Alexander developed Kempston Mouse Interface support for the Spectrum bus in the mamedev/mame repository, delivering a new slot device that enables two-button mouse input with X and Y movement tracking for Spectrum emulation. He approached the task by integrating the interface with the existing slot and device framework, ensuring consistency and stability within the codebase. Using C++ for device driver development and hardware interfacing, Alexander broadened the emulator’s compatibility with user hardware and improved input fidelity. The work focused on expanding input options for Spectrum users, demonstrating depth in low-level programming and careful alignment with established infrastructure over the project month.