diff --git a/PDP11/pdp11_xq.c b/PDP11/pdp11_xq.c
index e2bbc058..b9ac5182 100644
--- a/PDP11/pdp11_xq.c
+++ b/PDP11/pdp11_xq.c
@@ -1940,7 +1940,9 @@ t_stat xq_process_turbo_xbdl(CTLR* xq)
       xq->var->xring[i].tmd2 = XQ_TMD2_RON | XQ_TMD2_TON;
     }
 
-    Map_ReadW (tdra+(uint32)(((char *)(&xq->var->xring[xq->var->tbindx].tmd3))-((char *)&xq->var->xring)), sizeof(xq->var->xring[xq->var->tbindx].tmd3), (uint16 *)&xq->var->xring[xq->var->tbindx].tmd3);
+    status = Map_ReadW (tdra+(uint32)(((char *)(&xq->var->xring[xq->var->tbindx].tmd3))-((char *)&xq->var->xring)), sizeof(xq->var->xring[xq->var->tbindx].tmd3), (uint16 *)&xq->var->xring[xq->var->tbindx].tmd3);
+    if (status != SCPE_OK)
+      return xq_nxm_error(xq);
     if (xq->var->xring[xq->var->tbindx].tmd3 & XQ_TMD3_OWN)
       xq->var->xring[i].tmd2 |= XQ_TMD2_EOR;
 
@@ -2024,7 +2026,7 @@ t_stat xq_process_loopback(CTLR* xq, ETH_PACK* pack)
   ++xq->var->stats.loop;
 
   if (DBG_PCK & xq->dev->dctrl)
-      eth_packet_trace_ex(xq->var->etherface, response.msg, response.len, ((function == 1) ? "xq-loopbackreply" : "xq-loopbackforward"), DBG_DAT & xq->dev->dctrl, DBG_PCK);
+      eth_packet_trace_ex(xq->var->etherface, response.msg, response.len, "xq-loopbackforward", DBG_DAT & xq->dev->dctrl, DBG_PCK);
 
   return status;
 }
diff --git a/PDP11/pdp11_xu.c b/PDP11/pdp11_xu.c
index 38cc86e6..8343ce5a 100644
--- a/PDP11/pdp11_xu.c
+++ b/PDP11/pdp11_xu.c
@@ -593,7 +593,7 @@ t_stat xu_process_loopback(CTLR* xu, ETH_PACK* pack)
   ++xu->var->stats.loopf;
 
   if (DBG_PCK & xu->dev->dctrl)
-      eth_packet_trace_ex(xu->var->etherface, response.msg, response.len, ((function == 1) ? "xu-loopbackreply" : "xu-loopbackforward"), DBG_DAT & xu->dev->dctrl, DBG_PCK);
+      eth_packet_trace_ex(xu->var->etherface, response.msg, response.len, "xu-loopbackforward", DBG_DAT & xu->dev->dctrl, DBG_PCK);
 
   return status;
 }
diff --git a/sim_ether.c b/sim_ether.c
index 16d383db..d2d0ae0c 100644
--- a/sim_ether.c
+++ b/sim_ether.c
@@ -3116,6 +3116,9 @@ int write_queue_size = 1;
 /* make sure device exists */
 if ((!dev) || (dev->eth_api == ETH_API_NONE)) return SCPE_UNATT;
 
+if (packet->len > sizeof (packet->msg)) /* packet ovesized? */
+    return SCPE_IERR;                   /* that's no good! */
+
 /* Get a buffer */
 pthread_mutex_lock (&dev->writer_lock);
 if (NULL != (request = dev->write_buffers))