diff --git a/src/jtag3.c b/src/jtag3.c
index 4f22d824..b5008d01 100644
--- a/src/jtag3.c
+++ b/src/jtag3.c
@@ -2364,8 +2364,8 @@ static void jtag3_display(PROGRAMMER * pgm, const char * p)
   memmove(resp, resp + 3, status - 3);
   resp[status - 3] = 0;
 
-  avrdude_message(MSG_INFO, "%sICE hardware version: %d\n", p, parms[0]);
-  avrdude_message(MSG_INFO, "%sICE firmware version: %d.%02d (rel. %d)\n", p,
+  avrdude_message(MSG_INFO, "%sICE HW version  : %d\n", p, parms[0]);
+  avrdude_message(MSG_INFO, "%sICE FW version  : %d.%02d (rel. %d)\n", p,
 	  parms[1], parms[2],
 	  (parms[3] | (parms[4] << 8)));
   avrdude_message(MSG_INFO, "%sSerial number   : %s", p, resp);
@@ -2381,27 +2381,39 @@ static void jtag3_print_parms1(PROGRAMMER * pgm, const char * p)
     return;
 
   avrdude_message(MSG_INFO, "%sVtarget         : %.2f V\n", p,
-	  b2_to_u16(buf) / 1000.0);
+    b2_to_u16(buf) / 1000.0);
 
   if (jtag3_getparm(pgm, SCOPE_AVR, 1, PARM3_CLK_MEGA_PROG, buf, 2) < 0)
     return;
-  avrdude_message(MSG_INFO, "%sJTAG clock megaAVR/program: %u kHz\n", p,
-	  b2_to_u16(buf));
+
+  if (b2_to_u16(buf) > 0) {
+    avrdude_message(MSG_INFO, "%sJTAG clock megaAVR/program   : %u kHz\n", p,
+      b2_to_u16(buf));
+  }
 
   if (jtag3_getparm(pgm, SCOPE_AVR, 1, PARM3_CLK_MEGA_DEBUG, buf, 2) < 0)
     return;
-  avrdude_message(MSG_INFO, "%sJTAG clock megaAVR/debug:   %u kHz\n", p,
-	  b2_to_u16(buf));
+
+  if (b2_to_u16(buf) > 0) {
+    avrdude_message(MSG_INFO, "%sJTAG clock megaAVR/debug     : %u kHz\n", p,
+      b2_to_u16(buf));
+  }
 
   if (jtag3_getparm(pgm, SCOPE_AVR, 1, PARM3_CLK_XMEGA_JTAG, buf, 2) < 0)
     return;
-  avrdude_message(MSG_INFO, "%sJTAG clock Xmega: %u kHz\n", p,
-	  b2_to_u16(buf));
+
+  if (b2_to_u16(buf) > 0) {
+    avrdude_message(MSG_INFO, "%sJTAG clock Xmega             : %u kHz\n", p,
+      b2_to_u16(buf));
+  }
 
   if (jtag3_getparm(pgm, SCOPE_AVR, 1, PARM3_CLK_XMEGA_PDI, buf, 2) < 0)
     return;
-  avrdude_message(MSG_INFO, "%sPDI/UPDI clock Xmega : %u kHz\n\n", p,
-	  b2_to_u16(buf));
+
+  if (b2_to_u16(buf) > 0) {
+    avrdude_message(MSG_INFO, "%sPDI/UPDI clock Xmega/megaAVR : %u kHz\n\n", p,
+      b2_to_u16(buf));
+  }
 }
 
 static void jtag3_print_parms(PROGRAMMER * pgm)