Sega Saturn Header Info

Anyone know what these peripherals are W, E, and whatever else (i know that M is for Mouse, S is for Steering wheel, J is for Joystick, K is for Keyboard). Also does anyone know how to make a IP.BIN for the Sega Saturn (i guess that is almost like the Dreamcast IP.BIN from the looks of it)
The most current list of peripheral codes that I've seen is Saturn Technical Bulletin #40, but it doesn't list W or E. You'll find info on the IP.BIN in the documentation package here.