Transcript No Slide Title

slide 1
Computer System
Input
Devices
System
Unit
Examples?
Storage
Devices
Output
Devices
slide 2
Primary Input Devices
• Keyboard
• Mouse
slide 3
Uses Of Keyboard
• Enter Data
– Alphabets
– Numbers
• Issue Commands
slide 4
Keyboards
slide 5
Parts of Keyboard
Status
Indicators
Numeric
Keypad
Standard
Keyboard
Cursor
Control Keys
slide 6
Standard Keyboard
Standard keyboards of different brands look alike.
slide 7
Standard Keyboard
Alphabetic Keys are arranged like those on a typewriter.
slide 8
Standard Keyboard
Numeric Keys
(Number Row)
slide 9
Standard Keyboard
slide 10
Standard Keyboard
Tab
Caps Lock
• Advances cursor to the next tab stop
•
Capitalise all the alphabets typed
•
Not produce the top symbol on keys
that contain two symbols, eg,
number row
slide 11
Standard Keyboard
Shift
•
Hold down the Shift Key to
capitalise the alphabets typed
•
Produce the top symbol on keys that
contain two symbols
slide 12
Standard Keyboard
Backspace Key deletes
one character to the left
of the cursor.
slide 13
Standard Keyboard
Enter Key
• Advances the insertion
point to the next line
• Used to execute a
command
slide 14
Standard Keyboard
slide 15
Standard Keyboard
Ctrl
Alt
• Used in conjunction with another key to
expand the functionality of the keyboard
• Depends on the software being used
slide 16
Standard Keyboard
slide 17
Standard Keyboard
Esc
• Cancels an operation
Function Keys
• Are numbered and assigned different
functions in different software packages
• Can save keystrokes
slide 18
Numeric Keypad
Numbers can be keyed in by use of
• Numeric Row of Standard Keyboard
• Numeric Keypad
slide 19
Numeric Keypad
Permits rapid numeric data entry
slide 20
Numeric Keypad
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
slide 21
Numeric Keypad
• When Num Lock is
pressed, the numeric
keypad is in numeric
mode and produces
numbers.
• Num Lock light is on.
slide 22
Numeric Keypad
• 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.
slide 23
Toggle Keys
• Switches back and forth between
two modes
• Num Lock, Cap Lock and Scroll
Lock
slide 24
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 25
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 26
Status Indicators
Status Indicators
show the status of
each toggle key:
Num Lock, Caps
Lock and Scroll
Lock.
slide 27
Status Indicators
Scroll
Lock
Num
Lock
Caps Lock
slide 28
Cursor Control Keys
(2)
(1)
slide 29
Cursor Control Keys
2 sets of Cursor Control Keys:
(1) Located between Standard
Keyboard and Numeric Keypad
(2) When the Numeric Keypad is in
cursor control mode
slide 30
Cursor Control Keys
Arrow
Keys
slide 31
Cursor Control Keys
Arrow Keys
• Select options from a menu
• Move cursor up, down, left and right
Delete Key
• Deletes the character at the cursor
position
slide 32
Cursor Control Keys
Insert Key
• A toggle key
• Switches between
typeover mode
insert
mode
and
• Insert mode allows additional text to be
inserted.
• Typeover mode makes the new text type
over the existing text.
slide 33
Cursor Control Keys
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.
slide 34
Cursor Control Keys
Page Up Key
• Displays the previous screen of
information
Page Down Key
• Displays the
information
next
screen
of
slide 35
Other Keys
slide 36
Other Keys
Print Screen Key
• Prints what is currently
displayed on the screen
being
Pause Key
• Temporarily suspend the current task
slide 37
Keyboard
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
slide 38
Keyboard Skills
In order to use the
keyboard efficiently,
users are encouraged to
develop their Keyboard
Skills.