Nintendo Super Nintendo Entertainment System - User Manual

Super Nintendo – InGameReset Functionalities
Force region 50Hz (PAL) (LED green)
L + R + Select + Y
Force region 60Hz (NTSC) (LED red)
L + R + Select + A
Force region of cartridge (LED yellow)
L + R + Select + B
Change to SCICs forced region (e.g. for pairmode with sd2snes)
L + R + Select + D-Pad left OR right

Nintendo Super Nintendo Entertainment System Specifications