Draw the functional block diagram of a digital computer. Write down the functions of arithmetic logic unit.

Subject Introduction to Computer System
NU Year Set: 1.(a) Marks: 3+2=5 Year: 2009

The ALU performs Arithmetic and Logic functions. This includes:

·         Add

·         Add with carry

·         Subtract

·         Subtract with borrow

·         Compare

·         And

·         Or

·         Xor

·         etc.

The ALU is the part of the CPU performing the actual calculations. Other parts of the CPU instruct the ALU on which functions to perform, and yet other parts of the CPU are responsible for supplying the arguments to the ALU (e.g. from memory or internal registers) and storing the result (e.g. in memory or internal registers).

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