diff --git a/DCCEXParser.cpp b/DCCEXParser.cpp
index cfb7219..2c3885a 100644
--- a/DCCEXParser.cpp
+++ b/DCCEXParser.cpp
@@ -578,7 +578,11 @@ bool DCCEXParser::parseZ(Print *stream, int16_t params, int16_t p[])
     }
         return true;
 
-    case 3: // <Z ID PIN INVERT>
+    case 3: // <Z ID PIN IFLAG>
+        if (p[0] < 0 ||
+	    p[1] > 255 || p[1] <= 1 || // Pins 0 and 1 are Serial to USB
+	    p[2] <   0 || p[2] > 7 )
+	  return false;
         if (!Output::create(p[0], p[1], p[2], 1))
           return false;
         StringFormatter::send(stream, F("<O>\n"));
diff --git a/EEStore.h b/EEStore.h
index aaecf4a..77136ae 100644
--- a/EEStore.h
+++ b/EEStore.h
@@ -33,9 +33,9 @@ extern ExternalEEPROM EEPROM;
 
 struct EEStoreData{
   char id[sizeof(EESTORE_ID)];
-  int nTurnouts;
-  int nSensors;  
-  int nOutputs;
+  uint16_t nTurnouts;
+  uint16_t nSensors;
+  uint16_t nOutputs;
 };
 
 struct EEStore{
diff --git a/Outputs.cpp b/Outputs.cpp
index b7aa7bc..52cafb8 100644
--- a/Outputs.cpp
+++ b/Outputs.cpp
@@ -100,14 +100,14 @@ void  Output::activate(int s){
 
 ///////////////////////////////////////////////////////////////////////////////
 
-Output* Output::get(int n){
+Output* Output::get(uint16_t n){
   Output *tt;
   for(tt=firstOutput;tt!=NULL && tt->data.id!=n;tt=tt->nextOutput);
   return(tt);
 }
 ///////////////////////////////////////////////////////////////////////////////
 
-bool Output::remove(int n){
+bool Output::remove(uint16_t n){
   Output *tt,*pp=NULL;
 
   for(tt=firstOutput;tt!=NULL && tt->data.id!=n;pp=tt,tt=tt->nextOutput);
@@ -127,17 +127,46 @@ bool Output::remove(int n){
 ///////////////////////////////////////////////////////////////////////////////
 
 void Output::load(){
-  struct OutputData data;
+  struct BrokenOutputData bdata;
   Output *tt;
+  bool isBroken=1;
 
-  for(int i=0;i<EEStore::eeStore->data.nOutputs;i++){
-    EEPROM.get(EEStore::pointer(),data);
-    tt=create(data.id,data.pin,data.iFlag);
-    tt->data.oStatus=bitRead(tt->data.iFlag,1)?bitRead(tt->data.iFlag,2):data.oStatus;      // restore status to EEPROM value is bit 1 of iFlag=0, otherwise set to value of bit 2 of iFlag
-    digitalWrite(tt->data.pin,tt->data.oStatus ^ bitRead(tt->data.iFlag,0));
-    pinMode(tt->data.pin,OUTPUT);
-    tt->num=EEStore::pointer();
-    EEStore::advance(sizeof(tt->data));
+  // This is a scary kluge. As we have two formats in EEPROM due to an
+  // earlier bug, we don't know which we encounter now. So we guess
+  // that if in all entries this byte has value of 7 or lower this is
+  // an iFlag and thus the broken format. Otherwise it would be a pin
+  // id. If someone uses only pins 0 to 7 of their arduino, they
+  // loose. This is (if you look at an arduino) however unlikely.
+
+  for(uint16_t i=0;i<EEStore::eeStore->data.nOutputs;i++){
+    EEPROM.get(EEStore::pointer()+ i*sizeof(struct BrokenOutputData),bdata);
+    if (bdata.iFlag > 7) { // it's a pin and not an iFlag!
+      isBroken=0;
+      break;
+    }
+  }
+  if ( isBroken ) {
+    for(uint16_t i=0;i<EEStore::eeStore->data.nOutputs;i++){
+      EEPROM.get(EEStore::pointer(),bdata);
+      tt=create(bdata.id,bdata.pin,bdata.iFlag);
+      tt->data.oStatus=bitRead(tt->data.iFlag,1)?bitRead(tt->data.iFlag,2):bdata.oStatus;      // restore status to EEPROM value is bit 1 of iFlag=0, otherwise set to value of bit 2 of iFlag
+      digitalWrite(tt->data.pin,tt->data.oStatus ^ bitRead(tt->data.iFlag,0));
+      pinMode(tt->data.pin,OUTPUT);
+      tt->num=EEStore::pointer();
+      EEStore::advance(sizeof(struct BrokenOutputData));
+    }
+  } else {
+    struct OutputData data;
+
+    for(uint16_t i=0;i<EEStore::eeStore->data.nOutputs;i++){
+      EEPROM.get(EEStore::pointer(),data);
+      tt=create(data.id,data.pin,data.iFlag);
+      tt->data.oStatus=bitRead(tt->data.iFlag,1)?bitRead(tt->data.iFlag,2):data.oStatus;      // restore status to EEPROM value is bit 1 of iFlag=0, otherwise set to value of bit 2 of iFlag
+      digitalWrite(tt->data.pin,tt->data.oStatus ^ bitRead(tt->data.iFlag,0));
+      pinMode(tt->data.pin,OUTPUT);
+      tt->num=EEStore::pointer();
+      EEStore::advance(sizeof(struct OutputData));
+    }
   }
 }
 
