Features of computer are:
features of computer are:
Processor
speed
reliability
accuracy
automation
diligence
consistency
no.feelings
Random access memory (RAM)
Operating system
Graphics adapter and video RAM
Monitor
02,.generations of computer
FEATURES OF FIRST GENERATION
1. Use of vacuum tubes
2. Big & Clumsy
3. High Electricity Consumption
4. Programming in Mechanical Language
5. Larger AC were needed
6. Lot of electricity failure occured
FEATURES OF SECOND GENERATION
1. Transistors were used
2. Core Memory was developed
3. Faster than First Generation computers
4. First Operating System was developed
5. Programming was in Machine Language & Aseembly Language
6. Magnetic tapes & discs were used
7. Computers became smaller in size than the First Generation computers
8. Computers consumed less heat & consumed less electricity
THIRD GENERATION FEATURES
1. Integrated circuits developed
2. Power consumption was low
3. SSI & MSI Technology was used
4. High level languages were used
FOURTH GENERATION COMPUTERS
1. LSI & VLSI Technology used
2. Development of Portable Computers
3. RAID Technology of data storage
4. Used in virtual reality, multimedia, simulation
5. Computers started in use for Data Communication
6. Different types of memories with very high accessing speed & storage capacity
FIFTH GENERATION COMPUTERS
1. Used in parallel processing
2. Used superconductors
3. Used in speech recognition
4. Used in intelligent robots
5. Used in artificial intelligence
03.personal computer
A personal computer (PC) is any general-purpose computer whose size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated directly by an end-user with no intervening computer operator. This contrasted with the batch processing or time-sharing models which allowed larger, more expensive minicomputer and mainframe systems to be used by many people, usually at the same time. Large data processing systems require a full-time staff to operate efficiently.
04.workstations
A type of computer used for engineering applications (CAD/CAM), desktop publishing, software development, and other types of applications that require a moderate amount of computing power and relatively high quality graphicscapabilities.
Workstations generally come with a large, high-resolution graphics screen, at least 64 MB (megabytes) of RAM, built-in network support, and a graphical user interface. Most workstations also have a mass storage device such as adisk drive, but a special type of workstation, called a diskless workstation, comes without a disk drive. The most common operating systems for workstations are UNIX and Windows NT.
In terms of computing power, workstations lie between personal computersand minicomputers, although the line is fuzzy on both ends. High-end personal computers are equivalent to low-end workstations. And high-end workstations are equivalent to minicomputers.
05.mainframe and super computers
A very large and expensive computer capable of supporting hundreds, or even thousands, of users simultaneously. In the hierarchy that starts with a simplemicroprocessor (in watches, for example) at the bottom and moves tosupercomputers at the top, mainframes are just below supercomputers. In some ways, mainframes are more powerful than supercomputers because they support more simultaneous programs. But supercomputers can executea single program faster than a mainframe. The distinction between small mainframes and minicomputers is vague, depending really on how the manufacturer wants to market its machines.
super computers
The fastest type of computer. Supercomputers are very expensive and are employed for specialized applications that require immense amounts of mathematical calculations. For example, weather forecasting requires a supercomputer. Other uses of supercomputers include animated graphics, fluid dynamic calculations, nuclear energy research, and petroleum exploration.
The chief difference between a supercomputer and a mainframe is that a supercomputer channels all its power into executing a few programs as fast as possible, whereas a mainframe uses its power to execute many programs concurrently.
06. applications of computer
 
08.classification of computers according to size,features and latest version of operating system
They can also be classified in different ways like classification of computers by size.
v Super computer
Super computers can process huge amounts of data, The biggest in size, the most expensive in price than any other is classified and known as super computer. It can process trillions of instructions in seconds. This computer is not used as a PC in a home neither by a student in a college. Governments specially use this type of computer for their different calculations and heavy jobs. Different industries also use this huge computer for designing their products. In most of the Hollywoods movies it is used for animation purposes. This kind of computer is also helpful for forecasting weather reports worldwide.
v Mainframes
Another giant in computers after the super computer is Mainframe, which can also process millions of instructions per second and is capable of accessing billions of data. This computer is commonly used in big hospitals, air line reservation companies, and many other huge companies prefer mainframe because of its capability of retrieving data on a huge basis.
This is normally to expensive and out of reach from a salary-based person who wants a computer for his home. This kind of computer can cost thousands of dollars.
v Minicomputer
This computer is next in line but offers less than mainframe in work and performance. These are the computers which are mostly preferred by the small type of business personals, colleges, etc.
v Personal computers
Almost all the computer users are familiar with the personal computers. They normally know what the personal computer is and what are its functions. This is the computer mostly preferred by the home users. These computers are lesser in cost than the computers given above and also, small in size; they are also called PCs in short for Personal computers.
This computer is small in size and you can easily arrange it to fit in your single bedroom with its all accommodation. Today this is thought to be the most popular computer in all.
v Notebook computers
Having a small size and low weight the notebook is easy to carry to anywhere. A student can take it with him/her to his/her school in his/her bag with his/her book. This is easy to carry around and preferred by students and business people to meet their assignments and other necessary tasks.
The approach of this computer is also the same as the Personal computer. It can store the same amount of data and having a memory of the same size as that of a personal computer. One can say that it is the replacement of personal desktop computer.
classification based on features
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
