diff --git a/rpcs3/Emu/GS/GCM.h b/rpcs3/Emu/GS/GCM.h
index cff6b5a3d1..1b444ae079 100644
--- a/rpcs3/Emu/GS/GCM.h
+++ b/rpcs3/Emu/GS/GCM.h
@@ -68,6 +68,11 @@ enum
 	CELL_GCM_SMOOTH = 0x1D01,
 };
 
+enum
+{
+	CELL_GCM_SYSTEM_MODE_IOMAP_512MB = 1,
+};
+
 // GCM Texture
 enum
 {
diff --git a/rpcs3/Emu/GS/GL/GLGSRender.cpp b/rpcs3/Emu/GS/GL/GLGSRender.cpp
index a5d9e75731..8022d6864e 100644
--- a/rpcs3/Emu/GS/GL/GLGSRender.cpp
+++ b/rpcs3/Emu/GS/GL/GLGSRender.cpp
@@ -883,7 +883,7 @@ void GLGSRender::ExecCMD()
 	Enable(m_set_depth_test, GL_DEPTH_TEST);
 	Enable(m_set_alpha_test, GL_ALPHA_TEST);
 	Enable(m_set_depth_bounds_test, GL_DEPTH_BOUNDS_TEST_EXT);
-	Enable(m_set_blend, GL_BLEND);
+	Enable(m_set_blend || m_set_blend_mrt1 || m_set_blend_mrt2 || m_set_blend_mrt3, GL_BLEND);
 	Enable(m_set_logic_op, GL_LOGIC_OP);
 	Enable(m_set_cull_face, GL_CULL_FACE);
 	Enable(m_set_dither, GL_DITHER);
diff --git a/rpcs3/Emu/GS/RSXThread.cpp b/rpcs3/Emu/GS/RSXThread.cpp
index 8901fab043..d028acf755 100644
--- a/rpcs3/Emu/GS/RSXThread.cpp
+++ b/rpcs3/Emu/GS/RSXThread.cpp
@@ -547,11 +547,9 @@ void RSXThread::DoCmd(const u32 fcmd, const u32 cmd, mem32_ptr_t& args, const u3
 
 	case NV4097_SET_BLEND_ENABLE_MRT:
 	{
-		if (ARGS(0))
-			LOG_WARNING(RSX, "NV4097_SET_BLEND_ENABLE_MRT: %x", ARGS(0));
-
-		// TODO:
-		// (cmd)[1] = CELL_GCM_ENDIAN_SWAP(((mrt1) << 1) | ((mrt2) << 2) | ((mrt3) << 3));
+		m_set_blend_mrt1 = ARGS(0) & 0x02 ? true : false;
+		m_set_blend_mrt2 = ARGS(0) & 0x04 ? true : false;
+		m_set_blend_mrt3 = ARGS(0) & 0x08 ? true : false;
 	}
 	break;
 
diff --git a/rpcs3/Emu/GS/RSXThread.h b/rpcs3/Emu/GS/RSXThread.h
index 6fb367dc4f..10c8ef83bb 100644
--- a/rpcs3/Emu/GS/RSXThread.h
+++ b/rpcs3/Emu/GS/RSXThread.h
@@ -269,6 +269,9 @@ public:
 	u8 m_blend_color_g;
 	u8 m_blend_color_b;
 	u8 m_blend_color_a;
+	bool m_set_blend_mrt1;
+	bool m_set_blend_mrt2;
+	bool m_set_blend_mrt3;
 
