2-3 note. 2 Peripheral Devices “Peripheral devices” are hardware plugged into ports or connected...
-
Upload
morgan-martin -
Category
Documents
-
view
223 -
download
1
Transcript of 2-3 note. 2 Peripheral Devices “Peripheral devices” are hardware plugged into ports or connected...
2-3 note
2
Peripheral Devices• “Peripheral devices” are hardware plugged into
ports or connected to a computer wirelessly.• These devices can be for input, output, or both.• Monitors provide a visual display on a screen.
The two common types of monitors are– cathode-ray tub (CRT)– liquid crystal display (LCD)
• Modems transmit data by converting digital signals to analog signals and vice versa. This allows computers to communicate over phone lines.
• Expansion cards contain chips that add new features to a computer, such as a graphics card.
3
Peripheral Devices(continued)
• Printers print text and graphics on paper. They can be impact or non-impact.
• Pointing devices control the movement of a cursor on the display screen. Examples include the mouse, the trackball, and the touch pad.
• Graphic tablets are a type of pointing device used by graphic designers.
• Gamepads are input devices controlled by a user’s thumbs.
• Keyboards enable users to enter data.
4
Peripheral Devices(continued)
• Speakers allow the output of sound.• Microphones input sound to a computer.• Scanners allow documents and pictures to
be scanned into the computer and to be stored in a digital file.
• Webcams take pictures and videos that can be uploaded to the Web.
5
Computer Software
• Computer software carries out the four functions (input, storage, processing, and output).
• Software is a set of electronic instructions that tell a computer what to do. A computer must have software.
• There are two types of software:1. operating software
2. application software
6
Operating System Software
• The operating system software - recognizes data coming from an input device- sends information to an output device- keeps track of directories and files-controls peripheral devices- responsible for running software and for security.
7
Some popular operating systems are:
Microsoft Windows - for PCs
Mac OS - for Apple computers
Linux - for very large network computers
Handheld operating systems - for PDAs, MP3 players, and cell phones
What Is a GUI?
Nearly all modern operating systems use a graphical user interface (GUI). This lets users click on images or text on the screen instead of having to type commands.
7
8
Application Software
• Application software is designed to allow users to perform specific tasks.
• Application software is categorized by its function:– utility
– productivity (word processing, spreadsheet, database, presentation)
– desktop publishing
– graphics
– Web development
– Internet browser
– computer games
– communications
9
• How Do I Use Software?It is important to choose the right software program for the type of task
you want to do:
9
10
Desktop
• A “desktop” is a computer case designed to sit on your desk.
• It is also the primary screen on your computer.
• The appearance depends on interface:–menu-driven–command-driven
• Most desktops use a graphical user interface (GUI) with windows, icons, and pop-up menus.
11
Typical Desktop Features
• Typical desktop features include
- wallpaper
- icons
- taskbar/menu bar
- windows
- screensaver
12
Computer Communication
• To communicate, computers must be linked via a network.–A network is two or more computers connected
by cable or radio signals.
• A computer that is not part of the network is a called a stand-alone.
• The two advantages of a network are–access to information–access to equipment
13
A network allows you to send data back and forth between different computers, servers, storage devices, and shared output devices:
13
14
Types of Networks
• There are two types of networks:
1. A local area network (LAN) is located in one building.
2. A wide area network (WAN) covers a large geographic area.
• Networks are arranged in two ways:1. client/server
• One computer is the leader, or the server.• The other computers (also called nodes) are clients.
2. peer-to-peer• All computers act as both clients and servers.
15
Network Topologies
• A topology is the physical layout of computers.
• There are two main topologies:1. bus
• All nodes and peripherals are attached to one main cable.
2. star• All nodes and peripherals are attached to a central
hub.