diff --git a/VAX/vax_syslist.c b/VAX/vax_syslist.c
index 054c5e43..1e278ca6 100644
--- a/VAX/vax_syslist.c
+++ b/VAX/vax_syslist.c
@@ -51,6 +51,8 @@ extern DEVICE dz_dev;
 extern DEVICE csi_dev, cso_dev;
 extern DEVICE xq_dev, xqb_dev;
 extern DEVICE vh_dev;
+extern DEVICE dmc_dev[];
+extern DEVICE dmp_dev[];
 
 extern int32 sim_switches;
 extern void WriteB (uint32 pa, int32 val);
@@ -83,6 +85,11 @@ DEVICE *sim_devices[] = {
     &tq_dev,
     &xq_dev,
     &xqb_dev,
+	&dmc_dev[0],
+	&dmc_dev[1],
+	&dmc_dev[2],
+	&dmc_dev[3],
+	&dmp_dev[0],
     NULL
     };
 
diff --git a/VAX/vaxmod_defs.h b/VAX/vaxmod_defs.h
index 2f235481..5b0cf736 100644
--- a/VAX/vaxmod_defs.h
+++ b/VAX/vaxmod_defs.h
@@ -318,6 +318,8 @@ typedef struct {
 #define IOLN_PTR        004
 #define IOBA_PTP        (IOPAGEBASE + 017554)           /* PC11 punch */
 #define IOLN_PTP        004
+#define IOBA_DMC        (IOPAGEBASE + 017060)           /* DMC11 */
+#define IOLN_DMC        010
 
 /* The KA65x maintains 4 separate hardware IPL levels, IPL 17 to IPL 14;
    however, DEC Qbus controllers all interrupt on IPL 14
@@ -356,6 +358,8 @@ typedef struct {
 #define INT_V_VHTX      18 
 #define INT_V_QDSS      19                              /* QDSS */
 #define INT_V_CR        20
+#define INT_V_DMCRX     21                              /* DMC11 */
+#define INT_V_DMCTX     22
 
 #define INT_CLK         (1u << INT_V_CLK)
 #define INT_RQ          (1u << INT_V_RQ)
@@ -379,6 +383,8 @@ typedef struct {
 #define INT_VHTX        (1u << INT_V_VHTX)
 #define INT_QDSS        (1u << INT_V_QDSS)
 #define INT_CR          (1u << INT_V_CR)
+#define INT_DMCRX       (1u << INT_V_DMCRX)
+#define INT_DMCTX       (1u << INT_V_DMCTX)
 
 #define IPL_CLK         (0x16 - IPL_HMIN)                       /* relative IPL */
 #define IPL_RQ          (0x14 - IPL_HMIN)
@@ -402,6 +408,8 @@ typedef struct {
 #define IPL_VHTX        (0x14 - IPL_HMIN)
 #define IPL_QDSS        (0x14 - IPL_HMIN)
 #define IPL_CR          (0x14 - IPL_HMIN)
+#define IPL_DMCRX       (0x14 - IPL_HMIN)
+#define IPL_DMCTX       (0x14 - IPL_HMIN)
 
 #define IPL_HMAX        0x17                            /* highest hwre level */
 #define IPL_HMIN        0x14                            /* lowest hwre level */
@@ -428,6 +436,8 @@ typedef struct {
 #define VEC_DZTX        (VEC_Q + 0304)
 #define VEC_VHRX        (VEC_Q + 0310)   
 #define VEC_VHTX        (VEC_Q + 0314)
+#define VEC_DMCRX       (VEC_Q + 0310)
+#define VEC_DMCTX       (VEC_Q + 0314)
 
 /* Interrupt macros */
 
diff --git a/Visual Studio Projects/VAX.vcproj b/Visual Studio Projects/VAX.vcproj
index 71ea3fd3..acd574fa 100644
--- a/Visual Studio Projects/VAX.vcproj	
+++ b/Visual Studio Projects/VAX.vcproj	
@@ -207,6 +207,10 @@
 				RelativePath="..\PDP11\pdp11_cr.c"
 				>
 			</File>
+			<File
+				RelativePath="..\PDP11\pdp11_dmc.c"
+				>
+			</File>
 			<File
 				RelativePath="..\PDP11\pdp11_dz.c"
 				>
@@ -365,6 +369,10 @@
 			Name="Header Files"
 			Filter="h;hpp;hxx;hm;inl;inc"
 			>
+			<File
+				RelativePath="..\PDP11\pdp11_dmc.h"
+				>
+			</File>
 			<File
 				RelativePath="..\PDP11\pdp11_io_lib.h"
 				>
diff --git a/descrip.mms b/descrip.mms
index 5063d27e..ca932e0b 100644
--- a/descrip.mms
+++ b/descrip.mms
@@ -616,7 +616,8 @@ VAX_SOURCE2 = $(PDP11_DIR)PDP11_IO_LIB.C,\
               $(PDP11_DIR)PDP11_TS.C,$(PDP11_DIR)PDP11_DZ.C,\
               $(PDP11_DIR)PDP11_LP.C,$(PDP11_DIR)PDP11_TQ.C,\
               $(PDP11_DIR)PDP11_XQ.C,$(PDP11_DIR)PDP11_CR.C,\
-              $(PDP11_DIR)PDP11_RY.C,$(PDP11_DIR)PDP11_VH.C
+              $(PDP11_DIR)PDP11_RY.C,$(PDP11_DIR)PDP11_VH.C,\
+              $(PDP11_DIR)PDP11_DMC.C
 .IFDEF ALPHA_OR_IA64
 VAX_OPTIONS = /INCL=($(SIMH_DIR),$(VAX_DIR),$(PDP11_DIR)$(PCAP_INC))\
                 /DEF=($(CC_DEFS),"VM_VAX=1","USE_ADDR64=1","USE_INT64=1"$(PCAP_DEFS))
@@ -646,7 +647,8 @@ VAX780_SOURCE2 = $(PDP11_DIR)PDP11_RL.C,$(PDP11_DIR)PDP11_RQ.C,\
                  $(PDP11_DIR)PDP11_XU.C,$(PDP11_DIR)PDP11_RY.C,\
                  $(PDP11_DIR)PDP11_CR.C,$(PDP11_DIR)PDP11_RP.C,\
                  $(PDP11_DIR)PDP11_TU.C,$(PDP11_DIR)PDP11_HK.C,\
-                 $(PDP11_DIR)PDP11_VH.C,$(PDP11_DIR)PDP11_IO_LIB.C
+                 $(PDP11_DIR)PDP11_VH.C,$(PDP11_DIR)PDP11_DMC.C,\
+                 $(PDP11_DIR)PDP11_IO_LIB.C
 .IFDEF ALPHA_OR_IA64
 VAX780_OPTIONS = /INCL=($(SIMH_DIR),$(VAX780_DIR),$(PDP11_DIR)$(PCAP_INC))\
                  /DEF=($(CC_DEFS),"VM_VAX=1","USE_ADDR64=1","USE_INT64=1"$(PCAP_DEFS),"VAX_780=1")