Chapter 4. Hardware and Multimedia. Objectives. Explain differences between Mac and Windows computers Describe input and output devices Compare types of storage devices Describe processing components Discuss how computers are connected. Personal Computers (PCs).
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Chapter 4 Hardware and Multimedia
Objectives • Explain differences between Mac and Windows computers • Describe input and output devices • Compare types of storage devices • Describe processing components • Discuss how computers are connected
Personal Computers (PCs) • PCs are computers that can be: • Used by individuals at home, work, or school • Desktop models or portable laptop models • Also hand held models - pda • Connected to a server in a network • Server – computer that manages files and other resources for a network • What is the difference between Mac and PC? • The operating system
What are operating systems? • Operating systems enable computers to run software and perform basic tasks.
PC Operating Systems • One of the principal differences among computers is the operating system. • Most personal computers use Windows or Macintosh (Mac OS) operating systems. • Windows and Mac OS operating systems are not compatible. • Therefore, the hardware that they use may or may not be compatible
Types of Hardware • Input • Output • Storage • Other…
What is input? • Input is any information put into a computer.
Input vs. Output • Input Device • Anything that lets you tell the computer what to do • Output Device • What the computer gives you back • Examples…
Input Devices • Common input devices are: • Keyboards and keypads • Mice, trackballs, and touchpads • Microphones, digital recorders, synthesizers, and musical keyboards • Digital still cameras, digital camcorders, and Webcams • Graphics tablets and scanners • Game controllers
Scanners and Cameras • Allows you to add images • OCR • Optical Character Recognition • scan in documents • Flatbed = more reliable results • Cameras • Less than 3.0 Meg not good for printing
Output Devices • Output is any information that a computer produces. Common output devices are: • CRT (desktop) or LCD (laptop) monitors • Touch screens, plasma displays, LED displays, and projectors • Ink-jet or laser printers • Speakers
Some other terms • Peripherals • Hardware that attaches to your PC • System Unit • “Tower” • Desktop • Laptop
Storage Memory Floppy Disks CD’s Communication Modem Wireless Card Cable Modem The other stuff…
Storage Devices • Digital storage devices allow you to save your work. Common storage devices are: • Hard drives, which are built in the computer • Removable storage disks • CDs • DVDs • floppy disks • Zip disks • memory cards
Floppy Disks Store 1.44 MB CD’s Store 650 MB DVD’s 17 GB Key Drives, ROM, RAM, Memory cards Vary Storage media
What do all those numbers mean? 433 MB Processor • 40 gig hard drive • 1.2 Gig Hertz • 1.44 Megabytes • 3.2 Mega Pixel 40 Gig Hard Drive Megabyte Megahertz Gig Hertz 52 K Modem
Gig – Billion Mega – Million Kilo – Thousand Hertz Measure of Speed Byte Packet of information Pixel Little spots of color on a picture Numbers (cont.)
Processing Components • Processing includes all the calculations and other operations a computer performs. It depends on: • Microprocessors, or chips • A central processing unit (CPU) • Random-access memory (RAM)
CPU • Controls computers logic and its ability to carry out instructions from software • Typically a single chip • Part of the motherboard
Other Chips • Other chips on the motherboard: • RAM – random access memory • What is active while you are using the data • Also known as temporary memory • New pc’s usually have 256 MB or more • More ram = more tasks computer can perform at once
Computer Networks • In order to exchange files and share resources, computers: • Require special input and output devices • Must be part of a network, such as: • The Internet • Local area networks (LANs) • Wide area networks (WANs)
Connecting to Networks • Computers can be linked to the Internet or a network through: • A dial-up or broadband connection using a modem • A network interface card (NIC) • A router
Broadband • DSL • Digital Subscriber lines • Range usually of about 3 miles (if its clear) • Benefits • Always on • Much faster
Modems For dialup – uses telephone line For broadband – uses cable or satellite modem For wireless connections Use cell phone technology Network cards Need network interface card to connect to a network Need Routers to connect two or more LANs Devices for Communications
Objectives Revisited • Explain differences between Mac and Windows computers • Describe input and output devices • Compare types of storage devices • Describe processing components • Discuss how computers are connected