diff --git a/DCCEXParser.cpp b/DCCEXParser.cpp
index 429e1dc..e4b4d73 100644
--- a/DCCEXParser.cpp
+++ b/DCCEXParser.cpp
@@ -68,6 +68,8 @@ const int16_t HASH_KEYWORD_VPIN=-415;
 const int16_t HASH_KEYWORD_C=67;
 const int16_t HASH_KEYWORD_T=84;
 const int16_t HASH_KEYWORD_LCN = 15137;
+const int16_t HASH_KEYWORD_HAL = 10853;
+const int16_t HASH_KEYWORD_SHOW = -21309;
 #ifdef HAS_ENOUGH_MEMORY
 const int16_t HASH_KEYWORD_WIFI = -5583;
 const int16_t HASH_KEYWORD_ETHERNET = -30767;
@@ -874,6 +876,13 @@ bool DCCEXParser::parseD(Print *stream, int16_t params, int16_t p[])
         IODevice::writeAnalogue(p[1], p[2], params>3 ? p[3] : 0);
         break;
 
+#if !defined(IO_MINIMAL_HAL)
+    case HASH_KEYWORD_HAL: 
+        if (p[1] == HASH_KEYWORD_SHOW) 
+          IODevice::DumpAll();
+        break;
+#endif
+
     default: // invalid/unknown
         break;
     }
diff --git a/IO_DCCAccessory.cpp b/IO_DCCAccessory.cpp
index 139d900..7f3dd93 100644
--- a/IO_DCCAccessory.cpp
+++ b/IO_DCCAccessory.cpp
@@ -42,12 +42,9 @@ DCCAccessoryDecoder::DCCAccessoryDecoder(VPIN vpin, int nPins, int DCCAddress, i
 }
 
 void DCCAccessoryDecoder::_begin() {
-  int endAddress = _packedAddress + _nPins - 1;
-  int DCCAddress = _packedAddress >> 2;
-  int DCCSubaddress = _packedAddress & 3;
-  DIAG(F("DCC Accessory Decoder configured Vpins:%d-%d Linear Address:%d-%d (%d/%d-%d/%d)"), _firstVpin, _firstVpin+_nPins-1,
-      _packedAddress, _packedAddress+_nPins-1,
-     DCCAddress, DCCSubaddress, endAddress >> 2, endAddress % 4);
+#if defined(DIAG_IO)
+  _display();
+#endif
 }
 
 // Device-specific write function.
@@ -61,7 +58,7 @@ void DCCAccessoryDecoder::_write(VPIN id, int state) {
 
 void DCCAccessoryDecoder::_display() {
   int endAddress = _packedAddress + _nPins - 1;
-  DIAG(F("DCC Accessory Vpins:%d-%d Linear Address:%d-%d (%d/%d-%d/%d)"), _firstVpin, _firstVpin+_nPins-1,
+  DIAG(F("DCCAccessoryDecoder Configured on Vpins:%d-%d Linear Address:%d-%d (%d/%d-%d/%d)"), _firstVpin, _firstVpin+_nPins-1,
       _packedAddress, _packedAddress+_nPins-1,
       _packedAddress >> 2, _packedAddress % 4, endAddress >> 2, endAddress % 4);
 }
diff --git a/IO_ExampleSerial.cpp b/IO_ExampleSerial.cpp
index 6954e55..efcc3bf 100644
--- a/IO_ExampleSerial.cpp
+++ b/IO_ExampleSerial.cpp
@@ -42,7 +42,9 @@ void IO_ExampleSerial::create(VPIN firstVpin, int nPins, HardwareSerial *serial,
 // Device-specific initialisation
 void IO_ExampleSerial::_begin() {
   _serial->begin(_baud);
-  DIAG(F("ExampleSerial configured Vpins:%d-%d"), _firstVpin, _firstVpin+_nPins-1);
+#if defined(DIAG_IO)
+  _display();
+#endif
 
   // Send a few # characters to the output
   for (uint8_t i=0; i<3; i++)
@@ -121,7 +123,7 @@ void IO_ExampleSerial::_loop(unsigned long currentMicros) {
 }
 
 void IO_ExampleSerial::_display() {
-  DIAG(F("IO_ExampleSerial VPins:%d-%d"), (int)_firstVpin, 
+  DIAG(F("IO_ExampleSerial Configured on VPins:%d-%d"), (int)_firstVpin, 
     (int)_firstVpin+_nPins-1);
 }
 
diff --git a/IO_GPIOBase.h b/IO_GPIOBase.h
index 6e4a032..4ca8cce 100644
--- a/IO_GPIOBase.h
+++ b/IO_GPIOBase.h
@@ -99,7 +99,9 @@ void GPIOBase<T>::_begin() {
   I2CManager.begin();
   I2CManager.setClock(400000);
   if (I2CManager.exists(_I2CAddress)) {
+#if defined(DIAG_IO)
     _display();
+#endif
     _portMode = 0;  // default to input mode
     _portPullup = -1; // default to pullup enabled
     _portInputState = -1; 
diff --git a/IO_HCSR04.h b/IO_HCSR04.h
index e66c343..98340ff 100644
--- a/IO_HCSR04.h
+++ b/IO_HCSR04.h
@@ -90,8 +90,9 @@ protected:
     pinMode(_receivePin, INPUT);
     ArduinoPins::fastWriteDigital(_transmitPin, 0);
     _lastExecutionTime = micros();
-    DIAG(F("HCSR04 configured on VPIN:%d TXpin:%d RXpin:%d On:%dcm Off:%dcm"),
-      _firstVpin, _transmitPin, _receivePin, _onThreshold, _offThreshold);
+#if defined(DIAG_IO)
+    _display();
+#endif
   }
 
   // _read function - just return _value (calculated in _loop).
@@ -109,6 +110,11 @@ protected:
     }
   }
 
+  void _display() override {
+    DIAG(F("HCSR04 Configured on Vpin:%d TrigPin:%d EchoPin:%d On:%dcm Off:%dcm"),
+      _firstVpin, _transmitPin, _receivePin, _onThreshold, _offThreshold);
+  }
+
 private:
   // This polls the HC-SR04 device by sending a pulse and measuring the duration of
   //  the pulse observed on the receive pin.  In order to be kind to the rest of the CS