Unit 1: Introduction to Computer - IIT Notes for BSc. CSIT & BIM (TU)
This study material is designed for Bachelor-level students in Nepal following the Tribhuvan University (TU) syllabus. It covers the fundamental concepts required for the IIt notes and Bsccsit notes curriculum.
Table of Contents
Introduction
Key Takeaway: A computer is an electronic data processing machine that accepts raw data as input, processes it according to a set of instructions (programs), and produces meaningful information as output.
In IIt chapter 1 notes, the computer is defined by its ability to execute the Input-Process-Output (IPO) cycle efficiently.
Characteristics of Computer
- Speed: Measured in GigaHertz (GHz) or MIPS.
- Accuracy: Results are error-free based on the GIGO (Garbage In, Garbage Out) principle.
- Diligence: Ability to work for hours without fatigue.
- Storage: Capability to store vast amounts of data in primary and secondary devices.
- Versatility: Can perform multiple types of tasks simultaneously.
Generations of Computer
The history of computers is divided into five generations based on the switching circuits used.
| Generation | Major Hardware | Software/Language |
|---|---|---|
| First Generation | Vacuum Tubes | Machine Language |
| Second Generation | Transistors | Assembly Language |
| Third Generation | Integrated Circuits (IC) | High-Level Languages |
| Fourth Generation | Microprocessors (VLSI) | 4GL, C, C++ |
| Fifth Generation | ULSI / Artificial Intelligence | Natural Language Processing |
Classification of Computer
1. Based on Work
- Analog Computer: Operates on continuous physical quantities (e.g., Pressure, Temperature).
- Digital Computer: Operates on discrete values (0 and 1).
- Hybrid Computer: Combination of both Analog and Digital.
2. Based on Size
- Supercomputers (Used for Weather Forecasting)
- Mainframe Computers (Used in Centralized Banking)
- Minicomputers (Used in Servers)
- Microcomputers (PCs, Laptops, Tablets)
Exam-Oriented Section (Old is Gold Focus)
Teacher's Note: In the TU Board Exam, the comparison between Analog and Digital computers is a recurring 5-mark question. Always include examples like 'Speedometer' for Analog and 'PC' for Digital.
Important Short Questions
1. List the characteristics of a computer system.
2. Differentiate between hardware and software.
3. What is a hybrid computer? Give one real-world application.
Important Long Question
1. Discuss the five generations of computers in detail, highlighting the major technological shifts in each era.