Stuart Inglis enhanced the m6502 CPU core in the mamedev/mame repository by implementing interruptible fetch, data, and write routing, which improved the CPU’s responsiveness during core operations. He approached this by refactoring the access paths to allow for interrupts, ensuring that the system could handle asynchronous events more effectively. To maintain correctness and prevent future regressions, Stuart added a dedicated regression test for the new interruptible access functionality. His work demonstrated strong C++ programming skills and a solid understanding of CPU architecture and embedded systems, with careful attention to code hygiene and maintainability throughout the development process.