ASCII Code- (American Standard Code for Information Interchange)

ASCII Code- (American Standard Code for Information Interchange):

·        It stands for American Standard Code for Information Interchange.

·        It is a Unicode for all the computer hardware manufacturer to manufacture a computer hardware like mouse, keyboard, monitor, printer, scanner, etc.

·        It is a common alpha numeric code which includes latter’s, symbols, digits.

·        When any key press on the keyboard then keyboard is convert the corresponding ASCII Code of pressing key and then transfer to the CPU.

·        The ASCII is of two types I. 7 bit ASCII Code.
                                               II. 8 bit ASCII Code

I.                   7 bit ASCII Code:

·        The representation of 7 bit ASCII Code

·        X₆ X₅ X₄ X₃ X₂ X₁ X₀ where the every ‘X’ is either 1 or 0.

·        In 7 bit ASCII Code 2⁷= 128 character can be coded.

·        It includes latter, digits, symbol, punctuation marks and control character.

·        Latter- A,B,C,D,……Z
a,b,c,d,……z

·        Digits- 0,1,2, 3……9

·        Symbol- +, -, *, /, %, @, #, ?, !

·        Punctuation mark- : ; , ‘ ‘ “ “

·        Control character:

o   NUL= Null

o   DEL= Delete

o   BS= Back Space

o   HT= Horizontal Tab

o   VT= vertical Tab

o   ACK= AC Knowledge

o   STA= Store

o   ESC= Escape

o   Can= Cancel

Value:

A= 65, B= 66, C= 67…………………. Z= 90

a= 97, b= 98, c= 99……………………z= 122

II.                 8 bit ASCII Code:

·        The representation of 8 bit ASCII Code is X₇ X₆ X₅ X₄ X₃ X₂ X₁ X₀ where the every ‘X’ is either 1 or 0.

·        The 8 bit ASCII Code is used for error checking in a 7 bit ASCII Code.

·        In 8 bit ASCII Code left most bit is used for error checking and it is called as Parity bit.

·        X₇ X₆ X₅ X₄ X₃ X₂ X₁ X₀

·        In 8 bit ASCII Code 2⁸= 256 character can be coded.

·        Parity is of two types- i. Even= 0 (Value set)
                                          ii. Odd= 1 (Value set)

UNI Code- (Universal Code)

·        It is stands for Universal Code.

·        It is a 32-bit code.

·        In uni code 2³² character can be coded.

·        It is use for coding regional language.

·        The odia character can be coded un uni-code.

EBCDIC- (Extended Binary Coded for Decimal Interchange):

·        It is stands for Extended Binary Coded for Decimal interchange.

·        It is an 8-bit code.

·        In EBCDIC Code 2⁸= 256 character can be coded.

·        It includes latter, digits, punctuation mark and control characters like ASCII Code.

·        In EBCDIC Code the left most bit is called as Parity bit which is used for error checking.

·        It allows an image variety of printable character and several non-printable control characters.

·        Write the EBCDIC Coding for the word ‘BAG’ how many bytes are required for this representation.

·        Bag= 3 Bytes = 24 Bit

·        +489= 3 Bytes       1 Bytes= 8 Bit

·        -1870= 4 Bytes = 32 Bit