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  Ss 2 TOPIC: Memory Unit      Introduction Computer memory is the storage space in the computer where the data to be processed and the instructions required for processing are stored. Types of memory There are basically two major types of memory, which includes: ·            Primary memory (main memory) ·            Secondary memory (external storage) PRIMARY MEMORY Also known as the main memory, it is the storage in the computer in which data is stored for quick access by the CPU and are connected via a memory bus. The primary memory is divided into two: Random Access Memory (RAM) The RAM is the volatile memory that temporarily stores data and instruction currently being used by the computer. It is called volatile because the content of it disappears when the computer is turned off or there is loss of power supply. Read Only Memory (ROM) The ROM is the...

  Jss 3 TOPIC: Internet and Computer Virus            Introduction Computer virus is a program that spreads by first infecting files or the software areas of a computer, then replicates or makes copies of it. They can disrupt the efficacy of the computer because irregular screen activities destroy the secondary storage devices. Types of Computer Virus There are three types of virus, they are: 1.      Boot sector virus: it affects by replicating code in the boot sector of a floppy disk or hard disk with its own code. 2.      Executive file virus: this is a non-resident computer virus that stores itself in an execution file and infects other files each time the file runs. 3.      Attach on document virus: this type of virus infects documents directly and it could make the document not to open, empty the document or even delete the document. Examples of Computer Virus 1. ...

  Jss 2 TOPIC: Operating System         Introduction Operating system is a system that manages both hardware and software resources in the computer. Computers require an operating system (OS) to work. The operating system comprises a group of programs that manages the computer system resources. Categories of Operating Systems Operating system is divided into three categories: 1.      Single user tasking operating systems: operating system in this category can be used by one user at a time and it can only handle one job or task at a time. One notable example of this operating system is the Microsoft disk operating system (MSDOS). 2.      Single user multi-tasking operating systems: this type of operating system  can accommodate one user at a time and can perform several operations at the same time. For example, you can be working on an MS Excel document, sending your MS word document to the printer and p...

  Jss 1 TOPIC: Evolution of ICT OBJECTIVES: At the end of this lesson, you should be able to: i.         Define evolution of ICT ii.        State the five distinct stages of information evolution        iii.       List some inventors and their inventions     Introduction Over the ages the need for communicating information by man has become more complex and human society has witnessed five distinct stages of information revolution. EVOLUTION OF ICT Evolution of ICT is process of changing from simple techniques of data and information processing to complex and advanced methods through inventions and innovations  . STAGES OF INFORMATION EVOLUTION ·         Invention of language ·         Invention of printing ·         Invention of media; particularly media and television ·   ...