Breaking the Code... 67 111 109 112 117 116 101 114 32 83 99 105 101 110 99 101 32 105 115 32 67 111 111 108 Can anyone guess the phrase from this “code”?

What happens when.... The letter C is pressed on the keyboard?

Learning Objectives Success Criteria Title: ASCII Understand how characters are represented in binary and be familiar with ASCII and its limitations. Success Criteria ALL— can state what ASCII is and why it’s used. MOST— convert some codes from ASCII into English and answer some questions. SOME— consider ASCII’s limitations and explore what has been done to overcome them.

What is ASCII? Code number 67 Binary 01000011 C C button is pressed Different sets of codes are available for different types of computer. PCs use a character set called ASCII, American Standard Code for Information Interchange. A Character Set is the group of symbols that a computer can represent and includes letters, digits, punctuation marks and control characters. Control characters are things like Esc and Enter (aka CR because it used to be called Carriage Return).

ASCII Explained.... https://www.youtube.com/watch?v=UPlR4eMMCmI

ASCII Table You can Google to find out the codes for ASCII: 7 http://en.wikipedia.org/wiki/ASCII 7

Computer Science is Cool Breaking the Code... 67 111 109 112 117 116 101 114 32 83 99 105 101 110 99 101 32 105 115 32 67 111 111 108 Can anyone guess the phrase from this “code”? http://en.wikipedia.org/wiki/ASCII Computer Science is Cool 8

Task – Convert the following... 65 83 67 73 73 32 105 115 32 97 32 99 111 100 101 32 102 111 114 32 114 101 112 114 101 115 101 110 116 105 110 103 32 69 110 103 108 105 115 104 32 99 104 97 114 97 99 116 101 114 115 32 97 115 32 110 117 109 98 101 114 115 ASCII is a code for representing English characters as numbers http://en.wikipedia.org/wiki/ASCII 9

Task – Convert the following... 65 83 67 73 73 32 109 97 107 101 115 32 105 116 32 112 111 115 115 105 98 108 101 32 116 111 32 116 114 97 110 115 102 101 114 32 100 97 116 97 32 102 114 111 109 32 111 110 101 32 99 111 109 112 117 116 101 114 32 116 111 32 97 110 111 116 104 101 114 46 ASCII makes it possible to transfer data from one computer to another. http://en.wikipedia.org/wiki/ASCII 10

ASCII Questions Explain how ASCII is used to represent text in a computer system. What is meant by the character set of a computer ? Explain the possible limitations of using the ASCII character set for global communication. Find out what is Unicode?

ASCII Create a coded phrase yourself in ASCII and see if someone else can decode it.