... ALU and waits there while the control unit decides what to do with it. ==> Control Unit. All computers follow instructions that are given to it in a program. These instructions are in a particular order in the program, and following them, and carrying them out, will mean that the computer has accomplished whatever task it was meant to do. Something, in the computer, has to manage the instructions and make sure that all the other parts of the processor do what they should be doing. This is the job of the control unit. The control unit has four jobs 1. It has to decide which instruction to carry out next and then go and get it. 2. It has to decipher the instruction, in other words it has to work out what needs to be done to carry the instruction out. 3. It has to tell other parts of the processor what they should do ...

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