The Fanuc A20B-1001-0870 is a 1MB ROM File printed circuit board (often /02A variant) designed for Fanuc Series 0-B/0-C CNC systems and associated CRT/MDI units. This plug-in memory module stores system firmware, graphic programs, and control files in EPROM/ROM chips, enabling reliable program storage, editing, and communication between the CNC control and graphics/MDI interface. It features industrial-grade memory devices, robust edge connectors for direct motherboard or CRT/MDI integration, and low-power operation on system-supplied voltages. [stock available]