2.0 Basic OS Concept Management

Types of Interfaces

1. Command Interface2. Menu Interface3. Graphical User Interface4. Voice-actuated interface5. Web-form interface

Types of Interface : 1) Command Interface

Types of Interface : 1) Command Interface …cont

An interface that accepts types commands, one line at a time from the user

Contras with a menu – driven interface

E.g.: MS-DOS , UNIX operating system

Types of Interface : 1) Command Interface…cont

Types of Interface : 2) Menu Interface

Types of Interface : 2) Menu Interface…cont

An interface that accept instructions that user choose from menu of valid choice

User often use mouse to point & click on the chosen instruction

Contrast with a command-driven interface

E.g.: Windows 2000

Types of Interface : 2) Menu Interface…cont

Types of Interface : 3) Graphical User Interface

Types of Interface : 3) Graphical User Interface…cont

A user interface that allows the user to activate OS command by clicking on a desktop icon using pointing device such as mouse or touch screen.

GUIs evolved from command –driven user interface.

User often use mouse to point & click on the chosen

Types of Interface : 3) Graphical User Interface…cont

Types of Interface : 4) Voice-Actuated Interface

Enables a user to use simple voice command to control physical environmental.

E.g.: The computer includes a voice card & associated voice recognition & training software for interpreting & translating voice input into digital information readable by controller card for operating equipments @ control the environment.

Types of Interface : 5) Web-form Interface

Types of Interface : 5) Web-form Interface…cont

Allow user to enter data that is send to a server for processing

Web form interface resembles paper form because user need to fill out the form using web form elements

Types of Interface : 5) Web-form Interface…cont

Basic Functions Perform by OS User Interface

1. Enable user to interact with the system

2. How to interact? By perform the user command interface /instructions from various types of interfaces.

3. Medium are used ; display screen, keyboard, mouse, light pen, the appearance of a desktop, illuminated characters or help messages.

Boot Process

Booting up is a bootstrapping process that starts OS when the user turns on a computer system

Booting is the process of starting or restarting a computer

Type of Boot Process

1. Cold Boot

2. Warm Boot

Type of Boot Process : Cold Boot

When turning on a computer that has been powered off completely.

Example : by press power button.

Type of Boot Process : Warm Boot

Is the process of restarting a computer that already is powered on.

Example : In Windows XP, warm boot can be perform by :

pressing combination of (CTRL + ALT +DEL) selecting a button or an option from a list in a

dialog box pressing the reset button on the computer

How a PC Boots Up

1. The power supply send a signal to the component s in the system unit

2. The processor finds the ROM chip(s) that contain the BIOS (basic input output system)

3. The BIOS performs the POST(power-on self test), which checks components such as mouse, keyboard and adapter cards.

4. The results of the POST are compared with data in a CMOS chip

5. The BIOS looks for the system file in drive A (floppy disk drive), sometimes a CD or DVD drive & then drive C (hard disk)

6. The system file and the kernel of the OS load into memory (RAM) from storage (hard disk)

7. The OS loads configuration information, may request user information & display the desktop on the screen.