| 21. | The system used a light pen to draw on the screen of a 2250 Graphical Display Unit.
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| 22. | A light pen was provided as a pointing device, serving the function of the modern computer mouse.
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| 23. | This contains the horizontal color clock position when the light pen / light gun trigger is pressed.
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| 24. | See Lunar Lander for an example of a light pen in action on a vector graphics system.
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| 25. | Light pens were directly supported as well.
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| 26. | Ivan Sutherland used a light pen in his programs as did Jack Gilmore and others before him.
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| 27. | Light pens and guns cannot be used on fixed-pixel displays because they have no electron beam to detect.
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| 28. | Attorneys at the podium, or witnesses on the stand, can use light pens to " mark " exhibits.
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| 29. | Input was via a combination of light pen for pointing, and the PDP-1's front panel switches for commands.
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| 30. | In fact, all lightgun games for the XEGS could be played with the light pen and vice versa.
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