diff --git a/src/jtag3.c b/src/jtag3.c
index 080244d2..015845eb 100644
--- a/src/jtag3.c
+++ b/src/jtag3.c
@@ -2556,8 +2556,12 @@ void jtag3_print_parms1(const PROGRAMMER *pgm, const char *p, FILE *fp) {
   unsigned char prog_mode[2];
   unsigned char buf[3];
 
+  if (jtag3_getparm(pgm, SCOPE_GENERAL, 1, PARM3_VTARGET, buf, 2) < 0)
+    return;
+  msg_info("%sVtarget         : %.2f V\n", p, b2_to_u16(buf)/1000.0);
+
   // Print clocks if programmer typ is not TPI
-  if (strcmp(pgm->type, "JTAGICE3_TPI")) {
+  if (!str_eq(pgm->type, "JTAGICE3_TPI")) {
     // Get current programming mode and target type from to determine what data to print
     if (jtag3_getparm(pgm, SCOPE_AVR, 1, PARM3_CONNECTION, prog_mode, 1) < 0)
       return;
@@ -2589,10 +2593,6 @@ void jtag3_print_parms1(const PROGRAMMER *pgm, const char *p, FILE *fp) {
     }
   }
 
-  if (jtag3_getparm(pgm, SCOPE_GENERAL, 1, PARM3_VTARGET, buf, 2) < 0)
-    return;
-  msg_info("%sVtarget         : %.2f V\n", p, b2_to_u16(buf)/1000.0);
-
   // Print features unique to the Power Debugger
   for(LNODEID ln=lfirst(pgm->id); ln; ln=lnext(ln)) {
     if(str_starts(ldata(ln), "powerdebugger")) {
@@ -2663,7 +2663,6 @@ void jtag3_print_parms1(const PROGRAMMER *pgm, const char *p, FILE *fp) {
       break;
     }
   }
-
   fmsg_out(fp, "\n");
 }
 
@@ -2813,6 +2812,9 @@ static int jtag3_initialize_tpi(const PROGRAMMER *pgm, const AVRPART *p) {
   unsigned char* resp;
   int status;
 
+  if (verbose && quell_progress < 2)
+    jtag3_print_parms1(pgm, progbuf, stderr);
+
   pmsg_notice2("jtag3_initialize_tpi() start\n");
 
   cmd[0] = XPRG_CMD_ENTER_PROGMODE;
diff --git a/src/stk500v2.c b/src/stk500v2.c
index d1015c0b..c5b7daa2 100644
--- a/src/stk500v2.c
+++ b/src/stk500v2.c
@@ -377,6 +377,13 @@ b2_to_u16(unsigned char *b)
   return l;
 }
 
+static void
+u16_to_b2(unsigned char *b, unsigned short l)
+{
+  b[0] = l & 0xff;
+  b[1] = (l >> 8) & 0xff;
+}
+
 static int stk500v2_send_mk2(const PROGRAMMER *pgm, unsigned char *data, size_t len) {
   if (serial_send(&pgm->fd, data, len) != 0) {
     pmsg_error("unable to send command to serial port\n");
@@ -1350,6 +1357,26 @@ static int stk500v2_jtag3_initialize(const PROGRAMMER *pgm, const AVRPART *p) {
     }
   }
 
+  // Read or write target voltage
+  if (PDATA(pgm)->vtarg_get || PDATA(pgm)->vtarg_set) {
+    // Read current target voltage set value
+    unsigned char buf[2];
+    if (jtag3_getparm(pgmcp, SCOPE_GENERAL, 1, PARM3_VADJUST, buf, 2) < 0)
+      return -1;
+    double vtarg_read = b2_to_u16(buf) / 1000.0;
+    if (PDATA(pgm)->vtarg_get)
+      msg_info("Target voltage value read as %.2fV\n", vtarg_read);
+    // Write target voltage value
+    else {
+      u16_to_b2(buf, (unsigned)(PDATA(pgm)->vtarg_data * 1000));
+      msg_info("Changing target voltage from %.2f to %.2fV\n", vtarg_read, PDATA(pgm)->vtarg_data);
+      if (jtag3_setparm(pgmcp, SCOPE_GENERAL, 1, PARM3_VADJUST, buf, sizeof(buf)) < 0) {
+        msg_warning("Cannot set target voltage %.2fV\n", PDATA(pgm)->vtarg_data);
+        return -1;
+      }
+    }
+  }
+
   free(pgmcp);
 
   /*
@@ -1619,6 +1646,29 @@ static int stk500v2_jtag3_parseextparms(const PROGRAMMER *pgm, const LISTID extp
       }
     }
 
+    else if (str_starts(extended_param, "vtarg")) {
+      if (pgm->extra_features & HAS_VTARG_ADJ) {
+        // Set target voltage
+        if (str_starts(extended_param, "vtarg=") ) {
+          double vtarg_set_val = 0;
+          int sscanf_success = sscanf(extended_param, "vtarg=%lf", &vtarg_set_val);
+          PDATA(pgm)->vtarg_data = (double)((int)(vtarg_set_val * 100 + .5)) / 100;
+          if (sscanf_success < 1 || vtarg_set_val < 0) {
+            pmsg_error("invalid vtarg value '%s'\n", extended_param);
+            rv = -1;
+            break;
+          }
+          PDATA(pgm)->vtarg_set = true;
+        }
+        // Get target voltage
+        else if(str_eq(extended_param, "vtarg"))
+          PDATA(pgm)->vtarg_get = true;
+        else
+          break;
+        continue;
+      }
+    }
+
     else if (str_eq(extended_param, "help")) {
       char *prg = (char *)ldata(lfirst(pgm->id));
       msg_error("%s -c %s extended options:\n", progname, prg);
@@ -3206,7 +3256,6 @@ static void stk500v2_display(const PROGRAMMER *pgm, const char *p) {
     PROGRAMMER *pgmcp = pgm_dup(pgm);
     pgmcp->cookie = PDATA(pgm)->chained_pdata;
     jtag3_display(pgmcp, p);
-    msg_info("\n");
     pgm_free(pgmcp);
   }
   stk500v2_print_parms1(pgm, p, stderr);
@@ -3301,7 +3350,7 @@ static void stk500v2_print_parms1(const PROGRAMMER *pgm, const char *p, FILE *fp
       pgmcp->id = lcreat(NULL, 0);
       // Copy pgm->id contents over to pgmcp->id
       for(LNODEID ln=lfirst(pgm->id); ln; ln=lnext(ln))
-        ladd(pgmcp->id, cfg_strdup("stk500v2_print_parms1()", ldata(ln)));
+        ladd(pgmcp->id, cfg_strdup("stk500v2_display()", ldata(ln)));
       jtag3_print_parms1(pgmcp, p, fp);
       pgm_free(pgmcp);
     }
diff --git a/src/stk500v2_private.h b/src/stk500v2_private.h
index b58cc5b4..f2c27b44 100644
--- a/src/stk500v2_private.h
+++ b/src/stk500v2_private.h
@@ -280,6 +280,11 @@ struct pdata
   bool vtarg_switch_set;
   unsigned char vtarg_switch_data[2];
 
+  /* Get/set flags for adjustable target voltage */
+  bool vtarg_get;
+  bool vtarg_set;
+  double vtarg_data;
+
   const AVRPART *lastpart;
 
   /* Start address of Xmega boot area */