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2.0 Basic OS ConceptManagement

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Types of Interfaces

1. Command Interface

2. Menu Interface

3. Graphical User Interface

4. Voice-actuated interface

5. Web-form interface

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Types of Interface :1) Command Interface

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Types of Interface :1) Command Interface cont

y An interface that accepts types commands, one lineat a time from the user

y Contras with a menu driven interface

y

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

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Types of Interface :1) Command Interfacecont

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Types of Interface :2) Menu Interface

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Types of Interface :2) Menu Interfacecont

y An interface that accept instructions that userchoose from menu of valid choice

y User often use mouse to point & click on the choseninstruction

y Contrast with a command-driven interface

y E.g.: Windows 2000

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Types of Interface :2) Menu Interfacecont

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Types of Interface :3) Graphical User Interface

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Types of Interface :3) Graphical User Interfacecont

y Auser interface that allows the user to activate OScommand by clicking on a desktop icon usingpointing device such as mouse or touch screen.

y GUIs evolved from command driven userinterface.

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

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Types of Interface :3) Graphical User Interfacecont

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Types of Interface :4) Voice-Actuated Interface

y Enables a user to use simple voice command tocontrol physical environmental.

y E.g.: The computer includes a voice card &associated voice recognition & training software forinterpreting & translating voice input into digitalinformation readable by controller card for

operating equipments @ control the environment.

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Types of Interface :5) Web-form Interface

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Types of Interface :5) Web-form Interfacecont

y Allow user to enter data that is send to a server forprocessing

y Web form interface resembles paper form becauseuser need to fill out the form using web formelements

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Types of Interface :5) Web-form Interfacecont

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Basic Functions Perform byOS User Interface

1. Enable user to interact with the system

2. How to interact? By perform the user command

interface /instructions from various types ofinterfaces.

3. Medium are used ; display screen, keyboard,

mouse, light pen, the appearance of a desktop,illuminated characters or help messages.

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Boot Process

y Booting up is a bootstrapping process that starts OS whenthe user turns on a computer system

y Booting is the process of starting or restarting a computer

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Type of Boot Process

1. Cold Boot

2. Warm Boot

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Type of Boot Process : Cold Boot

y When turning on a computer that has beenpowered off completely.

y Example : by press power button.

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Type of Boot Process :Warm Boot

y Is the process of restarting a computer that alreadyis powered on.

y Example : In Windows XP, warm boot can beperform 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

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How a PC Boots Up

1. The power supplysend a signal to the component s inthe system unit

2. The processor finds the ROM chip(s) that contain theBIOS (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 aCMOS chip

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

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

7. The OS loads configuration information, mayrequest user information & display the desktop onthe screen.