The pc system unit looking in the box
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The PC System unit: looking in the box. Unit 4 Special english For the students of computer. topic. the motherboard : Micro processor (main processor) Support electronic circutity Memory chips Expansion board. Computer on the chip : micro processor

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The PC System unit: looking in the box

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The pc system unit looking in the box

The PC System unit:looking in the box

Unit 4

Special english

For the students of

computer


Topic

topic

  • the motherboard :

  • Micro processor (main processor)

  • Support electronic circutity

  • Memory chips

  • Expansion board.

  • Computer on the chip : micro processor

  • The processor : cpu and units.

  • Ram

  • Other high-speed memories

  • A Fleet of Buses


This section about

This section about

  • The processor ,RAM,and a variety of other electronic components are housed in the system unit, usually a metal and plastic upright box(the rower) or inside the laptabs shell. In this section ,well look inside the box at at the major electronic components of a computer system.


The motherboard

the motherboard :

A single circuit board , provides the path through which the processor communicates with memory components and peripheral devises.

The processor as the PCs brain and the motherboard as the PCs central nervous system.

In a PC, the following are attached to the motherboard :

Micro processor (main processor)

Support electronic circuitry (for example on chip handles input/output signals from the peripheral devises)

Memory chips (for example , RAM and other types of memory)

Expansion board. (optional circuit board such as a Fax/modem)

The various chips attached to the motherboard and, therefore , to a common electronic bus that enables data flow between the various system components.


Computer on a chip the microprocessor

Computer on a chip: The microprocessor

  • The microprocessor smaller than a postage stamp and fond in wristwatch and CD player. We used the term chip to refer to any self-contained integrated circuit.in a few year ,virtually everything mechanical or electronic will incorporate microprocessor technology into it is design.

  • The processor : runs the show and is the nucleus of any computer system .sometimes called the central processor unit or CPU , it has only tow fundamental section : control unit and arithmetic and logic unit .these unit work together with random access memory(RAM) and other internal memory.

  • THE control unit :The processor is the nucleus of the computer system ,the control unit is the nucleus of the processor. It has three primary function:

  • To read and interpret program instructions .

  • To direct the operation of internal processor components.

  • To control the flow of program and data in and out of RAM.

  • The processor contains high-speed store area called register that can store no more than a few bytes .because register reside on the processor chip.


Computer on a chip the microprocessor1

Computer on a chip: The microprocessor

  • The Arithmetic and logic unit: it performs all computations (addition , subtraction, multiplication and division)and all logic operation.

  • A logic operation compares tow pieces of data , ether alphabetic and numeric.

  • Ram a read –and- write memory , enables data to both read and written to memory. RAM is solidstate, that is, it is electronic circuitry with no moving part.

  • In contrast to permanent storage on disk, RAM provides the processor only with temporary storage for programs and data.

  • The data in RAM are manipulated by the processor according to program instruction. A program instruction or a piece of datum is stored in a specific RAM location called an address.


Other high speed memories

Other high-speed memories

  • Data and program are being continually moved in and out of Ram at electronic speeds. But that’s no enough. To faster transfer of instructions and data to the processor , computer are designed with cache memory. Cache memory is increase computer system throughput.

  • Another special type of internal memory, called read-only memory (ROM) can not be altered by the user.

  • A variation of ROM is programmable read-only memory such as flash-memory.


A fleet of buses

A fleet of buses

  • The motherboard includes several empty expansion slots that provide direct connections to the common electrical bus. Thes slots let you expand by expandion board , also called expansion cards.

  • Expenions boards are made to fit a particular type of bus

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