For Use With/on
Trackball, Data Entry, also referenced with federal logistics item name code 37535
- A device which includes a sphere mounted in a small open-topped box. the sphere is hand-operated by rotating it in a backward, a forward, or a sideway direction while maintaining the device in a fixed location. the movement of the sphere generates a signal which may be used to move a cursor and/or tracking symbol on the face of a display, such as a cathode ray tube; to input data into an electronic system; and/or to control the operation of a system. it may or may not include additional input devices, such as switches or variable resistors.