| 1. | The light pen itself had a small photoelectric cell in its tip.
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| 2. | Unlike light pens, they are held at a distance from the screen.
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| 3. | The 4551 Light Pen, originally developed for the 611, could also be used.
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| 4. | Outside, a longhorn steer lolled in a brightly light pen.
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| 5. | The computer had a wide selection of ports, including one for a light pen.
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| 6. | The 6845 had support for a light pen, an alternative to a computer mouse.
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| 7. | The light pen / light gun cannot work with modern LCD TVs and monitors.
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| 8. | GW-BASIC allowed use of joystick and light pen input devices.
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| 9. | It beat out trackballs, light pens and small tablets.
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| 10. | The Vectrex light pen was invented by John Ross.
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