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COMPUTER SYSTEMDefinition: Is a collection of entities(hardware,software and liveware) that are designed come receive, process, manage and present details in a meaningful format.

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COMPONENTS OF computer system SYSTEMComputer hardware - Are physical parts/ intangible components of a computer. Zb Input devices, output devices, central processing unit and storage devicesComputer software - also known together programs or applications. They room classified into two classes specific - sytem software and application softwareLiveware - is the computer system user. Likewise kwon together orgwareor the humanware. The user regulates the computer system system come execute top top instructions.a) computer HARDWARE

Hardware describes the physical, tangible computer equipment and also devices, which carry out support for significant functions such as input, processing (internal storage, computation and also control), output, an additional storage (for data and programs), and communication.

HARDWARE categories (Functional Parts)

A computer system is a set of combined devices that input, output, process, and also store data and also information. Computer systems are right now built approximately at the very least one digital processing device. There are 5 main hardware materials in a computer system: Input, Processing, Storage, Output and also Communication devices.

Are gadgets used because that entering data or instructions come the central processing unit. Room classifie according to the technique they usage to enter data.

a) KEYING DEVICESAre devices used to enter data right into the computer system using a collection of secrets eg Keyboard, key-to- storage and also keypad.i) The keyboard

Keyboard (similar come a typewriter) is the main input maker of a computer . It consists of three types of keys-- alphanumeric keys, special secrets and duty keys. Alphanumeric keys are offered to type all alphabets, numbers and also special symbols prefer $, %,
, A etc. Special keys such as , , , , etc. Are provided for distinct functions. Function keys such as , , etc. Are used to provide special regulates depending upon the software supplied e.g.F5 reloads a page of an internet browser. The function of each and every key can be well understood only after functioning on a PC. When any an essential is pressed, an electronic signal is produced. This signal is recognize by a keyboard encoder that sends a binary code equivalent to the crucial pressed to the CPU. There room many types of keyboards yet 101 keys key-board is the most popular one.

How the secrets are organized

The tricks on your keyboard deserve to be separated into numerous groups based on function:

Typing (alphanumeric) keys. these keys encompass the exact same letter, number, punctuation, and symbol keys found on a classic typewriter.Special (Control) keys. These keys are offered alone or in mix with other keys to perform particular actions. The most generally used manage keys room CTRL, ALT, the windows key, and also ESC.Function keys. The duty keys are supplied to perform particular tasks. They space labelled as F1, F2, F3, and so on, up to F12. The functionality of these secrets differs from routine to program.Cursor motion (Navigation) keys. These keys are used for moving roughly in papers or WebPages and editing text. They include the arrowhead keys, HOME, END, page UP, page DOWN, DELETE, and also INSERT and also ARROW KEYS.Numeric keypad. The numeric keypad is handy because that entering numbers quickly. The keys are grouped together in a block choose a conventional calculator or adding machine.

B. POINTING DEVICESAre devices that get in data and instructions right into the computer system using a reminder that appears on the screen. The items come be gotten in are selected by either pointing come or clicking them.e.g mice, joystick, touch sensitive screen, trackballs i) THE MOUSEA computer mouse is a small an equipment used to allude to and also select items on your computer system screen. Although mice come in countless shapes, the usual mouse walk look a bit like an yes, really mouse. It"s small, oblong, and connected come the device unit by a lengthy wire that resembles a tail and also the connector which can either be PS/2 or USB. Some newer mice room wireless.

A computer mouse usually has two buttons: a primary switch (usually the left button) and also a secondary button. Numerous mice also have a wheel between the 2 buttons, which enables you to scroll smoothly through screens of information.

When you relocate the computer mouse with your hand, a pointer on your display moves in the exact same direction. (The pointer"s appearance might adjust depending on where it"s positioned on her screen.) when you want to pick an item, you allude to the item and then click (press and also release) the major button. Pointing and also clicking with your computer mouse is the main method to communicate with her computer. There space several species of mice: mechanically mouse, optical mouse, optical-mechanical mouse and also laser mouse.

Basic parts

A mouse commonly has two buttons: a primary button (usually the left button) and a second button (usually the ideal button). The primary button is the one you will use most often. Most mice also include a scroll wheel between the buttons to aid you scroll through documents and WebPages much more easily. On some mice, the scroll wheel deserve to be pressed to act as a third button. Advanced mice could have extr buttons that deserve to perform other functions.

