diff --git a/IO_CMRI.h b/IO_CMRI.h
deleted file mode 100644
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--- a/IO_CMRI.h
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-/*
- *  © 2023, Neil McKechnie. All rights reserved.
- *  
- *  This file is part of DCC++EX API
- *
- *  This is free software: you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
- *  (at your option) any later version.
- *
- *  It 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 General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with CommandStation.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-/*
- * CMRIbus
- * =======
- * To define a CMRI bus, example syntax:
- *    CMRIbus::create(bus, serial, baud[, cycletime[, pin]]);
- * 
- * bus = 0-255
- * serial = serial port to be used (e.g. Serial3)
- * baud = baud rate (9600, 19200, 28800, 57600 or 115200)
- * cycletime = minimum time between successive updates/reads of a node in millisecs (default 500ms)
- * pin = pin number connected to RS485 module's DE and !RE terminals for half-duplex operation (default VPIN_NONE)
- * 
- * Each bus must use a different serial port.
- * 
- * IMPORTANT: If you are using ArduinoCMRI library code by Michael Adams, at the time of writing this library
- * is not compliant with the LCS-9.10.1 specification for CMRInet protocol.  
- * Various work-arounds may be enabled within the driver by adding the following line to your config.h file,
- * to allow nodes running the ArduinoCMRI library to communicate:
- * 
- *  #define ARDUINOCMRI_COMPATIBLE
- * 
- * CMRINode
- * ========
- * To define a CMRI node and associate it with a CMRI bus,
- *    CMRInode::create(firstVPIN, numVPINs, bus, nodeID, type [, inputs, outputs]);
- * 
- * firstVPIN = first vpin in block allocated to this device
- * numVPINs = number of vpins (e.g. 72 for an SMINI node)
- * bus = 0-255
- * nodeID = 0-127
- * type = 'M' for SMINI (fixed 24 inputs and 48 outputs)
- *        'C' for CPNODE (16 to 144 inputs/outputs in groups of 8)
- *        (other types are not supported at this time).
- * inputs = number of inputs (CPNODE only)
- * outputs = number of outputs (CPNODE only)
- * 
- * Reference: "LCS-9.10.1
- *             Layout Control Specification: CMRInet Protocol
- *             Version 1.1 December 2014."
- */
-
-#ifndef IO_CMRI_H
-#define IO_CMRI_H
-
-#include "IODevice.h"
-
-/**********************************************************************
- * CMRInode class
- * 
- * This encapsulates the state associated with a single CMRI node, 
- * which includes the nodeID type, number of inputs and outputs, and
- * the states of the inputs and outputs.
- **********************************************************************/
-class CMRInode : public IODevice {
-private:
-  uint8_t _busNo;
-  uint8_t _nodeID;
-  char _type;
-  CMRInode *_next = NULL;
-  uint8_t *_inputStates = NULL;
-  uint8_t *_outputStates = NULL;
-  uint16_t _numInputs = 0;
-  uint16_t _numOutputs = 0;
-  bool _initialised = false;
-
-public:
-  static void create(VPIN firstVpin, int nPins, uint8_t busNo, uint8_t nodeID, char type, uint16_t inputs=0, uint16_t outputs=0) {
-    if (checkNoOverlap(firstVpin, nPins)) new CMRInode(firstVpin, nPins, busNo, nodeID, type, inputs, outputs);
-  }
-  CMRInode(VPIN firstVpin, int nPins, uint8_t busNo, uint8_t nodeID, char type, uint16_t inputs=0, uint16_t outputs=0);
-
-  uint8_t getNodeID() {
-    return _nodeID;
-  }
-  CMRInode *getNext() {
-    return _next;
-  }
-  void setNext(CMRInode *node) {
-    _next = node;
-  }
-  bool isInitialised() {
-    return _initialised;
-  }
-  void setInitialised() {
-    _initialised = true;
-  }
-
-  void _begin() {
-    _initialised = false;
-  }
-
-  int _read(VPIN vpin) {
-    // Return current state from this device
-    uint16_t pin = vpin - _firstVpin;
-    if (pin < _numInputs) {
-      uint8_t mask = 1 << (pin & 0x7);
-      int index = pin / 8;
-      return (_inputStates[index] & mask) != 0;
-    } else
-      return 0;
-  }
-
-  void _write(VPIN vpin, int value) {
-    // Update current state for this device, in preparation the bus transmission
-    uint16_t pin = vpin - _firstVpin - _numInputs;
-    if (pin < _numOutputs) {
-      uint8_t mask = 1 << (pin & 0x7);
-      int index = pin / 8;
-      if (value)
-        _outputStates[index] |= mask;
-      else
-        _outputStates[index] &= ~mask;
-    }
-  }
-
-  void saveIncomingData(uint8_t index, uint8_t data) {
-    if (index < (_numInputs+7)/8)
-      _inputStates[index] = data;
-  }
-
-  uint8_t getOutputStates(uint8_t index) {
-    if (index < (_numOutputs+7)/8)
-      return _outputStates[index];
-    else
-      return 0;
-  }
-
-  uint16_t getNumInputs() {
-    return _numInputs;
-  }
-
-  uint16_t getNumOutputs() {
-    return _numOutputs;
-  }
-
-  char getType() {
-    return _type; 
-  }
-
-  uint8_t getBusNumber() {
-    return _busNo;
-  }
-
-  void _display() override {
-    DIAG(F("CMRInode type:'%c' configured on bus:%d nodeID:%d VPINs:%u-%u (in) %u-%u (out)"),
-      _type, _busNo, _nodeID, _firstVpin, _firstVpin+_numInputs-1,
-      _firstVpin+_numInputs, _firstVpin+_numInputs+_numOutputs-1);
-  }
-
-};
-
-/**********************************************************************
- * CMRIbus class
- * 
- * This encapsulates the properties state of the bus and the
- * transmission and reception of data across that bus.  Each CMRIbus
- * object owns a set of CMRInode objects which represent the nodes
- * attached to that bus.
