Docs / Third-party notices
Third-party notices
C64 READY.
Copyright © 2026 Morten Øien Eriksen
This product is licensed under the GNU General Public License, version 3 or
later (see the LICENSE file for the full text). It bundles, or builds upon,
the third-party materials listed below; each remains under its own license,
reproduced or linked here as that license requires.
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Fonts (bundled under public/fonts/, shipped in the production build)
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Inter
Copyright © The Inter Project Authors (Rasmus Andersson)
SIL Open Font License, Version 1.1
https://rsms.me/inter/ · https://openfontlicense.org/
File: public/fonts/inter.woff2
Share Tech Mono
Copyright © The Share Tech Mono Project Authors (Carrois Type Design)
SIL Open Font License, Version 1.1
https://fonts.google.com/specimen/Share+Tech+Mono
File: public/fonts/share-tech-mono-400.woff2
PetMe64, Giana, Berkelium64
Copyright © Rebecca G. Bettencourt (Kreative Korporation)
KreativeKorp free-use license (Kreative Software Relay Fonts)
https://www.kreativekorp.com/software/fonts/c64.shtml
Files: public/fonts/PetMe64.ttf, public/fonts/Giana.ttf,
public/fonts/Berkelium64.ttf
The full text of the SIL Open Font License 1.1 and the KreativeKorp free-use
license accompany the font files / are available at the URLs above; the fonts
are redistributed unmodified.
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3D model (bundled, shipped in the production build)
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"Commodore 64 || Computer (Full Pack)"
Copyright © dark_igorek
Creative Commons Attribution 4.0 International (CC BY 4.0)
https://skfb.ly/oUKFx · https://creativecommons.org/licenses/by/4.0/
Files: public/commodore_64.glb, public/commodore_64_4k.glb
Used for the optional 3D Retro Vibes.
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Trademark notice
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Commodore, Commodore 64, C64, 1541, 1702, and related names, logos, trade
dress, and product markings are trademarks or historical marks of their
respective owners. C64 READY. is an independent emulator project and is not
affiliated with, sponsored by, endorsed by, or licensed by any Commodore
trademark owner.
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Bundled software (compiled into the browser app)
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three.js
Copyright © 2010-2026 three.js authors
MIT License — https://github.com/mrdoob/three.js
Lazy-loaded for the attract-mode animation and the 3D Retro Vibes.
(MIT license text reproduced at the bottom of this file.)
Workbox
Copyright © Google LLC
MIT License — https://github.com/GoogleChrome/workbox
Bundled into the production service worker by vite-plugin-pwa so the app
shell can be precached and run offline.
(MIT license text reproduced at the bottom of this file.)
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Ported / derived algorithms and model constants
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jsSID — combined-waveform generator (createCombinedWF)
Copyright © Mihaly Horvath ("Hermit")
MIT-style terms — https://github.com/og2t/jsSID
The synthetic combined-waveform table generator in src/sid-voice.js is a
port of this algorithm.
(MIT license text reproduced at the bottom of this file.)
reSID
Copyright © Dag Lem
GNU General Public License, version 2 or later
https://github.com/daglem/reSID
Portions of the SID implementation are translated from, derived from, or
reimplement reSID algorithms and model constants, including oscillator and
waveform timing, the noise shift-register logic (including TEST-bit fade
behavior), the pipelined ADSR envelope generator (algorithm and timing),
DAC model constants, filter laws, external filter RC constants, and SID
data-bus readback.
The reSID source reference used includes reSID as distributed in VICE's
modified src/resid tree. This project does not embed reSID's measured
combined-waveform lookup tables; combined waveforms are generated by this
project's synthetic model.
VIC-II color palettes — "Pepto" and "Colodore"
Measurement data by Philip Timmermann ("Pepto")
https://www.pepto.de/projects/colorvic/ · https://www.colodore.com
The two selectable VIC-II palettes embedded in src/vic2.js reproduce
pepto's published palette values.
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Reference implementations and calibration sources (not redistributed)
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VICE
Copyright © The VICE Team
GNU General Public License, version 2 or later
https://vice-emu.sourceforge.io/ · https://github.com/VICE-Team/svn-mirror
Used as a behavioral reference, regression oracle, calibration source, and
source reference for VICE's modified src/resid tree. The GCR track-layout
synthesis parameters in src/gcr.js (per-zone tail gaps and the 9-byte
header-to-data gap) follow VICE's D64-to-GCR conversion so that each
sector's GCR framing matches VICE's byte-for-byte. (The whole-track
bitstream still differs: this project does not reproduce VICE's per-track
skew rotation.) This project does not distribute VICE binaries, and VICE's
SID engine wrapper is not ported.
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Development / test tooling (NOT shipped in the app)
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Vite, vite-plugin-pwa, Playwright, pngjs, and marked are used only for building
the app and running the test/diagnostic harnesses under test/ and
investigation/. They are obtained via npm under their own licenses (MIT /
Apache-2.0) and are not reproduced here.
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NOT included — you must supply these
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- Commodore / MOS KERNAL, BASIC, CHARGEN, and 1541 ROMs — copyrighted by their
respective rights holders and NOT distributed with this project. Supply your
own copies.
- Demo / game .prg files referenced under test/ — included for regression
testing only; each remains under its original author's terms. Exclude them
from any binary redistribution.
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MIT License (applies to three.js and the ported jsSID algorithm above)
================================================================================
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.