A fork of NintendoSpy, RetroSpy is designed to present controller inputs from a console or computer in a display window. This allows you to show your controller inputs for things like speedrunning, game tutorials, and more. You can also convert controller presses into keystrokes to control programs on your computer such as LiveSplit and OBS. RetroSpy supports the following systems and their regional equivalents:
Big thanks to Brian Khuu and other contributors for decoding the GBP protocol and making Arduino Game Boy Printer Emulator, which can be found at https://github.com/mofosyne/arduino-gameboy-printer-emulator.