- **********************************************************************/
-class CMRIbus : public IODevice {
-private:
-  // Here we define the device-specific variables.  
-  uint8_t _busNo;
-  HardwareSerial *_serial;
-  unsigned long _baud;
-  VPIN _transmitEnablePin = VPIN_NONE;
-  CMRInode *_nodeListStart = NULL, *_nodeListEnd = NULL;
-  CMRInode *_currentNode = NULL;
-
-  // Transmitter state machine states
-  enum {TD_IDLE, TD_PRETRANSMIT, TD_INIT, TD_TRANSMIT, TD_PROMPT, TD_RECEIVE};
-  uint8_t _transmitState = TD_IDLE;
-  // Receiver state machine states.
-  enum {RD_SYN1, RD_SYN2, RD_STX, RD_ADDR, RD_TYPE, 
-      RD_DATA, RD_ESCDATA, RD_SKIPDATA, RD_SKIPESCDATA, RD_ETX};
-  uint8_t _receiveState = RD_SYN1;
-  uint16_t _receiveDataIndex = 0;  // Index of next data byte to be received.
-  CMRIbus *_nextBus = NULL;  // Pointer to next bus instance in list.
-  unsigned long _cycleStartTime = 0;
-  unsigned long _timeoutStart = 0;
-  unsigned long _cycleTime; // target time between successive read/write cycles, microseconds
-  unsigned long _timeoutPeriod; // timeout on read responses, in microseconds.
-  unsigned long _currentMicros;  // last value of micros() from _loop function.
-  unsigned long _postDelay; // delay time after transmission before switching off transmitter (in us)
-  unsigned long _byteTransmitTime; // time in us for transmission of one byte
-
-  static CMRIbus *_busList; // linked list of defined bus instances
-
-  // Definition of special characters in CMRInet protocol
-  enum : uint8_t {
-    NUL = 0x00,
-    STX = 0x02,
-    ETX = 0x03,
-    DLE = 0x10,
-    SYN = 0xff,
-  };
-
-public:
-  static void create(uint8_t busNo, HardwareSerial &serial, unsigned long baud, uint16_t cycleTimeMS=500, VPIN transmitEnablePin=VPIN_NONE) {
-    new CMRIbus(busNo, serial, baud, cycleTimeMS, transmitEnablePin);
-  } 
-
-  // Device-specific initialisation
-  void _begin() override {
-    // CMRInet spec states one stop bit, JMRI and ArduinoCMRI use two stop bits
-#if defined(ARDUINOCMRI_COMPATIBLE)
-    _serial->begin(_baud, SERIAL_8N2);
-#else
-    _serial->begin(_baud, SERIAL_8N1);
-#endif
-  #if defined(DIAG_IO)
-    _display();
-  #endif
-  }
-
-  // Loop function (overriding IODevice::_loop(unsigned long))
-  void _loop(unsigned long currentMicros) override;
-
-  // Display information about the device
-  void _display() override {
-    DIAG(F("CMRIbus %d configured, speed=%d baud, cycle=%d ms"), _busNo, _baud, _cycleTime/1000);
-  }
-
-  // Locate CMRInode object with specified nodeID.
-  CMRInode *findNode(uint8_t nodeID) {
-    for (CMRInode *node = _nodeListStart; node != NULL; node = node->getNext()) {
-      if (node->getNodeID() == nodeID) 
-        return node;
-    }
-    return NULL;
-  }
-
-  // Add new CMRInode to the list of nodes for this bus.
-  void addNode(CMRInode *newNode) {
-    if (!_nodeListStart)
-      _nodeListStart = newNode;
-    if (!_nodeListEnd) 
-      _nodeListEnd = newNode;
-    else
-      _nodeListEnd->setNext(newNode);
-  DIAG(F("bus: 260h nodeID: _nodeListStart:%d _nodeListEnd:%d"), _nodeListStart, _nodeListEnd);
-  }
-
-protected:
-  CMRIbus(uint8_t busNo, HardwareSerial &serial, unsigned long baud, uint16_t cycleTimeMS, VPIN transmitEnablePin);
-  uint16_t sendData(CMRInode *node);
-  uint16_t requestData(CMRInode *node);
-  uint16_t sendInitialisation(CMRInode *node);
-
-  // Process any data bytes received from a CMRInode.
-  void processIncoming();
-  // Process any outgoing traffic that is due.
-  void processOutgoing();
-  // Enable transmitter
-  void enableTransmitter();
-  // Disable transmitter and enable receiver
-  void disableTransmitter();
-
-
-public:
-  uint8_t getBusNumber() {
-    return _busNo;
-  }
-
-  static CMRIbus *findBus(uint8_t busNo) {
-    for (CMRIbus *bus=_busList; bus!=NULL; bus=bus->_nextBus) {
-      if (bus->_busNo == busNo) return bus;
-    }
-    return NULL;
-  }
-};
-
-#endif // IO_CMRI_H