... display an error message on the visual display unit (VDU/monitor), to alert the operator. Arithmetic/Logic Unit: In this unit of the CPU, all mathematical calculations like addition, subtraction, multiplication and division, are done in this unit. Data (subject of the calculations), are momentarily, are transferred to the arithmetic/logic unit (ALU). The operations are performed and the answers to the calculations return to the main storage. The ALU is also used to make 'Logical' comparisons, which will mostly determine the route to be taken throughout the program. Main Storage: The main storage of the computer stores all of the data, which is going to be processed. All of the data is entered from an input device. The data will reside in memory while it is being processed, then it will be joined by the results of the processing, which will be contained until it is to be carried out and transferred to an output device. ROM (read ...

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