Cathode ray timing Light gun



the black guncon made namco playstation.



the blue (top) , pink (middle) konami justifiers made super nintendo entertainment system , green (bottom) 1 made playstation


the second method, used super nintendo entertainment system s super scope , computer light pens, more elaborate , more accurate.


the trick method lies in nature of cathode ray tube inside video monitor (crts affordable tv monitors in late 1980s , 1990s, when method popularized). screen drawn scanning electron beam travels across screen starting @ top until hits end, , moves down update next line. done repeatedly until entire screen drawn, , appears instantaneous human eye done quickly.


when player pulls trigger, computer (often assisted display circuitry) times how long takes electron beam excite phosphor @ location @ gun pointed. light gun sends signal after sensing sudden small change in brightness of point on screen when electron gun refreshes spot. computer calculates targeted position based on monitor s horizontal refresh rate (the fixed amount of time takes beam left right side of screen). either computer provides time base horizontal refresh rate through controller s connector (as in super scope), or gun reads composite video signal through t-connector on a/v cable (as in guncon 2). once computer knows gun pointed, can tell through collision detection if coincides target or not.


many guns of type (including super scope) ignore red light, red phosphors have slower rate of decay green or blue phosphors. result, (but not all) games brighten entire screen s green/blue pixels when trigger pulled in order more reliable fix on position.


display timing not possible plasma, lcd, , dlp monitors, since not have off state between refreshes. digital signal processing electronics may introduce nontrivial lag between signal input , display output, not predictable because varies between monitor models , brands , between mode settings of single monitor. lag not significant player feedback may enough destroy accuracy of display-timing based light gun system.







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