diff --git a/PDP10/pdp10_sys.c b/PDP10/pdp10_sys.c
index 4bfa6240..24ec2d48 100644
--- a/PDP10/pdp10_sys.c
+++ b/PDP10/pdp10_sys.c
@@ -55,7 +55,6 @@ extern DEVICE dz_dev;
 extern DEVICE ry_dev;
 extern DEVICE cr_dev;
 extern DEVICE lp20_dev;
-extern DEVICE dmc_dev[];
 extern UNIT cpu_unit;
 extern REG cpu_reg[];
 extern d10 *M;
@@ -91,10 +90,6 @@ DEVICE *sim_devices[] = {
     &rp_dev,
     &tu_dev,
     &dz_dev,
-    &dmc_dev[0],
-    &dmc_dev[1],
-    &dmc_dev[2],
-    &dmc_dev[3],
     NULL
     };
 
diff --git a/Visual Studio Projects/PDP10.vcproj b/Visual Studio Projects/PDP10.vcproj
index e39d4694..d224e9e0 100644
--- a/Visual Studio Projects/PDP10.vcproj	
+++ b/Visual Studio Projects/PDP10.vcproj	
@@ -239,10 +239,6 @@
 				RelativePath="..\PDP11\pdp11_cr.c"
 				>
 			</File>
-			<File
-				RelativePath="..\PDP11\pdp11_dmc.c"
-				>
-			</File>
 			<File
 				RelativePath="..\PDP11\pdp11_dz.c"
 				>
@@ -304,10 +300,6 @@
 				RelativePath="..\PDP10\pdp10_defs.h"
 				>
 			</File>
-			<File
-				RelativePath="..\PDP11\pdp11_dmc.h"
-				>
-			</File>
 			<File
 				RelativePath="..\scp.h"
 				>
diff --git a/makefile b/makefile
index 7a15430e..e07702f3 100644
--- a/makefile
+++ b/makefile
@@ -597,8 +597,7 @@ PDP10 = ${PDP10D}/pdp10_fe.c ${PDP11D}/pdp11_dz.c ${PDP10D}/pdp10_cpu.c \
 	${PDP10D}/pdp10_ksio.c ${PDP10D}/pdp10_lp20.c ${PDP10D}/pdp10_mdfp.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_dmc.c \
-	${PDP11D}/pdp11_cr.c
+	${PDP11D}/pdp11_pt.c ${PDP11D}/pdp11_ry.c ${PDP11D}/pdp11_cr.c
 PDP10_OPT = -DVM_PDP10 -DUSE_INT64 -I ${PDP10D} -I ${PDP11D}