feat: say when a boot ran the built-in BIOS

region_check and the site name a boot on the core's built-in BIOS as such: the other regions' files were refused. A boot is called another region's BIOS only when the core's log names that file, and a boot whose log names no BIOS says so.

scripts/region_check.py

@@ -144,7 +144,8 @@ def outcome(records: dict[str, dict], entries: list[dict], region: str) -> dict:
             continue
         loaded = all(rep.get("loaded") for v in record["variants"] for rep in v["repetitions"])
         item = {"record": record["id"], "verdict": verdict(record), "loaded": loaded,
-                "staged": sorted(record["variants"][0]["system_files"])}
+                "staged": sorted(record["variants"][0]["system_files"]),
+                "bios_used": record["variants"][0].get("bios_used", "unknown")}
         if full and label != "full":
             item["as_full"] = loaded and frames(record) == frames(full)
         results[label] = item
@@ -173,22 +174,48 @@ def outcome(records: dict[str, dict], entries: list[dict], region: str) -> dict:
         "own_boots": boots("own"),
         "others_boot": boots("others"),
         "pack_boots": boots("pack"),
+        # The BIOS each ran, from its log: a boot is not the staged file's
+        # until the log names it (core_probe.bios_used).
+        "own_on": (results.get("own") or {}).get("bios_used", "unknown"),
+        "others_on": (results.get("others") or {}).get("bios_used", "unknown"),
         "judged_by": "verdict" if full_verdict not in (None, "unknown") else "full_run_frames",
     }
 
 
+BUILTIN = "builtin"
+
+
+def staged_name(used: str | None) -> str | None:
+    """The file a bios_used names, or None."""
+    return used.removeprefix("staged:") if used and used.startswith("staged:") else None
+
+
 def sentence(game_region: str, result: dict) -> str:
-    """The outcome in words, for the site."""
+    """The outcome in words, for the site. A boot is said to be another
+    region's BIOS only when the core's log names that file: a core that
+    refuses the staged files and runs its own BIOS (OpenBIOS, HLE) boots
+    too, on that built-in BIOS."""
     word = REGION_WORDS.get(game_region, game_region)
     own, others = result.get("own_boots"), result.get("others_boot")
     if own is None:
         return f"The {word} game has no run with its own BIOS yet."
-    first = f"The {word} BIOS {'boots' if own else 'does not boot'} the {word} game"
+    if own and result.get("own_on") == BUILTIN:
+        first = f"The {word} game boots on the core's built-in BIOS, its own BIOS file was refused"
+    else:
+        first = f"The {word} BIOS {'boots' if own else 'does not boot'} the {word} game"
     if others is None:
         return first + ". The other regions' BIOS have no verdict yet."
-    if others:
-        return first + ", and so do the other regions' BIOS."
-    return first + ", the other regions' BIOS do not."
+    if not others:
+        return first + ", the other regions' BIOS do not."
+    used = result.get("others_on")
+    if used == BUILTIN:
+        return (first + ". With only the other regions' files it boots on its built-in BIOS, "
+                        "the other regions' files were refused.")
+    name = staged_name(used)
+    if name:
+        return first + f", and so does {name}, another region's BIOS."
+    return (first + ". With only the other regions' files staged it boots too, on a BIOS "
+                    "its log does not name.")
 
 
 # --------------------------------------------------------------------------

scripts/sitemeasurements.py

@@ -75,9 +75,21 @@ def permalink(repo: str, commit: str, path: str, line: int | None = None) -> str
     return f"{repo}/blob/{commit}/{path}" + (f"#L{line}" if line else "")
 
 
+BOOTS_BUILTIN = "boots on built-in BIOS"
+
+
+def shown_verdict(variant: dict) -> str:
+    """A variant's verdict as the pages say it: a boot on the core's
+    built-in BIOS is named so, never taken for the staged file's."""
+    if variant["verdict"] == "boots" and variant.get("bios_used") == "builtin":
+        return BOOTS_BUILTIN
+    return variant["verdict"]
+
+
 def verdicts_of(record: dict) -> list[dict]:
-    """Each variant's boot verdict, from record version 4 on."""
-    return [{"variant": v["label"], "verdict": v["verdict"],
+    """Each variant's boot verdict, from record version 4 on, and the BIOS
+    it ran from version 5 on."""
+    return [{"variant": v["label"], "verdict": shown_verdict(v), "bios_used": v.get("bios_used", "unknown"),
              "detail": (v.get("verdict_evidence") or {}).get("detail", "")}
             for v in record["variants"] if "verdict" in v]
 
