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CLASSIFICATION OF COMPUTER BY GENERATION

TITLE: NOTE OF LESSON ON COMPUTER STUDIES/ INFORMATION TECHNOLOGY

SUBJECT: COMPUTER STUDIES

THEME: BASIC COMPUTER OPERATION AND CONCEPT

TERM: FIRST TERM

WEEK: WEEK 4

DATE:

CLASS: PRIMARY 5

AGE OF STUDENTS:

CLASS COMPOSITION: Slow and fast learners.

PERIOD:

DURATION: 45 MINUTES

TOPIC: CLASSIFICATION OF COMPUTER BY GENERATION

Sub –Topics:

ENABLE OBJECTIVES

At the end of this Module, Pupils should be able to:

  • List computer generations.
  • Mention the generation of computers.

TEACHING AND LEARNING MATERIALS

  • Analog computer: thermometer, scale machine, blood pressure measuring machine, car speedometer.
  • Digital computers: calculator, digital wrist watch
  • Hybrid Computers: fuel pumping machine pictures, pictures/charts of mainframe, mini, micro, first, second, third, fourth and fifth generation computers.
  • projector
  • Explanatory posters/pictures
  • Explanatory Video

TEACHING AND LEARNING METHOD

  • Explanation
  • Discussion
  • Questions and Answers

REFERENCE MATERIALS

  • Universal Basic Education Curriculum.
  • NERDC Basic Education Curriculum for primary schools.
  • Lagos State Scheme of work
  • Unified Schemes of Work Primary Schools for Computer Studies (MIDDLE BASIC)
  • Internet Materials.
  • Edudelight Computer Studies for Primary Schools.

ENTRY BEHAVIOUR/ PREVIOUS LESSON: The students are familiar with classification of computer based on size.

 WORD FILE: memory,Punched cards, magnetic drums.                 

                                        CONTENT

CLASSIFICATION OF COMPUTERS BASED ON GENERATIONS

Each generation of computer is based on a new technological development.

The following are the generations of computers

  1. First generation computer.
  2. Second generation computer.
  3. Third generation computer.
  4. Third generation computer.
  5. Fourth generation computer.
  6. Fifth generation computer.

FIRST GENERATION COMPUTER

First generation started and ended from 1940 to 1956.the computers are very expensive to operate and used a lot of electricity and they generate a lot of heat. The circuit are made of vacuum tubes and magnetic drums were used for memory purposes. While Punched cards and paper tapes were used to give input and the output is displayed as printouts.

The computer requires large room for operation because it is too big. The instruction are written in machine language which are 0S and 1s for coding instructions. The computer require maintenance always

SECOND GENERATION COMPUTERS

Second generation computer started and ended from 1956 to 1963.

It make use of transistors as it circuit and magnetic core technology as it primary memory and magnetic disk as secondary memory storage. It made the computer smaller, faster, cheaper energy efficient and more reliable than the first generation computer.

Punched cards and paper tapes were also used to give input and the output is displayed as printouts. They used the concept of stored program, where instructions were stored in the memory of the computer. This computer also generate lots of heat but much less compared with the first generation computers. They required less maintenance than the first generation computers.

THIRD GENERATION COMPUTERS

The period of third generation computers started and ended from 1964 to 1971. This generation of computers make used of integrated circuit (ic) chips which helps to increase the speed and efficiency of the computer to a greater degree. The punch card is replaced with keyboard for giving input and print out were through monitors. The computer is smaller than second generation computer. The se computer were much cheaper than first, second generation and it was sold commercially.

FOURTH GENERATION COMPUTERS

It started from 1971 to present. They are modern day computer and they make use of microprocessor, it also make use of reduce size of integrated circuit and it external size and price. This increase power, efficiency and reliability. Semi –conductor memory replace d magnetic

core memory used earlier, resulting in fast random access to memory. The fourth generation gave rise to personal computer (pc). The personal computer for home and office use were introduce in the year 1981 by IBM. Many computers were linked to form networks, which led to the emergence of the internet.

FIFTH GENERATION COMPUTERS

The fifth generation computers are present and next generation computers.

The main aim is to develop computers that are capable of learning and self-organization (artificial intelligence).

These computer make use of super large scale integrated (SLSI) Chips, it store millions of components on a single chip, are used in these computers. This types of computers are used in the field of robotics and games. It have large memory and it used parallel processing, which allows several instruction to be executed simultaneously instead of serial execution or executing one after the other. Parallel processing results in faster processing of tasks.

CLASSIFICATION OF COMPUTER BASED ON THE PURPOSE THEY ARE DESIGNED FOR

Computer are classified into

  1. General purpose computer:  these computers are design to perform a range of tasks. They have the ability to store numerous programs but they lack speed and efficiency.
  2. Specific purpose: they are design to handle a specific problem or to perform a specific task. A set of instructions is built into the machine to perform the specific task.

.

PRESENTATION

  • The Teacher revises the previous lesson (CLASSIFICATION OF COMPUTER BASED ON SIZE).
  • The Teacher introduces the topic: CLASSIFICATION OF COMPUTER BY GENERATION.
  • She/he explains different computer by generation.
  • Teacher leads pupils to mention the differences of first, second, third, fourth and fifth generation.

STUDENT ACTIVITIES: student were ask to mention the differences of first, second, third, fourth and fifth generation.

EVALUATIVE ACTIVITIES

  • Mention the differences of first, second, third, fourth and fifth generation.

CONCLUSION: the teacher sum up the lesson.

PREVIOUS LESSON: CLASSIFICATION OF COMPUTER BASED ON SIZE

NEXT LESSON: CLASSIFICATION OF COMPUTER BY PURPOSE

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