Do it now activity Can you work out what the missing symbols are and work out the order they should be in if the table shows smallest to largest KB kilobyte TB terabyte Last lesson we learnt about the units which are used to measure memory in a computer. GB gigabyte MB megabyte

Learning objectives List the different units of data and their respective values Understand how knowing the size of software you want to run can help to make it run more efficiently

New Learning Characters Images Sound Instructions ASCII Text Data Describe how characters are stored in a computer system using ASCII and how this improves efficiency Decode a message given to you in ASCII Learning objectives New Learning Characters Images ASCII Video Sound New learning Last lesson we found out about how we describe the size of data on a computer system. This might be the file size, the capacity of the hard drive or the capacity of the RAM. Today we will begin to look at how different types of data are actually stored. Some of the kinds of data that is stored on a computer include: What exactly do we mean by characters? Characters are anything that you can physically type on your keyboard. This includes lower-case letters such as abcdefg, upper-case letters such as ABCDEFG, numbers such as 12345678 and symbols such as !"£$%^&*. In your book explain what we mean by characters and give examples of each. As we have already learnt, computers don't understand English or any other 'human' language. Instead they work in BINARY literally 1's and 0's, so how can these be used to represent all of the characters that you can type on your keyboard? The answer is ASCII. Instructions ASCII Text Data Numbers Symbols Capacity Characters

Talk Task What is a character? What is ASCII? What is a character set? Describe how characters are stored in a computer system using ASCII and how this improves efficiency Decode a message given to you in ASCII Learning objectives Talk Task What is a character? What is ASCII? What is a character set? How does using ASCII make using a computer easier? ASCII Text Data Numbers Symbols Capacity Characters

Learning Development Text to ASCII to BINARY converter ASCII table Describe how characters are stored in a computer system using ASCII and how this improves efficiency Decode a message given to you in ASCII Learning objectives Learning Development Text to ASCII to BINARY converter ASCII table 0100110101100001011100100110001101101000011000010110111001110100 This means although you have typed a number on your keyboard it is actually stored with a different BINARY number according to the ASCII code ASCII stands for American Standard Code for Information Interchange, this is a standard that is used by most computers. So when I convert my surname to ASCII code my surname becomes 77 97 72 99 104 97 110 74 Although these numbers would actually be stored in the computer as binary and so my surname would be: 0100110101100001011100100110001101101000011000010110111001110100 That is a bit of a mouthful! Just as well the computer can translate what I type on the keyboard - Marchant - convert it into binary using ASCII code, process it in the way I have instructed (in this case writing it on this webpage) and then convert it back to Marchant so I understand what is displayed on the screen! ASCII Text Data Numbers Symbols Capacity Characters

Describe how characters are stored in a computer system using ASCII and how this improves efficiency Decode a message given to you in ASCII Learning objectives Independent Task Using the sheet your teacher has given you find out what your name would look like using ASCII code. Then have a go at the ASCII exercise sheet. Remember although you will be working with denary numbers the computer would actually store these as binary. ASCII Text Data Numbers Symbols Capacity Characters

Independent Task ASCII Text Data Numbers Symbols Capacity Characters Describe how characters are stored in a computer system using ASCII and how this improves efficiency Decode a message given to you in ASCII Learning objectives Independent Task Level 5: Explain how each character is stored on the computer using ASCII code. Level 6: Explain what the computer is actually doing when you type a word on the keyboard and it appears on screen in a word processor. Level 7: Explain how being able to write characters rather than their binary representation helps to make using a computer more efficient. ASCII Text Data Numbers Symbols Capacity Characters

Extension ASCII Text Data Numbers Symbols Capacity Characters Learning Describe how characters are stored in a computer system using ASCII and how this improves efficiency Decode a message given to you in ASCII Learning objectives Extension Completed this? Can you find out what message I have sent to you? 77 105 115 115 32 77 97 114 99 104 97 110 116 32 105 115 32 116 104 101 32 98 101 115 116 32 116 101 97 99 104 101 114 33 ASCII Text Data Numbers Symbols Capacity Characters

Describe how characters are stored in a computer system using ASCII and how this improves efficiency Decode a message given to you in ASCII Learning objectives Plenary Write a coded message using ASCII for the class and see who can work it out fastest. ASCII Text Data Numbers Symbols Capacity Characters

ALL MOST SOME ASCII Text Data Numbers Symbols Capacity Characters Describe how characters are stored in a computer system using ASCII and how this improves efficiency Decode a message given to you in ASCII Learning objectives ALL (Level 5) Understand how data, such as numbers, sound and images are physically stored on a computer system. Explain how each character is stored on the computer using ASCII code. MOST (Level 6) Understand how instructions are run inside a computer Explain what the computer is actually doing when you type a word on the keyboard and it appears on screen in a word processor. SOME (Level 7) Understand how instructions can be written efficiently and be able to describe the efficiency of your programs Explain how being able to write characters rather than their binary representation helps to make using a computer more efficient ASCII Text Data Numbers Symbols Capacity Characters

Due: Thursday 16th January List the different units of data and their respective values Understand how knowing the size of software you want to run can help to make it run more efficiently Learning objectives Homework The History of Computing Research Charles Babbage and Ada Lovelace, find out: Who they were When they lived What they invented and what this did What impact this had on computing Due: Thursday 16th January This term your homework will be around a theme - Data Bit Nibble Byte Kilobyte Megabyte Gigabyte Terabyte