Functions of CPU, Memory and Input /Output Devices
CENTRAL PROCESSING UNIT (FUNCTIONAL PARTS AND FUNCTIONS) The central processing unit comes in action when the input has been recorded through input unit. The central processing unit is responsible for actual processing of inputs to generate the output. The central processing unit (CPU) is considered as the brain of the computer. It is also called as Microprocessor. This device converts all the supplied input into output as per the instructions supplied by the user. The CPU of a computer is the device on which the speed and efficiency of the computer mainly depends on. Fig. 1.3 : Central Processing Unit The CPU is divided into arithmetical & logical unit (ALU) and Control Unit (CU). The ALU performs arithmetical and logical calculations and CU supervises the working of ALU. Computer cabinet is not CPU. CPU is fitted inside it. (a) Control Unit: The control unit acts as sup...
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