Input Devices slide 1 System Unit Output Devices Storage Devices Computer System Examples?

Input Devices

slide 1

System Unit

Output Devices

Storage Devices

Computer System

Examples?

Primary Input Devices

• Keyboard

• Mouse

slide 2

Uses Of Keyboard

• Enter Data– Alphabets

– Numbers

• Issue Commands

slide 3

slide 4

Keyboards

Parts of Keyboard

slide 5

Standard Keyboard

Cursor Control Keys

Status Indicators

NumericKeypad

Standard Keyboard

slide 6

Standard keyboards of different brands look alike.

slide 7

Alphabetic Keys are arranged like those on a typewriter.

Standard Keyboard

slide 8

Numeric Keys(Number Row)

Standard Keyboard

Standard Keyboard

slide 9

Standard Keyboard

slide 10

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

slide 11

Shift• Hold down the Shift Key to

capitalise the alphabets typed

• Produce the top symbol on keys that contain two symbols

Standard Keyboard

slide 12

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

Standard Keyboard

slide 13

Enter Key

• Advances the insertion point to the next line

• Used to execute a command

Standard Keyboard

slide 14

Standard Keyboard

slide 15

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

slide 23

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.

slide 24

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.

slide 25

Status Indicators

slide 26

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

slide 29

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

slide 36

Print Screen Key

• Prints what is currently being displayed on the screen

Pause Key

• Temporarily suspend the current task

slide 37

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

slide 38

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

Keyboard Skills