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System Software
Chapter 5
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• Describe the differences between system software and application software
• Discuss the four types of system software• Discuss the basic functions, features, and
categories of operating systems• Describe the Windows,
Mac OS, UNIX, & Linux operating systems
Competencies (Page 1 of 2)
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• Describe the purpose of utilities and utility suites• Identify the five most essential utilities• Discuss Windows utility programs
• Describe device drivers, including printer drivers
Competencies (Page 2 of 2)
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• Handles technical details
• Works with end users, application software, and computer hardware
• Four types of programs– Operating system– Utilities– Device drivers– Language translators
System Software
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• Manage computer resources• Provide an interface between the users and
computer• Runs applications• A collection of programs that handle technical
tasks• Every computer has an operating
system
Operating Systems
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• Performs three types of functions– Manages computer resources
• Coordinate memory, processing storage, and printers• Monitor system performance• Provide security• Start-up the computer
– Provides user interface • Character-based interface• Graphical user interface (GUI)
– Runs applications• Multitasking• Foreground & background applications
Functions of an Operating System
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• Booting • Features in common with application software
– Icons– Pointers– Windows– Menus – Dialog boxes– Help
Features of an Operating System
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• Hundreds of operating systems• Three basic categories
– Embedded operating systems – hand-held
– Network operating systems – linked computers
– Stand-alone operating systems – desktop
Categories of Operating Systems
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• OS often called software environment or platform
• Operating systems commonly used by individuals– Windows – most widely used– Mac OS – powerful and easy to use– UNIX – network; originally designed for Web– LINUX – non proprietary; free from the Web
More on Operating Systems
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• The most popular microcomputer operating system – over 90 percent of the market
• Comes in a variety of different versions• Windows 7
provides several improvements
over Windows Vista
Windows
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• An operating system designed to run on Apple computers
• Not used as widely as Windows• One of the most innovative operating systems
• Mac OS X is one of the latest versions • Mac OS (Boot Camp)
allows the running of both
the Mac OS and Windows
Mac OS
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• UNIX operating system– Originally designed to run on minicomputers on a
network– Used by powerful microcomputers
• LINUX is a version of UNIX– Not proprietary– Open source
UNIX and LINUX
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• Ability to support multiple operating systems on a single physical machine
• Virtualization software– Physical machine can be logically separated
into separate and independent virtual computers called virtual machines
– Host operating system– Guest operating system
Virtualization
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• Specialized programs to make computing easier • Most essential utilities
– Troubleshooting or diagnostic programs– Antivirus programs– Uninstall programs– Backup programs– File compression programs
Utilities
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• Backup and Restore
• Disk Cleanup
• Disk Defragmenter
Windows Utilities
5-15
Accessing Windows Vista utilities:
Click Start, Select All Programs, Select Accessories, Choose System Tools
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• Utility program includedwith many Windowsversions
• Makes a copy of all files or
selected files that have been
saved on a disk• Helps prevent against
disk failure
Backup and Restore
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• Identifies and eliminatesnonessential files
• Frees up valuable space
and improves system
performance
Disk Cleanup
5-17
Return
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Disk Defragmenter
5-18
• Identifies and eliminates unnecessary fragments
• Rearranges files and
unused disk space to
optimize operations• Speeds up file access
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• A group of several utility programs bundled for sale
• Buying the package is economical • Popular suites
– Norton System Works – McAfee Office– V Communications
SystemSuite
Utility Suites
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• Specialized programs that allow communication between a device and the computer
• Loaded into memory eachtime a computer is started
• When a new device is added, new device drivers must be installed
Device Drivers
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Virus Protection and Internet Security
• Internet Security Suite– Runs a number of programs– Continually monitors your
computer• VirusScan
– Controls the frequency of searches for viruses
– Quarantines or deletes infected files
• PrivacyService– Helps protect your privacy
online– Block websites, cookies, and
ads
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