Intro Ch 07 A
- 1. McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
- 2. Chapter 7A Operating System Basics
- 3. Functions of Operating Systems Provide a user interface Run programs Manage hardware devices Organized file storage
- 4. Types of Operating Systems Real-time operating system Very fast small OS Built into a device Respond quickly to user input MP3 players, Medical devices
- 5. Types of Operating Systems Single user/Single tasking OS One user works on the system Performs one task at a time MS-DOS and Palm OS Take up little space on disk Run on inexpensive computers
- 6. Types of Operating Systems Single user/Multitasking OS User performs many tasks at once Most common form of OS Windows XP and OS X Require expensive computers Tend to be complex
- 7. Types of Operating Systems Multi user/Multitasking OS Many users connect to one computer Each user has a unique session UNIX, Linux, and VMS Maintenance can be easy Requires a powerful computer
- 8. Multi user/Multi tasking OS
- 9. Providing a User Interface User interface How a user interacts with a computer Require different skill sets
- 10. Providing a User Interface Graphical user interface (GUI) Most common interface Windows, OS X, Gnome, KDE Uses a mouse to control objects Uses a desktop metaphor Shortcuts open programs or documents Open documents have additional objects Task switching Dialog boxes allow directed input
- 12. Providing a User Interface Command line interfaces Older interface DOS, Linux, UNIX User types commands at a prompt User must remember all commands Included in all GUIs
- 14. Running Programs Many different applications supported System call Provides consistent access to OS features Share information between programs Copy and paste Object Linking and Embedding
- 15. Managing Hardware Programs need to access hardware Interrupts CPU is stopped Hardware device is accessed Device drivers control the hardware
- 16. Organizing Files and Folders Organized storage Long file names Folders can be created and nested All storage devices work consistently
- 17. Enhancing an OS Utilities Provide services not included with OS Goes beyond the four functions Firewall, anti-virus and compression Prices vary
- 18. Enhancing an OS Backup software Archives files onto removable media Ensures data integrity Most OS include a backup package Many third party packages exist
- 19. Backup Software
- 20. Enhancing an OS Anti-virus software Crucial utility Finds, blocks and removes viruses Must be updated regularly McAfee and Norton Anti-Virus
- 21. Enhancing an OS Firewall Crucial utility Protects your computer from intruders Makes computer invisible to hackers Zone Labs is a home firewall Cisco sells hardware firewalls
- 22. Enhancing an OS Intrusion detection Often part of a firewall package Announces attempts to breach security Snort is a Linux based package
- 23. Enhancing an OS Screen savers Crucial utility for command line systems Prevents burn in Merely fun for GUI systems Screen saver decorates idle screens
- 24. Chapter 7A End of Chapter