diff --git a/Debug.h b/Debug.h
index 599fbfd..aebe101 100644
--- a/Debug.h
+++ b/Debug.h
@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016,2017 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016,2017,2021 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -27,6 +27,7 @@
 #define  DEBUG3(a,b,c)      serial.writeDebug((a),(b),(c))
 #define  DEBUG4(a,b,c,d)    serial.writeDebug((a),(b),(c),(d))
 #define  DEBUG5(a,b,c,d,e)  serial.writeDebug((a),(b),(c),(d),(e))
+#define  DEBUG_DUMP(a,b)    serial.writeDebugDump((a),(b))
 
 #endif
 
diff --git a/SerialPort.cpp b/SerialPort.cpp
index 1a47d8e..021313e 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -94,6 +94,7 @@ const uint8_t MMDVM_DEBUG2       = 0xF2U;
 const uint8_t MMDVM_DEBUG3       = 0xF3U;
 const uint8_t MMDVM_DEBUG4       = 0xF4U;
 const uint8_t MMDVM_DEBUG5       = 0xF5U;
+const uint8_t MMDVM_DEBUG_DUMP   = 0xFAU;
 
 #if EXTERNAL_OSC == 12000000
 #define TCXO "12.0000 MHz"
@@ -2049,3 +2050,29 @@ void CSerialPort::writeDebug(const char* text, int16_t n1, int16_t n2, int16_t n
   writeInt(1U, reply, count, true);
 }
 
+void CSerialPort::writeDebugDump(const uint8_t* data, uint16_t length)
+{
+  uint8_t reply[512U];
+
+  reply[0U] = MMDVM_FRAME_START;
+
+  if (length > 252U) {
+    reply[1U] = 0U;
+    reply[2U] = (length + 4U) - 255U;
+    reply[3U] = MMDVM_DEBUG_DUMP;
+
+    for (uint8_t i = 0U; i < length; i++)
+      reply[i + 4U] = data[i];
+
+    writeInt(1U, reply, length + 4U);
+  } else {
+    reply[1U] = length + 3U;
+    reply[2U] = MMDVM_DEBUG_DUMP;
+
+    for (uint8_t i = 0U; i < length; i++)
+      reply[i + 3U] = data[i];
+
+    writeInt(1U, reply, length + 3U);
+  }
+}
+
diff --git a/SerialPort.h b/SerialPort.h
index c8f1733..26b26f7 100644
--- a/SerialPort.h
+++ b/SerialPort.h
@@ -97,6 +97,7 @@ public:
   void writeDebug(const char* text, int16_t n1, int16_t n2);
   void writeDebug(const char* text, int16_t n1, int16_t n2, int16_t n3);
   void writeDebug(const char* text, int16_t n1, int16_t n2, int16_t n3, int16_t n4);
+  void writeDebugDump(const uint8_t* data, uint16_t length);
 
 private:
   uint8_t   m_buffer[512U];