diff --git a/Cart_Reader/FLASH.ino b/Cart_Reader/FLASH.ino
index 3118053..893b78d 100644
--- a/Cart_Reader/FLASH.ino
+++ b/Cart_Reader/FLASH.ino
@@ -1,5 +1,6 @@
 //******************************************
 // FLASHROM MODULE
+// (also includes SNES repro functions)
 //******************************************
 
 #include "options.h"
@@ -16,7 +17,7 @@ unsigned long time;
 unsigned long blank;
 unsigned long sectorSize;
 uint16_t bufferSize;
-byte hiROM = 1;
+byte mapping = 1;
 
 /******************************************
    Menu
@@ -70,7 +71,7 @@ void flashMenu() {
     case 0:
       display_Clear();
       display_Update();
-      hiROM = 1;
+      mapping = 1;
       setup_Flash8();
       id_Flash8();
       wait();
@@ -745,23 +746,56 @@ void dataIn16() {
    Low level functions
  *****************************************/
 void writeByte_Flash(unsigned long myAddress, byte myData) {
+  // A0-A7
   PORTF = myAddress & 0xFF;
-  if (hiROM == 1) {
+
+  // standard for flash adapter and SNES HiRom
+  if (mapping == 1) {
+    // A8-A15
     PORTK = (myAddress >> 8) & 0xFF;
+    // A16-A23
     PORTL = (myAddress >> 16) & 0xFF;
   }
-  else if (hiROM == 0) {
+  // for SNES LoRom
+  else if (mapping == 0) {
+    // A8-A14
     PORTK = (myAddress >> 8) & 0x7F;
-    // Set A15(PK7) HIGH to disable SRAM
+    // Set SNES A15(PK7) HIGH to disable SRAM
     PORTK |= (1 << 7);
+    // A15-A22
     PORTL = (myAddress >> 15) & 0xFF;
   }
-  if (hiROM == 4) {
-    PORTK = (myAddress >> 8) & 0xFF;
-    PORTL = (myAddress >> 16) & 0xFF;
-    // Set A23(PL7) HIGH to enable high part of ExHiROM
-    PORTL |= (1 << 7);
+  // for SNES ExLoRom repro
+  else if (mapping == 2) {
+    // A8-A14
+    PORTK = (myAddress >> 8) & 0x7F;
+    // Set SNES A15(PK7) HIGH to disable SRAM
+    PORTK |= (1 << 7);
+    // A15-A22
+    PORTL = (myAddress >> 15) & 0xFF;
+    // Flip A22(PL7) to reverse P0 and P1 roms
+    PORTL ^= (1 << PL7);
   }
+  // for SNES ExHiRom repro
+  else if (mapping == 3) {
+    // A8-A15
+    PORTK = (myAddress >> 8) & 0xFF;
+    // A16-A22
+    PORTL = (myAddress >> 16) & 0xFF;
+    // Set PL7 to inverse of PL6 to reverse P0 and P1 roms
+    if (!(((myAddress >> 16) & 0xFF) & 0x40)) {
+      // if PL6 is 0 set PL7 to 1
+      PORTL |= (1 << 7);
+    }
+    else if (((myAddress >> 16) & 0xFF) & 0x40) {
+      // if PL6 is 1 set PL7 to 0
+      PORTL &= ~ (1 << 7);
+    }
+    // Switch SNES BA6(PL6) to HIGH to disable SRAM
+    PORTL |= (1 << 6);
+  }
+
+  // Data
   PORTC = myData;
 
   // Arduino running at 16Mhz -> one nop = 62.5ns
@@ -782,22 +816,53 @@ void writeByte_Flash(unsigned long myAddress, byte myData) {
 }
 
 byte readByte_Flash(unsigned long myAddress) {
+  // A0-A7
   PORTF = myAddress & 0xFF;
-  if (hiROM == 1) {
+
+  // standard for flash adapter and SNES HiRom
+  if (mapping == 1) {
+    // A8-A15
     PORTK = (myAddress >> 8) & 0xFF;
+    // A16-A23
     PORTL = (myAddress >> 16) & 0xFF;
   }
-  else if (hiROM == 0) {
+  // for SNES LoRom
+  else if (mapping == 0) {
+    // A8-A14
     PORTK = (myAddress >> 8) & 0x7F;
-    // Set A15(PK7) HIGH to disable SRAM
+    // Set SNES A15(PK7) HIGH to disable SRAM
     PORTK |= (1 << 7);
+    // A15-A22
     PORTL = (myAddress >> 15) & 0xFF;
   }
-  else if (hiROM == 4) {
+  // for SNES ExLoRom repro
+  else if (mapping == 2) {
+    // A8-A14
+    PORTK = (myAddress >> 8) & 0x7F;
+    // Set SNES A15(PK7) HIGH to disable SRAM
+    PORTK |= (1 << 7);
+    // A15-A22
+    PORTL = (myAddress >> 15) & 0xFF;
+    // Flip A22(PL7) to reverse P0 and P1 roms
+    PORTL ^= (1 << PL7);
+  }
+  // for SNES ExHiRom repro
+  else if (mapping == 3) {
+    // A8-A15
     PORTK = (myAddress >> 8) & 0xFF;
+    // A16-A22
     PORTL = (myAddress >> 16) & 0xFF;
-    // Set A23(PL7) HIGH to enable high part of ExHiROM
-    PORTL |= (1 << 7);
+    // Set PL7 to inverse of PL6 to reverse P0 and P1 roms
+    if (!(((myAddress >> 16) & 0xFF) & 0x40)) {
+      // if PL6 is 0 set PL7 to 1
+      PORTL |= (1 << 7);
+    }
+    else if (((myAddress >> 16) & 0xFF) & 0x40) {
+      // if PL6 is 1 set PL7 to 0
+      PORTL &= ~ (1 << 7);
+    }
+    // Switch SNES BA6(PL6) to HIGH to disable SRAM
+    PORTL |= (1 << 6);
   }
 
