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History of Computers

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JSS1 First Term Week2

History of Computers

DIGITAL TECHNOLOGY

JSS 1 – LESSON NOTE

Topic: History of the Computer

Class: JSS 1

Subject: Digital Technology

Duration: 40 Minutes

Teaching Methods: Explanation, demonstration and question-and-answer.

Instructional Materials: Pictures of an abacus, Pascaline, Difference Engine, Analytical Engine, ENIAC and modern computers.

1. LEARNING OBJECTIVES

At the end of the lesson, students should be able to:

  1. Explain the meaning of a computer.
  2. Describe the history of the computer.
  3. Identify important people who contributed to the development of computers.
  4. Mention early calculating devices.
  5. Explain the generations of computers.
  6. State the importance of computers in modern society.

2. MEANING OF A COMPUTER

A computer is an electronic device that accepts data, processes it according to instructions, produces information and stores data for future use.

Computers are used in schools, offices, hospitals, banks, businesses and many other places.

3. HISTORY OF THE COMPUTER

The history of the computer explains how computers developed from simple counting devices into the modern electronic machines we use today.

The development of computers took place over many years. Early people needed ways to count, calculate and keep records. As human activities became more complex, they developed better calculating devices.

The history of the computer can be studied through early calculating devices, mechanical computers, electromechanical computers and electronic computers.

4. EARLY CALCULATING DEVICES

1. The Abacus

The abacus is one of the earliest known calculating devices. It consists of beads arranged on rods or wires. The beads are moved to perform counting and basic arithmetic operations.

It was used by ancient civilizations and is still used for learning and calculation in some places today.

2. Napier's Bones

Napier's Bones was developed by John Napier, a Scottish mathematician, in the early seventeenth century. It consisted of numbered rods used to simplify multiplication and division.

3. The Slide Rule

The slide rule was developed from the mathematical principles of logarithms. It was used to perform calculations such as multiplication, division, roots and other mathematical operations.

It became an important calculating instrument before electronic calculators became common.

5. IMPORTANT PEOPLE IN THE HISTORY OF COMPUTERS

1. Blaise Pascal (1623–1662)

Blaise Pascal was a French mathematician who developed a mechanical calculating machine called the Pascaline in 1642. The machine was designed mainly to perform addition and subtraction.

He is remembered as one of the pioneers of mechanical calculation.

2. Gottfried Wilhelm Leibniz (1646–1716)

Leibniz was a German mathematician and philosopher who improved mechanical calculation. He developed the Stepped Reckoner, a calculating machine designed to perform addition, subtraction, multiplication and division.

3. Charles Babbage (1791–1871)

Charles Babbage was an English mathematician widely regarded as the father of the computer.

He designed the Difference Engine to calculate mathematical tables and later proposed the Analytical Engine, a general-purpose mechanical computing machine.

Although the Analytical Engine was not completed during his lifetime, its design contained ideas similar to important parts of modern computers.

4. Ada Lovelace (1815–1852)

Ada Lovelace was an English mathematician who worked on the ideas behind Charles Babbage's Analytical Engine. She wrote an algorithm intended for the machine and is widely regarded as the first computer programmer.

5. Herman Hollerith (1860–1929)

Herman Hollerith was an American inventor who developed a punched-card tabulating machine. It was used to process data for the 1890 United States census.

His work contributed to the development of data-processing technology and the growth of the company that eventually became part of IBM.

6. Alan Turing (1912–1954)

Alan Turing was a British mathematician and computer scientist whose ideas contributed greatly to the theory of computation. During the Second World War, he also contributed to efforts to break German encrypted messages.

He is remembered as one of the important figures in modern computer science.

6. DEVELOPMENT OF ELECTRONIC COMPUTERS

1. First Electronic Computers

During the 1940s, electronic computers began to develop. These machines were much faster than many earlier mechanical and electromechanical devices.

One important example was ENIAC, completed in 1945 and publicly unveiled in 1946. It was a large electronic general-purpose computer that used thousands of vacuum tubes.

