Top Banner
Operating Systems System Software, functions of an operating system
14

Operating Systems

Feb 25, 2016

Download

Documents

simone vieira

Operating Systems . System Software, functions of an operating system . The Operating System . The Operating System is also known as System Software. All computers must have an operating system in order to work The OS is responsible for all the functions of hardware and also software. - PowerPoint PPT Presentation
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Page 1: Operating Systems

Operating Systems System Software, functions of an operating system

Page 2: Operating Systems

The Operating System The Operating System is also

known as System Software.

All computers must have an operating system in order to work

The OS is responsible for all the functions of hardware and also software

Page 3: Operating Systems

Functions of an Operating System

GUI

Device Drivers

Security Networking

Disk Management (File

Systems)

Memory Management

Process Management

Operating System

Page 4: Operating Systems

Process Management A multitasking OS allows the computer to

perform many different tasks(processes) at the same time

The CPU can only focus on one process at a time. The OS tells the CPU to give each process a very short time slice (time slot)

This happens very fast making it seem like the processes are occurring at the same time

Page 5: Operating Systems

Memory Management A computer has different memory

types it could use; memory registers, cache, RAM and disk storage.

The OS is responsible for checking; which memory if free which memory is to be allocated and de- allocated how to swap between the main memory and secondary memory

Page 6: Operating Systems

Memory Management When the OS swaps between main

memory and secondary memory we call this Virtual Memory management

Virtual memory creates a memory slot acting as RAM when the RAM is too full

Virtual memory is much slower than RAM

Page 7: Operating Systems

Disk Management / File SystemsOperating systems have different file

systems.

A file system is an organisation of all the files and folders saved within

the computer

Each OS has a different file system hence a different access system (notes page 29)

Page 8: Operating Systems

Networking Most of the OSs today are

capable of using the universal TCP/IP (Transmission Control Protocol/Internet Protocol)

This allows computers to communicate with each other and be able to share resources such as files and hardware devices over a network, such as Internet.

Page 9: Operating Systems

SecurityThe basic type of security an OS

offers is asking for a Username and Password before a user can use the OS

The OS could also limit certain users from doing certain actions. This is known as level access

The OS uses a Firewall to close certain ports when using TCP/IP protocol

Page 10: Operating Systems

GUI – Graphical User InterfaceMost operating systems use a GUI –

Graphical User interfaces, which is more user-friendly as it uses graphical representations which the user can easily understand.

A GUI's components are Icons, Menus, Windows, Toolbars , Buttons amongst others.

Page 11: Operating Systems

Windows GUI

Page 12: Operating Systems

Linux GUI

Page 13: Operating Systems

MAC GUI

Page 14: Operating Systems

Device Drivers A device driver is software that is

responsible for the communication between different hardware and the computer.

Device drivers are used to let the OS know how a specific hardware works as with all the new advances in technology it is impossible for the OS to know how ALL types of hardware work