During May 2026, contributed to the mamedev/mame repository by implementing support for an undocumented Button 3 in the Cyvern game, enabling an alternate primary weapon fire mode for both players. This work involved updating input port definitions and input mappings to recognize the new button, thereby enhancing emulation fidelity and expanding gameplay options. The feature was developed using C++ with a focus on game development and input handling, aligning with ongoing efforts to improve hardware input mapping and user configurability. All changes were documented and referenced in the project’s issue tracking, ensuring transparency and maintainability within the codebase.