The 8BitDo TMR joystick is a GameCube-style joystick replacement for the N64 controller.
Calibration
The joystick has a USB-C port and can be calibrated using the 8BitDo Ultimate Software V2. Plug your device into your computer, run the app, and it should automatically detect it and allow you to update the firmware or calibrate the stick.
Below are results using a N64 controller test ROM. You should instead use Ryzee119's Controller Test ROM, as it is a bit more clear in how it displays the analog stick.
