Computer Memory and Its Types

Here I will disscuss about the two types of memory. One is RAM and Second is ROM.

RAM:

RAM stand for Random access memory. The RAM is also called the main memory of the computer. It is called the random access memory because you can access data from the computers directly(Randomly). It is also called the primary memory.

RAM is the volatile memory. The volatile means that the data that you stored in the main memory can be lost when the power (electricity)  is turned off. Therefore, the RAM called can store data and instruction temporarily.

RAM is read and write memory because CPU can read and write instruction form RAM.

How the RAM is Measured:

The capacity of the RAM is measured is bytes. There are different amount of RAM’s that is comes in market. These are from 128 MB to 4GB and more. RAM improve the speed of the computer to process the data.

RAM

Types of  RAM:

RAM’s are invented in the using of two different technologies. Therefore, the RAM is divided into two types are as follow:

(i)                  DRAM

(ii)                SRAM

DRAM:

                DRAM stands for Dynamic Random Access Memory. This type of RAM is mostly use in coputer system. If you want to maintain data in DRAM, the data must be refreshed with electric charge again and again otherwise you must lost your data. Because it charge with electric charge agnai and agin therefore, it utilize more power. It is slow in working because the COU can not read and write data to and from the DRAM.

SRAM:

               
 SRAM stands for Static Ramdon Access Memory. It does not need to refreshed the data with electric charge agin and again. It is fast then DRAM because CPU does not have to wait to access data from SRAM. Because it does not refreshed with electric charge again and agiain therefore it utilize less power then DRAM. It is use to built very fast memories. It is also know as cache memory.

What is cache Memory……….???

Cache memory is very fast memory. It exist Between RAM and CPU. It has very low storage memory as compared to the RAM.

CPU

Cache Memory

RAM

Cashe memory is used to increase the performance of the computer system. The data that is frequently used is stored in cache memory. When you want to run any program or data in the computer system the CPU first look in the cache memory. If the CPU found it in cache memory then he take that data from it so it increase the working speed of the computer system.

ROM

                ROM stand for Read Only Memory. The ROM is the internal memory of the computer system. The data and instruction are stored by menufacturere at the time of the manufacturing. The data and instruction that is storred in ROM cannot be deleted afterward.

ROM is used to store data and instruction permanently. It mean that the data is not lost when the power is turned off. Therefor it is called non-volatile memory.

ROM is used to store data and instruction permanently, and also used to control the basis

inputand output operations of the computer system.

Types of ROM:

There are three types of ROM are as follow:

1.       PROM

2.       EPROM

3.       EEPROM

PROM:

                     
   PROM stands for Programmable Read Only Memory. This types of ROM is initially blank and user cand write data and instruction on it by using some special devices. If the data is written once in the computer system, it cannot be erased. If any error occur while writing the programmed it cannot be deleted afterward.

EPROM:

EPROM stands for Erasable Programmable Read Only Memory. This types of ROM is initially blank and user cand write data and instruction on it by using some special devices. However, the data is written in it can be erased using some special devices or ultraviolet rays. If any error occur the data can be deleted and new data can be created.

EEPROM

                                
EPROM stands for Electrically Erasable Programmable Read Only Memory. This types of ROM is initially blank and user can write data and instruction on it by using electrical devices. However, the data is written in it can be erased . If any error occur the data can be deleted and new data can be created.