Royal Vendors soda vending machine main control board. This board will work for the following models 500, 550, 650, 660, 804. Pretty sure this board has the eprom chip in it for a royal 660 coke machine. So u will need to pull the eprom off your board and put it in this board if you do not have a 660. Used boards they are dusty don’t expect perfection or don’t buy. Used tested working.