diff --git a/Makefile b/Makefile
index b86e4d1..ec73a3f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,7 @@
 ## Copyright © 2017 Project Golan, all rights reserved.
 GDCC_CC=gdcc-cc
 GDCC_LD=gdcc-ld
+GDCC_NTSC=gdcc-ntsc
 GDCC_MAKELIB=gdcc-makelib
 
 CFLAGS += -O2 -g -c
@@ -59,13 +60,16 @@ MISC_LIBOUTS=$(MISC_SOURCES:$(SRC)/%.c=$(BIN)/%.o)
 MAPS_SOURCES=$(wildcard $(MAPSRC)/*.gmf9)
 MAPS_OUTPUTS=$(MAPS_SOURCES:$(MAPSRC)/%.gmf9=$(MAPBIN)/%.gmf0)
 
+NTSC_SOURCES=$(SRC)/extmem.nts
+NTSC_BINARYS=$(CODEDEFS)/eikyo-extmem.bin
+
 LIBC_OUTPUTS=$(IR)/libc.ir $(IR)/libGDCC.ir
 LIBC_BINARYS=$(CODEDEFS)/stdlib.bin
 
 .PHONY: clean
 .SECONDARY: $(MISC_LIBOUTS)
 
-all: $(FOLDERS) $(GAME_BINARYS) $(INTR_BINARYS) $(MAIN_BINARYS) $(MFED_BINARYS) $(MISC_BINARYS) $(RNDR_BINARYS) $(LIBC_BINARYS) $(MAPS_OUTPUTS)
+all: $(FOLDERS) $(GAME_BINARYS) $(INTR_BINARYS) $(MAIN_BINARYS) $(MFED_BINARYS) $(MISC_BINARYS) $(RNDR_BINARYS) $(LIBC_BINARYS) $(MAPS_OUTPUTS) $(NTSC_BINARYS)
 
 $(GAME_BINARYS): $(GAME_OUTPUTS)
 $(GOL5_BINARYS): $(GOL5_OUTPUTS)
@@ -95,6 +99,9 @@ $(BIN)/%.o: $(SRC)/%.c $(MISC_HEADERS)
 %.bin:
 	$(GDCC_LD) $(GDCC_LFLAGS) -o $@ $^
 
+$(NTSC_BINARYS): $(NTSC_SOURCES)
+	$(GDCC_NTSC) -t CODEDEFS -o $@ $^
+
 $(IR)/%.ir: $(SRC)/%.c $(GAME_HEADERS) $(INTR_HEADERS) $(MISC_HEADERS) $(RNDR_HEADERS) $(STRH_BINARYS)
 	$(GDCC_CC) $(GDCC_CFLAGS) -DM_fileHash=$(shell bin/strh $<) -o $@ $<
 
diff --git a/src/extmem.nts b/src/extmem.nts
new file mode 100644
index 0000000..69a2505
--- /dev/null
+++ b/src/extmem.nts
@@ -0,0 +1 @@
+extmem Entity subtype 1;
diff --git a/src/g_object.c b/src/g_object.c
index 2c4c72b..a74fabe 100644
--- a/src/g_object.c
+++ b/src/g_object.c
@@ -16,7 +16,7 @@ void G_Entity_Create(G_mfdat *info)
 {
    G_entty const *type = G_ObjDef_GetType(info->ent.name);
 
-   DGE_Entity ent = {DGE_Entity_Create(type ? type->ext : 0)};
+   G_entit ent = {DGE_Entity_Create(type ? type->ext : 0)};
 
    ent.x = info->ent.x;
    ent.y = info->ent.y;
diff --git a/src/g_object.h b/src/g_object.h
index bf3757a..b3721fe 100644
--- a/src/g_object.h
+++ b/src/g_object.h
@@ -16,10 +16,18 @@
 #define G_Entity_propMem(ofs, t, name) \
    G_propMemExt(Entity, ofs, t, name)
 
-#define G_Entity_props() DGE_EntityProps()
+#define G_Entity_props() DGE_EntityProps() \
+   G_propMemOfs(DGE_OME(Entity.subtype), int, subtype)
 
 // Types ---------------------------------------------------------------------|
 
+enum G_subty
+{
+   subtype_none,
+   subtype_player,
+   subtype_max,
+};
+
 enum
 {
    G_Player_ammo,