79403b5737
The capture reached the title AFTER the harness stopped classifying, so the plate's ramp was in the log with tick stamps after all. ptbtn00: alpha 11->231 over 334.4 guest ms = 657.9 alpha/s. With its independently attested T=22 that is 56.8 units per guest second, inside the pre-registered 55-65 band. The final step of every ramp is excluded because it clamps at 255 and reports more elapsed time than it consumed -- including it drags the plate to 633.0 alpha/s, a 4% error entirely inside the clamp. Control passes at 1.15%: ptcopyright gives 650.4 alpha/s, and at one shared clock that makes its own segment T=22.25. Two elements agreeing on a rate AND independently landing on a round declared length is stronger than either. Why my earlier 29.9 was wrong, and it is the failure the page predicted: it used T=15 borrowed from a row that is about A element with a 15-unit fade, generalised to splash B's quads, which is not what that row says. At 56.8 the splash elements' implied T is 23-34, none of them 15. And the step quantum does not rescue 15: splash steps are multiples of 17 = 255/15, which is what made 15 look confirmed, but at T=28.5 a step of 17 is simply TWO units of 8.9. A quantum fixes T only if you already know the step is one unit. 60 is NOT refuted -- 5.6% away against ~5% quantisation resolution -- so the port keeps it. But this DOES eliminate the unit constant as a cause of a late plate: at 56.8 units/s t=236 lands at 4.15 s against the port's 3.93 s, so the port is fractionally early.
Sylpheed
A clean-room reverse engineering and port project for Project Sylpheed: Arc of Deception (Xbox 360, 2007).
Three things live here, in one repository so that a change spanning them lands as one commit:
| The decoders | crates/sylpheed-formats — the disc's formats, read and verified disc-wide |
| The port | port/ — a Godot 4 project, plus crates/sylpheed-export which converts a disc into the open asset tree it reads |
| The corpus | docs/re/ — what has been reverse engineered, with its evidence, its retractions and its dead ends |
You need your own copy of the game. No game content is in this repository and none ever will be. The exporter reads the disc you supply.
The oracle is the real game
sylpheed-cliand the Explorer are tools for verifying our decoding. They are hypotheses under test and they have been wrong. When something must be checked against the truth, the truth is the game running in Xenia Canary, captured — not any renderer of ours.
This is stated first because getting it backwards is the most expensive mistake this project has made.
Layout
crates/
sylpheed-formats/ the decoders. Disc-wide verified; the corpus is its spec
sylpheed-cli/ headless tools -- render a screen, dump a table, probe audio
sylpheed-viewer/ the Explorer: a human's window onto the disc. STATIC data only
sylpheed-export/ disc -> the open, moddable asset tree
port/ the Godot 4 project. Reads open formats ONLY
authored/ decisions that are NOT on the disc, each with its reason
data/
base/ generated by the exporter. Gitignored, never hand-edited
mods/ drop-in overrides. Yours
docs/
re/ the corpus: findings, refutations, method traps
game/ how the game is navigated -- menus, modals, flight
port/ the port's mission, its handoff contract, modding rules
agents/ how the agent team works together
tools/ capture harnesses, probes, the share tool
exchange/ transient inter-agent files. NOT in git
docker/ the agent containers
Where to start
docs/re/INDEX.md— what is decodeddocs/re/REFUTED.md— what has been tested and dieddocs/re/METHOD.md— traps this project has already paid fordocs/game/navigation.md— how the game is navigateddocs/port/MODDING.md— why the asset tree looks the way it does
Xenia Canary is a separate repository: it is a fork tracking upstream, and it carries our instrumentation.
Conventions
Confidence is per claim, never per document: ✅ CONFIRMED · 🟡 PROBABLE ·
❔ HYPOTHESIS · ❌ REFUTED. A withdrawn result is kept with its reasoning
rather than deleted — that is why the numbers here can be trusted.