Holding and also moving the mouse

Place your mouse beside your keyboard on a clean, smooth surface, such together a computer mouse pad. Organize the mouse gently with your index finger relaxing on the main button and also you thumb resting on the side. To relocate the mouse, slide it slowly in any direction. Don"t twisted it—keep the former of the computer mouse aimed away from you. As you move the mouse, a guideline (see picture) top top your display screen moves in the same direction. If you run out of room to relocate your mouse on your desk or mouse pad, simply pick up the mouse and bring it ago closer to you.

Pointing to an object often discover a descriptive message around it.The guideline can adjust depending on what you"re pointing at. Because that example, when you suggest to a connect in your web browser, the pointer transforms from an arrow to a hand v a pointing finger .

Most mouse actions combine pointing through pressing among the computer mouse buttons. There are four an easy ways to use your mouse buttons: clicking, double-clicking, right-clicking, and also dragging.

Clicking (single-clicking)

To click one item, suggest to the article on the screen, and also then press and also release the primary button (usually the left button).

Clicking is most frequently used to choose (mark) things or open a menu. This is sometimes dubbed single-clicking or left-clicking.


To double-click one item, point to the item on the screen, and then click twice quickly. If the 2 clicks space spaced too far apart, they might be interpreted as two individual clicks fairly than together one double-click.

Double-clicking is most regularly used to open up items on her desktop. Because that example, you can start a regime or open up a folder by double-clicking its icon on the desktop.


To right-click an item, point to the items on the screen, and also then press and release the second button (usually the right button).

Right-clicking an item usually displays a perform of points you can do v the item. For example, when you right-click the Recycle Bin on your desktop, Windows displays a menu enabling you to open it, empty it, delete it, or view its properties. If you room unsure of what to do with something, right-click it.

C) SCANNING DEVICESAre tools that capture an item or a document directly native the source. They are classifie according to the modern technology used to capture data e.g. Scanners and document readers.i) ScannersUsed to record a source paper and converts it right into an electronic form. instance are - FlatBed and also HandHeld scanners.

ii) record readersAre papers that reads data directly from source paper and convey them as input in the type of digital signal. ETypes of record Readersi) Optical Mar leader (OMR)
ii) Barcode readers
iii) Optical character Readersb) Magnetic readers
Reads data utilizing magnetic ink.t offers principle that magnetism to sense data which have been written using magnetised ink.
Is the brain or the heart of a computer. Is likewise known together processor and consist of 3 units namely - i) manage Unit ( C U) ii) Arithmetic reasonable Unit ( A l U) iii) key Memory unit ( M M U)
The mechanism unit is the main point of a computer system. Commonly it"s a rectangular box put on or underneath her desk. Inside this box are countless electronic contents that process data. The most essential of these materials is the central processing unit (CPU), or microprocessor, i m sorry acts together the "brain" of her computer. One more component is random accessibility memory (RAM), i beg your pardon temporarily stores details that the CPU uses while the computer system is on. The info stored in lamb is erased as soon as the computer is turn off.

Almost every other part of your computer system connects come the system unit using cables. The cables plug into specific ports (openings), commonly on the back of the system unit. Hardware the is not part of the device unit is sometimes called a peripheral device. Peripheral tools can it is in external such as a mouse, keyboard, printer, monitor, outside Zip drive or scanner or internal, such as a CD-ROM drive, CD-R drive or interior modem. Internal peripheral devices are frequently referred to as integrated peripherals.

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There are two types according to shape: tower and also desktop.

Tower system Unit desktop System Unit

A motherboard (mainboard, system board, planar board or logic board) is the main printed circuit board discovered in computers and other expandable systems. The holds many of the crucial electronic materials of the system, such together the main processing unit (CPU) and memory, and also provides connectors for various other peripherals.


MotherboardTYPES the PROCESSORS I) Comples Instruction collection Computers (CISC) ii) reduced Instruction collection Computers (RISC)FUNCTIONS OF main PROCESSING UNIT- process data- manage sequence of operaions within the computers - It gives command to all parts of a computer- It manage the use of the key memory in storing of data and instructions- it provides temporary storage (RAM) and permanent storage(ROM) that dataTHE regulate UNITIs the center of operations because that the computer system system, that directs the tasks of the computer system.Funlctions of manage Unit