Windows operating system was developed as a Graphical User Interface (GUI) for PCs running on MS-DOS. It provides a friendly interface that allows the users to enter commands by pointing and clicking at objects that appear on the screen using a pointing device, e.g., a Mouse or a trackball. These graphical capabilities make a program easier to use. Microsoft Windows takes its name from the on-screen “Window” that it uses to display information.
CLASSIFICATION OF OPERATING SYSTEMS. The OS determines determine the type of processing that a computer system is able to perform, since it controls the allocation & use of the computer resources. Operating systems can be…
• An Operating system is a set of programs that is used to manage the basic hardware resources of a computer. • This is the main program that controls the execution of user applications, and enables the user to access the hardware & software resources of the computer. When the computer is switched on, the OS programs run & check to ensure that all parts of the computer are functioning properly.
SELECTING A COMPUTER SYSTEM. When planning to acquire computer equipments, the individual or organization should carefully weigh the merits and demerits of the methods used to finance the equipment The requirements analysis for selecting a computer system should cover the following: Identify all requirements of the user. Evaluate hardware requirements that will meet the user’s needs. Evaluate software requirements that will meet the user’s needs.
COMPUTER SYSTEMS INTERCONNECTION THE MOTHERBOARD (also called System Board or Circuit board). Computers, like all electronic circuit devices are made of printed Circuit boards (electronic boards on which copper wires have been printed to form…
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This is the process of transforming digital data produced by the computer into human-readable form & recording it in reduced physical size into a photographic film. This method of output provides photographed type of computer output stored as microscopic filmed images into the micro-form.
GRAPH PLOTTERS are output devices that produce graphics, such as diagrams, maps, images, statistical charts etc, on paper. GRAPH PLOTTERS use pens of different types, varying thickness & different colours, in order to plot. The pens are usually under the direct or indirect influence of electronic pulses output by the computer. Plotters are described/ named depending on the type of the base onto which the stationery is placed for the graphical output to be produced onto the paper.
Printers are output devices that facilitates the transfer of information from a computer to a paper. It is used when a permanent record of the output may be needed on paper. Printed output is usually referred to as Hardcopy output, which means that the document can be kept indefinitely for future reference or use. The printed output can be distributed conveniently to reach the recipients of such information/results.
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MEASURING THE MEMORY SIZE OF A COMPUTER. The size of a computer’s memory is the no. of ‘units of storage’ it contains. The unit of storage can be a Bit, a Byte, or a Word. A Bit is the smallest unit of storage & can be used to store a 0 or a 1.
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The CPU is described as the computer’s ‘brain’ that monitors all the computer operations. It is the unit inside the computer where all software instructions, math and logic operations are carried out. In Microcomputers, the CPU is implemented in a single silicon device called a Microprocessor (Computer chip), which is made by combining a very large no. of transistors together using a technology referred to as Very Large Scale Integration (VLSI).
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STARTING-UP (BOOTING) A COMPUTER. Before switching on a computer, make sure that all the components are properly connected, and that the computer is connected to an active power source. Turn on the switch at the…
Supermarkets. Supermarkets and other retail stores use computers for stock control, i.e., to help them manage their daily activities. The stock control system keeps record of what is in store, what has been sold, and what is out of stock. The Management is automatically alerted when a particular item or items are running out of stock and need to be reordered
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ADVANTAGES and DISADVANTAGES OF USING COMPUTERS. Computers have many advantages over other types of office and business equipment that are used for data processing functions. Some of the advantages are:
CLASSIFICATION ACCORDING TO PHYSICAL SIZE. Computers can be classified into 5 main groups according to their size as: Supercomputers. Mainframe computers. Minicomputers. Microcomputers. Portable computers (Laptops, Notebooks & Palmtops).
Type of processor (Central processing unit – CPU) Microcomputers use microprocessors, which are manufactured on a single chip, as their CPU. In larger computers such as supercomputers, mainframe & minicomputers, the processing is carried out by a number of separate, high-speed components instead of a single processor.
The COVID-19 pandemic has forced us to change the way we live and work. One of the most significant changes has been the way we access healthcare. With the threat of infection looming large, many people are now opting to consult with doctors online instead of going to brick-and-mortar clinics.
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Coding is the process of transforming computer instructions into a form a computer can understand. Programs are written in a particular language which provides a structure for the programmer and uses specific instructions to control the sequence of operations that the computer carries out. The programming code is written in and read from a text editor, which in turn is used to produce a software program, application, script, or system.
There are many benefits of programming that make it a great activity for people of all ages. Not only does it teach you how to think analytically and solve problems, but it can also be a great way to express your creativity.
Computer Science versus Computer engineering. There are many different types of engineers, but computer science and computerengineering are two of the most popular. They both involve working withcomputers, but they have different focuses. Computer science…