Fanuc A20B-2900-0531 Fanuc RAM 128KB Memory board. Normally this memory pcb interfaces between Fanuc NC and MC.
Running the 16 control config in which it stores the system memory, ladder, and programs. A20B29000531 simm RAM memory pcb is available today, either as exchange or on an outright basis stock dependent with full testing and repair services are available also. Warranty is 180 days on repair or exchange!