diff --git a/Source/Project64-core/N64System/Mips/Dma.cpp b/Source/Project64-core/N64System/Mips/Dma.cpp
index 26d62defa..abfa03ab3 100644
--- a/Source/Project64-core/N64System/Mips/Dma.cpp
+++ b/Source/Project64-core/N64System/Mips/Dma.cpp
@@ -37,6 +37,7 @@ void CDMA::OnFirstDMA()
     case CIC_NUS_6101:  offset = +0x0318; break;
     case CIC_NUS_5167:  offset = +0x0318; break;
     case CIC_NUS_8303:  offset = +0x0318; break;
+    case CIC_NUS_DDUS:  offset = +0x0318; break;
     case CIC_UNKNOWN:
     case CIC_NUS_6102:  offset = +0x0318; break;
     case CIC_NUS_6103:  offset = +0x0318; break;
diff --git a/Source/Project64-core/N64System/N64Class.cpp b/Source/Project64-core/N64System/N64Class.cpp
index 5db5bad7b..8ba9ab41d 100644
--- a/Source/Project64-core/N64System/N64Class.cpp
+++ b/Source/Project64-core/N64System/N64Class.cpp
@@ -271,7 +271,7 @@ bool CN64System::RunFileImage(const char * FileLoc)
     WriteTrace(TraceN64System, TraceDebug, "Loading \"%s\"", FileLoc);
     if (g_Rom->LoadN64Image(FileLoc))
     {
-        if (g_Rom->CicChipID() == CIC_NUS_8303)
+        if (g_Rom->CicChipID() == CIC_NUS_8303 || g_Rom->CicChipID() == CIC_NUS_DDUS)
         {
             //64DD IPL
             if (g_DDRom == NULL)
@@ -356,7 +356,7 @@ bool CN64System::RunFileImageIPL(const char * FileLoc)
     WriteTrace(TraceN64System, TraceDebug, "Loading \"%s\"", FileLoc);
     if (g_DDRom->LoadN64ImageIPL(FileLoc))
     {
-        if (g_DDRom->CicChipID() != CIC_NUS_8303)
+        if (g_DDRom->CicChipID() != CIC_NUS_8303 && g_DDRom->CicChipID() != CIC_NUS_DDUS)
         {
             //If not 64DD IPL then it's wrong
             WriteTrace(TraceN64System, TraceError, "LoadN64ImageIPL failed (\"%s\")", FileLoc);
@@ -885,6 +885,9 @@ void CN64System::InitRegisters(bool bPostPif, CMipsMemoryVM & MMU)
         case CIC_NUS_5167:        //64DD CONVERSION CIC
             m_Reg.m_GPR[22].DW = 0x00000000000000DD;
             break;
+        case CIC_NUS_DDUS:        //64DD US IPL CIC
+            m_Reg.m_GPR[22].DW = 0x00000000000000DE;
+            break;
         case CIC_UNKNOWN:
         case CIC_NUS_6102:
             m_Reg.m_GPR[1].DW = 0x0000000000000001;
diff --git a/Source/Project64-core/N64System/N64RomClass.cpp b/Source/Project64-core/N64System/N64RomClass.cpp
index 7f6097829..2ba038ad6 100644
--- a/Source/Project64-core/N64System/N64RomClass.cpp
+++ b/Source/Project64-core/N64System/N64RomClass.cpp
@@ -288,6 +288,8 @@ CICChip CN64Rom::GetCicChipID(uint8_t * RomData, uint64_t * CRC)
     case 0x000000D6D5BE5580: return CIC_NUS_6106;
     case 0x000001053BC19870: return CIC_NUS_5167; //64DD CONVERSION CIC
     case 0x000000D2E53EF008: return CIC_NUS_8303; //64DD IPL
+    case 0x000000D2E53EF39F: return CIC_NUS_8303; //64DD IPL TOOL
+    case 0x000000D2E53E5DDA: return CIC_NUS_DDUS; //64DD IPL US (different CIC)
     default:
         return CIC_UNKNOWN;
     }
diff --git a/Source/Project64-core/N64System/N64Types.h b/Source/Project64-core/N64System/N64Types.h
index 0d4043f97..ed64221c7 100644
--- a/Source/Project64-core/N64System/N64Types.h
+++ b/Source/Project64-core/N64System/N64Types.h
@@ -65,7 +65,7 @@ enum CICChip
 {
     CIC_UNKNOWN = -1, CIC_NUS_6101 = 1, CIC_NUS_6102 = 2, CIC_NUS_6103 = 3,
     CIC_NUS_6104 = 4, CIC_NUS_6105 = 5, CIC_NUS_6106 = 6, CIC_NUS_5167 = 7,
-    CIC_NUS_8303 = 8
+    CIC_NUS_8303 = 8, CIC_NUS_DDUS = 9
 };
 
 enum Country
diff --git a/Source/Project64/UserInterface/RomBrowserClass.cpp b/Source/Project64/UserInterface/RomBrowserClass.cpp
index feb1cb310..0cd5a496f 100644
--- a/Source/Project64/UserInterface/RomBrowserClass.cpp
+++ b/Source/Project64/UserInterface/RomBrowserClass.cpp
@@ -735,6 +735,10 @@ void CRomBrowser::RomList_GetDispInfo(uint32_t pnmh)
         {
             swprintf(lpdi->item.pszText, lpdi->item.cchTextMax / sizeof(wchar_t), L"CIC-NUS-5167", pRomInfo->CicChip);
         }
+        else if (pRomInfo->CicChip == CIC_NUS_DDUS)
+        {
+            swprintf(lpdi->item.pszText, lpdi->item.cchTextMax / sizeof(wchar_t), L"CIC-NUS-????", pRomInfo->CicChip);
+        }
         else
         {
             swprintf(lpdi->item.pszText, lpdi->item.cchTextMax / sizeof(wchar_t), L"CIC-NUS-610%d", pRomInfo->CicChip);
diff --git a/Source/Project64/UserInterface/RomInformationClass.cpp b/Source/Project64/UserInterface/RomInformationClass.cpp
index abb4c2c30..7bddc61f6 100644
--- a/Source/Project64/UserInterface/RomInformationClass.cpp
+++ b/Source/Project64/UserInterface/RomInformationClass.cpp
@@ -117,6 +117,7 @@ DWORD CALLBACK RomInfoProc(HWND hDlg, DWORD uMsg, DWORD wParam, DWORD lParam)
         case CIC_UNKNOWN: CicChip = L"Unknown"; break;
         case CIC_NUS_8303: CicChip = L"CIC-NUS-8303"; break;
         case CIC_NUS_5167: CicChip = L"CIC-NUS-5167"; break;
+        case CIC_NUS_DDUS: CicChip = L"CIC-NUS-????"; break;
         default: CicChip = stdstr_f("CIC-NUS-610%d", _this->m_pRomInfo->CicChipID()).ToUTF16(); break;
         }
         SetDlgItemTextW(hDlg, IDC_INFO_CIC, CicChip.c_str());