Hardware & Software
The term hardware refers to the physical components of your computer such as the system unit, mouse, keyboard, monitor etc. The software is the instructions that makes the computer work. Software is held either on your computers hard disk, CD-ROM, DVD or on a diskette (floppy disk) and is loaded (i.e. copied) from the disk into the computers RAM (Random Access Memory), as and when required.
Types of Computers
Mini and Mainframe Computers
Very powerful, used by large organisations such an banks to control the entire business operation. Very expensive!
Personal Computers
Cheap and easy to use. Often used as stand-alone computers or in a network. May be connected to large mainframe computers within big companies.
Hardware Components
Input Devices
--"How to tell it what to do“-A keyboard and mouse are the standard way to interact with the computer. Other devices include joysticks and game pads used primarily for games.
Output Devices
--"How it shows you what it is doing"-The monitor (the screen) is how the computer sends information back to you. A printer is also an output device.
Hardware Components
INPUT DEVICES
---The Mouse
Used to ‘drive’ Microsoft Windows.
---The keyboard
Is still the commonest way of entering information into a computer Tracker Balls an alternative to the traditional mouse and often used by graphic designers.
---A scanner
Allows you to scan printed material and convert it into a file format that may be used within the PC.
---Touch Pads
A device that lays on the desktop and responds to pressure Light Pens Used to allow users to point to areas on a screen.
---Joysticks
Many games require a joystick for the proper playing of the game.
OUTPUT DEVICES
VDU
The computer screen is used for outputting information in an understandable format.
Printers
There are many different types of printers. In large organizations laser printers are most commonly used due to the fact that they can print very fast and give a very high quality output.
Plotters
A plotter is an output device similar to a printer, but normally allows you to print larger images.
Speakers
Enhances the value of educational and presentation products.
Speech synthesisers
Gives you the ability to not only to display text on a monitor but also to read the text to you
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MOUSE The mouse, sometimes called a pointer, is a hand-operated input device used to manipulate objects on a computer screen. Wheth...
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A computer is a device that can be instructed to carry out arbitrary sequences of arithmetic or logical operations automatically
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