Lect-2-Types of Computers computer science engineering
- 2. Types of Computers • Computers are classified according to: – Purpose – Whether the computer is general purpose or special purpose. – Type of Data Handled – is using analog, digital data or a combination of both. – Capacity – the volume of work that the computer can handle is large or small.
- 3. Classification according to purpose • General Purpose Designed to handle variety of different problems and to meet different needs. Normally weak in speed & efficiency as compared to Special purpose computer. Use for applications such as payroll, accounts, inventory control, budgeting and sales analysis. • Special purpose Designed to handle specific problem or to perform special task. Use for specific task like Satellite tracking, industrial process, house hold devices.
- 4. Classification according to data handled Analog computer • Analog computer were commonly used for scientific & engineering problems, particularly in chemical industry, electric power plants, and petroleum refineries. • These type of computers are rarely use in current world. • Example is an electric current meter, Fuel pump station meters, vehicle speed meter, etc.
- 5. Classification according to data handled Digital Computers • Digital computer are specialized in counting, the digital computer handles values that are in a discrete (binary 1 or 0). • Digital computer counts and answer the questions by the method of “HOW Many”. The input data is represented by a number. These are used for the logical and arithmetic operations. • All commonly used computers are DIGITAL
- 6. Classification according to data handled Hybrid Computer • The combination and features of analog and digital computer is called Hybrid computer. Having both digital & analog features. • Used in various areas of engineering, space vehicle simulation and training of astronauts, passenger flight radar system, also used to control robots.
- 7. Classification according to capacity Types of computer computer Digital computer Micro Computer Desktop Workstation Laptops Handheld Main frame Computer Super Computer Mini Computer Analog computer Hybrid Computer
- 8. Micro Computer • Micro computer are the smallest computer system. Their sizes range from calculator to desktop. Its CPU is a microprocessor. It is also known as Grand child Computer. • There are two sub categories in it. One is PC & other is Workstation which is expensive in price comparing with PC due to more features. • Application : - personal computer, Multi user system, offices.
- 9. Portable computers (Mobile computers) Micro Computer • Features: • These computers can transported anywhere. • Lightweights less power uses • Subcategory:- Laptop, Palmtops, e.t.c.
- 10. Mini Computer • These are also small general purpose system. They are generally more powerful and most useful as compared to micro computer. Mini computer are also known as mid range computer or Child computer. • Now the term is not in use, once it was between mainframe & personal computer category, this category was defeated by PC or desktop computers because of reduce price and better performance in speed. • Mini Computers are now replaced with Servers. • Application :- web server, Network Servers, Database server etc.
- 11. Servers • Similar to desktop computers but more powerful and reliable. • Using Multiple Processors 2-8 etc., Memory in GB’s, storage in TB’s • USE IN: – Medium Size or Small organizations, Accounts Servers, email servers, Web servers e.t.c.
- 12. Main Frame Computer Mainframe computers are those computers that offer faster processing and greater storage area. It is also known as Father computer. • Designed for Multiple user interfaces. Different people can operate these computers at the same time for complex intensive tasks. • For Non Stop reliable operation, • To upgrade these systems you don’t have to switch off.
- 13. Main Frame Computer • Using Multiple Processors 2-24 etc., • Memory in GB’s, storage in TB’s • Applications – Host computer, Central data base server. – Use in Large Business, Airlines, Banks, E- Commerce Sites, Military, Industrial organizations.
- 14. Super Computer • Super computer are designed for scientific job like whether forecasting ,artificial intelligence, defense systems etc. They are fastest and expensive. A super computer contains a number of CPU which operate in parallel to make it faster. It also known as grand father computer. • Application – whether forecasting, weapons research and development, nuclear power plants etc.