The document discusses different coding schemes used in data processing, including ASCII, EBCDIC, and Unicode. ASCII uses 8 bits to represent characters and can represent 256 characters, while EBCDIC is traditionally used on mainframe computers. Unicode uses 16 or 32 bits and can represent over 65,000 characters to support different languages.

1. At the end of this topic, students
should be able to:
Identify the coding system used in data
processing
Differentiate the coding system
a)
b)
1
Computer System
2.3 Information Coding Schemes
Chapter
PDT - 2017/2018

2. Information Coding Schemes
The combination of 0s and 1s that represent characters are defined
by pattern called a Coding scheme.
Popular Coding Scheme
● ASCII (American Standard Code for Information
Interchange)
● EBCDIC (Extended Binary Coded Decimal
Interchange Code)
● Unicode (Uniform code capable of representing all
world’s Language)
2

3. Information Coding Schemes
2
ASCII EBCDIC Unicode
American Standard Code for
Information Interchange
Extended Binary Coded Decimal
Interchange Code
Universal character encoding
standard
Widely used to represent text
based on data for computer
processing on many types of
computers.
Traditionally used with
PCs.
Widely used to represent text
based on IBM mainframe
computers
Primarily is used on mainframe
computers and high-end servers
Widely used to represent text
based data using any written
language, including those in
different alphabets such as
Chinese, Greek and Russian
Use 8 bits to represent a
character
Can represent 256 characters
Use 8 bits to represent a
character
Can represent 256 characters
Use 16 / 32 bits to represent a
character
Can represent more than 65000
characters
Can work in many computer
system
Can work in many computer
system
Can work in several computer
systems, such as
Windows, Mac OS, Linux