Input Devices
EASTWOODS Professional College
Computer is a data-processing machine or, in other words, a
machine for the manipulation of symbols or data.
Typically parts of a Computer1. Hardware or System Unit2.
Monitor
3. Keyboard
4. Mouse
5. AVR (Automatic Voltage Regulator) or UPS (Uninterrupted Power
Supply)
6. Sound Blaster
POST Power On Self Test. Checks some computer hardware or
devices like (disk drives, hard drives, keyboard etc.) if properly
connected to the system unit after booting the computer.Desktop -
The on-screen work area on which windows, icons, menus, and dialog
boxes appear.
Parts of Desktop
1. Taskbar - The bar that contains the Start button and appears
by default at the bottom of the desktop. You can click the taskbar
buttons to switch between programs. 2. Start Menu - displays a menu
that lets you easily access the most useful items on your
computer.3. System Tray is located at the left portioned of
taskbar, displays the system time, icon of programs that are
currently run.4. Icons are graphical representation of files,
folders, drives, and programs.5. Wallpaper colored or graphical
background of the desktop.Software are computer instruction or
data.
Software is divided into two categories.1. Systems Software
includes the operating system and all the utilities that enable the
computer to function.
2. Application Software includes programs that to real work for
users. For example, Word processors, Spreadsheets, and database
management systems all under the category of application
software.Operating Systems are the most important programs that run
on a computer. Manages and coordinates the functions performed by
the computer hardware, including cpu (Central Processing Unit),
input/output devices, and secondary storage devices and
communication and network equipment.Most Commonly used Operating
Systems.1. Microsoft Windows (Windows 98, Windows Me, Windows 2000,
Windows XP, Windows NT, Windows Vista)
2. Linux, Unix3. Mac OS
4. OS/2
5. DOS
6. Xenix
Hardware a System unit peripherals. These are devices attached
inside the system unit. Examples, Video card, Soundcard, Memory
card, CD-Rom/DVD-Rom, Disk Drives, Hard Drives etc.
Input Devices
Input device is any machine that feeds data into a computer.
Example of Input devices
1. Keyboard is an input device consisting of a set of
typewriter-like keys that enable you to enter data into a computer.
Similar to electric-typewriter keyboards but contain addition
keys.
The keys on computer keyboards are often classified as follows:
Alphanumeric keys letter and numbers
Punctuation keys comma, period, semicolon, and so on.
Special keys function keys control keys, arrow keys, Caps Lock,
and so on.
2. Mouse is a device that controls the movement of the cursor of
pointer on a display screen, is a small object you ca roll along a
hard flat surface.
Types of Mouse Mechanical has a rubber or metal ball on its
underside that can roll in all direction.
Optomechanical same as a mechanical mouse, but uses optical
sensors to detect motion of the ball.
Optical uses a laser to detect the mouses movement.3. Trackball
is another pointing device. Essentially, a trackball is a mouse
lying on its back
4. Joystick a lever that moves in all directions and controls
the movement of a pointer or some other display symbols.
5. Digitizing Tablet enables you to enter drawings and sketches
into a computer. Consists of an electronic tablet and a cursor or
pen.
6. Scanners input device that can read text or illustration
printed on paper and translate the information into a form that the
computer can use7. Touch Screen monitor is a type of display screen
that has a touch sensitive transparent panel covering the
screen.
8. Light Pen an input device that utilizes a light sensitive
detector to select objects on a display screen.
Output devices
Output device is any machine capable of representing information
from a computer
Examples of Output devices
1. Monitor is another term for the display screen. The term
monitor, however, usually refers tot the entire box, whereas
display screen can mean just the screen.
Classification of Monitors Based on Color Monochrome monitors
actually display two colors, one for the background and one for the
foreground. The color can be black and white, green and black or
amber and black.
Gray-Scale monitors is a special type of monochrome monitor
capable of displaying different shades of gray. Color Monitors can
display anywhere from 16 to over 1 million different colors
2. Printer a device that prints text or illustrations on paper
and in many cases on transparencies and other media.3. Plotter a
device that draws pictures on paper based on commands from a
computer. Plotters differ from printers in that they draw lines
using a pen.
4. Speaker a device that output sounds.
Wallpaper
Taskbar
System Tray
Start Menu
ICONS
Wallpaper
Taskbar
System Tray
Start Menu
ICONS
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