 	// Stencil Test
 	bool m_set_stencil_test;
@@ -440,6 +443,9 @@ protected:
 		m_set_alpha_test = false;
 		m_set_depth_bounds_test = false;
 		m_set_blend = false;
+		m_set_blend_mrt1 = false;
+		m_set_blend_mrt2 = false;
+		m_set_blend_mrt3 = false;
 		m_set_logic_op = false;
 		m_set_cull_face = false;
 		m_set_dither = false;
@@ -518,6 +524,9 @@ protected:
 		m_set_front_polygon_mode = false;
 		m_set_back_polygon_mode = false;
 		m_set_blend = false;
+		m_set_blend_mrt1 = false;
+		m_set_blend_mrt2 = false;
+		m_set_blend_mrt3 = false;
 		m_set_blend_sfactor = false;
 		m_set_blend_dfactor = false;
 		m_set_blend_equation = false;
diff --git a/rpcs3/Emu/SysCalls/Modules/cellGcmSys.cpp b/rpcs3/Emu/SysCalls/Modules/cellGcmSys.cpp
index f91232d0c4..72f81606ae 100644
--- a/rpcs3/Emu/SysCalls/Modules/cellGcmSys.cpp
+++ b/rpcs3/Emu/SysCalls/Modules/cellGcmSys.cpp
@@ -16,6 +16,7 @@ extern Module *cellGcmSys = nullptr;
 
 u32 local_size = 0;
 u32 local_addr = 0;
+u32 system_mode = 0;
 
 enum
 {
@@ -311,7 +312,17 @@ int cellGcmInit(u32 context_addr, u32 cmdSize, u32 ioSize, u32 ioAddress)
 	cellGcmSys->Warning("*** local memory(addr=0x%x, size=0x%x)", local_addr, local_size);
 
 	InitOffsetTable();
-	Memory.MemoryBlocks.push_back(Memory.RSXIOMem.SetRange(0x50000000, 0x10000000/*256MB*/));//TODO: implement allocateAdressSpace in memoryBase
+	if (system_mode == CELL_GCM_SYSTEM_MODE_IOMAP_512MB)
+	{
+		cellGcmSys->Warning("cellGcmInit(): 512MB io address space used");
+		Memory.MemoryBlocks.push_back(Memory.RSXIOMem.SetRange(0x50000000, 0x20000000/*512MB*/));//TODO: implement allocateAdressSpace in memoryBase
+	}
+	else
+	{
+		cellGcmSys->Warning("cellGcmInit(): 256MB io address space used");
+		Memory.MemoryBlocks.push_back(Memory.RSXIOMem.SetRange(0x50000000, 0x10000000/*256MB*/));//TODO: implement allocateAdressSpace in memoryBase
+	}
+
 	if(cellGcmMapEaIoAddress(ioAddress, 0, ioSize) != CELL_OK)
 	{
 		Memory.MemoryBlocks.pop_back();
@@ -729,9 +740,12 @@ u64 cellGcmGetVBlankCount()
 	return Emu.GetGSManager().GetRender().m_vblank_count;
 }
 
-int cellGcmInitSystemMode()
+int cellGcmInitSystemMode(u64 mode)
 {
-	UNIMPLEMENTED_FUNC(cellGcmSys);
+	cellGcmSys->Log("cellGcmInitSystemMode(mode=0x%x)", mode);
+
+	system_mode = mode;
+
 	return CELL_OK;
 }
 
diff --git a/rpcs3/Emu/SysCalls/Modules/cellResc.cpp b/rpcs3/Emu/SysCalls/Modules/cellResc.cpp
index 5b0713d74f..66edaf3dfa 100644
--- a/rpcs3/Emu/SysCalls/Modules/cellResc.cpp
+++ b/rpcs3/Emu/SysCalls/Modules/cellResc.cpp
@@ -537,7 +537,7 @@ void SetupRsxRenderingStates(mem_ptr_t<CellGcmContextData>& cntxt)
 	r.m_set_depth_mask = true; r.m_depth_mask = 0;
 	r.m_set_alpha_test = false;
 	r.m_set_blend = false;
-	//GcmCmdTypePrefix::cellGcmSetBlendEnableMrt(con, CELL_GCM_FALSE, CELL_GCM_FALSE, CELL_GCM_FALSE);
+	r.m_set_blend_mrt1 = r.m_set_blend_mrt2 = r.m_set_blend_mrt3 = false;
 	r.m_set_logic_op = false;
 	r.m_set_cull_face = false;
 	r.m_set_depth_bounds_test = false;