
UNIX is the oldest, most powerful, and most influential operating system ever invented Though old, UNIX has gone through generation after generation of updates and is the operating system chosen by those geeky folks who need detailed control and raw power out of their operating system UNIX was first developed by Bell Labs in the early 1970s and has spawned not only new versions but also entire subclasses of UNIX It s hard to say how many variations of UNIX exist, as sometimes the variations are subtle A good but unscientific guess would be in the area of 500 clearly defined versions! Every popular operating system Windows, Mac OS, even the ancient DOS used concepts from UNIX as a starting point Mac OS may be the leader in cool ways to make an OS user interface, but UNIX has always defined how your OS worked behind the scenes So many things we never think about came from UNIX: hard drive volumes and tree-structured directories are just two of thousands of innovations that come from UNIX So even if you don t use UNIX, many of the aspects of the OS you do use came from UNIX
Linux
Linux is a UNIX clone written by a fellow named Linus Torvalds in 1991, and it has been updated constantly almost daily since then (Figure 1110) Linux was designed from the beginning to run on Intel/AMD processors and has one aspect that makes it unique among popular operating systems it s totally free Not only is it totally free, all of the source code (the actual code the programmers wrote to make Linux) is also freely available to be used and changed The only limitation to changing the source code is that you have to, in turn, make the new code available for free as well Linux uses the GNU general public license (GPL) , a license that uses copyright laws to promote freely available software and keep it free, even when it s changed Linux comes in a variety of flavors that many companies bundle with various applications and make available for purchase or download The Linux part of the bundle is the essential operating system software called the kernel and drivers specific to that kernel for various pieces of hardware The bundled Linux and applications are called Linux distributions (distros) Just as Microsoft bundles useful productivity applications with Windows, such as WordPad and Outlook Express, distro developers bundle all sorts of cool and useful applications with their distro, such as full-featured photo-editing software and complete office suites for word processing, presentation, and number crunching There are quite a few Linux distributions available, but here are a few of the more famous ones:
The GPL is managed by the Free Software Foundation, a nonprofit organization that promotes open-source software
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