Information AboutTrackball |
| CATEGORIES ABOUT TRACKBALL | |
| pointing devices | |
| game controllers | |
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A trackball is a Pointing Device consisting of a Ball housed in a socket containing sensors to detect rotation of the ball about two axes—like an upside-down Mouse with an exposed protruding ball. The user rolls the ball with the Thumb , Finger s, or the palm of the Hand to move a Cursor . Large tracker balls are common on CAD workstations for easy precision. Before the advent of the Touchpad , small trackballs were common on Portable Computers , where there may be no desk space on which to run a mouse. Some small thumbballs clip onto the side of the Keyboard and have integral buttons with the same function as mouse buttons. When mice and trackballs still had chopper wheels, trackballs had the advantage of being in contact with the user's hand, which is generally cleaner than the desk or mousepad and doesn't drag lint into the chopper wheels. The late 1990s advent of Scroll Wheel s, and the replacement of mouseballs by direct optical tracking, put trackballs at a disadvantage and forced them to retreat into niches where their distinctive merits remained important. Most trackballs now have direct optical tracking which follows dots on the ball. Some mice, in place of a scroll wheel, acquired a small trackball between the buttons, useful in maps and other circumstances calling for scrolling in two dimensions. SPECIAL APPLICATIONS Large tracker balls are sometimes seen on computerised special-purpose workstations, such as the radar consoles in an Air-traffic Control room or Sonar equipment on a ship or submarine. Modern installations of such equipment may use mice instead, since most people now already know how to use one. However, military mobile anti-aircraft radars and submarine sonars tend to continue using trackballs, since they can be made more durable and more fit for fast emergency use. Large and well made ones allow easier high precision work, for which reason they are still used in these applications (where they are often called "tracker balls") and in Computer-aided Design . Trackballs have appeared in and 5200 consoles had one as an optional Peripheral , with a Joystick as standard. The Bandai Atmark , a Japan ese console introduced in 1995 had a trackball as standard for its Gamepad . Trackballs remain in use in pub golf machines (such as Golden Tee ) to simulate swinging the club. Computer gamers have been able to successfully use trackballs in most modern computer games, including FPS, RPG, and RTS genres, with any slight loss of speed compensated for with an increase in precision. Many trackball gamers are competent at "throwing" their cursor rapidly across the screen, by spinning the trackball, enabling (with practice) much faster motion than can be achieved with a mouse and arm motion. Trackballs are provided as the pointing device in some Public Internet Access Terminals . Unlike a mouse, a trackball can easily be built into a console, and cannot be ripped away or easily vandalised. Two examples are the Internet browsing consoles provided in some UK McDonalds outlets, and the BT Broadband Internet public Phone Box es. Because trackballs for personal computers are stationary, they may require less space for operation than a Mouse , and may simplify use in confined or cluttered areas such as a small desk. ERGONOMICS |
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