diff --git a/asm/region_map.s b/asm/region_map.s
index 3141d9a4f3..83687e02da 100644
--- a/asm/region_map.s
+++ b/asm/region_map.s
@@ -5,114 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_81230C4
-sub_81230C4: @ 81230C4
-	push {r4,lr}
-	movs r4, 0
-	ldr r2, =gUnknown_0203A144
-	ldr r0, [r2]
-	adds r0, 0x7B
-	strb r4, [r0]
-	ldr r0, [r2]
-	adds r0, 0x7C
-	strb r4, [r0]
-	ldr r3, =gMain
-	ldrh r1, [r3, 0x2C]
-	movs r0, 0x40
-	ands r0, r1
-	cmp r0, 0
-	beq _081230F6
-	ldr r1, [r2]
-	adds r0, r1, 0
-	adds r0, 0x56
-	ldrh r0, [r0]
-	cmp r0, 0x2
-	bls _081230F6
-	adds r1, 0x7C
-	movs r0, 0xFF
-	strb r0, [r1]
-	movs r4, 0x1
-_081230F6:
-	ldrh r1, [r3, 0x2C]
-	movs r0, 0x80
-	ands r0, r1
-	cmp r0, 0
-	beq _08123114
-	ldr r1, [r2]
-	adds r0, r1, 0
-	adds r0, 0x56
-	ldrh r0, [r0]
-	cmp r0, 0xF
-	bhi _08123114
-	adds r1, 0x7C
-	movs r0, 0x1
-	strb r0, [r1]
-	movs r4, 0x1
-_08123114:
-	ldrh r1, [r3, 0x2C]
-	movs r0, 0x20
-	ands r0, r1
-	cmp r0, 0
-	beq _08123132
-	ldr r1, [r2]
-	adds r0, r1, 0
-	adds r0, 0x54
-	ldrh r0, [r0]
-	cmp r0, 0x1
-	bls _08123132
-	adds r1, 0x7B
-	movs r0, 0xFF
-	strb r0, [r1]
-	movs r4, 0x1
-_08123132:
-	ldrh r1, [r3, 0x2C]
-	movs r0, 0x10
-	ands r0, r1
-	cmp r0, 0
-	beq _08123150
-	ldr r1, [r2]
-	adds r0, r1, 0
-	adds r0, 0x54
-	ldrh r0, [r0]
-	cmp r0, 0x1B
-	bhi _08123150
-	adds r1, 0x7B
-	movs r0, 0x1
-	strb r0, [r1]
-	movs r4, 0x1
-_08123150:
-	ldrh r3, [r3, 0x2E]
-	movs r0, 0x1
-	ands r0, r3
-	cmp r0, 0
-	beq _08123168
-	movs r4, 0x4
-	b _08123172
-	.pool
-_08123168:
-	movs r0, 0x2
-	ands r0, r3
-	cmp r0, 0
-	beq _08123172
-	movs r4, 0x5
-_08123172:
-	cmp r4, 0x1
-	bne _08123184
-	ldr r0, [r2]
-	adds r0, 0x7A
-	movs r1, 0x4
-	strb r1, [r0]
-	ldr r1, [r2]
-	ldr r0, =_swiopen
-	str r0, [r1, 0x18]
-_08123184:
-	adds r0, r4, 0
-	pop {r4}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_81230C4
-
 	thumb_func_start _swiopen
 _swiopen: @ 8123190
 	push {r4,r5,lr}
diff --git a/include/region_map.h b/include/region_map.h
index dfcfbc9138..79e217f1fa 100644
--- a/include/region_map.h
+++ b/include/region_map.h
@@ -250,10 +250,12 @@ struct RegionMap {
     /*0x076*/ u16 unk_076;
     /*0x078*/ u8 unk_078;
     /*0x079*/ u8 unk_079;
-    /*0x07a*/ u8 unk_07a;
-    /*0x07b*/ u8 filler_07b[3];
+    /*0x07a*/ s8 unk_07a;
+    /*0x07b*/ s8 unk_07b;
+    /*0x07c*/ u8 unk_07c;
+    /*0x07d*/ u8 unk_07d;
     /*0x07e*/ u8 unk_07e;
-    /*0x07f*/ u8 filler_07f[1];
+    /*0x07f*/ u8 unk_07f;
     /*0x080*/ u8 unk_080;
     /*0x081*/ u8 unk_081;
     /*0x082*/ u8 unk_082;
@@ -266,6 +268,8 @@ struct RegionMap {
 // Exported RAM declarations
 
