HISTORICAL DEVELOPMENT OF COMPUTING DEVICES The origin of computers dates back to when our fore fathers used their early calculating devices to count. For example Counting with fingers and toes: calculations were done by our fore fathers with their toes and fingers before the invention of computers. Counting with pebbles: when counting with fingers became […]
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I. Preliminary Study Is the first stage of system development life cycle. This is the brief investigation of the system under consideration and gives a clear picture of what actually the physical system is. In practice, the initial system study involves the preparation of a ‘System Proposal’ which list the problem definition, objectives of
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BASIC PROGRAMS FIND SUQARE ROOT OF NUMBERS 10 REM FIND SUQARE ROOT OF NUMBERS 20 INPUT “ENTER FIRST NUMBER OF RANGE”; A 30 INPUT “ENTER LAST NUMBER OF RANGE”; B 40 FOR I = A TO B 50 PRINT “THE SUARE ROOT OF “; A; “IS “;SQR(A) 60 NEXT A 70 END FIND SQUARE
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An organized list of instructions that, when executed, causes the computer to behave in a predetermined manner is called a program. There are many programming languages –C, C++, Pascal, BASIC, FORTRAN, COBOL, and LISP are just few. These are high level programing languages. We also have low level language called assembly languages and machine language.
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PRINTER There are three types of computer printers: Inkjet: Inkjet printers spray a jet of special ink on the surface to create an ink under control of electric field. Ink jet is used where the volume of print out is not very large. Dot matrix: A Dot matrix printer has a print head that has
The internet is a collection of interconnected computer network around the world that provides a wealth of information on nearly any topic you can imagine. The world Wide Web, often simply called the web, is a subsystem of the internet. DEFINITION OF INTERNET The internet is a worldwide network of computers that share information. Information
OUTPUT DEVICES Computer output device is a device that releases the processed data from the computer to either the user or any of the storage devices. There are many devices that produce data in different forms such as audio, Visual and hard copy. Computer output devices are type of peripheral devices connected to a computer,
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HISTORICAL DEVELOPMENT OF COMPUTING DEVICES 2 (PRE COMPUTER AGE TO 19TH CENTURY) JACQUARD’S LOOM (FEATURES, COMPONENT AND USES) The Jacquard loom is a mechanical loom, invented by Joseph Marie Jacquard in 1801. This loom simplifies the process of manufacturing textiles with complex patterns such as brocade, damask and matelassé. The loom is controlled by punched
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MEANING OF DATA Raw facts or entity which no meaning has been attached to because it has not been processed is referred to as DATA. Data could be facts about people, places, things and their activities. When data passes through some manipulation activities in order to organize them to be meaningful or to achieve a
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An Input Device is any computer hardware equipment used to feed or send data into the main storage of a computer for processing. Many input devices can be classified into two: Ø Modality of input( e.g mechanical motion, audio, visual etc) Ø The input is discrete (keyboard) or continuous (mouse’s position) TYPES OF INPUT DEVICES
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Sections of the Keyboard The Keyboard is divided into five sections; I. Alphanumeric keys( Alphabet and Numbers): consist of alphabet (a-z) and numbers (0-9) II. Function keys F1-f12: they are twelve in number f1-F12 and are located horizontally on the first row of the enhanced keyboards. On standard keyboard they are labeled F1-F10 III. Control
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A computer is a special multi-purpose electronic device (Machine) that is capable of receiving instruction (data), storing and processing it and giving a desire result as output accurately at an incredibly high speed. The computer as a system is made up of the following: 1. Hardware 2. Software HARDWARE Refers to the physical units
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LOGIC EQUATIONS Aside representing the functioning of a logic gate with truth table and grammatical definition, the use of logic equations can be used not only to represent logic gates and circuits, but also with the usage of some theorems and equivalences, to reduce the number of terms involved, simplifying the equation. In logic equation
Step 1: Program Specification Program development can be divided into several stages which are shown in the diagram below Step 2: Program Design Step 6: Program Maintenance Step 4: Program Test Step 3: Program Code Step 5: Program Documentation 1. Problem Definition This stage is the formal definition of task. It
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Computer Hardware This is the collection of physical elements that constitutes a computer system. Computer hardware refers to the physical parts or components of a computer such the monitor, mouse, keyboard, computer data storage, hard drive disk (HDD), system unit (graphic cards, sound cards, memory, motherboard and chips), etc. all of which are physical objects
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HISTORICAL DEVELOPMENT OF COMPUTING DEVICES( 20th Century) These generations of computers witnessed the first set of computers that used vacuum tubes for circuitry and magnetic drum for memory and were very big taking up the whole room. They were very expensive to use and in addition made use of lot of heat. The heat generated
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The main objective of the CPU is to perform mathematical calculations on binary numbers; still there are other goals of using CPU as well. The CPU comprises many hardware components like motherboard and circuits. A central processing unit (CPU) is the hardware within a computer that carries out the instructions of a computer program by performing the basic arithmetical, logical, control, and input/output operations of the system.
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To make a computer do anything you have to write a computer program. To write a computer program you have to tell the computer, step by step exactly what you want it to do. An Algorithm can be defined as the set of rules and sequential steps that define how a particular problem can be
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LOGIC GATES A logic gate is an elementary building block of a digital circuit. Most Logic gates have two inputs and one output. At any given moment, every terminal is in one of the two binary condition low (0) or high (1). The logic gate of a terminal can, and generally change often, as the
The System Development life Cycle (SDLC) is a conceptual model used in project management that describes the stages involved in an information system development project from an initial feasibility study through maintenance of the completed application. Various SDLC methodologies have been developed to guide the process involved including the waterfall model (the original SDLC method),
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