diff --git a/Cart_Reader/NGP.ino b/Cart_Reader/NGP.ino
index cdc8380..3f26cfa 100644
--- a/Cart_Reader/NGP.ino
+++ b/Cart_Reader/NGP.ino
@@ -9,10 +9,10 @@ static const char ngpMenuItem1[] PROGMEM = "Read Rom";
 static const char ngpMenuItemReset[] PROGMEM = "Reset";
 static const char* const menuOptionsNGP[] PROGMEM = {ngpMenuItem1, ngpMenuItemReset};
 
-static const char ngpRomItem1[] PROGMEM = "4 Mbits";
-static const char ngpRomItem2[] PROGMEM = "8 Mbits";
-static const char ngpRomItem3[] PROGMEM = "16 Mbits";
-static const char ngpRomItem4[] PROGMEM = "32 Mbits";
+static const char ngpRomItem1[] PROGMEM = "4 Mbits / 512 KB";
+static const char ngpRomItem2[] PROGMEM = "8 Mbits / 1 MB";
+static const char ngpRomItem3[] PROGMEM = "16 Mbits / 2 MB";
+static const char ngpRomItem4[] PROGMEM = "32 Mbits / 4 MB";
 static const char* const ngpRomOptions[] PROGMEM = {ngpRomItem1, ngpRomItem2, ngpRomItem3, ngpRomItem4};
 
 char ngpRomVersion[3];
@@ -100,48 +100,21 @@ bool getCartInfo_NGP() {
   *(tmp + 1) = manufacturerID;
 
   switch (romSize) {
-    // detection error
-    case 0xffff:
-      return false;
-      break;
-    
-    // 4 Mbits
-    case 0x98ab:
-      cartSize = 524288;
-      break;
-    // Toshiba ?
-    case 0x204c:
-      cartSize = 524288;
-      break;      
-
-    // 8 Mbits
-    // Toshiba
-    case 0x982c:
-      cartSize = 1048576;
-      break;
-    // Samsung
-    case 0xec2c:
-      cartSize = 1048576;
-      break;
-
-    // 16 Mbits
-    // Toshiba
-    case 0x982f:
-      cartSize = 2097152;
-      break;
-    // Samsung
-    case 0xec2f:
-      cartSize = 2097152;
-      break;
+    case 0xffff: return false; break; // detection error (no cart inserted or hw problem)
+    case 0x98ab: cartSize = 524288; break; // 4 Mbits - Toshiba
+    case 0x204c: cartSize = 524288; break; // 4 Mbits - STMicroelectronics ?
+    case 0x982c: cartSize = 1048576; break; // 8 Mbits - Toshiba
+    case 0xec2c: cartSize = 1048576; break; // 8 Mbits - Samsung
+    case 0x982f: cartSize = 2097152; break; // 16 Mbits - Toshiba
+    case 0xec2f: cartSize = 2097152; break; // 16 Mbits - Samsung
   }
 
   // reset to read mode
   dataOut();
   writeByte_NGP(0x0, 0xf0);
 
-  dataIn();
-
   // confirm NGP cart recognition
+  dataIn();
   for (uint32_t addr = 0; addr < 28; addr++)
     sdBuffer[addr] = readByte_NGP(addr);
   if (memcmp_P(sdBuffer, PSTR("COPYRIGHT BY SNK CORPORATION"), 28) != 0 && memcmp_P(sdBuffer, PSTR(" LICENSED BY SNK CORPORATION"), 28) != 0)
@@ -150,7 +123,7 @@ bool getCartInfo_NGP() {
   // get app ID
   snprintf(cartID, 5, "%02X%02X", readByte_NGP(0x21), readByte_NGP(0x20));
   
-  // force rom size to 32Mbits for few titles
+  // force rom size to 32 Mbits for few titles
   if (strcmp(cartID,"0060") == 0 || strcmp(cartID,"0061") == 0 || strcmp(cartID,"0069") == 0 )
     cartSize = 4194304;
   
@@ -192,6 +165,7 @@ void printCartInfo_NGP() {
   print_Msg(F("Rom Size: "));
   if (cartSize == 0) {
     println_Msg(F("Unknown"));
+    // display the chip IDs if unknown
     print_Msg(F("Chip ID: "));
     println_Msg(String(manufacturerID,HEX) + " " + String(deviceID,HEX));
   }
@@ -217,22 +191,18 @@ void readROM_NGP(char *outPathBuf, size_t bufferSize) {
     // wait for user choice to come back from the question box menu
     switch (ngpRomMenu) {
       case 0:
-        // 4 Mbits
         cartSize = 524288;
         break;
 
       case 1:
-        // 8 Mbits
         cartSize = 1048576;
         break;
 
       case 2:
-        // 16 Mbits
         cartSize = 2097152;
         break;
 
       case 3:
-        // 32 Mbits
         cartSize = 4194304;
         break;
     }