@@ -160,7 +189,7 @@ void Output::store(){
 }
 ///////////////////////////////////////////////////////////////////////////////
 
-Output *Output::create(int id, int pin, int iFlag, int v){
+Output *Output::create(uint16_t id, uint8_t pin, uint8_t iFlag, uint8_t v){
   Output *tt;
 
   if(firstOutput==NULL){
diff --git a/Outputs.h b/Outputs.h
index 319f704..6132102 100644
--- a/Outputs.h
+++ b/Outputs.h
@@ -23,25 +23,34 @@
 
 struct OutputData {
   uint8_t oStatus;
-  uint8_t id;
+  uint16_t id;
   uint8_t pin; 
   uint8_t iFlag; 
 };
 
+struct BrokenOutputData {
+  uint8_t oStatus;
+  uint8_t id;
+  uint8_t pin;
+  uint8_t iFlag;
+};
+
 class Output{
-  public:
+
+public:
   void activate(int s);
-  static Output* get(int);
-  static bool remove(int);
+  static Output* get(uint16_t);
+  static bool remove(uint16_t);
   static void load();
   static void store();
-  static Output *create(int, int, int, int=0);
+  static Output *create(uint16_t, uint8_t, uint8_t, uint8_t=0);
   static Output *firstOutput;
   struct OutputData data;
   Output *nextOutput;
   static void printAll(Print *);
-  private:
-  int num;  // Chris has no idea what this is all about!
+
+private:
+  int num;  // EEPROM pointer (Chris has no idea what this is all about!)
   
 }; // Output
   
diff --git a/Sensors.cpp b/Sensors.cpp
index d04f99e..33c3fd6 100644
--- a/Sensors.cpp
+++ b/Sensors.cpp
@@ -184,7 +184,7 @@ void Sensor::load(){
   struct SensorData data;
   Sensor *tt;
 
-  for(int i=0;i<EEStore::eeStore->data.nSensors;i++){
+  for(uint16_t i=0;i<EEStore::eeStore->data.nSensors;i++){
     EEPROM.get(EEStore::pointer(),data);
     tt=create(data.snum,data.pin,data.pullUp);
     EEStore::advance(sizeof(tt->data));
diff --git a/Turnouts.cpp b/Turnouts.cpp
index 677e746..4c46a68 100644
--- a/Turnouts.cpp
+++ b/Turnouts.cpp
@@ -103,7 +103,7 @@ void Turnout::load(){
   struct TurnoutData data;
   Turnout *tt;
 
-  for(int i=0;i<EEStore::eeStore->data.nTurnouts;i++){
+  for(uint16_t i=0;i<EEStore::eeStore->data.nTurnouts;i++){
     EEPROM.get(EEStore::pointer(),data);
     if (data.tStatus & STATUS_PWM) tt=create(data.id,data.tStatus & STATUS_PWMPIN, data.inactiveAngle,data.moveAngle);
     else tt=create(data.id,data.address,data.subAddress);
diff --git a/version.h b/version.h
index 074a09b..09211fa 100644
--- a/version.h
+++ b/version.h
@@ -3,8 +3,9 @@
 
 #include "StringFormatter.h"
 
-#define VERSION "3.1.5"
-// 3.1.6 Make output ID two bytes (reserved version number for that merge/branch)
+
+#define VERSION "3.1.6"
+// 3.1.6 Make output ID two bytes and guess format/size of registered outputs found in EEPROM
 // 3.1.5 Fix LCD corruption on power-up
 // 3.1.4 Refactor OLED and LCD drivers and remove unused code
 // 3.1.3 Add a loop delay to give more time for sensing an Ethernet cable connection