@@ -537,17 +549,33 @@ REGION_SHORT = {"japan": "Japanese", "north-america": "US", "europe": "European"
 OUTCOME_WORDS = {True: "boots", False: "does not boot", None: "no verdict"}
 
 
+def others_words(result: dict) -> str:
+    """What the run with only the other regions' files did, never calling a
+    boot the other region's BIOS unless the core's log names that file."""
+    boots = result.get("others_boot")
+    if boots is not True:
+        return f"{OUTCOME_WORDS[boots]} with only the others"
+    used = result.get("others_on")
+    if used == "builtin":
+        return "boots on its built-in BIOS with only the others, which were refused"
+    if used and used.startswith("staged:"):
+        return f"boots on {used.removeprefix('staged:')} with only the others"
+    return "boots with only the others, on a BIOS its log does not name"
+
+
 def core_region_line(results: list[dict]) -> str:
     """One core's outcome over its region games, in a sentence: each game
-    on its own BIOS, then on the other regions' BIOS."""
+    on its own BIOS, then with only the other regions' files."""
     own = {r["own_boots"] for r in results}
     others = {r["others_boot"] for r in results}
-    if own == {True} and others == {True}:
-        return "Each region's game boots on its own BIOS and on the other regions' BIOS."
+    builtin = {r.get("others_on") for r in results} == {"builtin"}
+    if own == {True} and others == {True} and builtin:
+        return ("Each region's game boots on its own BIOS. With only the other regions' files it "
+                "boots on its built-in BIOS: those files were refused.")
     if own == {True} and others == {False}:
         return "Each region's game boots on its own BIOS only."
     parts = [f"{REGION_SHORT.get(r['region'], r['region'])} game: {OUTCOME_WORDS[r['own_boots']]} "
-             f"on its BIOS, {OUTCOME_WORDS[r['others_boot']]} on the others" for r in results]
+             f"on its BIOS, {others_words(r)}" for r in results]
     return ", ".join(parts) + "."
 
 
@@ -854,6 +882,7 @@ def _short(commit: str | None) -> str:
 # A verdict or a comparison, as the block says it: words and a chip kind.
 RESULT_WORDS = {
     "boots": ("works", "success"),
+    BOOTS_BUILTIN: ("works on its built-in BIOS", "success"),
     "bios_error": ("BIOS error", "danger"),
     "crash": ("crash", "danger"),
     "hang": ("hang", "warning"),
@@ -1023,9 +1052,9 @@ def variant_groups(record: dict) -> list[dict]:
     if all("verdict" in v for v in record["variants"]) and (
             record["kind"] == "run" or check.get("observable") == "frame_hashes"):
         for variant in record["variants"]:
-            position.setdefault(variant["verdict"], len(position))
-            result[variant["label"]] = RESULT_WORDS[variant["verdict"]][0]
-        groups = {v["label"]: position[v["verdict"]] for v in record["variants"]}
+            position.setdefault(shown_verdict(variant), len(position))
+            result[variant["label"]] = RESULT_WORDS[shown_verdict(variant)][0]
+        groups = {v["label"]: position[shown_verdict(v)] for v in record["variants"]}
     else:
         groups = {}
         for number, group in enumerate((check.get("result") or {}).get("groups") or ()):

tests/test_measurements.py

@@ -252,6 +252,29 @@ class ReadAndIndex(Workspace):
         self.assertEqual([(g["variant"], g["result"], g["group"]) for g in groups],
                          [("v0", "works", 0), ("v1", "hang", 1)])
 
