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5DO is a modern, source-available C#/.NET 10 emulator for the 3DO Interactive Multiplayer. It combines a deterministic managed emulation core with an Avalonia desktop app, a headless CLI, and a reproducible test harness.

v1.0.0 is released. Download the Windows, Linux, or macOS bundle from GitHub Releases. No BIOS ROMs or game images are included. Supply legally obtained files.

Download

There is one bundle per system, and each bundle contains both the desktop app and the CLI:

System	Bundle
Windows x64	5do-win-x64.zip
Linux x64	5do-linux-x64.tar.gz
macOS x64	5do-osx-x64.tar.gz

The apps are single-file executables. A private .NET 10 runtime is included once under runtime/ and shared by both apps, so no separate .NET install is required.

Start here

• Installation - requirements, first run, data folders.
• Quick-Start - the shortest path from download to gameplay.
• FAQ - BIOS, discs, releases, saves, platforms, and licensing.
• Troubleshooting - common failures and fixes.
• Compatibility - the 594-disc sweep and known limitations.
• Building-from-Source - build, test, and publish commands.
• Contributing - issues, pull requests, and evidence.
• Legal - license, donationware, and trademark rules.

Full documentation

The complete documentation site is https://purelogiccode.github.io/5DO/.

Useful direct links:

• User guide
• CLI reference
• Configuration
• Compatibility notes
• Known issues
• What's new
• Developer guide

Project status

• v1.0.0 documented-compatibility release, published on GitHub.
• 594 disc images swept; after triage, 593 loadable/rendered, 1 known no-video case, 0 not-loadable rows.
• 1,473 tests in the current test assembly.
• Windows x64 validated; Linux x64 full suite and CLI/frontend smoke passed (GPU presentation preview/best-effort); macOS x64 bundle is built and runtime validation is post-1.0.

See Status, What's new, and Roadmap.

Community

• GitHub Discussions
• Issues
• Contributing
• Security policy

5DO is donationware: non-commercial, source-available software. Donations do not grant commercial rights. "3DO" and "Panasonic" are trademarks of their respective owners.