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CoE 330

The Personal ComputerPart 1

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Outline

Computer System

Cases and Power Supply

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Computer system

The Personal Computer

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Computer System

Hardware

Physical equipment

Software

Operating system and programs

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Cases and power supplies

The Personal Computer

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Introduction

Computer Case

Purpose: Provide protection and support for the internal

components

Power Supply

Purpose: convert AC power to DC power

Size and shape of the computer case is determine by the

motherboard and other internal components

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Questions

What is the advantage of a small case?

What is the advantage of big case?

What happens if your power supply has only enough power

for current components?

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Computer Cases

Provides Framework to support internal components

Enclosure for added protection

Environment for efficient performance (cooling)

Made of plastic, steel, aluminum

Form factor: Size and layout

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Form Factor

Desktop Slim line

Full-sized

Tower

Mini

Full-sized

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Computer Cases a.k.a.

Computer chassis

Cabinet

Tower

Box Housing

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Computer Case

Consider the following factors when choosing a case Size of the motherboard

Number of external and internal drive locations (bays)

Available space

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Computer Case

When choosing a computer case, consider the following: Model Type (desktop or tower)

Size

Available Space

Power Supply

Appearance

Status Display

Vents

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Power Supply

Converts AC power to DC power which is required for allcomponents in the PC

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[Keyed] Connectors

Voltage Wire Color Use AT PowerSupply

Form

ATX PowerSupply

Form

ATXv12Power

Supply

Form

+12V Yellow Disk drive

motors, fans,

cooling

devices,

system bus

slots

YES YES YES

-12V Blue Some types

of serialports circuits

and early

PROM

YES YES YES

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[Keyed] Connectors

Voltage Wire Color Use AT PowerSupply

Form

ATX PowerSupply

Form

ATXv12Power

Supply

Form

+3.3V Orange Most newer

CPUS, some

type s of

system

memory,

AGP video

card

NO YES YES

+5V Red Motherboard, Baby AT

and earlier

CPUs and

mother

board

components

YES YES YES

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[Keyed] Connectors

Voltage Wire Color Use AT PowerSupply

Form

ATX PowerSupply

Form

ATXv12Power

Supply

Form

-5V White ISA bus cards

and early

PROMs

YES YES YES

0V Black Ground:

Used to

complete

circuits with

the othervoltages

YES YES YES

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AT (Advanced Technology) Power Supply

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ATX (AT Extended Power Supply)

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ATX v12 Power Supply

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More Connectors

Molex connector connects to an optical drive or hard drive

Berg connector connects to an floppy drive

20-pin or 24-pin slotted connectors connects to the

motherboard

4-pin to 8-pin auxiliary power connector supplies power to

all areas of the motherboard

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Molex Connector

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Berg Connector

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20+4-pin slotted connector

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8-pin auxiliary connector

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Remember

Be sure to choose a power supply that has morethan enough power for the current components.