Case Study

 

   

3. Processing:

   The task of performing operations like arithmetic and logical operations is called processing. The Central Processing Unit (CPU) takes data and instructions from the storage unit and makes all sorts of calculations based on the instructions given and the type of data provided. It is then sent back to the storage unit.


4. Output:

   This is the process of producing results from the data for getting useful information. Similarly the output produced by the computer after processing must also be kept somewhere inside the computer before being given to you in human readable form. Again the output is also stored inside the computer for further processing.


5. Control:

   The manner how instructions are executed and the above operations are performed. Controlling of all operations like input, processing and output are performed by control unit.

It takes care of step by step processing of all operations inside the computer.

 

FUNCTIONAL UNITS

   In order to carry out the operations mentioned in the previous section the computer allocates the task between its various functional units. The computer system is divided into three separate units for its operation. They are


1) arithmetic logical unit
2) control unit.
3) central processing unit.

 

Arithmetic Logical Unit (ALU) 

1.Logical Unit :

   After you enter data through the input device it is stored in the primary storage unit. The actual processing of the data and instruction are performed by Arithmetic Logical Unit. The major operations performed by the ALU are addition, subtraction, multiplication, division, logic and comparison.

 

   Data is transferred to ALU from storage unit when required. After processing the output is returned back to storage unit for further processing or getting stored.

 

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Introduction TO IT by Ms.S.Ramya & ms.M.Naga sankari

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