CPU
Central processing Unit
The CPU stand for central processing unit, is the heart and brain of a computer. CPU term is Also known as a central processor, or chip. The central Processing Unit (CPU) is
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the unit which performs most of the processing inside computer
All functions and process that are done on a computer are Performers directly of indirectly by the processor.
The two typical components of a CPU include the following;
The firs one is arithmetic logic unit (ALU) . which performs arithmetic and logical operations. The second one is control unit (CU) .
Which extracts instructions from memory . decodes and executes them, calling on the ALU when necessary.
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Input devise Information
An input device accepts the input from the user.
There are many kinds of input devices like Keyboard, Mouse etc.
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There are mainly 3 functions of input device are as follows.
Input Devices
Any instruction and data can beer providing to computer through input deice and computer process there instructions.
Keyboard
The keyboard looks like a typewriter. Kind of input device.
The dharactrerstic of Key Board are;
It contains all the letters of the alphabet, numbers and some special symbols.
v It is operates like a typewriter keypad , buty instyeasd of moving an arm,
v which strikes the paper, it sends and electronic impulse to the compute,
v
On key press it sends a code (ASCII) (American Standard code for Information Interchange))
Mouse
It is a device that is usede to control the computer. Kind of Input device. The characteristics of mouse are;
v A cable connects the mouse to the computer. When the mouse is moved on a pad the cursor moves on the screen
v It is point & click With two Buttons and wheel. Normally Left Click for Select / Run and righty Click to generated Menu
Ø Scanner
Ø Track Ball
Ø Joystick
Ø Light pen
Ø OCR
Ø Microphone
Ø Bar Code Reader
Output Devices
Output Devices gi8ve ;result eitherintgharedeor soft from . The devices s within are used to display
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the data to the user either in the form of
hard copy or soft clop are called output device
The example of output devices are screen
Monitor
This is o an outputs device. Sather are tow topes of the soft
output device d]
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Outputted deice of egg visuals output devices.
VDU Is a is soft Output device and dosed for the getting fo sty visual output on screen. It measured diagonally
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from one cornea of the screen o the opposite corner
Printer
A printer is ans ouput device that prints text documents images, spread
sheet etx as hard copy Printer’s quality is measured in dot per inch (DPI)
The two typed printer
§ Impact Printer
§ Dot matrix printer
Computer Memory and storage
It is an internet storage area in the computer System.
The term Memory is used for physical memory,
Which refers to other actual chips capable of holding data
There is also a biretta memory
Which expands phuysixl Memory onto a hard disk
There are two types of memory use in c
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