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Chasing F1 I examined a counter block I had skipped. this+0x10 decrements every update and fires output bit 0x4 at zero, guarded against the HELD word by cfg +0xA0; it is re-armed from +0xC4 = 10 and +0xC8 = 8. So my statement that "the only two timed inputs in the whole decoder are LB and LT" is false, and two constants I tabulated as ring-word button masks (B|Y and Y) are counter reload values. A number that is a valid mask AND a valid duration cannot be told apart by its value, only by its use, and I classified those two by value. What it does not change: F1 is still not answered. This channel is guarded by cfg +0xA0 = ring bit 1 = B, not a direction. The D-pad and left-stick paths still carry no counter, so "a held DIRECTION has no repeat timer in C_PAD_DECODER" stands, and the human's observation that it repeats in the real game is consistent with the caveat this page already carried: the repeat is in the layer above. Explicitly NOT offering 10 and 8 as F1's two numbers. They belong to a channel on a button that is not a direction, and at 60 units/s they are 0.167 s and 0.133 s -- about 7 moves a second, which does not match "a medium pace, slow enough to see which item is selected". Reporting them as the menu repeat would be the same read-a-config-infer-a-behaviour error this correction is about. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Jc4pciRArGHfxGGhEbwp5t
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.