What is (or was) gc_n64_usb? gc_n64_usb if a firmware for Atmel AVR micro-controllers which allows one to connect an Nintendo 64 or Gamecube controller to a PC with ...

The N64 controller data line is connected to PORTB0 (open collector output). The USB D+ and D- lines (connected to PORTD2/INT0 and PORTD4, respectively) are run at 3.3V using zener diodes and ...