diff --git a/Config.h b/Config.h
index 2715f49..73e716b 100644
--- a/Config.h
+++ b/Config.h
@@ -52,11 +52,6 @@
 #define ARDUINO_DUE_ZUM_V10
 #endif
 
-// Use the native USB port instead of the programming port
-// The native port is recommended when using FM network
-// as the rpogramming port does not have the required throughput
-// #define ARDUINO_DUE_USE_NATIVE_USB_PORT
-
 // For the SP8NTH board
 // #define ARDUINO_DUE_NTH
 
diff --git a/SerialArduino.cpp b/SerialArduino.cpp
index fb79861..db49759 100644
--- a/SerialArduino.cpp
+++ b/SerialArduino.cpp
@@ -30,11 +30,7 @@ void CSerialPort::beginInt(uint8_t n, int speed)
 {
   switch (n) {
     case 1U:
-#if defined(ARDUINO_DUE_USE_NATIVE_USB_PORT)
-      SerialUSB.begin(speed);
-#else
       Serial.begin(speed);
-#endif
       break;
     case 2U:
       Serial2.begin(speed);
@@ -51,11 +47,7 @@ int CSerialPort::availableInt(uint8_t n)
 {
   switch (n) {
     case 1U:
-#if defined(ARDUINO_DUE_USE_NATIVE_USB_PORT)
-      return SerialUSB.available();
-#else
       return Serial.available();
-#endif
     case 2U:
       return Serial2.available();
     case 3U:
@@ -69,11 +61,7 @@ int CSerialPort::availableForWriteInt(uint8_t n)
 {
   switch (n) {
     case 1U:
-#if defined(ARDUINO_DUE_USE_NATIVE_USB_PORT)
-      return SerialUSB.availableForWrite();
-#else
       return Serial.availableForWrite();
-#endif
     case 2U:
       return Serial2.availableForWrite();
     case 3U:
@@ -87,11 +75,7 @@ uint8_t CSerialPort::readInt(uint8_t n)
 {
   switch (n) {
     case 1U:
-#if defined(ARDUINO_DUE_USE_NATIVE_USB_PORT)
-      return SerialUSB.read();
-#else
       return Serial.read();
-#endif
     case 2U:
       return Serial2.read();
     case 3U:
@@ -105,17 +89,10 @@ void CSerialPort::writeInt(uint8_t n, const uint8_t* data, uint16_t length, bool
 {
   switch (n) {
     case 1U:
-#if defined(ARDUINO_DUE_USE_NATIVE_USB_PORT)
-      SerialUSB.write(data, length);
-      if (flush)
-        SerialUSB.flush();
-      break;
-#else
       Serial.write(data, length);
       if (flush)
         Serial.flush();
       break;
-#endif
     case 2U:
       Serial2.write(data, length);
       if (flush)
diff --git a/SerialRB.cpp b/SerialRB.cpp
deleted file mode 100644
index ca3350d..0000000
--- a/SerialRB.cpp
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
-Serial RB control - Copyright (C) KI6ZUM 2015
-Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public
-License as published by the Free Software Foundation; either
-version 2 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with this library; if not, write to the
-Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
-Boston, MA  02110-1301, USA.
-*/
-
-#include "SerialRB.h"
-
-CSerialRB::CSerialRB(uint16_t length) :
-CRingBuffer<uint8_t>(length)
-{
-}
-
-uint8_t CSerialRB::get()
-{
-  uint8_t value;
-  if(CRingBuffer<uint8_t>::get(value))
-    return value;
-  
-  return 0U;
-}
-
diff --git a/SerialRB.h b/SerialRB.h
deleted file mode 100644
index 1357732..0000000
--- a/SerialRB.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
-Serial fifo control - Copyright (C) KI6ZUM 2015
-Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public
-License as published by the Free Software Foundation; either
-version 2 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with this library; if not, write to the
-Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
-Boston, MA  02110-1301, USA.
-*/
-
-#if !defined(SERIALRB_H)
-#define  SERIALRB_H
-
-#include "RingBuffer.h"
-
-const uint16_t SERIAL_RINGBUFFER_SIZE = 370U;
-
-class CSerialRB : public CRingBuffer<uint8_t>{
-public:
-  CSerialRB(uint16_t length = SERIAL_RINGBUFFER_SIZE);
-
-  uint8_t get();
-};
-
-#endif
-