diff --git a/VAX/vax_syslist.c b/VAX/vax_syslist.c
index df1f9d38..c367f29e 100644
--- a/VAX/vax_syslist.c
+++ b/VAX/vax_syslist.c
@@ -51,7 +51,6 @@ 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 void WriteB (uint32 pa, int32 val);
 extern void rom_wr_B (int32 pa, int32 val);
@@ -83,10 +82,6 @@ DEVICE *sim_devices[] = {
     &tq_dev,
     &xq_dev,
     &xqb_dev,
-	&dmc_dev[0],
-	&dmc_dev[1],
-	&dmc_dev[2],
-	&dmc_dev[3],
     NULL
     };
 
diff --git a/Visual Studio Projects/VAX.vcproj b/Visual Studio Projects/VAX.vcproj
index 9d0626f6..e36825d6 100644
--- a/Visual Studio Projects/VAX.vcproj	
+++ b/Visual Studio Projects/VAX.vcproj	
@@ -207,10 +207,6 @@
 				RelativePath="..\PDP11\pdp11_cr.c"
 				>
 			</File>
-			<File
-				RelativePath="..\PDP11\pdp11_dmc.c"
-				>
-			</File>
 			<File
 				RelativePath="..\PDP11\pdp11_dz.c"
 				>
@@ -369,10 +365,6 @@
 			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/Visual Studio Projects/VAX620.vcproj b/Visual Studio Projects/VAX620.vcproj
index d78d0be2..3ec0ae1d 100644
--- a/Visual Studio Projects/VAX620.vcproj	
+++ b/Visual Studio Projects/VAX620.vcproj	
@@ -207,10 +207,6 @@
 				RelativePath="..\PDP11\pdp11_cr.c"
 				>
 			</File>
-			<File
-				RelativePath="..\PDP11\pdp11_dmc.c"
-				>
-			</File>
 			<File
 				RelativePath="..\PDP11\pdp11_dz.c"
 				>
@@ -373,10 +369,6 @@
 			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/Visual Studio Projects/VAX630.vcproj b/Visual Studio Projects/VAX630.vcproj
index a8b345b3..abe827ad 100644
--- a/Visual Studio Projects/VAX630.vcproj	
+++ b/Visual Studio Projects/VAX630.vcproj	
@@ -207,10 +207,6 @@
 				RelativePath="..\PDP11\pdp11_cr.c"
 				>
 			</File>
-			<File
-				RelativePath="..\PDP11\pdp11_dmc.c"
-				>
-			</File>
 			<File
 				RelativePath="..\PDP11\pdp11_dz.c"
 				>
@@ -373,10 +369,6 @@
 			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 6931bd9a..44440c9f 100644
--- a/descrip.mms
+++ b/descrip.mms
@@ -559,8 +559,7 @@ PDP10_SOURCE = $(PDP10_DIR)PDP10_FE.C,\
                $(PDP10_DIR)PDP10_RP.C,$(PDP10_DIR)PDP10_SYS.C,\
                $(PDP10_DIR)PDP10_TIM.C,$(PDP10_DIR)PDP10_TU.C,\
                $(PDP11_DIR)PDP11_PT.C,$(PDP11_DIR)PDP11_DZ.C,\
-               $(PDP11_DIR)PDP11_RY.C,$(PDP11_DIR)PDP11_CR.C,\
-               $(PDP11_DIR)PDP11_DMC.C
+               $(PDP11_DIR)PDP11_RY.C,$(PDP11_DIR)PDP11_CR.C
 PDP10_OPTIONS = /INCL=($(SIMH_DIR),$(PDP10_DIR),$(PDP11_DIR))\
                 /DEF=($(CC_DEFS),"USE_INT64=1","VM_PDP10=1"$(PCAP_DEFS))
 
@@ -626,8 +625,7 @@ 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_DMC.C
+              $(PDP11_DIR)PDP11_RY.C,$(PDP11_DIR)PDP11_VH.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))
diff --git a/makefile b/makefile
index 2a3fa0b6..80d41010 100644
--- a/makefile
+++ b/makefile
@@ -512,7 +512,7 @@ VAX = ${VAXD}/vax_cpu.c ${VAXD}/vax_cpu1.c ${VAXD}/vax_fpa.c ${VAXD}/vax_io.c \
 	${PDP11D}/pdp11_rl.c ${PDP11D}/pdp11_rq.c ${PDP11D}/pdp11_ts.c \
 	${PDP11D}/pdp11_dz.c ${PDP11D}/pdp11_lp.c ${PDP11D}/pdp11_tq.c \
 	${PDP11D}/pdp11_xq.c ${PDP11D}/pdp11_ry.c ${PDP11D}/pdp11_vh.c \
-	${PDP11D}/pdp11_cr.c ${PDP11D}/pdp11_dmc.c ${PDP11D}/pdp11_io_lib.c
+	${PDP11D}/pdp11_cr.c ${PDP11D}/pdp11_io_lib.c
 VAX_OPT = -DVM_VAX -DUSE_INT64 -DUSE_ADDR64 -I ${VAXD} -I ${PDP11D} ${NETWORK_OPT}
 
 
@@ -535,7 +535,7 @@ VAX630 = ${VAXD}/vax_cpu.c ${VAXD}/vax_cpu1.c ${VAXD}/vax_fpa.c \
 	${PDP11D}/pdp11_rl.c ${PDP11D}/pdp11_rq.c ${PDP11D}/pdp11_ts.c \
 	${PDP11D}/pdp11_dz.c ${PDP11D}/pdp11_lp.c ${PDP11D}/pdp11_tq.c \
 	${PDP11D}/pdp11_xq.c ${PDP11D}/pdp11_ry.c ${PDP11D}/pdp11_vh.c \
-	${PDP11D}/pdp11_cr.c ${PDP11D}/pdp11_dmc.c ${PDP11D}/pdp11_io_lib.c
+	${PDP11D}/pdp11_cr.c ${PDP11D}/pdp11_io_lib.c
 VAX620_OPT = -DVM_VAX -DVAX_620 -DUSE_INT64 -DUSE_ADDR64 -I ${VAXD} -I ${PDP11D} ${NETWORK_OPT}
 VAX630_OPT = -DVM_VAX -DVAX_630 -DUSE_INT64 -DUSE_ADDR64 -I ${VAXD} -I ${PDP11D} ${NETWORK_OPT}