2. Second Stage of Development

The invention and use of transistors helped make computers smaller, faster, more reliable and more energy-efficient than earlier vacuum-tube computers.

3. Development of Integrated Circuits

Integrated circuits made it possible to place many electronic components on small chips. This helped reduce computer size and improve performance.

4. Development of Microprocessors

The microprocessor placed the central processing functions of a computer on a single integrated circuit chip. This development helped make personal computers possible.

5. Modern Computers

Modern computers include desktop computers, laptops, tablets and smartphones. They are smaller, faster and more powerful than most early computers. They are used for communication, education, business, entertainment, scientific research and many other activities.

7. GENERATIONS OF COMPUTERS

The development of computers is commonly divided into five generations according to the major technology used.

First Generation (1940s–1950s): Vacuum Tubes

First-generation computers used vacuum tubes for electronic processing. They were very large, expensive and consumed much electricity. They also produced a lot of heat.

Example: ENIAC.

Second Generation (1950s–1960s): Transistors

Second-generation computers used transistors instead of vacuum tubes. They were smaller, faster and more reliable, and they consumed less electricity.

Example: IBM 1401.

Third Generation (1960s–1970s): Integrated Circuits

Third-generation computers used integrated circuits, which contained multiple electronic components on small chips. They were more compact, reliable and efficient.

Example: IBM System/360.

Fourth Generation (1970s–Present): Microprocessors

Fourth-generation computers use microprocessors. This development led to the widespread production of personal computers, laptops and other compact computing devices.

Examples: Desktop computers and personal computers.

Fifth Generation: Artificial Intelligence and Advanced Computing

The fifth generation is commonly associated with artificial intelligence, advanced processing and efforts to develop computers capable of performing tasks that require aspects of human intelligence.

Examples include AI-enabled computers, intelligent assistants and advanced computing systems.

Note: These generations are a common way of teaching computer history. Their dates overlap, and the fifth generation does not have one universally agreed starting or ending date.

8. IMPORTANCE OF COMPUTERS

Computers are important for the following reasons:

  1. They help people perform calculations quickly.
  2. They are used for teaching and learning.
  3. They help store and retrieve information.
  4. They make communication easier.
  5. They are used to prepare documents and reports.
  6. They help banks manage financial transactions.
  7. They are used in hospitals to support medical services.
  8. They help businesses manage records and sales.
  9. They support scientific research and technological development.
  10. They provide access to digital information and educational resources.

9. CLASS ACTIVITIES

Students should answer the following questions in their exercise books.

  1. What is a computer?
  2. What is the abacus?
  3. Who is known as the father of the computer?
  4. What was the Pascaline designed to do?
  5. Who is widely regarded as the first computer programmer?
  6. Mention four early calculating devices or machines.
  7. What technology was used in first-generation computers?
  8. State the major technology used in second-generation computers.
  9. Mention three examples of modern computers.
  10. State four uses of computers.

10. EVALUATION

  1. Define a computer.
  2. Explain the history of the computer briefly.
  3. Mention three people who contributed to the development of computers and state their contributions.
  4. List the five generations of computers.
  5. State two characteristics of first-generation computers.
  6. Explain how transistors improved computers.

11. ASSIGNMENT

  1. Write short notes on the following: a. Abacus
  2. b. Pascaline
  3. c. Charles Babbage
  4. d. Ada Lovelace
  5. e. ENIAC
  6. Draw and label a desktop computer.
  7. List the five generations of computers and state the major technology associated with each generation.

12. SUMMARY

The computer developed over many years from simple counting devices such as the abacus to mechanical calculating machines and modern electronic computers. Important contributors included Blaise Pascal, Gottfried Leibniz, Charles Babbage, Ada Lovelace, Herman Hollerith and Alan Turing.

The development of vacuum tubes, transistors, integrated circuits and microprocessors led to improvements in computer speed, size, reliability and efficiency. Today, computers are essential tools in education, healthcare, banking, business, communication and scientific research.