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Hardware Needs Software to Work Hardware

Physical components of a computer

Visible part of a system

Software Set of instructions that directs hardware to

accomplish a task

The intelligence

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Functions of a Computer

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PC Hardware Components

Outside computer case: input/output devices

Inside the case: processing and storage CPU – most important component

Requirements of a hardware device Method for CPU to communicate with it

Software to instruct and control it

Electricity to power it

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Hardware Used for Input and Output Connects to computer case by ports (eg, serial,

parallel, USB, game, keyboard, mouse) Popular input devices:

Keyboard Mouse

Popular output devices: Monitor Printer

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Ports

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Input Devices

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Output Devices

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Hardware Inside the Case

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Motherboard Components

Processing CPU (most important) Chip set

Temporary storage RAM Cache memory

Electrical system Power supply

connections

Communication with other devices

Traces Expansion slots System clock

Programming/setup data Flash ROM CMOS setup chip

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The Motherboard

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The Motherboard (continued)

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The CPU

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Storage Devices

Temporary (primary storage, or memory)

Temporarily holds data and instructions while processing them

Faster to access than permanent storage

Permanent (secondary storage)

Data and instructions must be copied into primary storage (RAM) for processing

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Primary and Secondary Storage

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Primary Storage Devices

Memory, or RAM, located on motherboard and other circuit boards

Volatile versus nonvolatile (or ROM) memory

Types of boards that hold memory chips

SIMMs

DIMMs

RIMMs

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Types of RAM Modules

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Secondary Storage Devices

Hard drives

CD-ROM drives

DVD drives

Zip drives

Floppy drives

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EIDE Technology

Used by most hard drives, CD-ROM drives, and DVD drives

Can accommodate up to four EIDE devices on one system

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IDE Connectors on a Motherboard

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IDE Connectors on a Motherboard (continued)

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Hard Drive’s Power Supply

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Floppy Drive Connection

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Floppy Drive Connection (continued)

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CD-ROM Drive Connection

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Motherboard Components Used for Communication Among Devices

The data bus

System of pathways used for communication and the protocol and methods used for transmission

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Data Bus

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System Clock

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Clock Speed

Of motherboard

Measured in megahertz (MHz)

Of CPU

Measured in gigahertz (GHz)

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Expansion Slots

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Types of Expansion Slots

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Interface (Expansion) Cards

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The Electrical System

Power supply

Most important component of computer’s electrical system

Converts/reduces electricity to voltage the computer can handle

Runs a fan directly from electrical output voltage to cool inside of computer case

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The Electrical System (continued)

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The Electrical System (continued)

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Instructions Stored on the Motherboard ROM BIOS (most are flash ROM)

System BIOS

Startup BIOS

CMOS setup

Motherboard BIOS supports ACPI, APM, and Plug and Play technologies

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ROM BIOS Chip

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Motherboard Configuration Settings CMOS chip

Stores setup (configuration) information

Powered by a battery on motherboard when power is off

Setup information can also be set by jumpers and DIP switches

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CMOS Configuration Chip

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Setting Jumpers

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Using DIP Switches