diff --git a/desmume/src/ARM9.h b/desmume/src/ARM9.h
new file mode 100644
index 000000000..c3e33b836
--- /dev/null
+++ b/desmume/src/ARM9.h
@@ -0,0 +1,29 @@
+#ifndef ARM9_H
+#define ARM9_H
+
+#include "../types.h"
+
+typedef struct {
+        //ARM9 mem
+        u8 ARM9_ITCM[0x8000];
+        u8 ARM9_DTCM[0x4000];
+        u8 ARM9_WRAM[0x1000000];
+        u8 MAIN_MEM[0x400000];
+        u8 ARM9_REG[0x1000000];
+        u8 ARM9_BIOS[0x8000];
+        u8 ARM9_VMEM[0x800];
+        u8 ARM9_ABG[0x80000];
+        u8 ARM9_BBG[0x20000];
+        u8 ARM9_AOBJ[0x40000];
+        u8 ARM9_BOBJ[0x20000];
+        u8 ARM9_LCD[0xA4000];
+        u8 ARM9_OAM[0x800];
+
+        u8 * ExtPal[2][4];
+        u8 * ObjExtPal[2][2];
+        u8 * texPalSlot[4];
+} ARM9_struct;
+
+extern ARM9_struct ARM9Mem;
+
+#endif