Types of computers complete

             MOLIHSS

Ø  PREPARED BY: Upesh Karki

Ø  SUPERVISED BY: Him Koirala

                                             

1. DIGITAL COMPUTER

                  Digital computer work with digits. These computers work with discrete data. Accuracy of digital computers is high. They have high storage in their memory. Digital computer is multi-purpose and programmable and hence used for general purpose. These computers are totally flexible and can be re-programmed.

2. ANALOG COMPUTER

                    Analog computers work with natural or physical values. These computers work with the continuous data. Accuracy of analog computer is low. They don’t have storage or posses less memory for storage. Analog computers are used for special purpose only. Cost of the analog computer is low.

3. HYBRID COMPUTER

                    A hybrid computer is a combination of both analog and digital computer. They have both system in one device. Hybrid computers are used in weather forecasting.

1. SUPER COMPUTERS

                      They are most powerful and expensive computers. They have extremely large storages capacities and processing unit is at least 10 times faster than other computers. They are big machines. They can be handled by computer engineer only. Some of them are: CRAY, NEC Super SXII, CYBER 205 etc

2. MAINFRAME COMPUTERS

                       They are medium or large size machines, made of several units connected together. They were used in the big organizations and government departments for large scale data processing.

3. MINI COMPUTERS

                        They are like small mainframes. They can be also maintained and operated by general people. They are generally applied to perform smaller work in commercial and government organization.

4. MICRO COMPUTER

                        They are the smallest general purpose computers. They contain a small CPU called micro processor. Micro computers are being manufactured in large scale as compared to other types of computer. they are generally known as personal computers(pcs).

1. INTERNATIONAK BUSINESS MACHINE PERSONAL COMPUTER [IBM PC]

                        IBM is the one of the leading companies of the world in manufacturing computers, which was established in 1924 in USA. The micro computers that are manufactured by IBM are called IBM PC. These computers are more reliable and durable.

2. IBM COMPATIBLES

                        IBM couldn’t produce more computers for all the people. So they sell the architecture and principles of making computer. Thus many computers came in market with different branded names but all are based on IBM principle.

3. APPLE COMPUTERS

                         The computer manufactured by Apple Company with different architecture is called an apple computer. This company was established in 1970s. They had their own hardware and software. Apple Company manufactured new brand of computer probably known as Macintosh.

1. XT COMPUTERS

                         The computers which have 8086 microprocessor or 8086 microprocessor are called XT computers. They have processing speed of 4.77MHZ and they are comparatively slower in speed. They cannot run advance version of software or programs.

2. AT COMPUTERS

                          The computers which have 80286 microprocessors are called AT computers. These computers are faster than XT computers. The memory capacity of AT computers is larger i.e. the RAM is of higher capacity. AT computers come in different capacities and microprocessors like 80286, 80386, 80586(Pentium) and the latest is Pentium-II. All most all the microcomputers used now days are AT computers.  

3. PS/2 COMPUTERS

                           IBM computers started manufacturing next models of computers in 1990. This model is called as PS/2 model computer. Most of the computers manufactured after 1990, including laptop computers belong to this model. It works like AT computers and runs almost all software and programs.