diff --git a/PDP10/ks10_rp.c b/PDP10/ks10_rp.c
index 75b40e1..281e095 100644
--- a/PDP10/ks10_rp.c
+++ b/PDP10/ks10_rp.c
@@ -673,7 +673,6 @@ rp_read(t_addr addr, uint16 *data, int32 access) {
 uint16
 rp_vect(struct pdp_dib *dibp)
 {
-    rp_ie &= ~CS1_IE;
     return dibp->uba_vect;
 }
 
diff --git a/PDP10/ks10_tu.c b/PDP10/ks10_tu.c
index 1dc948e..967657e 100644
--- a/PDP10/ks10_tu.c
+++ b/PDP10/ks10_tu.c
@@ -546,7 +546,6 @@ tu_read(t_addr addr, uint16 *data, int32 access)
 uint16
 tu_vect(struct pdp_dib *dibp)
 {
-    tu_ie &= ~CS1_IE;
     return dibp->uba_vect;
 }
 
diff --git a/PDP10/ks10_uba.c b/PDP10/ks10_uba.c
index ee41003..3841e15 100644
--- a/PDP10/ks10_uba.c
+++ b/PDP10/ks10_uba.c
@@ -59,6 +59,7 @@ uba_read(t_addr addr, int ctl, uint64 *data, int access)
 
     if (ubm == -1) {
         uba_status[ubm] |= UBST_TIM | UBST_NED;
+        sim_debug(DEBUG_EXP, &cpu_dev, "No UBA adaptor %02o %08o\n", ctl, addr);
         return 1;
     }
 
@@ -104,7 +105,7 @@ uba_read(t_addr addr, int ctl, uint64 *data, int access)
             return r;
         }
     }
-    sim_debug(DEBUG_EXP, &cpu_dev, "No UBA device %08o\n", addr);
+    sim_debug(DEBUG_EXP, &cpu_dev, "No UBA device  %02o %08o\n", ctl, addr);
     uba_status[ubm] |= UBST_TIM | UBST_NED;
     return 1;
 }
@@ -118,6 +119,7 @@ uba_write(t_addr addr, int ctl, uint64 data, int access)
 
     if (ubm == -1) {
         uba_status[ubm] |= UBST_TIM | UBST_NED;
+        sim_debug(DEBUG_EXP, &cpu_dev, "No UBA adaptor %02o %08o %012llo\n", ctl, addr, data);
         return 1;
     }
 
@@ -169,7 +171,7 @@ uba_write(t_addr addr, int ctl, uint64 data, int access)
             return dibp->wr_io(addr, buf, access);
         }
     }
-    sim_debug(DEBUG_EXP, &cpu_dev, "No UBA device write %08o %012llo\n", addr, data);
+    sim_debug(DEBUG_EXP, &cpu_dev, "No UBA device write %02o %08o %012llo\n", ctl, addr, data);
     uba_status[ubm] |= UBST_TIM | UBST_NED;
     return 1;
 }