   // Arduino running at 16Mhz -> one nop = 62.5ns
diff --git a/Cart_Reader/GBM.ino b/Cart_Reader/GBM.ino
index 066afaf..24dcbbf 100644
--- a/Cart_Reader/GBM.ino
+++ b/Cart_Reader/GBM.ino
@@ -1,6 +1,6 @@
-/******************************************
-  GB MEMORY MODULE
-******************************************/
+//******************************************
+// GB MEMORY MODULE
+//******************************************
 
 #include "options.h"
 #ifdef enable_GBX
diff --git a/Cart_Reader/SNES.ino b/Cart_Reader/SNES.ino
index a2b93fc..2f9c75a 100644
--- a/Cart_Reader/SNES.ino
+++ b/Cart_Reader/SNES.ino
@@ -58,28 +58,30 @@ static const char confMenuItem5[] PROGMEM = "Reset";
 static const char* const menuOptionsConfManual[] PROGMEM = {confMenuItem1, confMenuItem2, confMenuItem3, confMenuItem4, confMenuItem5};
 
 // Repro menu items
-static const char reproMenuItem1[] PROGMEM = "LoROM repro";
-static const char reproMenuItem2[] PROGMEM = "HiROM repro P0";
-static const char reproMenuItem3[] PROGMEM = "HiROM repro P1";
-static const char reproMenuItem4[] PROGMEM = "Reset";
-static const char* const menuOptionsRepro[] PROGMEM = {reproMenuItem1, reproMenuItem2, reproMenuItem3, reproMenuItem4};
+static const char reproMenuItem1[] PROGMEM = "LoRom (P0)";
+static const char reproMenuItem2[] PROGMEM = "HiRom (P0)";
+static const char reproMenuItem3[] PROGMEM = "ExLoRom (P1)";
+static const char reproMenuItem4[] PROGMEM = "ExHiRom (P1)";
+static const char reproMenuItem5[] PROGMEM = "Reset";
+static const char* const menuOptionsRepro[] PROGMEM = {reproMenuItem1, reproMenuItem2, reproMenuItem3, reproMenuItem4, reproMenuItem5};
 
 // SNES repro menu
 void reproMenu() {
   // create menu with title and 6 options to choose from
   unsigned char snsRepro;
   // Copy menuOptions out of progmem
-  convertPgm(menuOptionsRepro, 4);
-  snsRepro = question_box(F("Select Repro Type"), menuOptions, 4, 0);
+  convertPgm(menuOptionsRepro, 5);
+  snsRepro = question_box(F("Select Repro Type"), menuOptions, 5, 0);
 
   // wait for user choice to come back from the question box menu
   switch (snsRepro)
   {
 #ifdef enable_FLASH
     case 0:
+      // LoRom
       display_Clear();
       display_Update();
-      hiROM = 0;
+      mapping = 0;
       setup_Flash8();
       id_Flash8();
       wait();
@@ -87,9 +89,10 @@ void reproMenu() {
       break;
 
     case 1:
+      // HiRom
       display_Clear();
       display_Update();
-      hiROM = 1;
+      mapping = 1;
       setup_Flash8();
       id_Flash8();
       wait();
@@ -97,9 +100,21 @@ void reproMenu() {
       break;
 
     case 2:
+      // ExLoRom
       display_Clear();
       display_Update();
-      hiROM = 4;
+      mapping = 2;
+      setup_Flash8();
+      id_Flash8();
+      wait();
+      mode = mode_FLASH8;
+      break;
+
+    case 3:
+      // ExHiRom
+      display_Clear();
+      display_Update();
+      mapping = 3;
       setup_Flash8();
       id_Flash8();
       wait();
@@ -107,7 +122,7 @@ void reproMenu() {
       break;
 #endif
 
-    case 3:
+    case 4:
       resetArduino();
       break;
   }
diff --git a/Cart_Reader/options.h b/Cart_Reader/options.h
index 6b24256..9d3ed6e 100644
--- a/Cart_Reader/options.h
+++ b/Cart_Reader/options.h
@@ -1,6 +1,6 @@
-/******************************************
-   Options
-******************************************/
+//******************************************
+// OPTIONS
+//******************************************
 // Change mainMenu to snsMenu, mdMenu, n64Menu, gbxMenu, pcsMenu,
 // flashMenu, nesMenu or smsMenu for single slot Cart Readers
 #define startMenu mainMenu