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.