ANALOG COMPUTER
Analog computer is one which is designed to work on numerical data represented by physical quantity (i.e. rotation or displacement), electrical charge (voltage and charge), temperature, weight etc which varies continuously. It is single problem oriented machine, offer low cost and ease in programming. Mathematical principles applied for data processing in analog computer are logarithm, summation, exponentiation, calculus, multiplication and division etc.
The main dis-advantage of his computer is it's low accuracy and limited storage capacity. It lacks speed of calculation. Examples TDC mark III, Polyphemus, GEDAA, ANACOM etc. Example of analog device is speedometer of an automobile. they are mostly used in engineering and scientific applications.
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Thermometer represent temperature in terms of a thread of mercury.
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the speed a car can be represented by the rotation of wheels.
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the analog computer is used in hospitals to measure the size of stone in kidney and mental diseases diagnostics (CT Scan) with photographs.
DIGITAL COMPUTER
Digital Computer is a computer which stores data in terms of digits (number) and proceeds in discrete form from one state to another. In digital computers even letters, words and whole texts are represented digitally. the main advantage of digital computer is that any desired level of accuracy can be achieved by considering as many places of decimal as its is necessary. digital computers are mostly used in the preparation of reports, results, tabulation and graphic representations. thus they help in mathematics, engineering, business, accounting etc. so they are versatile in nature. Most of the computer used in Nepal are digital. Examples of digital devices are calculators, digital watches, and digital thermometer etc. Example of digital computer re IBM PC, IBM compatible etc.
Digital computers can be categorized into two categories.
1. General Purpose Digital computer :
It is the one that can work on different types of programs input to it and thus be used in countless application. i.e., these computers are designed to d wide range of information processing task, from scientific to commercial file processing. It can be used to prepare sales report, banking system, payroll etc.
2. Special Purpose Digital Computer :
They are designed to perform a specific task. the program to carry out the task are permanently stored in the computer memory. these types of computer work efficiently but such computers are not versatile.
HYBRID COMPUTER
Hybrid computer is a data processing device which combines the best feature of both analog and digital computer. the digital component normally serve as the controller and provides digital operation while the analog component normally serves as a solver of equations. It helps user to process both continues and discrete data. these machines are generally used in airplanes, scientific applications. Industrial control processes. for example , A computer used in a hospital intensive care unit, and analog device may measure a patients heart functioning or temperature and digital section record and print out in number.
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