diff --git a/PDP11/pdp11_ddcmp.h b/PDP11/pdp11_ddcmp.h
index 19094e1c..00a59e71 100644
--- a/PDP11/pdp11_ddcmp.h
+++ b/PDP11/pdp11_ddcmp.h
@@ -194,6 +194,7 @@ static t_stat ddcmp_tmxr_get_packet_ln (TMLN *lp, const uint8 **pbuf, uint16 *ps
 {
 int32 c;
 size_t payloadsize;
+char msg[32];
 
 while (TMXR_VALID & (c = tmxr_getc_ln (lp))) {
     c &= ~TMXR_VALID;
@@ -224,7 +225,11 @@ while (TMXR_VALID & (c = tmxr_getc_ln (lp))) {
             *pbuf = lp->rxpb;
             *psize = DDCMP_HEADER_SIZE;
             lp->rxpboffset = 0;
-            ddcmp_packet_trace (DDCMP_DBG_PRCV, lp->mp->dptr, "<<< RCV Packet", lp->rxpb, *psize);
+            if (lp->mp->lines > 1)
+                sprintf (msg, "Line%d: <<< RCV Packet", (int)(lp-lp->mp->ldsc));
+            else
+                strcpy (msg, "<<< RCV Packet");
+            ddcmp_packet_trace (DDCMP_DBG_PRCV, lp->mp->dptr, msg, lp->rxpb, *psize);
             return SCPE_OK;
             }
         payloadsize  = ((lp->rxpb[2] & 0x3F) << 8)| lp->rxpb[1];
@@ -232,7 +237,11 @@ while (TMXR_VALID & (c = tmxr_getc_ln (lp))) {
             ++lp->rxpcnt;
             *pbuf = lp->rxpb;
             *psize = 10 + payloadsize;
-            ddcmp_packet_trace (DDCMP_DBG_PRCV, lp->mp->dptr, "<<< RCV Packet", lp->rxpb, *psize);
+            if (lp->mp->lines > 1)
+                sprintf (msg, "Line%d: <<< RCV Packet", (int)(lp-lp->mp->ldsc));
+            else
+                strcpy (msg, "<<< RCV Packet");
+            ddcmp_packet_trace (DDCMP_DBG_PRCV, lp->mp->dptr, msg, lp->rxpb, *psize);
             lp->rxpboffset = 0;
             return SCPE_OK;
             }
@@ -264,6 +273,7 @@ return SCPE_LOST;
 static t_stat ddcmp_tmxr_put_packet_ln (TMLN *lp, const uint8 *buf, size_t size)
 {
 t_stat r;
+char msg[32];
 
