. Out Put device

Monitor: It is primary output device of computer and also known as VDU (Visual Display Unit) because it provides all the result to the user visually It is also known as soft copy output device, Because we can't touch the data displayed on it and we can easily edit the data on it the monitors are different types according to its technology such as;
- Monochrome Monitor: - Provide the result in black and white display.
- Color Monitor: - Provides the result colorful.
- CRT Monitor (Cathode Ray Tube):- This type of monitor uses one vacume tube which is known as cathod Ray tube to display the image and objects.
- LCD (Liquid Crystal Display):- It is more advanced than CRT monitor. It is very thin in size and uses the liquid crystal to form objects.
Printer: - It is known as hand copy output device, when we give print command to the computer, the printer gives the result at printed form on the paper. So we can easily touch the printed data. But we can not edit the printed data. We can categorize the printer into two types. They are;-
i) Impact Printer: - The printer which hits on the paper while printing is known as impact printer. Such as Dot Matrix Printer.
ii) Non Impact Printer: - The printer which sprays the liquid or powder ink at the paper to form on object is known as non- Impact printer it doesn't hit at the paper while printing. Such as Bubble jet printer , laser printer
Plotter: - It is also hand copy output device. Especially this device is used to print the high Quality graphics in large size.
CPU :-
Motherboard: - It is the main PCB (Printed Circuit Board) of Computer. The main work of this board is to flow the data from one location to another it contains different sections and it have its own speed which is known as but speed. (Data transfer speed)
It have the microprocessor socket to connect the microprocessors, RAM slots, PCI slots, ISA slots, AGP slots, H.D.D. controller, F.P.P. Controller, keyboard Controller and other sections.
Processor: - It is used to process the raw data input by using different types of input device. It has its own processing speed. It is connected at processor socket of motherboard
RAM (Random Access Memory) It is temporary memory of computer. It can store the data while the electricity is flowing
H.D.D. (Hard disk drive):- It is permanent storage Media of Computer. It stores all the operating system, programs and all the files and folder of the computer, It have it's own storage capacity
CDROM: - It can read the data of CD's – especially this device is used to read and display the contains of the CDS.
F.D.D. (Floppy disk drive):- the drive which is used to operate 1.44 MB floppy disk. The main work of this device is to read and write the data on the floppy disk.
History of Computer
The Computer was developed from the development of Abacus which was developed 3000 thousand year ago in China. It is one type of counting device which has two sections Heaven and Earth. By moving (Manipulating) the beds of heaven and Earth the counting works will be performed.
After the development of this device in different time period different types of advanced devices were developed. Such as; Napier's bone
Slide rule
Pascaline
The Computer is also developed by using these steps.
In 1946
According to this development of devices into different time period the computer can be categorized into different generation. They are ;
1. First Generation (1946-1958) :- In this time period the computer was developed for the first time. In this time period the memory devices was used in Computers. Which is known as vacume tube?
Features of Generation Computer
- It was very big in Size.
- It uses vacume tube as main memory.
- In this generation of Computer required more electricity (Power) up to 30 KB.
- It was very slow in processing.
- It generates more heat.
2. Second Generation (1958-1964) :- The development of Computer between the time period 1959 to 1964 is known as second Generation. In this generation the technology was developed than first generation.
Features of generation Computer
- It was transistor as main memory
- The size of computer was reduced than first generation
- It has high processing speed than previous generation
- It required less electricity than first generation.
3. Third Generation (1965-1974)
The development of Computer in this times period it known as third generation computer. In this time period the computer was more advanced and reliable.
Features of third generation
- IC was use as main memory and circuit.
- The size was also reduced then previous generation
- The processing speed was increased and memory capacity was also increased.
- It uses less electricity power than previous generation.
- All types of normal software can be easily run in this computer. So it provides friendly environment to the user.
Fourth generation computer (1975- Till)
The computer which we can use now days is known as fourth generation of computer. It has high processing speed and more storage capacity. It also can be categorized in different such categorized such as; Pentium one; Pentium 2 , 3 and 4.
Features of Forth generation
- VLSI and VVLSI were used as main chip.
-Processing speed was developed up to GHZ
- It has more storage capacity than pervious generation
- The storage capacity it up to GB.
- The size of this generation computer is decreased up to laptop computer.
- Ti required low electric power up to twelve volt.
Fifth generation of computer (not started)
The fifth generation of computer has been expected self thinking capacity and understood the human language. The Biochips are used as main components of computer.