41. Only three peripherals were released by Microdigital & mdash; a Joystick, a light pen interface and a parallel printer interface. 42. The H�misph�re is a light pen that has a cigar shaped barrel with a beveled top and usual Waterman clip. 43. The first light gun of this type was used on the MIT Whirlwind computer, which used a similar light pen . 44. The MIS system used a light pen to allow physicians and nurses to quickly point and click items to be ordered. 45. Light pen usage was expanded in the early 1980s to personal computers such as the Fairlight CMI, and the BBC Micro.46. Terminals provided data entry capability into mainframes as well as light pen pointing and selection before the mouse was in use. 47. Using a light pen , Sketchpad allowed one to draw simple shapes on the computer screen, save them and even recall them later. 48. And they can use a " light pen " to highlight a paragraph or phrase the way television commentators analyze football plays. 49. In the early 1980s, Gibson was best known for his work on light pen technology for use with Apple and Atari systems. 50. The right monitor, which played the preview video, was used by the editor to make cuts and edit decisions using a light pen .
