Arduino Mega2560 R3 pinouts photo

Using Arduino Microcontrollers
39

CrossRoads:
What does the Mega schematic show?
https://www.arduino.cc/en/uploads/Main/arduino-mega2560_R3-sch.pdf

Thanks for referring to MEGA schematic which shows: Digital Pin-2 receives IRQ-signal for INT-4 of ATmega2650.