Input Devices

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System Unit

Output Devices

Storage Devices

Computer System

Examples?

Primary Input Devices

• Keyboard

• Mouse

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Uses Of Keyboard

• Enter Data– Alphabets

– Numbers

• Issue Commands

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slide 4

Keyboards

Parts of Keyboard

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Standard Keyboard

Cursor Control Keys

Status Indicators

NumericKeypad

Standard Keyboard

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Standard keyboards of different brands look alike.

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Alphabetic Keys are arranged like those on a typewriter.

Standard Keyboard

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Numeric Keys(Number Row)

Standard Keyboard

Standard Keyboard

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Standard Keyboard

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Tab • Advances cursor to the next tab stop

Caps Lock • Capitalise all the alphabets typed

• Not produce the top symbol on keys that contain two symbols, eg, number row

Standard Keyboard

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Shift• Hold down the Shift Key to

capitalise the alphabets typed

• Produce the top symbol on keys that contain two symbols

Standard Keyboard

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Backspace Key deletes one character to the left of the cursor.

Standard Keyboard

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Enter Key

• Advances the insertion point to the next line

• Used to execute a command

Standard Keyboard

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Standard Keyboard

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Ctrl Alt

• Used in conjunction with another key to expand the functionality of the keyboard

• Depends on the software being used

Standard Keyboard

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Standard Keyboard

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Esc

• Cancels an operation

Function Keys

• Are numbered and assigned different functions in different software packages

• Can save keystrokes

Numeric Keypadslide 18

Numbers can be keyed in by use of • Numeric Row of Standard Keyboard• Numeric Keypad

Numeric Keypadslide 19

Permits rapid numeric data entry

Numeric Keypad

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If a key has two symbols, it serves two functions:

(1) numeric key

(2) cursor control key

Switch between 2 functions by use of Num Lock key

Numeric Keypad

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• When Num Lock is pressed, the numeric keypad is in numeric mode and produces numbers.

• Num Lock light is on.

Numeric Keypad

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• When Num Lock is pressed again, the numeric keypad turns to cursor control mode and moves the cursor in the direction indicated by the arrows.

• Num Lock light is off.

Toggle Keys

• Switches back and forth between two modes

• Num Lock, Cap Lock and Scroll Lock

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Toggle Keys - Cap Lock

• Switches between uppercase mode and lowercase mode

• When Cap Lock is pressed, user toggles into uppercase mode.

• When Cap Lock is pressed again, user toggles back into lowercase mode.

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Toggle Keys - Scroll Lock

• The function of the Scroll Lock key depends on the software being used.

• It is rarely used with today’s software.

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Status Indicators

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Status Indicators show the status of each toggle key: Num Lock, Caps Lock and Scroll Lock.

Status Indicatorsslide 27

Num Lock

Scroll Lock

Caps Lock

Cursor Control Keys

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(1)

(2)

Cursor Control Keys

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2 sets of Cursor Control Keys:

(1) Located between Standard Keyboard and Numeric Keypad

(2) When the Numeric Keypad is in cursor control mode

Cursor Control Keys

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Arrow Keys

Cursor Control Keysslide 31

Arrow Keys

• Select options from a menu

• Move cursor up, down, left and right

Delete Key

• Deletes the character at the cursor position

Cursor Control Keysslide 32

Insert Key• A toggle key

• Switches between insert mode and typeover mode

• Insert mode allows additional text to be inserted.

• Typeover mode makes the new text type over the existing text.

Cursor Control Keysslide 33

Home Key

• Moves cursor to the beginning of a line or the beginning of a document, depending on the software being used.

End Key

• Moves cursor to the end of the line or the end of a document, depending on the software being used.

Cursor Control Keysslide 34

Page Up Key

• Displays the previous screen of information

Page Down Key

• Displays the next screen of information

Other Keys

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Other Keys

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Print Screen Key

• Prints what is currently being displayed on the screen

Pause Key

• Temporarily suspend the current task

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Provides three basic ways for issuing commands:

(1) Key in the command using the alphanumeric portion of the keyboard

(2) Tap a function key

(3) Use the arrow keys to select a menu option from the displayed menu

Keyboard

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In order to use the keyboard efficiently, users are encouraged to develop their Keyboard Skills.

Keyboard Skills