CPU DEFINITION AND FULL INFORMATION FREE

CPU DEFINITION AND  FULL INFORMATION FREE 

CPU is defined a central processing unit.Some time reffed simple central processor.but more commonly called processor.The CPU is brain of a computer.where most calculation  take place.In term  of computing power, the CPU is the most important element of a CPU system ..

Basic two parts of central processing unit;   ALU    and   CU

ALU   Arithmetic Logic Unit
CU     Control Unit
Memory Unit:   ROM      RAM   CACHE  
ALU:Arithmetic Logic Unit (ALU) is perform all arithmetic and logical functions.

CU : The Control unit(CU)  witch extracts instruction from memory and decodes and executes them calling on the ALU when necessary. 

MEMORY UNIT: 1, The amount of data that can be stored in the storage unit.
2,That in witch storage capacity expressed in the terms of byte. 

                                  

ROM:  Rom stands for Read Only Memory.It is the type of internal memory.The data and instruction in ROM are stored by the manufacture at the time of its manufacturing.
Rom store data and instruction permanently.When the power is switch off the instruction stored in ROM are not lost.That is the reason this memory called non volatile memory.

TYPES OF ROM:
ROM is divided in the following types.
1   PROM
2   EPROM
3   EEPROM

1  PROM stands for Programmable Read Only Memory.PROM memory is not an erasable because its memory fixed.Its data fixed when this manufactured. 

2 EPROM stands for erasable programmable read only memory.This form of ROM is blank.
The users or manufacturer can write program or data on it by using special devices.
So program or data written in the chip EPROM can be changed and new data can be added.

3 EEPROM stands for Electrically Erasable programmable read only memory.This kind of ROM is changed written with the help of electrical devices.So data stored in this type of Rom chip can be easily modified.

RAM: RAM stands for Random Access Memory.Its provides space for your computer to read and write data to be accessed by CPU(Central Processing Unit).
If you add more RAM to your computer,you reduce the number of times your CPU must read data from your hard disk.This usually allows to your computer to work considerably faster as RAM is many times faster than a hard disk.

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