~ Limitations Of Computers:
1. No. I.Q:
It possesses no intelligence of its own. Its I.Q. is zero atleast till today. It has to told what to do and in what sequence.
2.
The application logic must be understood: The computer can only process jobs which can be expressed in a finite number of steps. Each step must be clearly defined. If the steps in the solution cannot be precisely stated, the job cannot be done.
3.
Dependent on human being.
4.
It requires a lot of looking after.
5. Environment:
The environment for operating the computer should be suitable to it.
6 No Feeling/Judgement:
Computer cannot make judgement which a human being make in day to day life. Its judgement is based on the instructions given to it in the form of programmes that are written by us,
7.
It is very sensitive to dust particles even a small dust particle can make great losses to it.
~ Classifications Of Computers:
Computers can be classified in different ways:
1. Computers Classification according to Data Representation Techniques:
According to data representation techniques, computers can be classified into three types as shown in fig.
(a) Digital Computers
Digital Computers take input in the form of numbers, letters and special characters, store it and process it and give the output in the form of numbers, letters and special characters. Such computers always process data (including text, sound, graphics and video) into a digital value (in 0's and 1's) data flows in the form of pulses.
Digital Computers have the capabilities of adding, subtracting, multiplying dividing and comparing. These computers provide highly accurate result
For example:
(i) Desk Calculators
(ii) Electronic Computers
(b) Analog Computers:
Analog Computers do not operate on digital data. Instead they operate on data presented to them in the form of continuously variable quantities like temperature, pressure, revolutions and the like. The representation of the flow of data is shown in figure
They react in a pre-defined way to changes in the specified quantities. Analog computer is faster than the digit computer but can give a accuracy of not more than 99%. These computer are suitable for use as controlling devices in factories, military weaponary, aerospace systems and the like.
For example:
(i) Speedometer
(ii) Voltmeters
(iii) Pressure Gauges
(iv) Slide Rules
(v) Flight Simulators for training pilots
(vi) Wall Clock.
(C). Hybrid Computers:
Hybrid Computers combine the features (capabilities) of both the digital and analog computers. They are suitable where digital processing is necessary in respect of data collected in the analog form. Both analog & hybrid are special purpose computers.
For example, in a hospital intensive care unit (I.C.U) measures a patient's heart function, temperature & other vital signs. These measurements are in analog form. These measurements may then be converted into number (Digital form) & supplied to a digital device which may send as immediate signal to a nurses station if any abnormal reading are detected.
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