diff --git a/10.03_app_demo/5_applications/cpu/cpu20hello.sh b/10.03_app_demo/5_applications/cpu/cpu20hello.sh
index 76abef6..ae6ddff 100644
--- a/10.03_app_demo/5_applications/cpu/cpu20hello.sh
+++ b/10.03_app_demo/5_applications/cpu/cpu20hello.sh
@@ -2,5 +2,5 @@
 # and executes a "Hello world" on a physical DL11 card
 # Main PDP-1120 must be HALTed
 cd ~/10.03_app_demo/5_applications/cpu
-~/10.03_app_demo/4_deploy/demo --arb 0 --verbose --cmdfile cpu20hello.cmd
+~/10.03_app_demo/4_deploy/demo --verbose --cmdfile cpu20hello.cmd
 
diff --git a/10.03_app_demo/5_applications/cpu/cpu20hellodl11.sh b/10.03_app_demo/5_applications/cpu/cpu20hellodl11.sh
index 58d251c..f39efed 100644
--- a/10.03_app_demo/5_applications/cpu/cpu20hellodl11.sh
+++ b/10.03_app_demo/5_applications/cpu/cpu20hellodl11.sh
@@ -2,5 +2,5 @@
 # and executes a "Hello world" on an emualted DL11 card
 # Main PDP-1120 must be HALTed
 cd ~/10.03_app_demo/5_applications/cpu
-~/10.03_app_demo/4_deploy/demo --arb 0 --verbose --cmdfile cpu20hellodl11.cmd
+~/10.03_app_demo/4_deploy/demo --verbose --cmdfile cpu20hellodl11.cmd