I saw 555 being used to implement the "Turbo" buttons in these old 8-bit pads for NES clones and similar. Also, I think that the mythic Gravis game pad uses a 5

I saw 555 being used to implement the "Turbo" buttons in these old 8-bit pads for NES clones and similar. Also, I think that the mythic Gravis game pad uses a 555 to implement the same function when it is in two button mode.