Describe the central processing unit including its role

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Presentation transcript:

Describe the central processing unit including its role Describe internal memory, i.e. ROM and RAM and the differences between them Define input and output devices and describe the difference between them Define secondary/backing storage

The CPU is the ________ of the computer. CPU: Fill in the blanks The CPU is the ________ of the computer. It is where all the searching, sorting, _________ and _________ making takes place. The speed of the CPU is measured in _________ (GHz). A 1 GHz CPU can carry out 1 ________ _________ per second! Intel and AMD are the most popular CPU brands. Billion Decision Gigahertz brain Calculating Instructions

Down Across Portable storage Device passes data into PC Takes place in CPU Devices connected to PC Instructions found in ROM Fastest Memory Permanent Memory 1 4 2 5 3 6 7 Across Used to store extra copies of data. Holds temporary data also know as RAM Devices which passes data out of PC. Can be changed Random Access Memory Carries out calculations An example is hard drive.

Main Memory – Place into correct sequence 1 If the data is not in the cache then the CPU will check the RAM and transfer data to the CPU. 2 The CPU will again check the Cache for the next piece of data. This time the CPU will be able to get the data from the Cache Memory. 3 Temporary data from Applications in use are held in the Main Memory. 4 The CPU will first check the Cache for the required piece of the data so that it can be processed. 5 Applications are installed in the Secondary Storage (Hard drive). The Cache will then transfer the next piece of data from the RAM into Cache. 6

Place correct definitions in the appropriate category. RAM Non-volatile memory which means that memory is not lost when computer is turned off. Volatile which means that when the computer is turned off all data is lost Memory that can not be changed R0M Non-volatile memory which means that memory is not lost when computer is turned off. Is used to store data for a long time (data can be read from and written to). Random Access Memory Backing Storage Users tend to make copies of original files Holds the ‘boot up’ instructions to start the computer Read Only Memory Stores the instructions temporarily whilst data is process by the CPU