Post on 15-Dec-2015
Chapter 2: Computer Hardware 1
Computer Hardware
Chapter 2
Chapter 2: Computer Hardware 2
Desktop and Portable Computers
• Desktop Computer
• Portable computer
• Notebook computer
• Tablet computer
• UMPC
Chapter 2: Computer Hardware 3
Microprocessor Basics
Microprocessor
Chapter 2: Computer Hardware 4
Microprocessor Basics
• Front side bus
• Microprocessor clock
• Word size• Cache
• CISC vs. RISC
Chapter 2: Computer Hardware 5
Microprocessor Basics
• Serial processing
• Parallel processing
• Dual core processor
• Hyper-Threading Technology
Chapter 2: Computer Hardware 6
Today’s Microprocessors
Chapter 2: Computer Hardware 7
Random Access Memory
• Random Access Memory
Chapter 2: Computer Hardware 8
Random Access Memory
• Capacitors
• Most RAM is volatile
Chapter 2: Computer Hardware 9
Random Access Memory
• RAM capacity is expressed in megabytes or gigabytes
• Personal computers
• Virtual memory
Chapter 2: Computer Hardware 10
Random Access Memory
• RAM speed is often expressed in nanoseconds or megahertz– SDRAM
– RDRAM
Chapter 2: Computer Hardware 11
Read-Only Memory
• ROM
• ROM BIOS
Chapter 2: Computer Hardware 12
EEPROM
• Electrically Erasable Programmable Read-Only Memory
• Permanence
• Power?
Chapter 2: Computer Hardware 13
Storage Basics
• Storage medium
• Storage device
Chapter 2: Computer Hardware 14
Magnetic Storage
• Magnetic storage
Chapter 2: Computer Hardware 15
Magnetic Disk
Hard disk platters and read-write heads are sealed inside the drive case or cartridge to screen out dust and other contaminants.
Chapter 2: Computer Hardware 16
• A controller positions the disk and read-write heads to locate data
• Durability?
Magnetic Disk
Chapter 2: Computer Hardware 17
Magnetic Disk and Tape Technology
• Floppy disk
• Tape drive
• A tape is a sequential storage medium
Chapter 2: Computer Hardware 18
CD and DVD Technology
• Optical storage stores data as microscopic light and dark spots on the disk surface– CD and DVD storage technologies
Chapter 2: Computer Hardware 19
CD and DVD Technology
Chapter 2: Computer Hardware 20
Solid State Storage
• Solid state storage
• Non-volatile
• Card reader may be required
Chapter 2: Computer Hardware 21
Solid State Storage
• USB flash drive
• U3 drive
Chapter 2: Computer Hardware 22
Storage Wrap-up
Most desktop computers haveseveral drive bays
Chapter 2: Computer Hardware 23
Storage Wrap-up
Chapter 2: Computer Hardware 24
Basic Input Devices
• Keyboard
• Pointing device
• Touch screen
Chapter 2: Computer Hardware 25
Display Devices
• CRT
• LCD
• Plasma
Chapter 2: Computer Hardware 26
Display Devices
• Viewable image size
• Dot pitch
• Viewing angle width
• Refresh rate
• Color depth
• Resolution– VGA, SVGA, XGA, SXGA, UXGA, and
WUXGA
Chapter 2: Computer Hardware 27
Display Devices
Chapter 2: Computer Hardware 28
Printers
• Ink-jet printer
• A laser printer works like a photocopier
Chapter 2: Computer Hardware 29
Printers
• Dot matrix printers
Chapter 2: Computer Hardware 30
Installing Peripheral Devices
• Data bus• Expansion cards
– Expansion slot
– PCMCIA slot
Chapter 2: Computer Hardware 31
Installing Peripheral Devices
An expansion card slidesinto an expansion slot and is secured with a small screw.
Chapter 2: Computer Hardware 32
Installing Peripheral Devices
• Expansion port
• Peripheral device may include the Plug and Play feature, or require a device driver
Chapter 2: Computer Hardware 33
Surge Protection and Battery Backup
• Power surge
• Surge strip
• UPS
Chapter 2: Computer Hardware 34
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
Chapter 2: Computer Hardware 35
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
Chapter 2: Computer Hardware 36
Chapter 2 Complete
Computer Hardware