 if (!lp->conn)
     return SCPE_LOST;
@@ -278,7 +288,11 @@ if (lp->txpbsize < size) {
 memcpy (lp->txpb, buf, size);
 lp->txppsize = size;
 lp->txppoffset = 0;
-ddcmp_packet_trace (DDCMP_DBG_PXMT, lp->mp->dptr, ">>> XMT Packet", lp->txpb, lp->txppsize);
+if (lp->mp->lines > 1)
+    sprintf (msg, "Line%d: >>> XMT Packet", (int)(lp-lp->mp->ldsc));
+else
+    strcpy (msg, ">>> XMT Packet");
+ddcmp_packet_trace (DDCMP_DBG_PXMT, lp->mp->dptr, msg, lp->txpb, lp->txppsize);
 ++lp->txpcnt;
 while ((lp->txppoffset < lp->txppsize) && 
        (SCPE_OK == (r = tmxr_putc_ln (lp, lp->txpb[lp->txppoffset]))))
diff --git a/PDP11/pdp11_dmc.c b/PDP11/pdp11_dmc.c
index 8bb311b5..dc42306f 100644
--- a/PDP11/pdp11_dmc.c
+++ b/PDP11/pdp11_dmc.c
@@ -1692,7 +1692,7 @@ void dmc_setinint(CTLR *controller)
 if (!dmc_is_iei_set(controller))
     return;
 if (!controller->in_int) {
-    sim_debug(DBG_INT, controller->device, "SET_INT(RX:%s%d)\n", controller->device->name, controller->index);
+    sim_debug(DBG_INT, controller->device, "SET_INT(RX:%s%d) summary=0x%x\n", controller->device->name, controller->index, dmc_ini_summary);
     }
 controller->in_int = 1;
 dmc_ini_summary |= (1u << controller->index);
@@ -1703,7 +1703,7 @@ void dmc_clrinint(CTLR *controller)
 {
 controller->in_int = 0;
 if (dmc_ini_summary & (1u << controller->index)) {
-    sim_debug(DBG_INT, controller->device, "CLR_INT(RX:%s%d)\n", controller->device->name, controller->index);
+    sim_debug(DBG_INT, controller->device, "CLR_INT(RX:%s%d) summary=0x%x\n", controller->device->name, controller->index, dmc_ini_summary);
     }
 dmc_ini_summary &= ~(1u << controller->index);
 if (!dmc_ini_summary)
@@ -1717,7 +1717,7 @@ void dmc_setoutint(CTLR *controller)
 if (!dmc_is_ieo_set(controller))
     return;
 if (!controller->out_int) {
-    sim_debug(DBG_INT, controller->device, "SET_INT(TX:%s%d)\n", controller->device->name, controller->index);
+    sim_debug(DBG_INT, controller->device, "SET_INT(TX:%s%d) summary=0x%x\n", controller->device->name, controller->index, dmc_outi_summary );
     }
 controller->out_int = 1;
 dmc_outi_summary |= (1u << controller->index);
@@ -1728,14 +1728,13 @@ void dmc_clroutint(CTLR *controller)
 {
 controller->out_int = 0;
 if (dmc_outi_summary & (1u << controller->index)) {
-    sim_debug(DBG_INT, controller->device, "CLR_INT(TX:%s%d)\n", controller->device->name, controller->index);
+    sim_debug(DBG_INT, controller->device, "CLR_INT(TX:%s%d) summary=0x%x\n", controller->device->name, controller->index, dmc_outi_summary);
     }
 dmc_outi_summary &= ~(1u << controller->index);
 if (!dmc_outi_summary)
     CLR_INT(DMCTX);
 else
     SET_INT(DMCTX);
-CLR_INT(DMCTX);
 }
 
 int dmc_getsel(int addr)
@@ -3397,7 +3396,7 @@ for (i=0; i<DMC_NUMDEVICE+DMP_NUMDEVICE; i++) {
         DIB *dib = (DIB *)controller->device->ctxt;
         ans = dib->vec + (8 * (int)(controller->unit - controller->device->units));
         dmc_clrinint(controller);
-        sim_debug(DBG_INT, controller->device, "RXINTA Device %d - Vector: 0x%x\n", (int)(controller->unit-controller->device->units), ans);
+        sim_debug(DBG_INT, controller->device, "RXINTA Device %d - Vector: 0x%x(0%3o)\n", (int)(controller->unit-controller->device->units), ans, ans);
         break;
         }
     }
@@ -3416,7 +3415,7 @@ for (i=0; i<DMC_NUMDEVICE+DMP_NUMDEVICE; i++) {
         DIB *dib = (DIB *)controller->device->ctxt;
         ans = dib->vec + 4 + (8 * (int)(controller->unit - controller->device->units));
         dmc_clroutint(controller);
-        sim_debug(DBG_INT, controller->device, "TXINTA Device %d - Vector: 0x%x\n", (int)(controller->unit-controller->device->units), ans);
+        sim_debug(DBG_INT, controller->device, "TXINTA Device %d - Vector: 0x%x(0%3o)\n", (int)(controller->unit-controller->device->units), ans, ans);
         break;
         }
     }