Computer Notes 2



What is Memory:- Memory can refer to any medium of data storage, it is usually refer to RAM.
                            Memory can be two type as follow:-                                           
           


Primary Memory
Secondary Memory 
Primary memory is also known as main/temporary/volatile memory.This kind of memory is available in form of silicon chips , and are assembled in the main board.

Secondary Memory is permanent storage memory .it is non volatile in nature.
Secondary memory is required because RAM is volatile in nature.

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Primary Memory
RAM (Random Access Memory)
ROM (Read Only Memory)
1. SRAM (Static RAM) 
    Eg:- Cache Memory 
2. DRAM (Dynamic RAM). 
RAM can be measured in two parameters Storage Capacity and Transfer Speed

Eg:- RAM in PC. It has 
PROM (Programmable ROM)
EPROM(Erase able PROM)
EEPROM (Electrical EPROM)









ROM chip contains all the necessary information required during the booting operation of the computer. Computer use CMOS chip to access all the information of ROM (BIOS)


Click here to know difference between SRAM and DRAM

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How Cache Memory Works
(Click on Image for large view )


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Secondary Memory

It is permanent storage memory and non volatile in nature. Secondary memory required because of RAM is volatile in nature and limited storage space.RAM is also costlier than secondary memory storage devices.
There are two main operations that are performed in secondary storage devices (Read and Write).

1. Read:-  Read operation read from memory.
                  (For exp. Playing music on Smartphone)

2. Write: - Write operations writes data to memory.
                 (For exp. Downloading music into Smartphone from any another source like Internet)

Read More..............

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Operating System (OS)

An operating system is a system software that manage computer hardware and software resources, provides required services that are demand by computer programs. 

Read more......................

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World Wide Web (WWW)

The World Wide Web is a system of internet servers that supports hypertext to access several internet protocols on a single interface. The WWW  was developed in 1989 by Tim Berners-Lee of the European Particle Physics Lab (CERN) in Switzerland.

Read More..........

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Know more about Basics of Computer..........Click Here



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