diff --git a/sim_ether.c b/sim_ether.c
index 5a19e349..27325791 100644
--- a/sim_ether.c
+++ b/sim_ether.c
@@ -1805,7 +1805,7 @@ dev->throttle_mask = (1 << dev->throttle_burst) - 1;
 return SCPE_OK;
 }
 
-static t_stat _eth_open_port(char *savname, int *eth_api, void **handle, SOCKET *fd_handle, char errbuf[PCAP_ERRBUF_SIZE], char *bpf_filter, void *opaque)
+static t_stat _eth_open_port(char *savname, int *eth_api, void **handle, SOCKET *fd_handle, char errbuf[PCAP_ERRBUF_SIZE], char *bpf_filter, void *opaque, DEVICE *dptr, uint32 dbit)
 {
 int bufsz = (BUFSIZ < ETH_MAX_PACKET) ? ETH_MAX_PACKET : BUFSIZ;
 
@@ -1924,7 +1924,7 @@ else { /* !tap: */
   else { /* !vde: */
     if (0 == strncmp("nat:", savname, 4)) {
 #if defined(HAVE_SLIRP_NETWORK)
-      if (!(*handle = (void*) sim_slirp_open(savname+4, opaque, &_slirp_callback)))
+      if (!(*handle = (void*) sim_slirp_open(savname+4, opaque, &_slirp_callback, dptr, dbit)))
         strncpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE-1);
       else {
         *eth_api = ETH_API_NAT;
@@ -2081,7 +2081,7 @@ else {
     }
   }
 
-r = _eth_open_port(savname, &dev->eth_api, &dev->handle, &dev->fd_handle, errbuf, NULL, (void *)dev);
+r = _eth_open_port(savname, &dev->eth_api, &dev->handle, &dev->fd_handle, errbuf, NULL, (void *)dev, dptr, dbit);
 
 if (errbuf[0]) {
   sim_printf ("Eth: open error - %s\r\n", errbuf);
@@ -2462,7 +2462,7 @@ if (dev->error_needs_reset) {
   _eth_close_port(dev->eth_api, (pcap_t *)dev->handle, dev->fd_handle);
   sim_os_sleep (ETH_ERROR_REOPEN_PAUSE);
 
-  r = _eth_open_port(dev->name, &dev->eth_api, &dev->handle, &dev->fd_handle, errbuf, dev->bpf_filter, (void *)dev);
+  r = _eth_open_port(dev->name, &dev->eth_api, &dev->handle, &dev->fd_handle, errbuf, dev->bpf_filter, (void *)dev, dev->dptr, dev->dbit);
   dev->error_needs_reset = FALSE;
   if (r == SCPE_OK)
     sim_printf ("%s ReOpened: %s \n", msg, dev->name);
diff --git a/slirp/simh/sim_slirp.c b/slirp/simh/sim_slirp.c
index 3780e94d..d3fd45fd 100644
--- a/slirp/simh/sim_slirp.c
+++ b/slirp/simh/sim_slirp.c
@@ -144,9 +144,11 @@ struct sim_slirp {
     pthread_mutex_t write_buffer_lock;
     void *opaque;               /* opaque value passed during packet delivery */
     packet_callback callback;   /* slirp arriving packet delivery callback */
+    DEVICE *dptr;
+    uint32 dbit;
     };
 
-SLIRP *sim_slirp_open (const char *args, void *opaque, packet_callback callback)
+SLIRP *sim_slirp_open (const char *args, void *opaque, packet_callback callback, DEVICE *dptr, uint32 dbit)
 {
 SLIRP *slirp = (SLIRP *)g_malloc0(sizeof(*slirp));
 char *targs = g_strdup (args);
@@ -294,6 +296,8 @@ else {
     pfd.fd = slirp->db_chime;
     pfd.events = G_IO_IN;
     g_array_append_val(slirp->gpollfds, pfd);
+    slirp->dbit = dbit;
+    slirp->dptr = dptr;
     
     sim_slirp_show(slirp, stdout);
     if (sim_log && (sim_log != stdout))
@@ -514,14 +518,14 @@ if (select_ret) {
         /* consume the doorbell wakeup ring */
         recv (slirp->db_chime, buf, sizeof (buf), 0);
         }
-    fprintf (stderr, "Select returned %d\r\n", select_ret);
+    sim_debug (slirp->dbit, slirp->dptr, "Select returned %d\r\n", select_ret);
     for (i=0; i<nfds+1; i++) {
         if (FD_ISSET(i, &rfds) || FD_ISSET(i, &save_rfds))
-            fprintf (stderr, "%d: save_rfd=%d, rfd=%d\r\n", i, FD_ISSET(i, &save_rfds), FD_ISSET(i, &rfds));
+            sim_debug (slirp->dbit, slirp->dptr, "%d: save_rfd=%d, rfd=%d\r\n", i, FD_ISSET(i, &save_rfds), FD_ISSET(i, &rfds));
         if (FD_ISSET(i, &wfds) || FD_ISSET(i, &save_wfds))
-            fprintf (stderr, "%d: save_wfd=%d, wfd=%d\r\n", i, FD_ISSET(i, &save_wfds), FD_ISSET(i, &wfds));
+            sim_debug (slirp->dbit, slirp->dptr, "%d: save_wfd=%d, wfd=%d\r\n", i, FD_ISSET(i, &save_wfds), FD_ISSET(i, &wfds));
         if (FD_ISSET(i, &xfds) || FD_ISSET(i, &save_xfds))
-            fprintf (stderr, "%d: save_xfd=%d, xfd=%d\r\n", i, FD_ISSET(i, &save_xfds), FD_ISSET(i, &xfds));
+            sim_debug (slirp->dbit, slirp->dptr, "%d: save_xfd=%d, xfd=%d\r\n", i, FD_ISSET(i, &save_xfds), FD_ISSET(i, &xfds));
             }
     }
 return select_ret + 1;  /* Force dispatch even on timeout */
diff --git a/slirp/simh/sim_slirp.h b/slirp/simh/sim_slirp.h
index 7d16e395..00493ff3 100644
--- a/slirp/simh/sim_slirp.h
+++ b/slirp/simh/sim_slirp.h
@@ -8,7 +8,7 @@ typedef struct sim_slirp SLIRP;
 
 typedef void (*packet_callback)(void *opaque, const unsigned char *buf, int len);
 
-SLIRP *sim_slirp_open (const char *args, void *opaque, packet_callback callback);
+SLIRP *sim_slirp_open (const char *args, void *opaque, packet_callback callback, DEVICE *dptr, uint32 dbit);
 void sim_slirp_close (SLIRP *slirp);
 int sim_slirp_send (SLIRP *slirp, const char *msg, size_t len, int flags);
 int sim_slirp_select (SLIRP *slirp, int ms_timeout);