2 new cores have been added for RetroArch Steam.
https://store.steampowered.com/app/2010121/RetroArch__BlueMSX/
https://store.steampowered.com/app/1876450/RetroArch__WASM4/
WASM-4 is a low-level fantasy game console for building small games with WebAssembly. Game cartridges (ROMs) are small, self-contained .wasm files that can be built with any programming language that compiles to WebAssembly.
You can download these cores either from within RetroArch Steam by going to Manage Cores, or by simply downloading them for free from Steam.
If you'd like to learn more about these cores, you can go to our Documentation Center site.
Documentation for the BlueMSX core can be found here.
Documentation for the WASM-4 core can be found here.
There are now 50 cores available in total for RetroArch Steam.