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1.3 INFORMATION CODING SCHEME
FILZA NURHANIS MOHD SAZALI BM
Created on February 8, 2022
This is a work by KML to submit to BMKPM under Digitalisation of Teaching & Learning Material Workshop (Session 1/2022).
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Transcript
1.0 COMPUTER SYSTEM
1.3 INFORMATION CODING SCHEME
Start
prepared by Miss Filza Sazali KML
Learning outcomes
At the end of this lesson, you will be able to:
Describe how computers encode characters using Extended ASCII (8 bits), EBCDIC and Unicode
Calculate the total number of bits/bytes in a given word based on each coding scheme
Differentiate coding system based on number of bits and total of number of character used and context use
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Here
INFORMATION CODING SCHEME
RECAP!
DISCUSSION
Learning sessions
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RECAP!
Before we start our lesson, let's recap!
Recap!
Let's Recap!
Go!
Let's Recap!
K is the smallest unit of data a computer can processed. What is K?
BIT
BYTE
Let's Recap!
How many bits are in a 2 bytes?
24
16
Let's Recap!
Which of the following number system consist of only 0s and 1s?
BINARY
DECIMAL
Let's Recap!
F00D16, 5D16, 10B16 Which of the following is the number system used above?
DECIMAL
HEXADECIMAL
Let's Recap!
111012 Convert the following number to decimal.
3110
2910
RECAP!
Example of Biinary: 1102,1012,102
Bytes = a group of 8 bits Bits < Bytes
Hexadecimal is base 16! Comsist of 0 - 9 and A - F
Byte = 8 bits 2 bytes = 8 bits x 2 = 16 bits
Conversion from binary to decimal use place value method!
Results Check your answers!
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INFORMATION CODING SCHEME
RECAP!
DISCUSSION
Learning sessions
Here
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Information coding scheme
- Patterns of 0s and 1s combinations used to represent characters. - Extended ASCII (8 bits), EBCDIC, Unicode - Translates real-world data into a form computer can process easily.
(Discovering Computers 2018)
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Extended ASCII (8 bits)
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1.3 Information Coding Scheme
Extended ASCII
ASCII (8 bits)
American Standard Code for Information Interchange
- Most widely used
- Use 8 bits to represent 1 character
- Can represent 256 different characters
- Used in minicomputers, personal computers
- Takes up less memory
+ info
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Introduction
DISCUSSION
INFORMATION CODING SCHEME
Learning sessions
Here
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EBCDIC
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Information Coding Scheme
EBCDIC
EBCDIC
(EXTENDED BINARY CODED DECIMAL INTERCHANGE CODE)
- Used by mainframe, computers & servers - Uses 8 bits to represent 1 character - Can represent 256 different characters (28 = 256 characters)
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Information Coding System
ASCII & EBCDIC
Disadvantages of ascii & ebcdic
Problem: ASCII & EBCDIC only allow us to represent small numbers of characters (28)
Not large enough for ASIAN languages & others that uses different character set
Only suficient for ENGLISH & eastern European languages
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RECAP!
DISCUSSION
INFORMATION CODING SCHEME
Learning sessions
Here
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UNICODE
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Information Coding Scheme
Uniode
UNICODE
- CAN represent 65, 536 different characters (216 = 65, 536)- CAN represent all world's written languages - Implemented in our computer; Wiindows, Linux, Macintosh OS
Unicode
Uses 16 bits to represent 1 character
Most widely used
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Here
RECAP!
DISCUSSION
INFORMATION CODING SCHEME
Learning sessions
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DISCUSSION
Q: The phrase below used ASCII coding scheme. Identify the number of bits used to represent the phrase.
Emergency Number
A:
a) Calculate the total number of characters
= 16 CHARACTERS
b) Identify the number of bits used in the coding scheme
ASCII = 8 BITS
c) Multiply the characters & bits
Bits used = 16 characters x 8 bits
= 128 bits
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DISCUSSION
Q: The phrase below used Unicode coding scheme. Identify the number of bytes used to represent the phrase.
Data Analyst!
A:
a) Calculate the total number of characters
= 13 CHARACTERS
b) Identify the number of bits used in the coding scheme
Unicode = 16 BITS
c) Multiply the characters & bits
Bits used = 13 characters x 16 bits
= 208 bits
= 208 bits / 8
= 26 bytes
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You've done a great job!!
We will continue learning again!
PLAY GAME to check what you have learn here!
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