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Information Coding Schemes (Extended Binary Coded Decimal Interchange Code…
Information Coding Schemes
Definition
combinations of 0s and 1s that represent upper & lower case letters,numbers and special symbols
American Standard Code for Information Interchange
ASCII-7
A 7-bit standard ASCII code. First 3 bits are zone bits and the next 4 bits for the digits
ASCII -8
An extended version of ASCII-7. Have 4 bits for zone and 4 bits for the digit
Extended Binary Coded Decimal Interchange Code
uses 8 bits(4 for zone,4 for digits) to represent a character/symbol
2^8 = 256 combinations of bits
used mainly in mainframes computers
Unicode
a 16-bit coding scheme that has a capacity of representing all languages
can uniquely represent any character or symbol present in any language
Universal character encoding standard for reprentation of text which includes letters,numbers and symbols in multi-lingual enviroments
how to count bits
e.g: COMPUTER SCIENCE
ASCII : 16x8 = 128 bits
EBCDIC : 16x8 =128 bits
Unicode : 16x 16 =256 bits
