COMPUTER TYPES

MAGNETIC TAPE

Magnetic tape is also a storage device,it is made up of a plastic tape coated with magnetic substances,the tape is about 2400ft.long and 0.5 inch wide,it has got 7 or 9 tracks ,the capacity of data storring is 800 byte inch or 1600 byte per inch.

TYPES OF COMPUTER

There are many types of computers ,early computers were very big in size and slow in processing ,these days,the computer which is using in our life is very fast in procesing and small in size ,manufacturers have separated all the computers with name and types ,computers are classified into four groups ,according to their size,work ,brand and model.-on the basis of size-on the basis of work-on the basis of brand-on the basis of model1-ON THE BASIS OF SIZEEarly computers were very big in size ,they were slow in processing ,as the technology advanced ,new methods were developed and the sizeof computers has been reduced ,thus ,on the basis of size ,the computer are classified as-super computer-mainframe computer-mini computer-micro computerSUPER COMPUTERS:This is most powerful and expensive computers,they are multiiusers and multi control types ,in this computer 300 to 3000 terminals could be joined ,its working mode is MOPS,it can calculate about 400 milion no. every second and result are always exactly correct ,some of the super computers are -CRAY,ETA 10,NEC etc.MAINFRAME COMPUTERS:It is large machine ,which occupies alarge amount of space ,mainframe computers are generally used in big organizations and government departments for large scale data processing ,it consists of different devices like ,CPU,magnetic tapes ,hard disks ,card readers,disk drive units etc.mainfreame computers were early computers ,few of its ex.CYBER-76,IBM 3000,CRAY -I etc.MINI COMPUTERS:Physically ,it is smaller than mainframe computers ,like in mainframe many terminals or work -stations can be joined -up to it ,due to the networking many users could work at a same time,in different termianls ,some of the ex. are -HP 300,VAX 11 etc.MICRO COMPUTERS:The computers consisting microprocessor are micro computers,they are smallest gemera; purpose computers ,they are also called as personal computers ,as they are used by a single person at a time ,it varies from dekstop to laptop size ..for ex. IBM compatible PC ,APPLE ,PENTIUM etc.ON THE BASIS OF WORKThe computers are made to solve a particular job,this types of computers is used to scientific research ,we can clssify as-analog computer-digital computer-hybrid computerANALOG COMPUTERIt deals with measurement of physical values like temperature and pressure ,these are not having the wide aplications like the other microcomputers ex.speed ometer.DIGITAL COMPUTERIt deals with digital no. and performs calculations by counting ,int the form of digital no. 0-1,these computers are very popular and used on every field.ex. microcomptersHYBRID COMPUTERIt is the combinations of digital and analog computers,some of the processing are done according to the analog principle or some processed according to the digital principle ,these computers are used on the jetplanes.ONT HE BASIS OF BRAND-IBM COMPUTER-IBM COMPATIBLE COMPUTER-APPLE OR MACINTOSH COMPUTERAll the computers manufactured by the IBMare known as the computers ,they are also two types IBMPC and tje IBM compatible .all the computer used the c ompatible principle are called the IBM compatible and the general purpose computers are known as the IBM PC.All the computers manufactured by the Apple industry are called the Apple /Macintosh computer ,they are used only for the desktop publishing purpose.ON THE BASIS OF MODEL-extra technology-advacned technology ps/2All the computer which has used the extra technology are called the xt computer and used the advanced technology are called the At computer,these all are available on the form of the micro computer .other computer like the lap top are called the ps-2 computer and widely used for the personal purpose cause they are portable and have the maximum facility as the other microcomputer.