The document discusses computer operating systems. It defines an operating system as software that enables computer hardware to communicate and operate with computer software. It notes operating systems manage processors, memory, disks and other components. The document then describes types of operating systems including graphical user interfaces (GUI), multi-user, multiprocessing, multitasking and multithreading operating systems. It provides examples like Windows, Linux and Unix. The document also lists many past and present operating systems and includes their release dates and platforms.

1. Computer Operating Systems Computer Hardware Servicing NC II Guevarra Institute of Technology Gingoog City, Philippines

2. A. Definition “An operating system, or OS, is a software program that enables the computer hardware to communicate and operate with the computer software. Without a computer operating system, a computer would be useless” ( ‘Operating System 2009’)

3. A layer of software that manages processors, memory, disks, printers, keyboard , display, network interfaces , input/output devices and provide user programs with a simpler interface to the hadware. ( Tanendaum )

4. http://www.comptechdoc.org/basic/basictut/osint.gif

5. B. Types ( ‘Operating System 2009’) GUI - Short for Graphical User Interface, a GUI Operating System contains graphics and icons and is commonly navigated by using a computer mouse.

6. Examples of GUI OS System 7.x http://www.computerhope.com/macos.htm

7. 2. Multi-user - A multi-user operating system allows for multiple users to use the same computer at the same time and/or different times.

8. Examples of Multi User Linux http://www.pcstats.com/articleimages/200503/linux2_susemain.jpg

9. 2. Unix http://mitglied.lycos.de/deloreswims32/images/1-1024x768.jpg

10. 3. Windows 2000 http://www.intelliadmin.com/images/Windows%202000%20Screen%20Shot.jpg

11. 3. Multiprocessing – An operating system capable of supporting and utilizing more than one computer processor. Below are some examples of multiprocessing operating systems. LinuxUnix Windows 2000

12. 4. Multitasking - An operating system that is capable of allowing multiple software processes to run at the same time. Below are some examples of multitasking operating systems. Unix Windows 2000

13. 5.Multithreading - Operating systems that allow different parts of a software program to run concurrently. Operating systems that would fall into this category are: LinuxUnix Windows 2000

14. C. Operating System Listing Here is a listing of many of the different types of operating systems available today, the dates they were released, the platforms they have been developed for and who developed them.

15. D. Troubleshooting Common questions and answers to operating systems in general can be found on the below operating system question and answers . All other questions relating to an operating system in particular can be found through the operating system page.

16. Linux / Variants MacOS MS-DOS IBM OS/2 Warp Unix / Variants Windows CE Windows 3.x Windows 95 Windows 98Windows 98 SE Windows ME Windows NT Windows 2000 Windows XP Windows Vista

17. References 'Operating Systems' 2009, Computer Hope , viewed 18 June 2009 http://www.computerhope.com/os.htm Tanenbaum, A., Modern Operating Systems , Prentice Hall.