diff --git a/bsnes/snes/cartridge/cartridge.cpp b/bsnes/snes/cartridge/cartridge.cpp
index 1b5e40de..c207e1df 100644
--- a/bsnes/snes/cartridge/cartridge.cpp
+++ b/bsnes/snes/cartridge/cartridge.cpp
@@ -58,7 +58,6 @@ void Cartridge::load(Mode cartridge_mode, const lstring &xml_list) {
   has_msu1       = false;
   has_serial     = false;
   has_dos        = false;
-  dos_mapped     = false;
 
   parse_xml(xml_list);
 //print(xml_list[0], "\n\n");
diff --git a/bsnes/snes/cartridge/xml.cpp b/bsnes/snes/cartridge/xml.cpp
index f1ec026f..4ed8a74d 100644
--- a/bsnes/snes/cartridge/xml.cpp
+++ b/bsnes/snes/cartridge/xml.cpp
@@ -53,14 +53,6 @@ void Cartridge::parse_xml_cartridge(const char *data) {
       }
     }
   }
-
-  // set dos mapping here if no mapping given. Fix later?
-  if (!dos_mapped) {
-    has_dos = true;
-    dos_mapped = true;
-    bus.map(Bus::MapMode::Direct, 0x00, 0x3f, 0x5f00, 0x5fff, dos);
-    bus.map(Bus::MapMode::Direct, 0x80, 0xbf, 0x5f00, 0x5fff, dos);
-  }
 }
 
 void Cartridge::parse_xml_bsx(const char *data) {
@@ -571,7 +563,6 @@ void Cartridge::xml_parse_dos(xml_element& root) {
       foreach(attr, node.attribute) {
         if (attr.name == "address") {
           xml_parse_address(m, attr.content);
-          dos_mapped = true;
         }
       }
       mapping.append(m);
diff --git a/common/nall/snes/cartridge.hpp b/common/nall/snes/cartridge.hpp
index 255a94ec..a1b48c8e 100644
--- a/common/nall/snes/cartridge.hpp
+++ b/common/nall/snes/cartridge.hpp
@@ -96,6 +96,7 @@ class SNESCartridge {
   bool has_st010;
   bool has_st011;
   bool has_st018;
+  bool has_dos;
 };
 
 SNESCartridge::SNESCartridge(const uint8_t *data, unsigned size) {
@@ -508,6 +509,15 @@ SNESCartridge::SNESCartridge(const uint8_t *data, unsigned size) {
     xml << "  </setarisc>\n";
   }
 
+  // always set dos default mapping if none applied
+  has_dos = true;
+  if (has_dos) {
+    xml << "  <dos>\n";
+    xml << "    <map address='00-3f:5f00-5fff'/>\n";
+    xml << "    <map address='80-bf:5f00-5fff'/>\n";
+    xml << "  </dos>\n";
+  }
+
   xml << "</cartridge>\n";
   xmlMemoryMap = xml;
 }
@@ -532,6 +542,7 @@ void SNESCartridge::read_header(const uint8_t *data, unsigned size) {
   has_st010      = false;
   has_st011      = false;
   has_st018      = false;
+  has_dos        = false;
 
   //=====================
   //detect Game Boy carts