Benchmarking

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 Benchmarking:

                          Benchmarking is  a technique used to test the overall speed of a microprocessor. The result of these tests are known as benchmarks. The result of benchmarking are usually available on the web and published on computer magazine articles. Benchmarking can provide comparison information for selecting and configuring computer system.

       Windows 7 and 8 offer a set of benchmarks called Windows Experience Index. It checks a computer s overall performance, and the performance of components such as its processor, memory, graphics and storage system.


Data Representation:

                                    Computer is an electronic device that works with digital signals ON and OFF. The digit 0 represents OFF and 1 represent ON. computer work in binary system. This system consists of two digits 0 and 1 called bits A collection of eight bits is called byte. one byte can represents 256 different characters.

Different combinations of 0 and 1 are used to represent different characters. Different coding schemes are used to represent different characters. 

The popular coding schemes are as follow;


BCD Code:

                     BCD stands for binary Coded decimal. It is a 4--bit code. It means that each decimal digit is represented by 4 binary digital. It was used by early computers.


EBCDIC Code:

                            EBCDIC stands for Extended binary coded decimal interchange code. it is an 8-bit code. it is divided in two groups of 4 bits. each group can represent one hexadecimal digit. EBCDID developed by IBM. it is normally used in mainframe computers. it can represent 256 characters.


ASCII:

           ASCII stands for American Standard Code for Information Interchange. it was published in 1968 by ANSI (American National Standard Institute). it is the most widely used coding scheme for personal computers. The 7-bit code can represent 128 characters. it is not enough to represent some graphical characters displayed on computer screens. An 8-bit code can represent 256 characters. The extended 128 unique codes represent graphic symbols.


Unicode:

            Unicode is a 16-bit code. it can represent 65536 characters. it has started to replace ASCII code. it can represent the characters of all Languages in the the world.



        Memory

    Coming soon..

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