 // Exported ROM declarations
+void sub_8122CF8(struct RegionMap *regionMap, struct UnkStruct_8122CF8 *arg1, bool8 arg2);
+bool8 sub_8122DB0(void);
 void GetMapName(u8 *, u16, u16);
 void sub_8122CDC(struct RegionMap *regionMap, u8 argument);
 void sub_8124288(u16 x, u16 y);
diff --git a/src/region_map.c b/src/region_map.c
index 714aa51ee7..7d3db9c8b1 100644
--- a/src/region_map.c
+++ b/src/region_map.c
@@ -1,6 +1,7 @@
 
 // Includes
 #include "global.h"
+#include "main.h"
 #include "region_map.h"
 #include "menu.h"
 #include "palette.h"
@@ -12,6 +13,17 @@ struct UnkStruct_0203A148 {
     u8 filler_000[0xa74];
 };
 
+enum
+{
+    INPUT_EVENT_NONE,
+    INPUT_EVENT_DPAD,
+    INPUT_EVENT_2,
+    INPUT_EVENT_3,
+    INPUT_EVENT_A_BUTTON,
+    INPUT_EVENT_B_BUTTON,
+};
+
+
 // Static RAM declarations
 
 EWRAM_DATA struct RegionMap *gUnknown_0203A144 = NULL;
@@ -19,16 +31,15 @@ EWRAM_DATA struct UnkStruct_0203A148 *gUnknown_0203A148 = NULL;
 
 // Static ROM declarations
 
-void sub_8122CF8(struct RegionMap *regionMap, struct UnkStruct_8122CF8 *arg1, bool8 arg2);
-bool8 sub_8122DB0(void);
-u8 sub_8123254(void);
 u8 sub_81230C4(void);
-void sub_81238AC(void);
-u16 sub_8123EB4(u16 mapSecId);
-u8 get_flagnr_blue_points(u16 mapSecId);
+u8 sub_8123254(void);
 void sub_81236C4(s32 a0, s32 a1, s32 a2, s32 a3, u16 a4, u16 a5, u16 a6);
-void sub_8123FB0(void);
 void sub_81237B4(void);
+void sub_81238AC(void);
+u8 get_flagnr_blue_points(u16 mapSecId);
+u16 sub_8123EB4(u16 mapSecId);
+void sub_8123FB0(void);
+u8 _swiopen(void);
 
 // .rodata
 
@@ -187,3 +198,46 @@ u8 sub_81230AC(void)
 {
     return gUnknown_0203A144->inputCallback();
 }
+
+u8 sub_81230C4(void)
+{
+    u8 input;
+
+    input = INPUT_EVENT_NONE;
+    gUnknown_0203A144->unk_07b = 0;
+    gUnknown_0203A144->unk_07c = 0;
+    if (gMain.heldKeys & DPAD_UP && gUnknown_0203A144->unk_056 > 2)
+    {
+        gUnknown_0203A144->unk_07c = -1;
+        input = INPUT_EVENT_DPAD;
+    }
+    if (gMain.heldKeys & DPAD_DOWN && gUnknown_0203A144->unk_056 < 16)
+    {
+        gUnknown_0203A144->unk_07c = +1;
+        input = INPUT_EVENT_DPAD;
+    }
+    if (gMain.heldKeys & DPAD_LEFT && gUnknown_0203A144->unk_054 > 1)
+    {
+        gUnknown_0203A144->unk_07b = -1;
+        input = INPUT_EVENT_DPAD;
+    }
+    if (gMain.heldKeys & DPAD_RIGHT && gUnknown_0203A144->unk_054 < 28)
+    {
+        gUnknown_0203A144->unk_07b = +1;
+        input = INPUT_EVENT_DPAD;
+    }
+    if (gMain.newKeys & A_BUTTON)
+    {
+        input = INPUT_EVENT_A_BUTTON;
+    }
+    else if (gMain.newKeys & B_BUTTON)
+    {
+        input = INPUT_EVENT_B_BUTTON;
+    }
+    if (input == INPUT_EVENT_DPAD)
+    {
+        gUnknown_0203A144->unk_07a = 4;
+        gUnknown_0203A144->inputCallback = _swiopen;
+    }
+    return input;
+}