JSS 1 WEEK THREE LESSON NOTE (ICT_323)

 




Jss1

TOPIC: TYPES OF COMPUTER

Introduction

Computers are capable of performing activities and operations faster and more reliable than human beings. We can categorize computers in two ways; on the basis of data handling capabilities and size, on the basis of data handling capabilities, the computer is of three types:

TYPES OF COMPUTERS

1.     Digital computer

2.     Analogue computer

3.     Hybrid computer

Digital computer

A Digital computer is designed to perform calculations and logical operations at high speed. it accept data (raw) as input, in form of digits or binary numbers (0 and 1) and processes it with programs stored in its memory to produce the output. Examples include all modern computers like laptops, desktops including smartphones.

Analogue computer

Analogue computers are designed to process analogue data. Analogue computers directly accept data from the measuring device without first converting it into numbers and codes. Examples are speedometer, mercury thermometer etc.

Hybrid computer

Hybrid computer has features of both analogue and digital computer. It is fast like an analogue computer and has memory and accuracy like digital computers. It can process both continuous and discrete data. For example, a processor used in petrol pumps that converts the measurements of fuel flow into quantity and price. Similarly, they are used in airplanes, hospital and scientific applications.    

Comments

Post a Comment

Popular posts from this blog

JSS 2 WEEK TWO LESSON NOTE_FIRST TERM 2023

Image
  Jss2 TOPIC: CLASSIFICATION OF COMPUTER BY GENERATION OBJECTIVE At the end of this topic you should be able to:  1. List the criteria for classifying computers.          I.                   2. State the features of computers classified based on technological age. Introduction Computers can be classified into different categories based on different criteria. Basically, computers can be classified based on the following criteria: 1.      Size. 2.      Types 3.      Generation 4.      Purpose or versatility Based on the technological Age of the computer, computers can be classified into: ·         First generation ·         Second generation ·         Th...
Read more

SSS TWO WEEK TWO LESSON NOTE (ICT_223)

Image
  Ss2 TOPIC:   HANDLING COMPUTER FILES Introduction File operation deals with the physical movement of data in and out of files. User programs effectively use file operations through appropriate programming language syntax. The file management system manages the independent files and acts as the software interfaces between the user programs and file operations. Basic Operations of Computer Files 1.     Insertion: records must be inserted at the place dictated by the sequence of the keys. As   obvious, direct insertion into the main data file would   lead to frequent rebuilding of the file. This problem could be mitigated by reserving overflow areas in the file for insertions. But this leads to wastage of space and also the overflow areas may also be filled. 2.     Deletion: deletion is the reverse of insertion. The space occupied by the record should be free for use. 3.     Updating: updating is a combinat...
Read more

JSS ONE WEEK THREE LESSON NOTE (ICT_223)

Image
  Jss1 TOPIC:   MASTERY OF THE KEYBOARD Introduction A computer keyboard is the most commonly used input device. It is defined as the set of typewriter-like keys that enables you to enter data into a computer or other devices. Computer keyboard are similar to electric-typewriters but contain additional typing keys. The standard arrangement of alphabetic keys on the keyboard is known as the QWERTY. The computer keyboard could be wired or wireless. Types of keyboard There are different types of keyboard depending on what they are used for. Some have more keys than the others. Keyboards also come in different shapes but basically a keyboard has regular shape. The types of keyboards are: a)      Enhanced keyboard b)     Standard keyboard   c)      Windows keyboard d)     AT keyboard   Sections of the Keyboard The keyboard is divided into the following sections: ...
Read more