diff --git a/PDP11/pdp11_dz.c b/PDP11/pdp11_dz.c
index 17b12485..a6c29c30 100644
--- a/PDP11/pdp11_dz.c
+++ b/PDP11/pdp11_dz.c
@@ -785,6 +785,8 @@ sim_debug(DBG_TRC, dptr, "dz_reset()\n");
 if (dz_ldsc == NULL) {
     dz_desc.lines = DZ_MUXES * DZ_LINES;
     dz_desc.ldsc = dz_ldsc = (TMLN *)calloc (dz_desc.lines, sizeof(*dz_ldsc));
+    sim_set_uname (&dz_unit[0], "DZ-RCV-CON");
+    sim_set_uname (&dz_unit[1], "DZ-XMT");
     }
 if ((dz_desc.lines % DZ_LINES) != 0) {      /* Transition from Qbus to Unibus device */
     int32 newln = DZ_LINES * (1 + (dz_desc.lines / DZ_LINES));
diff --git a/PDP11/pdp11_rq.c b/PDP11/pdp11_rq.c
index dec1cbba..4ffc22f3 100644
--- a/PDP11/pdp11_rq.c
+++ b/PDP11/pdp11_rq.c
@@ -2949,7 +2949,12 @@ if (cp->ctype == DEFAULT_CTYPE)
 
 if (!plugs_inited ) {
     uint32 d, u = 0;
+    char uname[16];
 
+    sprintf (uname, "%s-TIMER", dptr->name);
+    sim_set_uname (&dptr->units[4], uname);
+    sprintf (uname, "%s-QUESVC", dptr->name);
+    sim_set_uname (&dptr->units[5], uname);
     plugs_inited  = TRUE;
     for (i = 0; i < RQ_NUMCT; i++) {
         for (d = 0; d < rq_devmap[i]->numunits - 2; d++) {
diff --git a/PDP11/pdp11_tq.c b/PDP11/pdp11_tq.c
index 77383134..9a17f9c2 100644
--- a/PDP11/pdp11_tq.c
+++ b/PDP11/pdp11_tq.c
@@ -2070,7 +2070,12 @@ static t_bool plugs_inited = FALSE;
 
 if (!plugs_inited ) {
     uint32 d;
+    char uname[16];
 
+    sprintf (uname, "%s-TIMER", dptr->name);
+    sim_set_uname (&dptr->units[4], uname);
+    sprintf (uname, "%s-QUESVC", dptr->name);
+    sim_set_uname (&dptr->units[5], uname);
     plugs_inited  = TRUE;
     for (d = 0; d < tq_dev.numunits - 2; d++)
         tq_unit[d].unit_plug = d;
diff --git a/PDP11/pdp11_xq.c b/PDP11/pdp11_xq.c
index 99c99f85..b96da91a 100644
--- a/PDP11/pdp11_xq.c
+++ b/PDP11/pdp11_xq.c
@@ -2554,7 +2554,19 @@ t_stat xq_reset(DEVICE* dptr)
 
   /* One time only initializations */
   if (!xq->var->initialized) {
+    char uname[16];
+
     xq->var->initialized = TRUE;
+    sprintf (uname, "%s-SVC", dptr->name);
+    sim_set_uname (&dptr->units[0], uname);
+    sprintf (uname, "%s-TMRSVC", dptr->name);
+    sim_set_uname (&dptr->units[1], uname);
+    sprintf (uname, "%s-STARTSVC", dptr->name);
+    sim_set_uname (&dptr->units[2], uname);
+    sprintf (uname, "%s-RCVSVC", dptr->name);
+    sim_set_uname (&dptr->units[3], uname);
+    sprintf (uname, "%s-SRQRSVC", dptr->name);
+    sim_set_uname (&dptr->units[4], uname);
     /* Set an initial MAC address in the DEC range */
     xq_setmac (dptr->units, 0, "08:00:2B:00:00:00/24", NULL);
     }
diff --git a/PDP11/pdp11_xu.c b/PDP11/pdp11_xu.c
index 14f31104..f86d6380 100644
--- a/PDP11/pdp11_xu.c
+++ b/PDP11/pdp11_xu.c
@@ -855,7 +855,13 @@ t_stat xu_reset(DEVICE* dptr)
   sim_debug(DBG_TRC, xu->dev, "xu_reset()\n");
   /* One time only initializations */
   if (!xu->var->initialized) {
+    char uname[16];
+
     xu->var->initialized = TRUE;
+    sprintf (uname, "%s-SVC", dptr->name);
+    sim_set_uname (&dptr->units[0], uname);
+    sprintf (uname, "%s-TMRSVC", dptr->name);
+    sim_set_uname (&dptr->units[1], uname);
     /* Set an initial MAC address in the DEC range */
     xu_setmac (dptr->units, 0, "08:00:2B:00:00:00/24", NULL);
     }