Current Status

Current Status

Reviewed: 2026-08-17 · Public head: 4eda0c4 · Scope: merged public source plus explicitly labelled private-title evidence

Important

Nakagawa is currently validated most deeply against Hot Shots Tennis: Get a Grip, USA (UCUS-98701). It is not general PSP compatibility software and is not a release-accepted end-user package today.

Status dashboard

Capability	State	Current truth
Recompiler pipeline	✅ Working	Public loading, analysis, code generation, native compilation, and source-owned verification paths exist.
Boot, title, and menu route	✅ Working*	Reached by the current state-qualified private HST route. *Private acceptance, not public fresh-machine proof.
Match gameplay	🟡 Partial*	Qualified private runs have completed matches; remaining graphics, audio, timing, and public-workflow defects prevent release acceptance.
Graphics and presentation	🟡 Partial	Substantial software/Vulkan support exists. Transient menu corruption and missing portraits remain open.
Audio	🔴 Open	SAS/mixing, ATRAC3+, and output paths exist, but sustained smooth title audio is not accepted (#67).
Timing and scheduler	🔴 Open	Paced timing and wait handling have improved; delivery/coalescing and broader PSP timing acceptance remain unresolved (#70).
Save/load	🟡 Partial	Runtime filesystem/savedata support exists; the complete public fresh-machine route is not release-accepted.
Native 480x272 host mode	🧭 Planned	The guest framebuffer is 480x272, but a true selectable 480x272/1x host presentation mode is not implemented.
Linux and macOS hosts	🧭 Planned	Portable seams exist; neither platform is supported end-to-end today.
General PSP-title support	🧭 Planned	The architecture is broader than HST, but general compatibility is not claimed.
Public fresh-machine flow	🔴 Open	Public source + user-owned lawful inputs → complete playable acceptance has not yet been achieved.

What is working

• The public source contains the ELF/PRX → image → analysis/CFG/ownership → generated C → native-runtime pipeline.
• HLE, guest memory, scheduler/wait, graphics, audio/media, filesystem, and input layers have substantial implementation and source-owned tests. Unknown or unimplemented NIDs remain visible; a generic success return is not treated as implementation.
• The state-qualified private route from PR #66 reached qualified HST gameplay and completed matches. This is private route evidence, not public release acceptance or PSP hardware proof.
• PR #71 uses NEAREST only for exact positive integer, uniform source-to-viewport scaling; other extents use LINEAR.
• The HST build profile from PR #74 defaults to runtime -O2 and generated code -O1. Generic or unqualified titles remain -O0/-O0, with explicit overrides supported.

Open acceptance items

Area	Evidence boundary and remaining work
🔊 Audio · #67	Rough/stuttering audio remains open. Implemented SAS/mixing, ATRAC3+, and audio-output paths do not by themselves establish sustained smooth playback. Public-safe builds may select explicit unavailable backends for excluded components.
⏱️ Timing · #70	The default paced profile has a rational scheduler-owned 60000/1001 VBLANK source and improved deadline/wait handling from PR #72. Delivery/coalescing under host load remains open; timing is not fully PSP-correct.
🖼️ Graphics · #69	A transient main-menu model/render corruption remains reproducible and under investigation in #69. Its root cause is not publicly established. Mid-game portrait/profile images remain absent.
🧮 VFPU/hardware · #40	PR #58 covers a bounded host accumulation-shape/repaired-probe subset. Issue #40 remains open for broader hardware/topology and overlap questions. Emulator agreement is corroborative, not PSP silicon truth.
📦 Public workflow	A fresh-machine, public-source, user-supplied-input build/play workflow is not release-accepted. Public CI and local checks do not prove private gameplay or hardware acceptance.

Presentation and host platforms

flowchart LR
    A["PSP guest framebuffer<br/>480x272"] --> B["Internal render target<br/>backend-dependent scale"]
    B --> C["Host presentation<br/>resizable 960x544 start"]
    C --> D["Final filtering<br/>integer-uniform: NEAREST<br/>otherwise: LINEAR"]

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Guest framebuffer size, internal render scale, host-window size, and presentation filtering are separate concepts. The current 960x544 start is 2x-style host presentation—not native PSP window sizing.

Host	Status
Windows 11 x64	Current first-class development and validation host.
Linux	Future native target; not currently supported end-to-end.
macOS	Future native target; not currently supported end-to-end.

See the repository's platform-portability plan.

Roadmap

flowchart LR
    A["A · HST research recompiler"] --> B["B · Public HST toolchain"]
    B --> C["C · General Nakagawa recompiler"]
    C --> D["D · Reusable PSP runtime/core"]
    D --> E["E · Decompiler and RE tooling"]

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Later stages are direction, not completed capability. The practical acceptance target is a documented fresh-machine flow that builds from public source and user-owned input, launches a supported title, reaches menus and gameplay, presents correct UI/models/portraits, produces stable audio, offers native and scaled presentation choices, saves/loads, and exits cleanly.

Note

The public repository contains source, tests, synthetic fixtures, and audit/provenance tooling. Users supply lawful title inputs locally. No ISO, decrypted retail modules, generated retail-title C, keys, saves, proprietary assets, private captures, or private traces are distributed.

Continue with Build and Run or the concise Nakagawa case study.