Classification of computer-
On the basis of data processed :-
1. Analog - A mechanical, electrical or electronic computer that perform arithmetic operations by using some variable physical quantity such as mechanical movement or voltage to represent number.
2. Digital - The definition of a digital computer is the most commonly used type of computer and is used to process information with quantities using digits, usually using the binary number system.
3. Hybrid - Hybrid computer are that computer which can exhibit features of analog computer and digital computer.
On the basis of size & capacity :-
1. Super Computer - A super computer is a computer with a high level of performance compared to a general purpose computer.
Inventor of super computer -
In USA - Seymour Roger Cray in 1964
Cray 1 - Cray Inc is an American super computer manufacturer headquartered in Seattle Washington.
In India - Vijay Pandurang Bhatkar in 1991
PARAM(Parallel Machine) - PARAM is a series of supercomputer designed and assembled by the Centre for Development of Advanced Computing (C-DAC) in pune, India.
2. Mainframe Computer - Mainframe computer are used basically in research organisations, airline and railway reservation, large industrial bank, etc.
3. Mini Computer - Mini computer are well adapted for payroll preparation, accounting and scientific computations, database management, word processing, Computer Aided Design (CAD), numerical analysis, etc.
4. Micro Computer - A micro computer is the smallest and least expensive of all the computer.
On the basis of purpose :-
1. Special purpose computer - These are designed to perform the special task or to fulfill the specific requirement of the user. So, they are designed to keep in mind the special requirements of the user. These are not used by everyone.
2. General purpose computer - These are designed to fulfill the generalized equipment of the user. This type of computer can be used by everyone.
Device of computer -
1. Input Device
2. Output Device
1. Input device - Input device is responsible for converting our data into suitable binary form then after that send into the memory.
Example :- Pointing device, Scanner, OMR, BCR, MICR, OCR, 3-D.
•Pointing device - It is any human interface
device that allows a user to input data to a
computer this is usally achieved by
deducting moment across a physical
surface. Like - Mouse
•Scanner - Scanner is a input device which
is use for text and image into the computer.
The basic functions of scanner is convert
document into digital format.
•OMR (Optical Mark Recognisation) - It is
special scanner used for recognizing or pre
specified type of mark made by pencil or
pen.
•BCR (Bar Code Reader) - It is special
device used to read bar code data. It is
used fir fast identification of items.
•MICR(Magnetic Ink Character
Recognisation) - It dedects the special
incoded character on bank cheque and
demand draft.
•OCR(Optical Character Reader) - It is
capable of a deducting alfabetic and
numeric character on a computer print out
containing computer pages of hand written
text.
•3-D(3-Dimension) - It is a device that
analysis read words object.
2. Output device - Output device is any peripheral that received data from computer usually for display, projection or physical reproductions.
Example - Monitor, Printer.
•Monitor - Monitor is also known as
VDT(Video Display Terminal) and
VDU(Video Display Unit). It is an output
device that display video images and text.
1st monitor comes in 3rd generation 1973
and its name is Xerox Alto. Length of
monitor is measured in diagonal.
Types of monitor are:-
1.CRT Monitor (Cathode Ray Tube)
2.LCD Monitor (Light Cristal Display)
3.TFT Monitor (Thin Film Transistor)
4.LED Monitor (Light Emitting Diode)
•Printer - Printer is a peripheral which
makes persistence human readable
representation of graphics or text on a
paper. Printer quality is measured in
DPI(Dots Per Inch)
Types of printer are:-
1.Impact printer- This type of printer strike
against the ink ribbon and make
impression the paper and this process is
known as electromagnetic contact.
2.Non impact printer- In this technology
there is no use of electromagnetic contact.
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