c64js

Spec sheet

Purpose

c64js is an early Commodore 64 emulator written from scratch in JavaScript.Read 10 Oct 2026 · github.com

License

The code and documentation are released under the MIT license.Read 10 Oct 2026 · github.com

Maker

The project copyright and GitHub profile identify Mikael Borgbrant; the profile lists Stockholm, Sweden.Read 9 Oct 2026 · github.com

Build

The README says to install npm packages with npm install and build the distribution with gulp.Read 10 Oct 2026 · github.com

Compatibility

The project says not all ROMs execute flawlessly because not every feature of the original hardware is implemented.Read 10 Oct 2026 · mborgbrant.github.io

Contributions

The project welcomes contributions and links to contribution guidelines.Read 10 Oct 2026 · github.com

Demo

The project links to a browser demo hosted on GitHub Pages.Read 10 Oct 2026 · github.com

Emulation status

The project describes itself as a proof of concept rather than a fully working emulator.Read 10 Oct 2026 · mborgbrant.github.io

Example

The demo page recommends SoS's Flappy Birds implementation for trying a game in the emulator.Read 10 Oct 2026 · mborgbrant.github.io

Graphics limits

Some VIC-II graphical modes are not emulated, and only a limited number of ROMs work.Read 10 Oct 2026 · github.com

Graphics support

Some graphical modes in the VIC-II chip are not emulated, and the repository says the chip is not fully emulated.Read 9 Oct 2026 · mborgbrant.github.io

Implementation

The emulator is written in vanilla JavaScript.Read 10 Oct 2026 · github.com

Intended audience

The project presents an emulator demo for trying C64 ROMs and games in a browser.Read 9 Oct 2026 · mborgbrant.github.io

Proof of concept

The demo page says the emulator is a proof of concept rather than a fully working emulator.Read 9 Oct 2026 · mborgbrant.github.io

ROM compatibility

The maker says not all ROMs will run flawlessly because not every feature of the original hardware is implemented.Read 9 Oct 2026 · mborgbrant.github.io

ROM loading

Users can run ROM files in .prg format by dropping them on the emulator canvas.Read 10 Oct 2026 · github.com

Sound

The SID chip for sound is not emulated.Read 10 Oct 2026 · mborgbrant.github.io

Sound support

The SID chip, which handles sound, is not emulated yet.Read 9 Oct 2026 · mborgbrant.github.io

Where Specifiction places it

• Commodore 64 Emulators#15 of 317.2