diff --git a/I2CManager.cpp b/I2CManager.cpp
index d0d8550..a68d08d 100644
--- a/I2CManager.cpp
+++ b/I2CManager.cpp
@@ -48,6 +48,10 @@
 static const FSH * guessI2CDeviceType(uint8_t address) {
   if (address >= 0x20 && address <= 0x26)
     return F("GPIO Expander");
+#ifdef FAST_CLOCK_I2C
+  else if (address == FAST_CLOCK_I2C)
+    return F("Fast Clock");
+#endif
   else if (address == 0x27)
     return F("GPIO Expander or LCD Display");
   else if (address == 0x29)
@@ -363,4 +367,4 @@ void I2CAddress::toHex(const uint8_t value, char *buffer) {
 
 /* static */ bool I2CAddress::_addressWarningDone = false;
 
-#endif
\ No newline at end of file
+#endif
diff --git a/IODevice.cpp b/IODevice.cpp
index 2ed21b6..1155c85 100644
--- a/IODevice.cpp
+++ b/IODevice.cpp
@@ -27,6 +27,12 @@
 #include "IO_MCP23017.h"
 #include "DCCTimer.h"
 
+#if !defined(IO_NO_HAL)
+  #ifdef FAST_CLOCK_I2C
+    #include "IO_EXFastClock.h"  // FastClock driver
+  #endif
+#endif
+
 #if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_MEGAAVR)
 #define USE_FAST_IO
 #endif
@@ -75,6 +81,11 @@ void IODevice::begin() {
   } else {
     DIAG(F("Default PCA9685 at I2C 0x41 disabled due to configured user device"));
   }
+
+  #ifdef FAST_CLOCK_I2C
+    EXFastClock::create(FAST_CLOCK_I2C);
+    DIAG(F("EXFastClock::create"));
+  #endif
   
   // Predefine two MCP23017 module 0x20/0x21 if no conflicts
   // Allocates 32 pins 164-195
@@ -582,4 +593,3 @@ bool ArduinoPins::fastReadDigital(uint8_t pin) {
 #endif
   return result;
 }
-
diff --git a/IO_EXFastclock.h b/IO_EXFastclock.h
index 5ed237e..06d546f 100644
--- a/IO_EXFastclock.h
+++ b/IO_EXFastclock.h
@@ -56,12 +56,12 @@ static void create(I2CAddress i2cAddress) {
   // XXXX change thistosave2 bytes
   if (_checkforclock == 0) {
       FAST_CLOCK_EXISTS = true;
-      //DIAG(F("I2C Fast Clock found at %s"), i2cAddress.toString());
+      DIAG(F("I2C Fast Clock found at %s"), i2cAddress.toString());
       new EXFastClock(i2cAddress); 
     }
     else {
       FAST_CLOCK_EXISTS = false;
-      //DIAG(F("No Fast Clock found"));
+      DIAG(F("No Fast Clock found"));
       LCD(6,F("CLOCK NOT FOUND"));
     }