+    def test_a_boot_on_the_built_in_bios_is_named_so(self) -> None:
+        import core_probe  # noqa: PLC0415
+
+        record = full_record("alpha", "region-x-game-others", "2026-10-28T10:00:00+00:00",
+                             kind="run", observable="frame_hashes")
+        oracle = {"references": [{"sha1": "1" * 40, "stage": "game", "shows": "the title"}],
+                  "error_patterns": [], "error_screens": [], "bios_patterns": [],
+                  "fallback_patterns": [r"^Firmware is missing: "], "load_patterns": []}
+        for variant in record["variants"]:
+            for rep in variant["repetitions"]:
+                rep["logs"] = [{"frame": 0, "level": "info", "text": "Firmware is missing: scph5501.bin"}]
+                core_probe.judge_repetition(rep, oracle)
+            core_probe.judge_variant(variant)
+        self.assertEqual(record["variants"][0]["bios_used"], "builtin")
+        status, statement = sm.result_of(record)
+        self.assertEqual(status, sm.BOOTS_BUILTIN)
+        self.assertIn("built-in BIOS", statement)
+        item = {**SitePages.ITEM, "host_short": "h", "kind": "run", "status": status, "statement": statement,
+                "groups": sm.variant_groups(record), "verdicts": sm.verdicts_of(record)}
+        text = "\n".join(sm.tested_section("alpha", [item]))
+        self.assertIn("works on its built-in BIOS", text)
+        self.assertNotIn("other region", text)
+
     def test_links_name_the_last_commit_that_touched_the_records(self) -> None:
         first = self.repository()
         (self.tree / "other.txt").write_text("x")

tests/test_region_check.py

@@ -27,9 +27,10 @@ PROFILE = {
 
 
 def record(rid: str, staged: list[str], opened: list[str], hashes: list, verdict: str = "unknown",
-           loaded: bool = True) -> dict:
+           loaded: bool = True, bios_used: str = "unknown") -> dict:
     return {"id": rid, "variants": [{
-        "label": "default", "verdict": verdict, "system_files": {name: "0" * 40 for name in staged},
+        "label": "default", "verdict": verdict, "bios_used": bios_used,
+        "system_files": {name: "0" * 40 for name in staged},
         "repetitions": [{"loaded": loaded, "files_opened": [{"path": p} for p in opened],
                          "observables": {"frame_hashes": hashes}}]}]}
 
@@ -145,8 +146,34 @@ class Outcome(unittest.TestCase):
                    "own": record("o", ["scph5502.bin"], [], [[0, "a"]], "boots"),
                    "others": record("x", ["scph5501.bin"], ["scph5501.bin"], [[0, "a"]], "boots")}
         result = rc.outcome(records, self.ENTRIES, "europe")
+        # The log names no BIOS: the boot is not said to be the other region's.
         self.assertEqual(rc.sentence("europe", result),
-                         "The European BIOS boots the European game, and so do the other regions' BIOS.")
+                         "The European BIOS boots the European game. With only the other regions' files "
+                         "staged it boots too, on a BIOS its log does not name.")
+        records["others"] = record("x", ["scph5501.bin"], ["scph5501.bin"], [[0, "a"]], "boots",
+                                   bios_used="staged:scph5501.bin")
+        self.assertEqual(rc.sentence("europe", rc.outcome(records, self.ENTRIES, "europe")),
+                         "The European BIOS boots the European game, and so does scph5501.bin, "
+                         "another region's BIOS.")
+
+    def test_a_boot_on_the_built_in_bios_is_never_another_regions(self) -> None:
+        """Beetle PSX logs "Firmware is missing" and maps OpenBIOS: the other
+        regions' files were opened, hashed and refused."""
+        records = {"full": record("f", self.ALL, self.ALL, [[0, "a"]], "boots",
+                                  bios_used="staged:scph5501.bin"),
+                   "own": record("o", ["scph5501.bin"], ["scph5501.bin"], [[0, "a"]], "boots",
+                                 bios_used="staged:scph5501.bin"),
+                   "others": record("x", ["scph5500.bin", "scph5502.bin"], ["scph5500.bin", "scph5502.bin"],
+                                    [[0, "a"]], "boots", bios_used="builtin")}
+        result = rc.outcome(records, self.ENTRIES, "north-america")
+        text = rc.sentence("north-america", result)
+        self.assertEqual(text, "The US BIOS boots the US game. With only the other regions' files it "
+                               "boots on its built-in BIOS, the other regions' files were refused.")
+        self.assertNotIn("so do the other regions", text)
+        import sitemeasurements as sm
+        line = sm.core_region_line([result])
+        self.assertIn("built-in BIOS", line)
+        self.assertNotIn("on the other regions' BIOS", line)
 
     def test_no_own_run(self) -> None:
         self.assertEqual(rc.sentence("japan", rc.outcome({}, self.ENTRIES, "japan")),