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3.1 System Software

3.1 System Software. Overview. Describe the purpose and functions of an operating system including the basic start-up sequence of a computer. Identify the main features of a GUI. Types of Software. Applications software System software Utility programs Library programs.

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3.1 System Software

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  1. 3.1 System Software

  2. Overview Describe the purpose and functions of an operating system including the basic start-up sequence of a computer. Identify the main features of a GUI.

  3. Types of Software • Applications software • System software • Utility programs • Library programs

  4. Start-up sequence of a computer • The computer is first turned on. • It loads the programming code and instructions on the BIOS chip into memory. • It carries out the instructions in the order the system performs. • The BIOS program then does a simple memory check. • It then compares the information it has gathered with the information stored in the CMOS chip's setup program. If there are problems it halts the program. • It then locates the Operating System. • It loads the OS into RAM (Random Access Memory).

  5. Graphical User Interface Windows Icon Menu Pointer Requires less user skill More user friendly GUI

  6. Acronyms • GUI Graphical User Interface • WIMP Windows Icon Menu Pointer • BIOS Basic Input/Output System • CMOS Complementary metal– oxide–semiconductor • OS Operating System

  7. Associated words • Operating system

  8. Discussion What happens when a computer system is defragmented?

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