Fanuc A16B-1200-0310 CRT graphic interface puncher PCB (crt/punch). For driving monochrome 9″ graphics on the System 6 series controls, as well offering PC punch (RS232 or tape) comms for the CNC to deal with programs for the machine to execute. Running the 6A control config in which it stores the system memory, ladder, and programs. The A20B-1200-0310 would have run in simpler Fanuc 6M, 6MA, 6T, 6TA controls. DNC offers exchange to save time, and extensive fault testing and repair facilities for the Fanuc 6 CRT/Punch Int and the rest of the Fanuc 6 controller that its attached to.