diff --git a/GRI/gri_cpu.c b/GRI/gri_cpu.c
index 75af6aba..60c22a19 100644
--- a/GRI/gri_cpu.c
+++ b/GRI/gri_cpu.c
@@ -509,6 +509,10 @@ while (reason == 0) {                                   /* loop until halted */
             case 07:                                    /* src > 0 */
                 jmp = (t != 0) && !(t & SIGN);
                 break;
+
+            default:                                    /* Impossible Case - Silence Coverity */
+                jmp = 0;
+                break;
             }
 
         if (jmp) {                                      /* jump taken? */
diff --git a/PDP10/pdp10_sys.c b/PDP10/pdp10_sys.c
index 25f60e77..f063cde9 100644
--- a/PDP10/pdp10_sys.c
+++ b/PDP10/pdp10_sys.c
@@ -345,7 +345,7 @@ do {
         break;
 
     case EXE_PDV:                                       /* optional */
-        fseek (fileref, bsz * sizeof (d10), SEEK_CUR);  /* skip data */
+        (void)fseek (fileref, bsz * sizeof (d10), SEEK_CUR);/* skip data */
         break;
 
     case EXE_VEC:                                       /* entry vec */
@@ -374,7 +374,7 @@ for (i = 0; i < ndir; i = i + 2) {                      /* loop thru dir */
     rpt = ((int32) ((dirbuf[i + 1] >> 27) + 1)) & 0777; /* repeat count */
     for (j = 0; j < rpt; j++, mpage++) {                /* loop thru rpts */
         if (fpage) {                                    /* file pages? */
-            fseek (fileref, (fpage << PAG_V_PN) * sizeof (d10), SEEK_SET);
+            (void)fseek (fileref, (fpage << PAG_V_PN) * sizeof (d10), SEEK_SET);
             wc = fxread (pagbuf, sizeof (d10), PAG_SIZE, fileref);
             if (wc < PAG_SIZE)
                 return SCPE_FMT;
@@ -424,7 +424,7 @@ else {
            fmt = FMT_S;
         else fmt = FMT_R;                               /* RIM has SA == 0 */
         }
-    fseek (fileref, 0, SEEK_SET);                       /* rewind */
+    (void)fseek (fileref, 0, SEEK_SET);                 /* rewind */
     }
 
 switch (fmt) {                                          /* case fmt */
diff --git a/PDP11/pdp11_dup.c b/PDP11/pdp11_dup.c
index 537a57fc..8dc3151c 100644
--- a/PDP11/pdp11_dup.c
+++ b/PDP11/pdp11_dup.c
@@ -1040,7 +1040,7 @@ int32 dup, active, attached;
 
 sim_debug(DBG_TRC, DUPDPTR, "dup_poll_svc()\n");
 
-tmxr_poll_conn(&dup_desc);
+(void)tmxr_poll_conn(&dup_desc);
 tmxr_poll_rx (&dup_desc);
 tmxr_poll_tx (&dup_desc);
 for (dup=active=attached=0; dup < dup_desc.lines; dup++) {
diff --git a/PDP11/pdp11_rq.c b/PDP11/pdp11_rq.c
index 9015d27d..475adf4f 100644
--- a/PDP11/pdp11_rq.c
+++ b/PDP11/pdp11_rq.c
@@ -2709,7 +2709,7 @@ void rq_ring_int (MSC *cp, struct uq_ring *ring)
 uint32 iadr = cp->comm + ring->ioff;                    /* addr intr wd */
 uint16 flag = 1;
 
-Map_WriteW (iadr, 2, &flag);                            /* write flag */
+(void)Map_WriteW (iadr, 2, &flag);                      /* write flag */
 if (cp->s1dat & SA_S1H_VEC)                             /* if enb, intr */
     rq_setint (cp);
 return;
diff --git a/PDP11/pdp11_tq.c b/PDP11/pdp11_tq.c
index cae0a228..41e7808c 100644
--- a/PDP11/pdp11_tq.c
+++ b/PDP11/pdp11_tq.c
@@ -2004,7 +2004,7 @@ void tq_ring_int (struct uq_ring *ring)
 uint32 iadr = tq_comm + ring->ioff;                     /* addr intr wd */
 uint16 flag = 1;
 
-Map_WriteW (iadr, 2, &flag);                            /* write flag */
+(void)Map_WriteW (iadr, 2, &flag);                      /* write flag */
 if (tq_dib.vec)                                         /* if enb, intr */
     SET_INT (TQ);
 return;
diff --git a/PDP11/pdp11_xq.c b/PDP11/pdp11_xq.c
index 1e52089c..66904fc3 100644
--- a/PDP11/pdp11_xq.c
+++ b/PDP11/pdp11_xq.c
@@ -1822,7 +1822,9 @@ t_stat xq_process_turbo_rbdl(CTLR* xq)
       xq->var->ReadQ.loss = 0;          /* reset loss counter */
     }
 
-    Map_ReadW (rdra+(uint32)(((char *)(&xq->var->rring[xq->var->rbindx].rmd3))-((char *)&xq->var->rring)), sizeof(xq->var->rring[xq->var->rbindx].rmd3), (uint16 *)&xq->var->rring[xq->var->rbindx].rmd3);
+    status = Map_ReadW (rdra+(uint32)(((char *)(&xq->var->rring[xq->var->rbindx].rmd3))-((char *)&xq->var->rring)), sizeof(xq->var->rring[xq->var->rbindx].rmd3), (uint16 *)&xq->var->rring[xq->var->rbindx].rmd3);
+    if (status != SCPE_OK)
+      return xq_nxm_error(xq);
     if (xq->var->rring[xq->var->rbindx].rmd3 & XQ_RMD3_OWN)
       xq->var->rring[i].rmd2 |= XQ_RMD2_EOR;
 
diff --git a/sim_console.c b/sim_console.c
index a406035f..2382c98c 100644
--- a/sim_console.c
+++ b/sim_console.c
@@ -873,7 +873,7 @@ int line = rem->line;
 
 if ((!sim_oline) && (sim_log)) {
     fflush (sim_log);
-    sim_fseeko (sim_log, sim_rem_cmd_log_start, SEEK_SET);
+    (void)sim_fseeko (sim_log, sim_rem_cmd_log_start, SEEK_SET);
     cbuf[sizeof(cbuf)-1] = '\0';
     while (fgets (cbuf, sizeof(cbuf)-1, sim_log))
         tmxr_linemsgf (lp, "%s", cbuf);