diff --git a/build/pdp10-kl/boot b/build/pdp10-kl/boot
index d863a8de..f60d3e64 100644
--- a/build/pdp10-kl/boot
+++ b/build/pdp10-kl/boot
@@ -9,7 +9,7 @@ set fha dis
 set dpb dis
 set lpt dis
 set cr dis
-set dc dis
+set dc disable
 set dtc dis
 set dk dis
 set pd off
diff --git a/build/pdp10-kl/boot2 b/build/pdp10-kl/boot2
index a595f531..71c94e71 100644
--- a/build/pdp10-kl/boot2
+++ b/build/pdp10-kl/boot2
@@ -9,7 +9,7 @@ set fha dis
 set dpb dis
 set lpt dis
 set cr dis
-set dc dis
+set dc disable
 set dtc dis
 set dk dis
 set pd ena
diff --git a/build/pdp10-kl/init b/build/pdp10-kl/init
index 3103937c..6d1c9273 100644
--- a/build/pdp10-kl/init
+++ b/build/pdp10-kl/init
@@ -9,7 +9,7 @@ set fha dis
 set dpb dis
 set lpt dis
 set cr dis
-set dc dis
+set dc disable
 set dtc dis
 set dk dis
 at mta0 out/pdp10-kl/kl-magdmp.tap
diff --git a/build/pdp10-kl/run b/build/pdp10-kl/run
index 56e57d4a..17de8691 100644
--- a/build/pdp10-kl/run
+++ b/build/pdp10-kl/run
@@ -10,7 +10,7 @@ set fha dis
 set dpb dis
 set lpt dis
 set cr dis
-set dc dis
+set dc disable
 set dtc dis
 set dk dis
 set pd ena