diff --git a/Cart_Reader/7800.ino b/Cart_Reader/7800.ino
index d2b454b..383eb5f 100644
--- a/Cart_Reader/7800.ino
+++ b/Cart_Reader/7800.ino
@@ -613,7 +613,7 @@ setrom:
 void checkStatus_7800() {
   EEPROM_readAnything(7, a7800mapper);
   EEPROM_readAnything(8, a7800size);
-  if (a7800mapper > 6) {
+  if (a7800mapper > 7) {
     a7800mapper = 0;  // default
     EEPROM_writeAnything(7, a7800mapper);
   }
@@ -862,4 +862,4 @@ void setCart_7800() {
     print_FatalError(F("Database file not found"));
   }
 }
-#endif
\ No newline at end of file
+#endif