Nibble, Byte, word, ASCII, ISCII, and EBCDIC





Nibble, Byte, word, ASCII, ISCII, and EBCDIC are explained below:

(a)    Nibble: The four bits is called Nibble. BCD (Binary-Coded Decimal) number is expressed in a nibble.

Example:

0

0

0

1

 

(b)   Bytes: The two nibbles or eight bits are called Byte.

Example:

1

1

1

0

1

0

0

0

 

(c) Words: A byte represents one character, so, character count of word is equal to byte numbers. For instance, the word “COMPUTER” has 8 characters so, it is represented by 8 bytes.

 

(d) ASCII: It stands for American Standard Code for Information Interchange and pronounced as “ask-ee”. Bob Bomer, computer scientist, is called father of ASCII. He has given concept of ASCII first time, without ASCII, e-mail, WWW, and videos games cannot come in existence in this fast speed.

It has two types:

(i) ASCII-7, and

(ii) ASCII-8.

In ASCII-7, 7-bits code is used to represent character. It has 3-bits zone portion to distinguish character from numbers, but in ASCII-8, it has 8-bits code for characters and its zone portion contains 4-bits.

Example:

Character A    1010    0001

Character B     1010     0010

 

(e) ISCII (1991): It stands for Indian Script Code for Information Interchange for Indian language. It is also an 8-bits code to represent Indian scripts. The Department of Electronics (DOE) has established standard and standard are in action from 1983. These codes are used for 10 Indian scripts- Devanagri, Punjabi, Gujrati, Udia, Bengali, Asami, Telgu, Kannad, Malayalam and Tamil. C-DAC (established in August-September, 1988) developed standard for font coding in 1990 is called ISFOC (Indian Standards for Font Coding).

The computer engineering graduate Mohan Tambe and his friends established GIST (Graphical and Intelligence based Script Technology) at Kanpur in 1983 for establishing computing in Indian language. This institution is merged in C-DAC.

 

(f) EBCDIC:

(i) It stands for Extended Binary Coded Decimal Interchange Code and pronounced as “ebb-seedick”.

(ii) It is a 8-bits code to represent characters. In this system, number has a zone portion of 1111 and character has three types of zone portions:

1100 (A-I)

1101 (J-R)

1110 (S-Z)

Nibble, Byte, word, ASCII, ISCII, and EBCDIC

Nibble, Byte, word, ASCII, ISCII, and EBCDIC




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