Digital - motor direction IO12 - motor speed IO13 - general lights - fwd light IO15 - rev light IO04 - cab light - ditch lights - firebox light - smoke - front coupler - rear coupler Analog - front IR SVP - rear IR SVN SD Card - SS IO5 - MOSI IO23 - SCK IO18 - MISO IO19 RST -> Vcc IO34 <- DCC interrupt