As mentioned in the comments there, there's also now: https://github.com/tkchia/GW-BASIC https://github.com/tkchia/GW-BASIC "All files can now be assembled wi

As mentioned in the comments there, there's also now: https://github.com/tkchia/GW-BASIC https://github.com/tkchia/GW-BASIC "All files can now be assembled with Microsoft MASM 5.1A." "The interpreter is semi-working, but some parts of the platform-specific support code are still missing or incomplete."