The document defines input as any data entered into a computer's memory and identifies four types: text, graphics, audio, and video. It explains that input devices allow users to enter data and instructions, and lists common examples like keyboards, mice, microphones, and webcams. The document then provides more details on specific input devices for each type of input: keyboards and barcode readers for text; digital cameras and scanners for graphics; microphones and MIDI keyboards for audio; and digital video cameras, webcams, and CCTV cameras for video. It concludes by defining pointing devices like mice, touchpads, joysticks, trackballs, and gamepads.

1. CHAPTER 2: COMPUTER
SYSTEMS
Hardware

2. At the end of the lesson, student should
be able to:
 Define the meaning of input
 Define the meaning of input devices
 Identify the input devices used for text, graphic,
audio and video

3. Input
 Input is any data and instructions entered into the memory of
a computer
 There are four types of input which are:
Text Graphic
Audio Video

4. Input Devices
 Input device is any hardware component that
allows users to enter data and instructions into a
computer.
 Examples of input devices are:
i) Keyboard
ii) Scanner
iii) Microphone
iv) Mouse
v) Webcam

5. A) Input Devices for Text
Input Device Explanation Picture
Keyboard  Input device that
contains key users press to
enter data and instructions
into a computer
 We can enter data such
as text and commands into
a computer by pressing the
keys on the keyboard
Barcode reader  A barcode reader is a
device that uses a light
source to read bar codes
and then converts them into
digital data that a
computer can process

6. B) Input Devices for Graphics
Input Device Explanation Picture
Digital camera  A digital camera allows you to
take picture and store the
photograph images digitally
Scanner  A scanner is a device that
capture image from photographic
prints, posters, magazines pages
and similar sources for computer
editing and display

7. C) Input Devices for Audio
Input Device Explanation Picture
Microphone  Input device that we used to
record audio or give command to the
computer
MIDI keyboard MIDI keyboard is a musical
instrument that we used to play music

8. D) Input Devices for Video
Input Device Explanation Picture
Digital video  A digital video camera allows us to
camera record full motion and store the
capture motion digital
Webcam A webcam is any video camera that
displays its output on a web page
CCTV A Closed-Circuit Television (CCTV)
video camera is a type of digital
video camera that enables a home or
small business user to capture video
and still images

9. E) Pointing Device
Pointing Device Picture Definition
Mouse  A mouse is a small plastic box with buttons on
top and a rolling ball or optical ‘reader’
underneath
Pointing stick  A pressure-sensitive pointing device shape like
pencil eraser positioned between keys on a
keypad
Touchpad  A small, flat, rectangle pointing device that is
sensitive to pressure and motion device
Joystick  An input device with a vertical lever moved to
control pointing devices or on-screen objects
Trackball  A stationary pointing device with a ball on top
or side
Gamepad  A gamepad is the most common kind of game
controller, held in both hands with thumbs and
fingers used to provide input