A PIC-based hardware modification for the SNES that monitors the buttons pressed on a controller and performs various actions.
NOTE: MY IGR IS DEPRECATED AND I NO LONGER RECOMMEND USING IT. It has several compatibility issues especially with respect to games that do not use Auto Joypad Read (an SNES feature).
I highly recommend using borti4938’s improved uIGR instead. It is based on my code but runs on a faster PIC, has compatibility issues resolved and a number of additional features added.