diff --git a/emulators/swanstation.yml b/emulators/swanstation.yml
index bbc5aaa5..583b3fc4 100644
--- a/emulators/swanstation.yml
+++ b/emulators/swanstation.yml
@@ -70,11 +70,12 @@ files:
     aliases: []
 
   - name: "ps1_rom.bin"
-    description: "PS3 (v5.0 06-23-03 A)"
+    description: "PS3 embedded PS1 BIOS (v5.0 06-23-03 A)"
     region: "Auto"
     required: false
     md5: "81bbe60ba7a3d1cea1d48c14cbcc647b"
-    size: 4089584
+    size: [524288, 4194304, 4089584]
     validation: [size, md5]
-    source_ref: "src/core/bios.cpp:70"
+    note: "Accepts PS1 (512KB), PS2 (4MB), and PS3 (0x3E66F0) sizes. Only first 512KB used."
+    source_ref: "src/core/bios.h:9, src/core/bios.cpp:70,83"
     aliases: []
diff --git a/scripts/generate_site.py b/scripts/generate_site.py
index f555a4a4..01721ee5 100644
--- a/scripts/generate_site.py
+++ b/scripts/generate_site.py
@@ -1176,7 +1176,10 @@ def generate_emulator_page(
             if fsystem:
                 details.append(f"System: {_system_link(fsystem, '../')}")
             if size:
-                size_str = _fmt_size(size)
+                if isinstance(size, list):
+                    size_str = " / ".join(_fmt_size(s) for s in size)
+                else:
+                    size_str = _fmt_size(size)
                 if fmin or fmax:
                     bounds = []
                     if fmin:
diff --git a/scripts/validation.py b/scripts/validation.py
index 150dc8b8..5e75a4db 100644
--- a/scripts/validation.py
+++ b/scripts/validation.py
@@ -102,8 +102,12 @@ def _build_validation_index(profiles: dict) -> dict[str, dict]:
             index[fname]["crypto_only"].update(c for c in checks if c in _CRYPTO_CHECKS)
             # Size checks
             if "size" in checks:
-                if f.get("size") is not None:
-                    index[fname]["sizes"].add(f["size"])
+                raw_size = f.get("size")
+                if raw_size is not None:
+                    if isinstance(raw_size, list):
+                        index[fname]["sizes"].update(raw_size)
+                    else:
+                        index[fname]["sizes"].add(raw_size)
                 if f.get("min_size") is not None:
                     cur = index[fname]["min_size"]
                     index[fname]["min_size"] = (