diff --git a/PDP10/pdp10_defs.h b/PDP10/pdp10_defs.h
index e2014a76..907f5cba 100644
--- a/PDP10/pdp10_defs.h
+++ b/PDP10/pdp10_defs.h
@@ -699,6 +699,7 @@ typedef struct pdp_dib DIB;
 #define INT_V_KMCB      9
 #define INT_V_DMCRX     10                              /* DMC11/DMR11 */
 #define INT_V_DMCTX     11
+#define INT_V_XU        15                              /* DEUNA/DELUA */
 #define INT_V_DZRX      16                              /* DZ11 */
 #define INT_V_DZTX      17
 #define INT_V_RY        18                              /* RX211 */
diff --git a/PDP10/pdp10_ksio.c b/PDP10/pdp10_ksio.c
index df865df9..2c1d51cf 100644
--- a/PDP10/pdp10_ksio.c
+++ b/PDP10/pdp10_ksio.c
@@ -1997,6 +1997,8 @@ AUTO_CON auto_tab[] = {/*c  #v  am vm  fxa   fxv */
         {0017550}, {0070} },                             /* PC11 reader - fx CSR, fx VEC */
     { { "PTP" },         1,  1,  0, 0, 
         {0017554}, {0074} },                             /* PC11 punch - fx CSR, fx VEC */
+    { { "XU", "XUB" },   1,  1,  8, 4, 
+        {014510}, {0120} },                              /* DEUNA */
     { { "DUP" },         1,  2,  0, 0, 
         {0000300}, {0570} },                             /* DUP11 bit sync - fx CSR, fx VEC */
     { { "KDP" },         1,  2,  0, 0, 
diff --git a/PDP10/pdp10_sys.c b/PDP10/pdp10_sys.c
index 895e4e68..acdc47a0 100644
--- a/PDP10/pdp10_sys.c
+++ b/PDP10/pdp10_sys.c
@@ -55,6 +55,7 @@ extern DEVICE dz_dev;
 extern DEVICE ry_dev;
 extern DEVICE cr_dev;
 extern DEVICE lp20_dev;
+extern DEVICE xu_dev;
 extern DEVICE dup_dev;
 extern DEVICE kmc_dev;
 extern DEVICE dmc_dev;
@@ -93,6 +94,7 @@ DEVICE *sim_devices[] = {
     &rp_dev,
     &tu_dev,
     &dz_dev,
+    &xu_dev,
     &dup_dev,
     &kmc_dev,
     &dmc_dev,
diff --git a/Visual Studio Projects/PDP10.vcproj b/Visual Studio Projects/PDP10.vcproj
index 40a10e26..74bbc717 100644
--- a/Visual Studio Projects/PDP10.vcproj	
+++ b/Visual Studio Projects/PDP10.vcproj	
@@ -35,6 +35,9 @@
 			<Tool
 				Name="VCXMLDataGeneratorTool"
 			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
 			<Tool
 				Name="VCMIDLTool"
 			/>
@@ -116,6 +119,9 @@
 			<Tool
 				Name="VCXMLDataGeneratorTool"
 			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
 			<Tool
 				Name="VCMIDLTool"
 			/>
@@ -150,10 +156,10 @@
 				AdditionalLibraryDirectories="../../windows-build/PCRE/lib/"
 				GenerateDebugInformation="false"
 				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
 				StackReserveSize="10485760"
 				StackCommitSize="10485760"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
 				RandomizedBaseAddress="1"
 				DataExecutionPrevention="0"
 				TargetMachine="1"
@@ -260,6 +266,10 @@
 				RelativePath="..\PDP11\pdp11_ry.c"
 				>
 			</File>
+			<File
+				RelativePath="..\PDP11\pdp11_xu.c"
+				>
+			</File>
 			<File
 				RelativePath="..\scp.c"
 				>
@@ -313,6 +323,10 @@
 				RelativePath="..\PDP11\pdp11_ddcmp.h"
 				>
 			</File>
+			<File
+				RelativePath="..\PDP11\pdp11_xu.h"
+				>
+			</File>
 			<File
 				RelativePath="..\scp.h"
 				>
diff --git a/descrip.mms b/descrip.mms
index 6bcb1127..d5b9d972 100644
--- a/descrip.mms
+++ b/descrip.mms
@@ -573,7 +573,7 @@ PDP10_SOURCE = $(PDP10_DIR)PDP10_FE.C,\
                $(PDP11_DIR)PDP11_PT.C,$(PDP11_DIR)PDP11_DZ.C,\
                $(PDP11_DIR)PDP11_RY.C,$(PDP11_DIR)PDP11_CR.C,\
                $(PDP11_DIR)PDP11_DUP.C,$(PDP11_DIR)PDP11_DMC.C,\
-               $(PDP11_DIR)PDP11_KMC.C
+               $(PDP11_DIR)PDP11_KMC.C,$(PDP11_DIR)PDP11_XU.C
 PDP10_OPTIONS = /INCL=($(SIMH_DIR),$(PDP10_DIR),$(PDP11_DIR))\
                 /DEF=($(CC_DEFS),"USE_INT64=1","VM_PDP10=1"$(PCAP_DEFS))
 
diff --git a/makefile b/makefile
index 1acdcb0f..57f5efef 100644
--- a/makefile
+++ b/makefile
@@ -1048,7 +1048,8 @@ PDP10 = ${PDP10D}/pdp10_fe.c ${PDP11D}/pdp11_dz.c ${PDP10D}/pdp10_cpu.c \
 	${PDP10D}/pdp10_pag.c ${PDP10D}/pdp10_rp.c ${PDP10D}/pdp10_sys.c \
 	${PDP10D}/pdp10_tim.c ${PDP10D}/pdp10_tu.c ${PDP10D}/pdp10_xtnd.c \
 	${PDP11D}/pdp11_pt.c ${PDP11D}/pdp11_ry.c ${PDP11D}/pdp11_cr.c \
-	${PDP11D}/pdp11_dup.c ${PDP11D}/pdp11_dmc.c ${PDP11D}/pdp11_kmc.c 
+	${PDP11D}/pdp11_dup.c ${PDP11D}/pdp11_dmc.c ${PDP11D}/pdp11_kmc.c \
+	${PDP11D}/pdp11_xu.c
 PDP10_OPT = -DVM_PDP10 -DUSE_INT64 -I ${PDP10D} -I ${PDP11D}