By Kevin Ebenezer, IX-P
Some Output Devices
The plotter is a computer printer for printing vector graphics. In the past, plotters were used in applications such as computer-aided design, though they have generally been replaced with wide-format conventional printers. A plotter gives a hard copy of the output. It draws pictures on paper using a pen. Plotters are used to print designs of ships and machines, plans for buildings and so on.
Optical Mark Reader
The Optical Mark Reader is a device the "reads" pencil marks on NCS compatible scan forms such as surveys or test answer forms. It is the machine that checks multiple choice computer forms.
A trackball is a pointing device consisting of a ball held by a socket containing sensors to detect a rotation of the ball about two axes—like an upside-down mouse with an exposed protruding ball. The trackball's buttons may be situated to that of a mouse or to a unique style that suits the user. Large trackballs are common on CAD workstations for easy precision.