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3.1 System Software Overview Describe the purpose and functions of an operating system including the basic startup sequence of a computer. Identify the main features of a GUI. Types of Software • • • • Applications software System software Utility programs Library programs 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). GUI • Graphical User Interface • Windows Icon Menu Pointer • Requires less user skill • More user friendly Acronyms • • • • GUI WIMP BIOS CMOS • OS Graphical User Interface Windows Icon Menu Pointer Basic Input/Output System Complementary metal– oxide–semiconductor Operating System Associated words • Operating system Discussion What happens when a computer system is defragmented?