Chapter 2: Computer Hardware1 Computer Hardware Chapter 2.

Chapter 2: Computer Hardware 1

Computer Hardware

Chapter 2

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Desktop and Portable Computers

• Desktop Computer

• Portable computer

• Notebook computer

• Tablet computer

• UMPC

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Microprocessor Basics

Microprocessor

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Microprocessor Basics

• Front side bus

• Microprocessor clock

• Word size• Cache

• CISC vs. RISC

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Microprocessor Basics

• Serial processing

• Parallel processing

• Dual core processor

• Hyper-Threading Technology

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Today’s Microprocessors

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Random Access Memory

• Random Access Memory

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Random Access Memory

• Capacitors

• Most RAM is volatile

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Random Access Memory

• RAM capacity is expressed in megabytes or gigabytes

• Personal computers

• Virtual memory

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Random Access Memory

• RAM speed is often expressed in nanoseconds or megahertz– SDRAM

– RDRAM

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Read-Only Memory

• ROM

• ROM BIOS

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EEPROM

• Electrically Erasable Programmable Read-Only Memory

• Permanence

• Power?

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Storage Basics

• Storage medium

• Storage device

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Magnetic Storage

• Magnetic storage

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Magnetic Disk

Hard disk platters and read-write heads are sealed inside the drive case or cartridge to screen out dust and other contaminants.

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• A controller positions the disk and read-write heads to locate data

• Durability?

Magnetic Disk

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Magnetic Disk and Tape Technology

• Floppy disk

• Tape drive

• A tape is a sequential storage medium

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CD and DVD Technology

• Optical storage stores data as microscopic light and dark spots on the disk surface– CD and DVD storage technologies

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CD and DVD Technology

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Solid State Storage

• Solid state storage

• Non-volatile

• Card reader may be required

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Solid State Storage

• USB flash drive

• U3 drive

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Storage Wrap-up

Most desktop computers haveseveral drive bays

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Storage Wrap-up

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Basic Input Devices

• Keyboard

• Pointing device

• Touch screen

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Display Devices

• CRT

• LCD

• Plasma

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Display Devices

• Viewable image size

• Dot pitch

• Viewing angle width

• Refresh rate

• Color depth

• Resolution– VGA, SVGA, XGA, SXGA, UXGA, and

WUXGA

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Display Devices

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Printers

• Ink-jet printer

• A laser printer works like a photocopier

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Printers

• Dot matrix printers

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Installing Peripheral Devices

• Data bus• Expansion cards

– Expansion slot

– PCMCIA slot

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Installing Peripheral Devices

An expansion card slidesinto an expansion slot and is secured with a small screw.

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Installing Peripheral Devices

• Expansion port

• Peripheral device may include the Plug and Play feature, or require a device driver

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Surge Protection and Battery Backup

• Power surge

• Surge strip

• UPS

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Basic Maintenance• Computer component failures can be

caused by manufacturing defects and other circumstances beyond your control

• Keep the keyboard clean

• Clean your computer screen on a regular basis

• Keep the area clean around your computer

• Make sure fans are free of dust

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Troubleshooting and Repair

• Telltale signs that your computer is in trouble– Failure to power up– Loud beep– Blue screen of death

• Help and Support Center

• Safe Mode

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Chapter 2 Complete

Computer Hardware