c64js

What c64js is

c64js is an early Commodore 64 emulator written in JavaScript, with a browser demo for trying ROMs. To run a supported program, users drop a .prg file onto the emulator canvas. The project presents the demo as a proof of concept rather than a fully working emulator. It does not yet emulate the SID sound chip, and some graphical modes of the VIC-II chip are unsupported. The maker says not every ROM will run flawlessly because the emulator does not implement all features of the original hardware; the project also notes that only a limited number of ROMs work. The demo recommends SoS's Flappy Birds implementation as an example to try. c64js is free, available for web use or self-hosting, and released under the MIT license. The repository welcomes contributions and links to contribution guidelines. For a local build, its instructions call for installing npm packages and building the distribution with gulp.