The repository for the DOS Synth project - a DIY synthesizer which combines the powerful RISC-V microcontroller CH32V307, the RT-Thread RTOS with vintage Yamaha FM synthesis chips to enable musicians and synthesists to control them on a bare-metal level, creating unique and new sounds, with a hands-on focus.
The project runs on the MounRiver Studio IDE and can be used with RT-Thread Studio as well - to use simply clone the project and open it with the aformentioned IDEs, using their Open/Load/Import functionality.
Deeper project information and details are included in the Hackster article.