diff --git a/bios/Real3D/Pro-1000/Assets/.variants/3dlogo.cmem.35f079de b/bios/Real3D/Pro-1000/Assets/.variants/3dlogo.cmem.35f079de
new file mode 100644
index 00000000..8ce3a62d
Binary files /dev/null and b/bios/Real3D/Pro-1000/Assets/.variants/3dlogo.cmem.35f079de differ
diff --git a/bios/Real3D/Pro-1000/Assets/.variants/3dlogo.pmem.928e7fdb b/bios/Real3D/Pro-1000/Assets/.variants/3dlogo.pmem.928e7fdb
new file mode 100644
index 00000000..0240c385
Binary files /dev/null and b/bios/Real3D/Pro-1000/Assets/.variants/3dlogo.pmem.928e7fdb differ
diff --git a/bios/Real3D/Pro-1000/Assets/3dlogo.cmem b/bios/Real3D/Pro-1000/Assets/3dlogo.cmem
new file mode 100644
index 00000000..2b8114cd
Binary files /dev/null and b/bios/Real3D/Pro-1000/Assets/3dlogo.cmem differ
diff --git a/bios/Real3D/Pro-1000/Assets/3dlogo.pmem b/bios/Real3D/Pro-1000/Assets/3dlogo.pmem
new file mode 100644
index 00000000..9325b929
Binary files /dev/null and b/bios/Real3D/Pro-1000/Assets/3dlogo.pmem differ
diff --git a/emulators/supermodel3.yml b/emulators/supermodel3.yml
index 01ef6811..e179e9a3 100644
--- a/emulators/supermodel3.yml
+++ b/emulators/supermodel3.yml
@@ -130,12 +130,12 @@ files:
     required: false
     system: real3d-pro1000
     description: "Pro-1000 SDK logo model, culling data"
-    note: "Read with 3dlogo.pmem into the synthetic SCSI ROM when the set has no scsi_rom region. Both files or neither, one alone is rejected with an error. The machine boots without them."
-    source_ref: "source Src/Pro1000/SyntheticSCSIROM.cpp:102-125, source Src/Pro1000/SyntheticSCSIROM.cpp:232"
+    note: "Read with 3dlogo.pmem into the synthetic SCSI ROM when the set has no scsi_rom region. Both files or neither, one alone is rejected with an error. The .pmem size must equal the polygon word count in the .cmem header, so both come from one model. The machine boots without them."
+    source_ref: "source Src/Pro1000/SyntheticSCSIROM.cpp:102-125, source Src/Pro1000/SyntheticSCSIROM.cpp:159-163, source Src/Pro1000/SyntheticSCSIROM.cpp:232"
 
   - name: "3dlogo.pmem"
     path: "Assets/3dlogo.pmem"
     required: false
     system: real3d-pro1000
     description: "Pro-1000 SDK logo model, polygon data"
-    source_ref: "source Src/Pro1000/SyntheticSCSIROM.cpp:104-106, source Src/Pro1000/SyntheticSCSIROM.cpp:119-125"
+    source_ref: "source Src/Pro1000/SyntheticSCSIROM.cpp:104-106, source Src/Pro1000/SyntheticSCSIROM.cpp:119-125, source Src/Pro1000/SyntheticSCSIROM.cpp:159-163"