diff --git a/build/libraries/os/common/os_irqHandler.c b/build/libraries/os/common/os_irqHandler.c
index cd7f9be..66ee28d 100644
--- a/build/libraries/os/common/os_irqHandler.c
+++ b/build/libraries/os/common/os_irqHandler.c
@@ -125,7 +125,7 @@ asm void OS_IrqHandler( void )
         ldmia   r12, { r1-r2 }                  // r1: IE2, r2: IF2
         ands    r1, r1, r2                      // r1: IE2 & IF2
 
-        // if IE&IF==0 then return (without changing IF)
+        // if IE2&IF2==0 then return (without changing IF2)
 #ifdef  SDK_NO_THREAD
         bxeq    lr
 #else
diff --git a/include/nitro/hw/ARM7/mmap_global.h b/include/nitro/hw/ARM7/mmap_global.h
index 25186ec..0b5b1fd 100644
--- a/include/nitro/hw/ARM7/mmap_global.h
+++ b/include/nitro/hw/ARM7/mmap_global.h
@@ -91,6 +91,7 @@ extern "C" {
 
 //----------------------------- WRAM_AREA
 #define HW_WRAM_AREA            0x03000000
+#define HW_WRAM_AREA_HALF       (HW_WRAM_AREA+(HW_WRAM_AREA_SIZE/2))
 #define HW_WRAM_AREA_END        0x04000000
 #define HW_WRAM_AREA_SIZE       (HW_WRAM_AREA_END-HW_WRAM_AREA)
 
diff --git a/include/nitro/hw/ARM9/mmap_global.h b/include/nitro/hw/ARM9/mmap_global.h
index fdee7a8..bb2af4b 100644
--- a/include/nitro/hw/ARM9/mmap_global.h
+++ b/include/nitro/hw/ARM9/mmap_global.h
@@ -103,6 +103,7 @@ extern u32 SDK_AUTOLOAD_DTCM_START[];
 #define HW_MAIN_MEM_HI_EX_END   (HW_MAIN_MEM_HI + HW_MAIN_MEM_HI_EX_SIZE)
 //----------------------------- WRAM_AREA
 #define HW_WRAM_AREA            0x03000000
+#define HW_WRAM_AREA_HALF       (HW_WRAM_AREA+(HW_WRAM_AREA_SIZE/2))
 #define HW_WRAM_AREA_END        0x04000000
 #define HW_WRAM_AREA_SIZE       (HW_WRAM_AREA_END-HW_WRAM_AREA)
 //----------------------------- WRAMs
diff --git a/include/twl/mi/wram_abc.h b/include/twl/mi/wram_abc.h
index b522fb2..985fa7a 100644
--- a/include/twl/mi/wram_abc.h
+++ b/include/twl/mi/wram_abc.h
@@ -19,6 +19,13 @@
 
 #include <twl/ioreg.h>
 
+#ifdef	SDK_ARM9
+#include	<nitro/hw/ARM9/mmap_global.h>
+#else  //SDK_ARM7
+#include	<nitro/hw/ARM7/mmap_global.h>
+#endif
+
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -55,7 +62,7 @@ typedef enum
     MI_WRAM_A_OFS_0KB   = 0 << REG_MI_WRAM_A0_OFS_SHIFT,
     MI_WRAM_A_OFS_64KB  = 1 << REG_MI_WRAM_A0_OFS_SHIFT,
     MI_WRAM_A_OFS_128KB = 2 << REG_MI_WRAM_A0_OFS_SHIFT,
-    MI_WRAM_A_OFS_192KB = 1 << REG_MI_WRAM_A0_OFS_SHIFT
+    MI_WRAM_A_OFS_192KB = 3 << REG_MI_WRAM_A0_OFS_SHIFT
 }
 MIOfsWramA;
 
@@ -148,7 +155,22 @@ MIImageWramC;
 #endif // BROM_PLATFORM_TS
 
 
-#define MI_WRAM_MAP_NULL      HW_WRAM_AREA
+#define REG_WRAM_A_BNK_PACK( b_no, master, ofs, enable )  REG_WRAM_BNK_PACK( A, b_no, (master), (ofs), (enable) )
+#define REG_WRAM_B_BNK_PACK( b_no, master, ofs, enable )  REG_WRAM_BNK_PACK( B, b_no, (master), (ofs), (enable) )
+#define REG_WRAM_C_BNK_PACK( b_no, master, ofs, enable )  REG_WRAM_BNK_PACK( C, b_no, (master), (ofs), (enable) )
+#define REG_WRAM_BNK_PACK( abc, b_no, master, ofs, enable ) \
+( \
+    (((enable) != FALSE) * REG_MI_WRAM_##abc##b_no##_E_MASK) \
+  | (ofs) \
+  | (master) \
+)
+
+
+#define MI_WRAM_MAP_NULL        HW_WRAM_AREA
+
+#define REG_MI_WRAM_A_MAP_MAX   0x10000000
+#define REG_MI_WRAM_B_MAP_MAX   REG_MI_WRAM_A_MAP_MAX
+#define REG_MI_WRAM_C_MAP_MAX   REG_MI_WRAM_A_MAP_MAX
 
 #define REG_WRAM_A_MAP_PACK( start, end, img_size )  REG_WRAM_MAP_PACK( A, (start), (end), (img_size) )
 #define REG_WRAM_B_MAP_PACK( start, end, img_size )  REG_WRAM_MAP_PACK( B, (start), (end), (img_size) )