Editing NES Zapper (section)

==Operation==
{{Further|Light gun}}
When the Zapper's trigger is pressed, the game causes the entire screen to become black for one frame. Then, on the next frame, all valid targets that are on screen are drawn all white as the rest of the screen remains black. The Zapper detects this change in light level and determines if any of the targets are in its hit zone. If a target is hit, the game determines which one was hit based on the time of the flash, as each target flashes for one video frame, one after another.<ref>{{cite web |last1=Adams |first1=Cecil |title=In Nintendo's "Duck Hunt," how does the TV know when you've hit a duck? |url=http://www.straightdope.com/columns/read/2304/in-nintendos-duck-hunt-how-does-the-tv-know-when-youve-hit-a-duck/ |website=The Straight Dope |date=May 11, 2001 |access-date=February 8, 2019 |archive-date=September 14, 2008 |archive-url=https://web.archive.org/web/20080914194008/http://www.straightdope.com/columns/read/2304/in-nintendos-duck-hunt-how-does-the-tv-know-when-youve-hit-a-duck/ |url-status=live }}</ref><ref>{{cite web |title=How does the light gun for a video game work? |url=https://electronics.howstuffworks.com/question273.htm |website=HowStuffWorks |date=April 1, 2000 |access-date=February 8, 2019 |archive-date=April 30, 2003 |archive-url=https://web.archive.org/web/20030430120815/https://electronics.howstuffworks.com/question273.htm |url-status=live }}</ref><ref name=Patent>{{cite patent | inventor1-last = Okada | inventor1-first = Satoru | title = Video target control and sensing circuit for photosensitive gun | issue-date = March 21, 1989 | patent-number = 4813682 | country-code = US}}</ref>

The Zapper can only be used on [[CRT display]]s; it will not work on [[LCD]]s, [[plasma display]]s or other [[flat panel display]]s due to [[display lag]].{{cn|date=November 2023}}