Check the listing for details. InOne OneBoard Control/Display Board Retrofit Kit for Royal Merlin IV. Condition: New. Listed at 499.99 USD. InOne Technology OneBoard retrofit kit for Royal Merlin IV soda vending machines. These kits are compatible with all existing hardware, bill acceptor, coin mech, and drop sensor in your machine. Included in this kit are all the parts and mounting hardware needed to upgrade your Royal Vendors soda machine currently using a Merlin IV control board to the latest in control board technology (including a new digital display). Included are OEM drop sensor compatibility, MDB and DEX compatibility, advanced pricing options, auditing, advanced programming options, 24 volt MDB currency peripheral operation, a new digital display that is always on displaying a customer message, capability to add a credit card reader at any time, and so much more! Replacement control boards from Royal for the Merlin IV venders are expensive or unavailable, so this kit is a great option if you are in need of a new control board and/or display. Note: This kit only operates 24/34 volt MDB interface bill acceptors and coin mechs.