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Chapter 06The System Unit

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Competencies

After you have read this chapter must be able to:

1. Discuss memoryincluding RAM, ROM, and

flash memory.2. Discuss expansion slots and cards

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Memory

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1) RAM: Random Access Memory (RAM) chips hold the

program and data.

Ram is called temporary or volatile because every

thing in most types of ram is lost as soon as the

microcomputer is turned of .

Cache memoryimproves processing by acting as

a temporary high-speed holding area between thememory and CPU.

Other types of RAM

DRAM, SDRAM, DDR, Direct RDRAM. Return

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Memory

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2) ROM:

Read-only memory (ROM) chips are not volatile

and cannot be changed by the user.

CPU can read, or retrieve () data andprograms but the computer cannot write. Contain special instructions for basic computer

operations.

Rom instructions are Needed to start a computer , to

access memory, and handle keyboard input.

Give keyboard keys their special capabilities

Put characters on screen

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Memory

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Memory

3) Flash memory:

offers a combination of the features of RAM and

ROM.

Like ROM , it dose not lose that information when

power to the computer system is turned off.

Flash memory is used for a wide of range of

applications. If changes are made to the computer system, these

changes are reflected in flash memory.

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Expansion Slots and Cards

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Expansion Slots and Cards

Allows for new devices to be added

Slots provide for expansion.

Expansion cards are also called:

Plug-in boards

Controller cards

Adapter cards

Interface cardsTaisirdarwish

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Commonly Used Expansion Cards

The most expansion cards are:

1) Graphics cards:

Provide high quality 3D graphics and animation for

games and simulations.

2)Sound cards:

accept audio input from microphones. And convert it

into a form that can be processed by the computer.

convert internal electronic signals to audio signals.so

they can be heard from external speakers or home

theater system.

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Commonly Used Expansion Cards

The most expansion cards are:3) Network interface cards (NIC):

Also known as(Network adapter card):

Used to connect a computer to a network.

the Network adapter card typically

connects the system unit to a cable that

connects to the network.

The network allows connectedcomputers to share data, programs,

and hardware.

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Commonly Used Expansion Cards

The most expansion cards are:

4) Wireless network cards:

Allow computer to be

connected without cables.

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Commonly Used Expansion Cards

The most expansion cards are:5) TV Tuner Cards And Video Clips

Contain a TV tuner and video converter that changes a

traditional TV signals into one that can be displayed on

your monitor. . Allows you to view your favorite TV shows while running

other applications such as Excel.

Video can be captured to a file, added to a Web page,

attached to an email, or added to a class presentation.

Inexpensive and easy to install.

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Plug and Play

Plug and play has become a generic

term that is associated with the

ability to plug any device into a

computer and have it play or work

immediately. .

Creating devices that are able toconfigure themselves when installed

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Commonly Used Expansion Cards

The most expansion cards are:

6) PC cards & Express card slots:

accept credit card- sized cards in notebook

computers.

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