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BTEC National. Unit 2 Computer Systems. Overview of operating system functions . 4. 3. 5. 2. 1. Operating system functions 1. At the very heart of the PC s the actual hardware (layer 1). All other layers act as an interface between the twp layers each side of them.

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Btec national

BTEC National

Unit 2 Computer Systems


Overview of operating system functions

Overview of operating system functions

4

  • 3

5

2

1


Operating system functions 1

Operating system functions 1

At the very heart of the PC s the actual hardware (layer 1). All other layers act as an interface between the twp layers each side of them.

Layer 2 is software that drives the hardware, saving and retrieving data on disk drivers, etc.

Layer 3 is called the kernel. It controls the applications in layer 4 and makes sure there are no conflicts between the applications, e.g. in their requests for data from a disk or sending data to a printer.


Operating systems functions 2

Operating systems functions 2

Layer 4 comprise the applications software. The ones you want to use are loaded into memory and run by the operating system.

Layer 5, is the user interface, sometimes called the HCI(Human Computer Interface), what you see when you look at the screen, and how things that you key are dealt with.


Comparison between functions of different types of operating system 1

Comparison between functions of different types of operating system 1

  • Start-up

  • Security

  • Communication

  • Control of peripherals

  • Control of memory

  • Error control


Comparison between functions of different types of operating system 2

Comparison between functions of different types of operating system 2

  • For s sand-alone single user PC

    • User interface

    • Multi-tasking

    • Data movements to and from disks, and all other peripherals

    • Peripheral management


Operating system installation

Operating system installation

  • You need to be able to install an operating system. This could be any one of the followings:

    • Windows

    • Linux

    • AppleMac OS


Computer operations

Computer operations

You need to use various computer operations on a proprietary operating system.

If you are working on a Windows system, much of the information that the operating system uses can be accessed through the control panel.


Generation of environment and systems for a computer user

Generation of environment and systems for a computer user

When an operating system is first installed, a number of settings are present at default values, and one of these is the configuration.

The system assumes a standard keyboard, standard mouse, etc. so if a user connects a special mouse or a higher resolution screen, telling the operating system is called configuring.

Other default values relate to how the interface between the computer and the user will operate, such as the background colour on the screen or security options such as passwords.


Generation of environment and systems for a computer user1

Generation of environment and systems for a computer user

  • All operating systems allow the user to customise settings, i.e. to set up new default settings that are to apply every time the system is powered up. These can include the following:

    • Set up security passwords

    • Include anti-virus checks

    • Change the screen prompts or desktop appearance

    • Decide mouse settings (speed, pointer style, etc)

    • Provide icons or menus to start software or to open specific files.

    • Select appropriate drivers for printers and other devices.


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