27-06-2013, 04:55 PM
Computer Memory
Computer Memory.pptx (Size: 742.05 KB / Downloads: 29)
INTRODUCTION
As the word implies “memory” means the place where we have to store any thing, this is very essential part of human being just like this memory is also very important for computer system because in computer system we have to store some data or information and for storing these items we need some memory or space.
So that’s why we can say that memory is very important part of computer system.
Memory are classified into two types :-
Primary Memory :-
Primary memory also known as “main memory” or “internal memory” which is located in the mother board of system or as we say which is directly connected to the CPU. It is the place where only little bit of data are stored either by manufacturer or by user.
This is further divided into two parts :-
RAM
ROM
RAM :-
RAM also known as “random access memory” it stores the data which the user currently uses or as we say it stores the data temporary in it. RAM needs power or electricity to work when the computer power is turned off then all the data in it will be erased automatically.
This is a circuit which have its separate space or slot in motherboard. This allows the computer to run the software faster.
ROM :-
Known as “Read Only Memory” as the word refers mainly it can only read the data which in stored in it. This memory is mainly used by our computer when we just turn on our computer. It contains BIOS of system. This is non-volatile in nature.
Mainly there are three types of ROM :-
PROM
EPROM
EEPROM
Secondary Memory :-
The place where we store our personal data in computer system is known as SM. In this we store data so that when the data is needed we can easily retrieve it. This is the fundamental component of comp. system. It is non volatile in nature so that we can not loose the data when power supply is off.
There are two methods for accessing the data from it :-
1. Sequential – This is the method in which we search the data sequentially or line by line until you find the desired data. E.g.. Magnetic tape, etc.
2. Direct – This is the method in which computer can go directly to the information that the user wants.
e.g. magnetic disk, optical disk, etc.