Basic operation of Computer

Topic:-

Presented by:-Muhammad Adeel

ConstanceBlock DiagramInputInput devicesProcessingStorageStorage devicesOutput Output devices

4 Basic operations performed by computer system

I. · INPUTTINGII. · STORAGEIII.· PROCESSINGIV. · OUTPUTTING

Block Diagram

Processing

Input Output

Storage

Input

Input unit links the external environment with the computer system. Data and instruction must be entered to the computer before performing any competition. Data or instructions can be entered through input devices

Inputaccepts data or instructions from

external world.· It converts these instructions and data

in computer acceptable form.· It supplies the converted instruction &

data to the computer for further processing.

Input Devices

keyboardA keyboard is the set of typewriter-

like keys that enables you to enter data into a computer. Computer keyboards are similar to electric-typewriter keyboards but contain additional keys. The keys on computer keyboards are often classified as follows:

Types of key in keyboard

Numeric keypadA numeric keypad, numpad or ten key, is

the small, palm-sized, seventeen key section of a computer keyboard, usually on the very far right. The numeric keypad features digits 0 to 9, addition (+), subtraction (-), multiplication (*) and division (/) symbols, a decimal point (.) and numlock and enter keys

MouseA mouse is an input device that you can

move as the pointing flat surface(usually on a desk or keyboard)

A device that controls the movement of the cursor or pointer on a display screen.

ProcessingALU is the place where actual execution of

the instructions takes places during the processing operations. All calculations & comparisons are made in the ALU. The data and instructions stored in the primary storage are transphered as where required. Intermediate results are also transp hered back to the ALU for the final processing. After completion of processing the final results are send to storage units from ALU.

Processing Cycle

Storage Before actual processing start, data &

instructions entered to the computer must be stored inside the computer. Similarly, results produced by the computer are required to be stored before being passed to the output unit. The intermediate result produced by the computer must also be stored for further processing. In short the function of storage unit:

StorageIt stores all the data to be process.It stores intermediate results.It stores final result are realize an output

device.

Storage Devise

Output

• The job of output unit it is just the viewers of that any input unit it provides information reasons of computation to the output of the world. Output unit links the computer with the external world. A computer prepares results in binary code. Output unit converts these results into human acceptable forms. In short perform the following functions.

Output

It accepts the result produced by the computer.

It converts these coded results to human acceptable form.

It supplies the converted to the outside world.

Inkjet printer Vs laser printerInk jet printers "blow" or shoot a tiny spot of

ink as the printer head moves across the paper. Laser printers use a complex process of putting a charge on a heated metal drum that is affected by the laser to produce the characters and graphics that are to be printed.

Thanks for your attention

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