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Output Devices for SS1

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Output Devices for SS1 Definition of Output devices Output devices are devices that enable the computer to communicate the results of data processing carried out by it to the user. These devices enable the computer to display text, graphics (pictures and images) and produce sound. Examples of computer output devices include monitor, printer, speaker, plotter, braille embosser etc. Features and uses of output devices 1. Monitor : The monitor, also called Visual Display Unit (VDU) is a TV-like structure attached to the System Unit through the VGA cable. It displays text and graphics (pictures and images). The content showing on the monitor is called a soft copy. 2. Printer : A printer is a device attached to the System Unit through the USB cable or other types of cable. It is used to produce the information (text, graphics, images, illustrations) showing on the monitor on paper, transparencies, and plastic. Such a printout is called a hardcopy. 3. Speaker : A speaker is a device used for
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BASIC Programming Language for SS1

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Computing Devices I ( Pre-Computer to 19th Century) for SS1

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Computing Devices I ( Pre-Computer to 19th Century) for SS1 Man has put every effort to have better method of calculations. As a result of man’s search for fast and accurate calculating devices, the computer was developed. 19 th Century Device Some of the 19 th century devices are: Abacus, Napier’s bones, Pascal’s calculator, Leibniz multiplier Jacquard’s Loom, Charles Babbage’s engine, Hollerith Census machine and Borrough’s machine. Abacus The first calculating device was probably the Abacus. The Chinese invented it. Components: It is made up of frame divided into two parts by a horizontal bar and vertical threads. Each thread contains some beads. It is known as Soroban in Japan and Suan Pan in china. Uses : to do simple addition and subtraction Napier’s Bone : In 1617 an eccentric (peculiar, unusual person) Scotsman mathematician named John Napier invented Logarithm which is a technology that allows multiplication to be performed via addition. Components : A set of eleven rods, wit
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Computer Ethics for JSS 2

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Computer Ethics for JSS 2 Definition of Computer Ethics Ethics is a set of moral principles that govern the behavior of a group or individual. Computer ethics can be defined as the set of moral principles that regulate the use of computers. Responsible use of Computer and Internet The following are the basic security measures taken to prevent damage to computer system. 1. There must be adequate ventilation. 2. Adequate space must be allowed between each system unit. 3. Avoid dust by using cover. 4. Avoid moisture. 5. Provision of air conditioners and fans or other cooling machines. 6. Provision of UPS (Uninterruptible Power Supply) and other electrical appliances to avoid loss of information and electrical damage to the system. 7. Adequate care must be taken to storage devices like diskettes, flash drive, CD/DVD writer drive, etc. 8. Disallow an unauthorized user from having access to your computer. 9. Ensure maximum security to files and information on the computer. 10. Provide comput
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