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The Components of System Unit

Chapter 4- week 7

Tan Swee Ting

on 7 October 2012

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Transcript of The Components of System Unit

CHAPTER 4- Week 7 The Component of System Unit The system unit is a case that contains electronic components of the computer used to process data The system unit The System Unit The processor, also called the central processing unit (CPU), interprets and carries out the basic instructions that operate a computer

-Contain a control unit and an arithmetic logic unit (ALU) Processor Processor Processor Data Representation A computer circuit represents the 0 or the 1 electronically by the presence or absence of an electrical charge Data Representation The inside of the system unit on a desktop personal computer includes: -Drive bay(s)

-Power supply

-Sound card -Video card
-Memory The motherboard is the main circuit board of the system unit

A computer chip contains integrated circuits For every instruction, a processor repeats a set of four basic operations, which comprise a machine cycle The control unit is the component of the processor that directs and coordinates most of the operations in the computer

The arithmetic logic unit (ALU) performs arithmetic, comparison, and other operations Eight bits grouped together as a unit are called a byte. A byte represents a single character in the computer ASCII (American Standard Code for Information Interchange) is the most widely used coding scheme to represent data Data Representation Each location in memory has an address

Memory size is measured in kilobytes (KB or K), megabytes (MB), gigabytes (GB), or terabytes (TB) Memory Memory consists of electronic components that store instructions waiting to be executed by the processor, data needed by those instructions, and the results of processing the data

Stores three basic categories of items: Memory The system unit contains two types of memory: Memory Memory Three basic types of RAM chips exist: Memory RAM chips usually reside on a memory module and are inserted into memory slots Memory The amount of RAM necessary in a computer often depends on the types of software you plan to use
Memory cache speeds the processes of the computer because it stores frequently used instructions and data Flash memory can be erased electronically and rewritten

-CMOS technology provides high speeds and
consumes little power Memory Access time is the amount of time it takes the processor to read from memory

-Measured in nanoseconds Memory An expansion slot is a socket on the motherboard that can hold an adapter card

An adapter card enhances functions of a component of the system unit and/or provides connections to peripherals

-Sound card
and video card Expansion Slots
Adapter Cards Removable flash memory includes: Ports and Connectors Expansion Slots and Adapter Cards Memory cards, USB flash drives, and PC Cards/ ExpressCard modules On a notebook computer, the ports are on the back, front, and/or sides Ports and Connectors A USB port can connect up to 127 different peripherals together with a single connector

You can attach multiple peripherals using a single USB port with a USB hub Other types of ports include: Ports and Connectors -Firewire port

-Bluetooth port

-SCSI Port -eSATA Port

-IrDA Port

-MIDI Port A port replicator is an external device that provides connections to peripherals through ports built into the device

A docking station is an external device that attaches to a mobile computer or device Ports and Connectors Buses A bus allows the various devices both inside and attached to the system unit to communicate with each other

-Data bus -Address bus

A computer can have these basic types of buses:
-System bus -Backside bus
-Expansion bus A bay is an opening inside the system unit in which you can install additional equipment

A drive bay typically holds disk drives Bays Power Supply The power supply converts the wall outlet AC power into DC power

Some external peripherals have an AC adapter, which is an external power supply Putting It All Together Keeping Your Computer or Mobile Device Clean
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