Siksha Sarovar

Siksha Sarovar (sikshasarovar.com) is a free educational web application that helps students in India learn programming and prepare for academic and competitive exams. The platform offers structured coding courses (C, C++, Python, Java, HTML, CSS, PHP, Power BI, AI, Machine Learning, Data Science), complete university curriculum notes for BCA/MCA students with previous year question papers, Class 10 and Class 12 CBSE/HBSE school notes, and dedicated preparation material for SSC, UPSC, Banking, Railway and other government exams. Browsing the site is completely free and requires no account. Users may optionally sign in with Google solely to save their learning progress, quiz scores and personal preferences across devices.

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Siksha Sarovar is a free e-learning platform for coding courses, BCA university notes and competitive exam preparation. Optional Google sign-in saves your learning progress across devices.

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Unit 1: Classifications of Computers

Lesson 4 of 34 in the free Fundamentals of IT & Computers notes on Siksha Sarovar, written by Rohit Jangra.

Unit I — Classifications of Computers

Computers are classified based on various criteria: purpose, data handling, and size/capacity. The most commonly used classification in university syllabi is based on size and processing power.

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Classification by Purpose

TypeDescriptionExample
General PurposeCan perform a wide variety of tasksPersonal computers, laptops
Special PurposeDesigned for a single, specific taskATM machines, weather-forecast computers

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Classification by Data Handling

TypeDescription
AnalogProcesses continuous data (voltage, temperature)
DigitalProcesses discrete data (binary 0s and 1s)
HybridCombination of analog and digital

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Classification by Size and Capacity

1. Microcomputers

  • Smallest and most affordable category.
  • Built around a single microprocessor (e.g., Intel Core i7).
  • Used by individuals at home, school, and office.
  • Types: Desktop, Laptop, Tablet, Smartphone
  • Examples: IBM PC, Apple MacBook, Raspberry Pi

2. Minicomputers

  • Medium-sized; more powerful than microcomputers.
  • Used in departments of large organisations (universities, labs).
  • Supports multiple simultaneous users (multi-user systems).
  • Examples: PDP-11, IBM AS/400, VAX 11/780

3. Mainframe Computers

  • Very large and powerful; handle thousands of simultaneous users.
  • Used by large businesses, banks, airlines, and government agencies.
  • Extremely reliable with high availability (24×7 operations).
  • Examples: IBM z15, Unisys ClearPath

4. Supercomputers

  • The most powerful computers in existence.
  • Used for complex scientific simulations: weather forecasting, nuclear research, genome mapping.
  • Speed measured in FLOPS (Floating Point Operations Per Second) — petaFLOPS range.
  • Examples: PARAM Siddhi (India), Frontier (USA), Fugaku (Japan)

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Comparison Table

FeatureMicroMiniMainframeSupercomputer
SizeVery smallMediumLargeVery large
CostLowModerateHighVery high
SpeedModerateHighVery highExtremely high
Users1FewThousandsSpecialised teams
UsePersonalDept. levelEnterpriseScientific research
Key Takeaway: Computers range from pocket-sized microcomputers to room-sized supercomputers. Each type is designed for a specific scale of operation. For the BCA exam, focus on the four-category size-based classification and their distinguishing features.