WIMP – Windows icons menus pointer (Windows icon mouse pull down menu) it was used early in the 1990’s. GUI (Graphics User Interface) How a mouse works – the mouse uses a ball under it which can move north, south, east and west. As the axis pulses are sent to the computer. Mouse o A mouse is a pointing device which is the second most common input device. o A flat surface is needed for the mouse to function properly. o A small ball moves and the movements are detected by the way the ball was turning.
o A small arrow moves around the screen using a special ‘mouse driver’. This shows the mouse cursor on the screen. o A mouse has at least 2 buttons. A left button and a right button. The left button is normally used to make selections.
The right one is used for Pop down Menus, which change according to the application being used. o Touch pads and trackballs are two more pointing devices. They are used instead of a mouse. Advantages and Disadvantages o Allows different data to be put and point of the page. o Good for selecting items from menus. o Small o Difficult co-ordinations at first.
o Needs a flat space. o Dust interferes with use. Joysticks o The joystick is usually used for computer games and controlling the way something moves. o There are 3 movements, up and down or side to side and diagonally.
... advantage of whatever free business counseling is available. The Small Business Administration published many excellent booklets, checklists and brochures ... certainly before they could get out of hand. Many small companies set up advisory boards of outside professional people. ... a time of emergency. Anytime you commit yourself and move ahead without completely investigating all the angles, and ...
A jump or a gun can be activated by the button which is usually on the joystick. Advantages and Disadvantages o Better simulation. o Specialized used. o Limited use. Touch Screens o When you touch anywhere on the screen it will be detected. o There are many different ways this can be done: o Infra-Red light shines from the top of the screen to the bottom and from side to side.
The screen is divided into a grid and which ever part of the screen you touch the action will happen in. o Touch Screens can also be used in restaurants or fast food chains because it’s easier than using a whole computer to input data. Only selected items are on the screens which are particular to the specific job. Digital Cameras o A digital camera can store a lot more pictures than an ordinary camera. o Pictures are stored in the floppy-disks or memory cards and can be transferred to the computer. o Light passes through the lenses.
This is how the picture is taken. o A grid of light sensors is involved. o Different binary patterns are used to decide the colours of the picture. o Pictures can be easily saved and changed and edited on the computer. o Some digital cameras also have film o They are quite expensive.
Advantages and Disadvantages o No need to scan pictures. o No development time or cost. o Images can be easily edited. o Resolution not as good as an ordinary camera. o Can be expensive – up till $1000. Scanner o A scanner is used to transfer pictures and text in to a computer.
o There are two types of scanners, hand held and flat bed. o Scanners work when beams of light pass over an image. o Different amounts of light refer to the picture. The data is used to produce a digital image of the picture that the computer displays on the screen. o The data is saved and can be changed.
o You can covert the digital image of text into the text on the screen. Advantages and Disadvantages o Saves people having to hand draw images to illustrate typed text. o Scanned images are more accurate than clip-art. o Difficult to learn how to use. o Some images can take up a lot of space.
... formed on TV screen. The image on the screen changes 25 times a second ... and, since we can't detect individual pictures moving at ... the screen of the picture tube in exactly the same way that it scanned the target of the camera tube and a picture is ...
o Used to be difficult to connect and takes up a lot of space.