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Function of ALU (Arithmetic Logic Unit in Computer) Points : function of alu (arithmetic logic unit in computer) The ALU (Arithmetic Logic Unit): When the control unit encounters and instruction that involves arithmetic or logic operations, it passes control to the second component of CPU, the arithmetic/Logic unit (ALU). Arithmetic operations are as you might except, the fundamental math operations like addition, subtraction, multiplication and division. Logical operations consist of comparisons i.e. two pieces of data are compared to see whether one is equal to (=), less than (<), or greater than (>) the other. They are also used combinations, such as “greater than or equal to”. The ALU also uses specialized storage areas called register in which data is held while operations are performed on it.

Difference between Computer and Calculator Points : difference between computer and calculator Difference between Computer and Calculator Computer Calculator 1. Computer can accept and operate alphabetic data. Calculator can not accept alphabetic data. 2. Computer has large memory for storing programs hind data. Calculator has small memory. 3. Computer has internal storage. It has very small internal storage as compared to computer. 4. It has predefined instruction called, Program. It has no predefined instructions like a program. 5. It performs numeric, arithmetic and logical operations. It performs only numeric and arithmetic calculation.

Parts of CPU Points : Parts of CPU, Control Unit (CU), Arithmetic and Logic Unit (ALU), Registers, Memory Unit (MU) Parts of CPU: i. Control Unit (CU) ii. Arithmetic and Logic Unit (ALU) iii. Registers iv. Memory Unit (MU) Control Unit (CU): Control unit directs and co-ordinates all activity of computer It controls, Time and sequence of operation of computer. input/Output devices. The execution of program. Storage and retrieval of data from memory. Storage and retrieval of’ data from storage devices, Routing of information between memory and (ALU). The direction of arithmetical and logical operation. Arithmetic and Logic Unit (ALU): Arithmetic and logic unit can perform numerical processing of data including addition, subtraction, multiplication and division, It can perform certain logical operation i.e. <, >, <>,to make simple decision. Registers: Registers are special storage areas built into microprocessor to. Access data at high speed. Operate on data and to per