diff --git a/build/pdp10-ka/start b/build/pdp10-ka/start
index 1760196e..7ff8e023 100755
--- a/build/pdp10-ka/start
+++ b/build/pdp10-ka/start
@@ -25,7 +25,7 @@ gt40() {
 }
 
 tv11() {
-    (sleep 3; tools/tv11/tv11 -p 10011 localhost >tv11.log 2>&1) &
+    (sleep 3; tools/tv11/tv11 -s 4 -p 10011 localhost >tv11.log 2>&1) &
     started TV-11 "$!"
 }
 
diff --git a/tools/tv11 b/tools/tv11
index 3b1e2a3b..c04b33dc 160000
--- a/tools/tv11
+++ b/tools/tv11
@@ -1 +1 @@
-Subproject commit 3b1e2a3bf09a170b3ea0deab219fc3f9b9209ad0
+Subproject commit c04b33dc6da57ddd336b5d082b7ebfd5963bc21d