Update - January, 2022
The emulator is still in development, though in 2021 my time was split between work and contributing to other open source projects. Hopefully I will have more opportunities to work on this project in 2022.
Unfortunately, the pre-alpha release of the emulator had to be removed due to licensing issues with QEMU (which was used for CPU emulation). I have since started replacing QEMU with a custom JIT compiler that should bring the added benefit of full speed emulation.
I intend to release the source code for the emulator as soon as I consider it "shippable". That is, when the core is clearly defined and all essential systems are in place.