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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
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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
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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?