Fanuc A20B-0008-0480 Eprom based Fanuc ROM based program storage and editing board. Storing the system software for the controller allowing interaction between all the components of the Fanuc 6 NC with each other and the MC side of the machine tool. The read only memory board allowed the Fanuc 6 Master boards A20B-0008-0410 and A16B-1000-0030 main PCBs to operate with the rest of the parts of the Fanuc 6, 6B, 6BII control system. DNC offer a full service for the A20B00080480 ROM EPROM board, including exchange to save money, and surplus spares are stock dependent. Alternatively if your looking for the latter 6BII system ROM PCB then click on the following part number A20B12000150.