Classification of Computers_1

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Session - 4Classification of Computers : 

Session - 4Classification of Computers 8/23/2011 Fundamentals of Computing and Programming 1

Objective : 

Objective To know the classification of computers based on physical size, performance, and application areas. 8/23/2011 Fundamentals of Computing and Programming 2

Classification of computers based on physical size, performance, and application areas : 

Classification of computers based on physical size, performance, and application areas 8/23/2011 Fundamentals of Computing and Programming 3 Computers Micro Mini Mainframe Super Desktop Laptop Hand-held Analog Digital Hybrid

Analog Computer : 

Analog Computer 8/23/2011 Fundamentals of Computing and Programming 4

Analog Computer continued : 

Analog Computer continued Analog device – operates with measurements that are continuous such as voltage, temperature and rotation. -Speedometer in your car -Traditional thermometer -Classic clock An Analog computer uses analog measurements in it’s calculations. Analog measurements are “physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved.” -Very fast -Somewhat inaccurate -Difficult to replicate results, can you spin a wheel at exactly the same rate twice in a row? 8/23/2011 Fundamentals of Computing and Programming 5

Digital computer : 

Digital computer All information used by the machine is in one of two states ON (1) or Off (0). A big difference is an analog computer's output can vary even if the input is identical. A digital computer can be very precise. 8/23/2011 Fundamentals of Computing and Programming 6

Analog and Digital Signals : 

8/23/2011 Fundamentals of Computing and Programming 7 Analog and Digital Signals

Hybrid Computer : 

Hybrid Computer Hybrid computer is a digital computer that accepts analog signals, converts them to digital and processes them in digital form. This integration is obtained by digital to analog and analog to digital converter. A hybrid computer may use or produce analog data or digital data. 8/23/2011 Fundamentals of Computing and Programming 8

Hybrid Computer continued : 

Hybrid Computer continued 8/23/2011 Fundamentals of Computing and Programming 9

Slide 10: 

8/23/2011 Fundamentals of Computing and Programming 10 1.Micro Computer 2.Mini Computer 3.Mainframe Computer 4.Super Computer 1.1.Desktop 1.2.Laptop 1.3.Hand-held Digital Computer

1. Micro Computer : 

1. Micro Computer A micro computer is a small, low cost digital computer, which usually consists of a microprocessor, a storage unit, an input channel, and an output channel. 8/23/2011 Fundamentals of Computing and Programming 11

11.1. Desktop : 

11.1. Desktop 8/23/2011 Fundamentals of Computing and Programming 12

11.1. Desktop continued : 

11.1. Desktop continued A desktop computer is a personal computer (PC) in a form intended for regular use at a single location, as opposed to a mobile laptop or portable computer. Most common type of microprocessor The main reason behind the importance of the PCs is that they are not very expensive for the individuals or the small businesses. The computer case, monitor, keyboard, mouse, and power cord are considered the basic parts of desktop computer Examples: IBM, APPLE, Dell and HP 8/23/2011 Fundamentals of Computing and Programming 13

1.2. Laptop : 

1.2. Laptop 8/23/2011 Fundamentals of Computing and Programming 14

1.2. Laptop continued : 

1.2. Laptop continued A laptop is a personal computer designed for mobile use and small enough to sit on one's lap while in use. A laptop integrates most of the typical components of a desktop computer, including a display, a keyboard, a pointing device (a touchpad, also known as a trackpad, and/or a pointing stick), speakers, and often including a battery, into a single small and light unit. The rechargeable battery (if present) is charged from an AC adapter and typically stores enough energy to run the laptop for two to three hours in its initial state, depending on the configuration and power management of the computer. 8/23/2011 Fundamentals of Computing and Programming 15

1.2. Laptop continued : 

1.2. Laptop continued Since laptop resembles a notebook, it is also known as “notebook”. These computers are expensive as compared to desktop computers. Examples: HCL, HP, IBM, Dell 8/23/2011 Fundamentals of Computing and Programming 16

1.3. Hand held (PDA) : 

1.3. Hand held (PDA) 8/23/2011 Fundamentals of Computing and Programming 17

1.3. Hand held (PDA) continued : 

1.3. Hand held (PDA) continued A personal digital assistant (PDA) is a handheld computer, also known as a palmtop computer. Currently, a typical PDA has a touch screen for entering data, a memory card slot for data storage and at least one of the following for connectivity: IrDA, Bluetooth and/or WiFi. Examples: Apple Newton, Casio Cassiopeia and Franklin eBookMan. 8/23/2011 Fundamentals of Computing and Programming 18

2. Mini Computer : 

2. Mini Computer 8/23/2011 Fundamentals of Computing and Programming 19

2. Mini Computer continued : 

2. Mini Computer continued A minicomputer (colloquially, mini) is a class of multi-user computers that lies in the middle range of the computing spectrum, in between the largest multi-user systems (mainframe computers) and the smallest single-user systems (microcomputers or personal computers). It is about the size of a two drawer filing cabinet. It is often connected to a mainframe in order to perform the auxiliary operations. It is capable of supporting from 4 to 200 simultaneous users. Examples: DEC PDP, IBM, VAX 7500 8/23/2011 Fundamentals of Computing and Programming 20

3. Mainframe Computer : 

3. Mainframe Computer 8/23/2011 Fundamentals of Computing and Programming 21

3. Mainframe Computer continued : 

3. Mainframe Computer continued Largest data processing system employed in controlling very complex industrial processes, crunching extremely large numbers at extremely high speeds, storing massive amounts of data, processing millions of real-time transactions, and serving thousands of simultaneous users. In the hierarchy that starts with a simple microprocessor at the bottom and moves to supercomputers at the top, mainframes are just below supercomputers Examples: IBM’s ES000, VAX 8000, CDC 6600 8/23/2011 Fundamentals of Computing and Programming 22

4. Super Computer : 

4. Super Computer 8/23/2011 Fundamentals of Computing and Programming 23

4. Super Computer continued : 

4. Super Computer continued A supercomputer is a computer that performs at or near the currently highest operational rate for computers. A supercomputer is typically used for scientific and engineering applications that must handle very large databases or do a great amount of computation It contains a number of CPU’s that operate in parallel to make it faster. Its processing speed lies in the range of 400-10,000 MFLOPS(Millions of Floating Point Operation Per Second) 8/23/2011 Fundamentals of Computing and Programming 24

4. Super Computer continued : 

4. Super Computer continued Super computer has been used in number of fields like, -weather forecasting -animated graphics -fluid dynamic calculations -nuclear energy research -petroleum exploration Examples: CRAY – 3, Cyber 205, PARAM 8/23/2011 Fundamentals of Computing and Programming 25

Classification based on Purpose : 

Classification based on Purpose we could even classify the computers based on the purpose for which it is being used a. Special purpose computers b. General Purpose computers 8/23/2011 Fundamentals of Computing and Programming 26

Special purpose computers : 

Special purpose computers These are designed to perform specific functions. Instructions are permanently pre- programmed. Examples: aircraft control system, electronic voting machines etc. 8/23/2011 Fundamentals of Computing and Programming 27

General Purpose computers : 

General Purpose computers These are designed and constructed to cater almost all the needs of the society. These computers are able to perform according to the programs created to meet different needs These are being used in financial accounting, mathematical calculations, designing textile prints, business and to solve scientific problems. Example: Desktop, Laptop, mainframe computers, mini computers, super computers 8/23/2011 Fundamentals of Computing and Programming 28