FCEUmm is a Nintendo Entertainment System video game system emulator that can be used as a libretro core.
FCEUmm requires a real BIOS for Famicom Disk System emulation to work.
FCEUmm is able to emulate the Nintendo Zapper accessory in one of two ways.
For standard Famicom/NES ROMs:
- Load a standard Famicom or NES ROM in the FCEUmm core
- Access the RetroArch Quick Menu
- In the Input Settings for User 1, specify a device type of Gamepad
- In the Input Settings for User 2, specify a device type of Zapper
- Exit the Quick Menu
For VS Unisystem ROMs:
- Load a VS Unisystem ROM in the FCEUmm core
- Access the RetroArch Quick Menu
- In the Input Settings for User 1, specify a device type of Zapper
- Exit the Quick Menu