1. Operating systems This work is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 License. Skills: none IT concepts: popular operating systems, open- source vs proprietary software, operating system functions, device drivers, TCP/IP, virtualization

2. Where does this topic fit? Internet concepts –Applications –Technology –Implications for Internet skills –Application development –Content creation

3. Popular operating systems Windows 7 OS X Linux

4. Popular operating systems Proprietary Microsoft Proprietary Apple Open source

5. Open source Free as in free beer Free as in free speech

6. Main things the operating system does Execute user commands Manage files and their locations in storage Switch the CPU from one program to another Manage memory and storage Interface with hardware devices.

7. Graphical user interface (GUI) Command line user interface (CLI) Execute user commands, delete a file Drag to the recycle bin

8. Execute user commands, run a program

9. Manage data and program files

10. Allocate CPU time Windows task manager: Ctrl+Alt+Del

11. I could be doing a foreground task like word processing or Web surfing at the same time. Transferring two files to another computer at the same time

12. Manage memory, storage and other resources Windows resource manager: Ctrl+Alt+Del > Resource monitor Memory garbage collection Disk swapping Others

13. Slugish PC needs more memory

14. Interface with I/O, storage and other devices

15. You might add new input output and storage devices to your computer after you buy it, so the operating system must be open-ended. New devices come with interface programs called device drivers. Operating system Driver for device 1 Driver for device n Driver for device 2 Driver for device 3... Memory

16. The Internet is essentially a (very big complex) input and output device for a computer connected to it. The interface programs for the Internet have the catchy name TCP/IP. Operating system Driver for device 1 Driver for device n Driver for device 2 Driver for device 3... Memory TCP/IP

17. Device interface programs are called device drivers Interface with the Internet is a suite of programs called TCP/IP TCP/IP is like a device driver for the Internet

18. ProgDoc Operating system 2...ProgDoc Operating system 3...ProgDoc Operating system 1 … Virtualization

19. Windows and Mac OS-X But, virtualization is primarily used on servers.

20. A few questions

21. We covered five of the most important things an operating system does. Without looking back, can you recall what they were?

22. Is a device driver hardware, software, or both? When you purchase a new device like a Web camera, who supplies the device driver? Do popular operating systems like Windows include TCP/IP or must you download and install it before you can connect your computer to the Internet? Device drivers

23. If a vending machine were connected to the Internet, would it need a computer inside? Would it have to run TCP/IP software?

24. There are no applications running, yet 51% of memory is in use. Why is that? There are no applications running, yet 13% of CPU capacity is tied up. Why is that?

25. Operating systems This work is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 License. Skills: none IT concepts: popular operating systems, open- source vs proprietary software, operating system functions, device drivers, TCP/IP, virtualization