Useful Fullforms set-3

CPU: Central processing unit
UPS: Uninterrupted power supply
SMPS: Switch mode power supply
HDD: Hard disk drive
SSD: Solid state drive
CMOS: Complimentary metal-oxide semi conductor


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Useful Fullforms Set-. 10

GSM : Global system for mobile comunication LTE : Long term evolution VOLTE : Voice over long term evolution IOS : IPhone operating system * CAPTCHA : Completely automated public turing test to tell computers and humans apart DOS : Disk operating system * It is also known as Challenge response authentication.
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Classification of computers Part-II

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•  Micro Computer :- Micro Computer is a small, relatively inexpensive computer with a microprocessor as its CPU. •  Mini Computer :- Mini computers were designed for control, instrumentation, human interaction, and communication switching as it is distinct from calculation and record keeping. •  Mainframe Computers :- Mainframe Computers is a powerful multi-user computer that can support thousand users simultaneously. •  Super Computer :- Super Computers are best in terms of processing capacity and also the most expensive one.
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Operating System (OS)

OS  :- It is system software which works as an interface between user and hardware. Types of OS  :- (1)   Single user OS :- Allows one user at a time. Like PC.e.g. MS DOS. (2) Multi user OS :- Allow multiple users at a time. Like Network.e.g. Unix,Linux. (3) Multitasking OS :- Work on more than one processor at a time and allow users to switch between running applications.e.g.Linux, Unix. (4) Real Time OS :- Processing done within a time constraint. Like Flight reservations,Military applications.e.g.HP-RT. (5) Embedded OS :- It is self contained in the device & resident in ROM. Like Microwave,washing machines.e.g.Win.CE. (6) Batch processing OS :- No.of jobs are put together & executed as a group.e.g.Unix. (7) Distributed OS :- Data can be stored & processed on multiple locations. Like IBM RS/6000 e.g.Unix. (8) Mobile OS :- Operates on smart phones,tablets & digital mobile phones.Mobile OS classified as : * Android :- Introduced by Google in 2007.Based on ...
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