1. Systems Software / The Operating System CSC 101 1.0 October 14, 2010

2. What is Software? Intangible A file Performs tasks / jobs A set of instruction Run/executed by the Central Processing Unit (CPU) Must be in the computer’s memory to run

3. Two Types of Software Systems Software Applications Software

4. What is Systems Software Controls the system – Hardware – Software – Input / Output (I/O) Middle man Comprised of – Operating system (OS) – Utility Programs

5. Platform Computer processor & operating system

6. Flavor Version of an operating system

7. Systems Software Programs Mainframe computers – Unix Desktop / Laptop computers – Windows – Mac OSX – Linux

8. Unix Bell AT&T labs - 1969 Runs on large computers

9. Windows Microsoft Bill Gates Leading market share Windows 3.1 Windows 9 Windows 98 Windows ME Windows 2000 Windows NT Windows XP Windows Vista Windows 7

10. Mac OSX Apple Computers Steve Jobs Control hardware & software Based on Unix

11. Linux Linus Tovalds - 1991 Open source Based on Unix Free Distros

12. Operating System Parts Kernel – Heart of the operating system – Must be in memory while the computer is running – All the important tasks the OS must do User Interface – How a human gives commands to the OS

13. Types of Operating Systems Classify by Users – Single User – Multiple User Classify by Task – Single Task – Multitasking Real-time Systems

14. Operating System Jobs Controls the hardware Controls all the other software programs

15. Managing the Processor Controls the timing of events the processor works on REQUEST Operating System

16. Managing Memory The operating system allocates space in RAM for instructions and data RAM Operating System

17. Managing Peripheral Devices Co-ordinates system hardware Device drivers – Small programs – How to communicate with a device Plug and Play – Device device drivers included with systems software – Makes devices immediately usable

18. Managing Storage Handles where files are placed on a storage device Retrieves files from storage device & puts them in memory Remembers file details File allocation table / File allocation system

19. Application Software Interface Requests made by application programs to the OS – Save a document – Print a document – Open a document – Send an e-mail – Play a song

20. User Interface Enables you to interact with the computer Types of interfaces: – Command-driven interface – Menu-driven interface – Graphical user interface

21. Utility Programs Additional small programs Maybe added on later Help with maintenance Make the computer easier to use – Task Scheduler – Defrag – Screen savers – Install/ uninstall wizard

22. The Boot Process Step 1: The basic input/output system (BIOS) is activated Step 2: A power-on self-test (POST) checks attached hardware Step 3: The operating system loads into RAM Step 4: Configuration and customization settings are checked