page_title: Super Scope
section_title: Hit detection
hierarchical_section_title: Super Scope / Hit detection
caption_attribution_description: The receiver for the Super Scope light gun for the Super Nintendo video game console, plugs into a controller port and is required in order to use the Super Scope.
context_page_description: The Super Scope, sold as the Nintendo Scope in Europe and Australia, is a first party light gun peripheral for the Super Nintendo Entertainment System. The successor to the NES Zapper, the Super Scope was released in North America and the PAL region in 1992, followed by a limited release in Japan in 1993 due to a lack of consumer demand. The peripheral consists of two devices: the wireless light gun itself, called the Transmitter, and a Receiver that connects to the second controller port of the Super NES console. The Transmitter has two action buttons, a pause button, a power switch and is powered by six AA batteries.
context_section_description: The Super Scope makes use of the scanning process used in cathode ray tube monitors, as CRTs were the only affordable TV monitors until the early 2000s. In short, the screen is drawn by a scanning electron beam that travels horizontally across each line of the screen from top to bottom. A fast photodiode will see any particular area of the screen illuminated only briefly as that point is scanned, while the human eye will see a consistent image due to persistence of vision.
  The Super Scope takes advantage of this in a fairly simple manner: it simply outputs a '0' signal when it sees the television raster scan and a '1' signal when it does not. Inside the console, this signal is delivered to the PPU, which notes which screen pixel it is outputting at the moment the signal transitions from 1 to 0. At the end of the frame, the game software can retrieve this stored position to determine where on the screen the gun was aimed. Most licensed Super Scope games include a calibration mode to account for both electrical delays and maladjustment of the gunsight.
  The Super Scope ignores red light, as do many guns of this type because red phosphors have a much slower rate of decay than green or blue phosphors. Since the Super Scope depends on the short persistence and scan pattern of CRT pixels, it will not function with modern displays (such as plasma screens or LCDs) that continuously light each pixel.
caption: The receiver box that plugs into controller port, meant to sit on top of the TV.
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