JOYSTICKThe joystick consists of a lever that can bemoved in many directions. According to whichway you move it, the joystick tells thecomputer to which direction it has been movedinto. Normally, joysticks also consist of oneor more buttons called triggers whichactivate certain events when pressed. Joysticksare typically used for: Simulations and computer games :
Advantages A joystick allows fast interactions required inmost games. They give a better gaming experience for racingor flying styles of computer games.Disadvantages Some people find joysticks more difficult tocontrol than a traditional mouse. Joysticks are not particularly robust and canbreak easily if too much force is used on them.
SCANNERThe scanner is used to input graphic info intothe computer. In other words, scanners can beused to convert images or text on paper into adigital format that can be used by thecomputer. The scanner works by shining abright beam of light over the surface of theprinted text and images. The light is reflectedback and caught by a sensor. Through thisreflected light, the scanning software can thenbuild the page electronically.
Hand held ScannersYou may use this scanner by holing it in yourhand while dragging it over the document whichyou want to scan. While these scanners aresmall and portable, yet, they cannot scan largeareas at once.Flat bed ScannersThis is the most common type of scanner. Inorder to scan you must lift the lid and placethe document face down onto the glass. The
Advantages Flat bed scanners are very accurate and canproduce reasonably high quality images. Any image which is digitized by the scanner canthen be included on electronic documents. Images once digitized can be enhanced with agraphics application.
Disadvantages Images can take up a lot of memory space. Images lose some quality in the scanning anddigitizing process. The quality of the final image is dependent onthe quality of the original image.
PrinterPrinters produce hard copies of information.The printing speed is calculate in pages perminute ( ppm ), lines per second or characterper second. The resolution is calculated in dotsper inch ( dpi ).
Advantages Permanent output.Disadvantages Time Use of paper Noise
SpeakersMost computers are fitted with a smallinternal speaker which can produce beepingsounds to alert you if you make an error. Fora much higher quality, an external speaker isneeded. A sound card is fitted to the computerto enable sound to be outputed
Advantages Better quality sound.Disadvantages External speakers may take a lot of space.