| 31. | In this case a photosensor in the light pen was connected to the trigger line of the port.
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| 32. | Using a light pen, users could draw lines and arcs that could be related to each other using constraints.
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| 33. | Like the Atari XG-1 light gun, the Stack Light Rifle was treated by the hardware as a light pen.
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| 34. | Pens were once used in many computers instead of mice, from the earliest corded light pens of the 1950s.
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| 35. | The light pen allows the user to " draw ", to create images and to indicate, on the screen.
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| 36. | Witnesses will be able to mark or highlight documents with an electronic " light pen " during their testimony.
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| 37. | Together with light pens and trackballs, it was offered as an optional input device for their system since 1968.
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| 38. | Note that the light pen / light gun input device requires a conventional CRT using a scanning electron beam.
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| 39. | Similarly, graphics tablets and light pens can be used to input these gestures, however these are less common everyday.
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| 40. | In 1979, The Bookseller reported on " the light pen, or ` wand'that could read machine-readable codes on books ."
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