diff --git a/test/w5100_peer.c b/test/w5100_peer.c
index 907254b..ed456bd 100644
--- a/test/w5100_peer.c
+++ b/test/w5100_peer.c
@@ -99,14 +99,14 @@ void main(void)
       {
         unsigned i;
 
-        len = 512;
+        len = 500;
         for (i = 0; i < len; ++i)
         {
           buf[i] = i;
         }
         if (tcp == INVALID_SOCKET)
         {
-          printf("Send Len $%04X To %s", len, inet_ntoa(remote.sin_addr));
+          printf("Send Len %d To %s", len, inet_ntoa(remote.sin_addr));
           if (sendto(udp, buf, len, 0, (SOCKADDR *)&remote, sizeof(remote)) == SOCKET_ERROR)
           {
             return;
@@ -114,7 +114,7 @@ void main(void)
         }
         else
         {
-          printf("Send Len $%04X", len);
+          printf("Send Len %d", len);
           if (send(tcp, buf, len, 0) == SOCKET_ERROR)
           {
             return;
@@ -135,7 +135,7 @@ void main(void)
     }
     else if (len)
     {
-      printf("Recv Len $%04X From %s", len, inet_ntoa(remote.sin_addr));
+      printf("Recv Len %d From %s", len, inet_ntoa(remote.sin_addr));
       dump(buf, len);
     }
 
@@ -174,7 +174,7 @@ void main(void)
       }
       else if (len)
       {
-        printf("Recv Len $%04X", len);
+        printf("Recv Len %d", len);
         dump(buf, len);
       }
       else
diff --git a/test/w5100_tcp_main.c b/test/w5100_tcp_main.c
index 30e92fd..06ecd16 100644
--- a/test/w5100_tcp_main.c
+++ b/test/w5100_tcp_main.c
@@ -21,7 +21,7 @@ struct
 }
 parms =
 {
-  {192, 168,   0,   2},
+  {192, 168,   0,   2}, // IP addr of machine running w5100_peer.c
   {192, 168,   0, 123},
   {255, 255, 255,   0},
   {192, 168,   0,   1}
@@ -64,8 +64,8 @@ void main(void)
     {
       unsigned i;
 
-      len = 512;
-      printf("Send Len $%04X", len);
+      len = 500;
+      printf("Send Len %d", len);
       while (!w5100_send_init(len))
       {
         printf("!");
@@ -88,7 +88,7 @@ void main(void)
     {
       unsigned i;
 
-      printf("Recv Len $%04X", len);
+      printf("Recv Len %d", len);
       for (i = 0; i < len; ++i)
       {
         if ((i % 24) == 0)
diff --git a/test/w5100_udp_main.c b/test/w5100_udp_main.c
index 014d730..f723840 100644
--- a/test/w5100_udp_main.c
+++ b/test/w5100_udp_main.c
@@ -20,7 +20,7 @@ struct
 }
 parms =
 {
-  {192, 168,   0,   2},
+  {192, 168,   0,   2}, // IP addr of machine running w5100_peer.c
   {192, 168,   0, 123},
   {255, 255, 255,   0},
   {192, 168,   0,   1}
@@ -52,11 +52,11 @@ void main(void)
     {
       unsigned i;
 
-      len = 512;
-      printf("Send Len $%04X To %d.%d.%d.%d", len, parms.serverip[0],
-                                                   parms.serverip[1],
-                                                   parms.serverip[2],
-                                                   parms.serverip[3]);
+      len = 500;
+      printf("Send Len %d To %d.%d.%d.%d", len, parms.serverip[0],
+                                                parms.serverip[1],
+                                                parms.serverip[2],
+                                                parms.serverip[3]);
       while (!w5100_send_init(len))
       {
         printf("!");
@@ -74,10 +74,10 @@ void main(void)
     {
       unsigned i;
 
-      printf("Recv Len $%04X From %d.%d.%d.%d", len, parms.serverip[0],
-                                                     parms.serverip[1],
-                                                     parms.serverip[2],
-                                                     parms.serverip[3]);
+      printf("Recv Len %d From %d.%d.%d.%d", len, parms.serverip[0],
+                                                  parms.serverip[1],
+                                                  parms.serverip[2],
+                                                  parms.serverip[3]);
       for (i = 0; i < len; ++i)
       {
         if ((i % 24) == 0)