FANUC A20B-3300-0603 is a Main CPU PCB designed for FANUC Series 16i/18i/21i CNC control systems, serving as the central processing platform for CNC program execution, motion interpolation, PMC ladder control, and machine communication. The board integrates a Pentium-class processor, high-speed memory architecture, and embedded PMC functionality, enabling reliable real-time control, rapid data processing, and stable operation in advanced CNC machining applications. It functions as a core controller board within FANUC i-Series systems. [stock available]