HARDWARE:

INPUT DEVICES:

Keyboards: The keyboard is the most common used input device, and it is used to enter commands and key in data. The keyboard is divided into four parts;

 

-The function keys over the top

-The letter keys in the main section

-The numeric pad on the right

-and finally the cursor movement and editing keys.

Mouse:  The mouse enables you to move the arrow cursor all over the page it is much easier to use the mouse then using the keyboard, you position the arrow on the item of your choice and press.

Scanner:  A scanner reads words, and pictures and then translates it into the pattern of light and dark into a digital camera and the computer stores it. The best type has to be the flat bed scanner which works in similar ways that to a photocopier. You  put the page flat on the bed and then the sensor that like a photocopier, passes it translate into the computer.

Digital camera: A digital camera is similar to a normal camera but that’s only looks. The digital camera, instead of recording It, the camera converts light intensities into digital form that can be stored on a disk as a data file.

Microphones:  The microphones of a computer are just the same as of normal microphones. They are used with voice recognition or simply for the Internet so you can speak to the person on the other side. It takes spoken words and translates them into digital signals.

Joystick:  The joystick is used for playing games. It is used to move the (car, plane or person).  Buttons on top and the side are used to perform such other moves of the (car, plane or person). They can’t be used in programs like word-processing, spreadsheet or database, but are used in CAD (computer aided design) software.

MAIN PROCESSOR UNIT:

CPU: The central processing unit or (CPU) for short or microprocessor, is the computers main component that interprets and carries out the commands that are given to it. It can fetch, decode and execute any instruction, and transfers data from one computer to another.

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Memory:   Memory is used to store the programs you use and is the working area that processes the current data (e.g: the letter you write or word-processing). It also comprises of ROM(read only memory) and RAM(random access memory).

Storage:  The size of data or (storage) capacity of a computer is measured in bytes. One byte contains 8 bits. Bits stand for binary digits and is the smallest unit of data that can be stored. There are six types of storage;

-    Bit: Smallest unit of data with value of 1 or 0.

  • Byte: ...

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