What's new in 5DO 1.2.1¶

Released: 2026-11-03

5DO 1.2.1 adds arm64 bundles for Windows, Linux, and macOS. It is a packaging update on top of the 1.2.0 feature and accuracy release.

Changes in 1.2.1¶

• Windows arm64 bundle. 5do-1.2.1-win-arm64.zip contains the framework-dependent single-file CLI and desktop app plus the arm64 OpenAL/Skia/HarfBuzz assets.
• Linux arm64 bundle. 5do-1.2.1-linux-arm64.tar.gz contains the arm64 CLI and desktop app with the matching native libraries.
• macOS arm64 bundle. 5do-1.2.1-osx-arm64.tar.gz contains the arm64 CLI and desktop app.
• Six-bundle CI. The release workflow now builds win-x64, win-arm64, linux-x64, linux-arm64, osx-x64, and osx-arm64, and verifies each apphost's PE/ELF/Mach-O machine type. The x64 bundles keep their runtime smoke tests; arm64 bundles are architecture-validated build artifacts because no arm64 runner is available.

Changes in 1.2.0¶

5DO 1.2.0 is a feature and accuracy update on top of the documented-compatibility 1.0.0 release and the 1.1.0 maintenance update. It adds a Windows Direct3D 11 presenter, a fuzz harness, display-refresh control, broader disc support, and a substantial interrupt/DMA/DSP telemetry pass.

• Direct3D 11 presenter (Windows). Optional FL11_0 backend with runtime HLSL palette/filter passes, a DXGI flip-model child swapchain, --gl-backend d3d11, Settings selection, and --d3d-probe/--d3d-window-probe. OpenGL remains the default.
• GitHub release checks. The CLI and desktop app check the public release feed at startup (cached for six hours) and offer the download page. 5do update checks on demand. The check is opt-out via Settings, --no-update-check, or FIVEDO_UPDATE_CHECK=0.
• Fuzzing. tools/FiveDo.Fuzz covers state, disc, CUE, Opera-FS, CD command streams, and ARM60 instruction streams with deterministic seeds and reproduction artifacts. A nightly workflow runs the longer sweep.
• Video presentation controls. Per-edge overscan (0-32 px), per-game crop profiles, and a configurable 0-64 px void border with #RRGGBB/#AARRGGBB color.
• Screenshot gallery. Game/date filters, side-by-side compare, export, and a settings sidecar written beside every capture.
• Display refresh. Settings > Video can present the latest frame at 30-480 Hz or match the display. The 3DO still outputs 60 fields per second (50 for PAL), so this lowers presentation latency but does not add motion.
• Disc support. Flat CHDs with 2048-byte cooked-ISO units are accepted as a single data track, and raw 2352-byte images named .iso are detected by their CD sync header.
• Interrupt and bus accuracy. FIQ request-to-vector latency is measured and traced, CLIO output-FIFO reload and DIPIR-protected XBUS DMA follow Opera, MADAM persists the MCTL-written gate, XBUS device-15 Opera poll/status semantics are implemented, and XBUS state loading rejects mismatched device slots. run --json reports FIQ and DSP timing counters.
• DSP telemetry. Per-tick loop, sleeping, peak, and mean instruction statistics are reported by run --json and the text result.
• Scope. WebAssembly/browser, Android/iOS, and Raspberry Pi targets were removed from the roadmap and release gates. Windows, Linux, and macOS desktop remain the supported platforms.

Six bundles¶

The download is a versioned bundle per system and architecture. Each bundle contains both the desktop app and the headless CLI:

Every bundle contains README.md, LICENSE, THIRD-PARTY-NOTICES.md, whatsnew.md, the release notes, and the legal/OpenAL notices. SHA-256 checksums are attached as SHA256SUMS.txt.

The apps are framework-dependent single-file executables. Install the .NET 10 Runtime from https://dotnet.microsoft.com/download/dotnet/10.0; no .NET runtime is embedded in the executables or copied into the bundle. The OpenAL Soft runtime stays beside the apps so it can be replaced as required by its LGPL license.

PDB and XML documentation files are omitted from the bundles; they are build outputs, not runtime dependencies.

Requirements¶

• The .NET 10 Runtime installed on the host. It is not included in the bundle.
• A legally obtained 1 MB 3DO BIOS ROM (for example panafz1.bin).
• Legally obtained 3DO disc images in ISO, BIN, CUE+BIN, or CHD format.
• Windows 10+, a current Linux desktop, or macOS 12+.
• OpenGL 3.3 or OpenGL ES 3.0/3.1 for GPU presentation; the CPU fallback is always available.

BIOS ROMs and game images are not included.

Verification¶

• Full suite: 1,597 tests passing on Windows (Debug and Release).
• dotnet build reports 0 warnings and 0 errors.
• dotnet format --verify-no-changes is clean.
• jb inspectcode --severity=WARNING reports 0 results.
• CLI selftest and desktop --smoke-test pass for the x64 bundles; all six bundles are built by CI and the arm64 apphosts are architecture-verified.
• 3,000-frame regression hashes for Gex, Lemmings, and Road Rash remain at their documented values.

Known issues¶

• Crash 'n Burn (Japan) remains the single known boot failure (593/594 local discs render).
• Linux GPU presentation is preview/best-effort under llvmpipe; the CPU fallback works.
• Display refresh above 60 Hz is re-presentation, not frame interpolation.
• Full Opera differential evidence for the interrupt, DMA, and CD timing audits remains post-1.2 work.

See the project status, known issues, and compatibility notes for details.