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CLASSIFICATION OF COMPUTER There are three main way of classifying computer and the categories are by: 1 . Classification of computer according to their Types • Analogue • Digital • Hybrid 2. Classification of computer according to their sizes • Micro Computers • Minicomputers Computers • Mainframe Computers • Super Computers 3.     Classification of computer according to their functionality • General purpose • Special purpose. • Figure 1: Classification of Computers - Classification of computer according to their Types • Analogue Computers: An analogue computer is a form of computer that uses the continuously changeable aspects of physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved. Figure 1: Slide rule  Examples of analogue computers include: slide rules, planimeters, differential analyzers, the wheel integrator, the harmonic synthesizer, a squaring device

MEANING OF HUMAN ISSUES Human issues in ICT involve all human related duties, functions or responsibilities that are associated with the use of computer. Computer professionals are the individuals that have obtained sufficient education and training in the field of computers and earn livelihood from their chosen profession. COMPUTER PROFESSIONALS AND THEIR FUNCTIONS Computer Manager: He heads the ICT department, coordinates and ensures that IT need of organization is met in conformity with the policy. System Analyst: He examines the feasibility or potential computer application, design computer base system and recommend kind of program to be used in the organization. Computer Programmer: He encodes/writes the procedures detailed by the system analyst in the language suitable for a given computer. Writes computer programs Computer Educator: Computer educator trains people on how to use computer hardware and software and enlighten people on new computer policy

  - DEFINITION OF A NETWORK  A computer network is a collection of computers and devices interconnected by communication channels that facilitate communications among users and allow users to share resources. - TYPES OF A NETWORK  The three types of computer networks are - Ethernet - Token ring - Arcnet ARCNET is an acronym for Attached Resources Computer Networks which is a star LAN topology like structure network. Arcnet was developed by John Murphy at Data Point Corporation in 1976. TOKEN RING local area network (LAN) is a ring like structured topology network. ETHERNET is a bus topology LAN network system. Ethernet LANS use coaxial or twisted pair cables to connect computer systems. - NETWORK TOPOLOGY • In computer networking, TOPOLOGY refers to the layout of connected devices. There are two types of network topology, a physical topology and a logical topology. • The physical topology refers to layout of cables and network devices; and lo

WEEK HISTORY OF COMPUTERS The history of computers is often referred to in reference to the different generations of computing devices. A generation refers to a state of improvement in the product development process. This term is also used in the different advancement of new computer technology. With each new generation, the circuitry has gotten smaller and more advanced than the previous generation before it. As a result of miniaturization, speed, power and computer memory has proportionally increased. New discoveries are constantly being developed that affect the way we live, work and play.  Each generation of computers is characterized by major technological development that fundamentally changed the way computers operate, resulting in increasing smaller, cheaper, and more powerful and more efficient and reliable devices. There are five generations of computer namely; 1. First generation 2. Second generation 3. Third generation 4. Fourth generation 5. Fift

- What is a Memory? Memory is storage part in computer. It is store the data, information, programs during processing in computer. It stores data either temporarily or permanent basis. Memory used to important role in saving and retrieving data. - Definition of Computer Memory The computer memory is the storage where data, programs and information are stored. The two main types of memory are: 1. Primary storage / Main memory 2. Secondary storage / Auxiliary memory 1. Primary Memory / Main Memory–    Primary memory is internal memory of the computer.  It is also known as main memory and Temporary memory. Primary Memory holds the data and instruction on which computer is currently working. Primary Memory is nature volatile. It means when power is switched off it lost all data. For this reason, the main memory is also called Immediate Access Storage (IAS). Types of Primary Memory Primary memory is generally of two types. a. Random Access Memory (RAM) b.

- Definition of Data Data is raw, unorganized or unprocessed facts that need to be processed. Data can be something simple or unseemingly random and useless until it is organised. Types of Data  Qualitative Data: Qualitative Data is descriptive information (it describes something) Quantity Data: Quantity Data is numerical information (numbers). Quantitative Data can also be discrete or continuous: Continuous data: can take any value (Within a range). Continuous data is also measured data. Discrete Data: Discrete data can only take certain values (Like whole numbers). Discrete data is counted data. Examples of Data Below are examples of data. 1. Number 2. Name of things, place or animal 3. Words 4. Measurements 5. Observations or 6. Description of things Sources of Data  Data can come from different sources depending on the importance of the data. The process of getting data is called data gathering or collection process. Below are so

DEFINITION OF DATABASE A database is a collection of data organized in a manner that allows access, retrieval and uses of data. In a manual database, it can be recorded on paper and stored in a filing cabinet. While in a computerized database, it is stored in an electronic format on a storage media. A database is a collection of information that is organized so that it can easily be accessed, managed, and updated. In one view, databases can be classified according to types of content: bibliographic, full-text, numeric, and images. A database is an organized collection of data. It is the collection of schemes, tables, queries, reports, views and other objects. The data is typically organized to model aspects of reality in a way that supports processes requiring information, such as modelling the availability of rooms in hotels in a way that supports finding a hotel with vacancies. CONCEPT OF DATABASE The concept of database is simply described as the terminologies of d

The meaning of BASIC In computer programming BASIC is an acronym for Beginners All-purpose Symbolic Instruction Code, it’s a high level programming language. - BASIC Character set BASIC has character set consisting of the following characters: • Alphabets A – Z • Digits 0 – 9 • Special characters +,-,*,/,@,(),.,$,;,#,:,<,>,”,= etc. - BASIC STATEMENT In BASIC programs are written in lines, each lines starts with a line number which is a label of that particular line. Each one of the line is called statement. And line numbers can vary from 1 to 9999 depending on how lengthy the program could be. Below are also BASIC action words that are known as BASIC keywords that are used to perform series of actions and are used to form a BASIC statement. Some examples are as listed below: - CLS - REM - LET - READ - INPUT - DATA - PRINT - END Basic Arithmetic operators - The following are arithmetic operators in BASIC organized in th

DEFINITION OF CENTRAL PROCESSING UNIT (CPU) The central processing unit (CPU) is the portion of a computer system that executes the instruction of a computer program and it is primary element carrying out the functions of the computer. The central processing unit carries out each instruction of the program in sequence, perform the basic arithmetical, logical and input/output operations of the system. The CPU can be found on the motherboard, all the functions of the CPU are stored in a component called the Chip. - Components of the CPU. The CPU consists of two main units namely; 1. Arithmetic Logic Unit (ALU) 2. Control Unit (CU) FUNCTIONS OF THE CENTRAL PROCESSING UNIT COMPONENTS. 1. Arithmetic Logic Unit (ALU): An ALU is a digital circuit that performs arithmetic and logical operations. The ALU is a fundamental building block of the Central Processing Unit (CPU) of a computer. ALU performs the following functions. 1. It performs the mathematical operation

Definition of Digitalization of Data Digitalization is the process of converting information into digital format. This information may represent an object, image, sound, document or signal (usually and analog signal) organized into discrete set of its points or samples. This is binary data that computers and many devices with computing capacity can understand and process. Digitalization can also be defined as the integration of digital technologies into everyday life. Modern digital camera, television, mobile phones and computers are all examples of digital technology. An analogue system uses a continuous signal that varies in amplitude to represent a variable such as voice or data, rather than having limited range of steps like a digital system. A digital system uses binary numeric system in which electronic pulses are represented by either 1 or high pulse or 0 for a low pulse. Digital systems can easily represent symbols such as alphanumeric characters that represent th