The Fanuc A20B-8200-0841 is the main control printed circuit board (A1U variant, often /03A) designed for Fanuc Series 0i-D (0i-TD / 0i-MD) CNC systems. This chassis-mount core PCB integrates the central CPU processing, system logic, memory management, and high-speed interfacing for multi-axis servo control, spindle, I/O, and operator panel communication via FSSB and other proprietary buses. It features industrial-grade components, robust backplane and I/O connectors, and operates on system-supplied voltages with efficient low-power circuitry. [stock available]