The Fanuc A20B-2902-0501 is a combined memory module (often /01A daughter board variant) designed for Fanuc Series 16/18/21 and compatible CNC systems. It integrates 8MB FROM (Flash ROM) for non-volatile storage of system software, part programs, and parameters with 256K battery-backed SRAM for real-time data retention and machining information during power interruptions. This plug-in PCB features industrial-grade memory chips, robust edge connectors for direct motherboard integration, and low-power CMOS circuitry operating on system-supplied voltages. [stock available]