Fanuc A20B-0008-0500 M-M Interface board. This PCB works within the later SYSTEM 6 controls to give added functionality for PUNCHERS and is the precursor to the MMC system. Normally this board ran on later 6B system versions such as the A20B00080410 masterboard.
DNC offer a full service for the A20B00080500 MM interface PCB. Including exchange to save money, and surplus spares are stock dependent.