diff --git a/asm/ov00/ItemManager/ItemManager.s b/asm/ov00/ItemManager/ItemManager.s
index 485c7470..2e3c183b 100644
--- a/asm/ov00/ItemManager/ItemManager.s
+++ b/asm/ov00/ItemManager/ItemManager.s
@@ -3,103 +3,6 @@
 
 	.text
 
-	.global _ZN11ItemManager18func_ov00_020ad790Ej
-	arm_func_start _ZN11ItemManager18func_ov00_020ad790Ej
-_ZN11ItemManager18func_ov00_020ad790Ej: ; 0x020ad790
-	stmdb sp!, {r4, r5, r6, lr}
-	ldr r2, _020ad8c4 ; =data_027e0d38
-	mov r6, r0
-	ldr r0, [r2]
-	mov r5, r1
-	bl func_ov00_02078b40
-	cmp r0, #2
-	bne _020ad7c0
-	ldr r0, _020ad8c8 ; =data_027e10a4
-	ldr r0, [r0]
-	bl func_ov15_02136670
-	ldmia sp!, {r4, r5, r6, pc}
-_020ad7c0:
-	ldr r0, _020ad8c4 ; =data_027e0d38
-	ldr r0, [r0]
-	ldr r0, [r0, #0x14]
-	cmp r0, #1
-	moveq r0, #0
-	ldmeqia sp!, {r4, r5, r6, pc}
-	ldr r0, _020ad8cc ; =gOverlayManager
-	ldr r1, _020ad8d0 ; =0x0000001d
-	ldr r0, [r0, #0x18]
-	cmp r0, r1
-	bne _020ad800
-	ldr r0, _020ad8d4 ; =data_ov29_0217a4ac
-	ldrb r0, [r0, #0x54]
-	cmp r0, #0
-	movne r0, #0
-	ldmneia sp!, {r4, r5, r6, pc}
-_020ad800:
-	ldr r0, _020ad8d8 ; =data_027e0e60
-	ldr r4, [r6, #8]
-	ldr r0, [r0]
-	bl func_ov00_020849f8
-	cmp r0, #0
-	moveq r2, #1
-	ldr r1, [r6]
-	mvn r0, #0
-	movne r2, #0
-	cmp r1, r0
-	beq _020ad874
-	cmp r2, #0
-	bne _020ad840
-	sub r0, r1, #9
-	cmp r0, #1
-	bhi _020ad874
-_020ad840:
-	ldr r0, _020ad8dc ; =data_027e0fc8
-	ldr r0, [r0]
-	cmp r0, #0
-	beq _020ad860
-	mov r1, r5
-	bl func_ov00_020bbd80
-	cmp r0, #0
-	beq _020ad874
-_020ad860:
-	ldr r1, [r6]
-	mov r0, r6
-	bl _ZN11ItemManager7HasItemEj
-	cmp r0, #0
-	ldrne r4, [r6]
-_020ad874:
-	mvn r0, #0
-	cmp r4, r0
-	beq _020ad8bc
-	ldrh r0, [r6, #0x20]
-	cmp r0, #0
-	beq _020ad89c
-	cmp r5, #0
-	moveq r0, #1
-	movne r0, #0
-	ldmia sp!, {r4, r5, r6, pc}
-_020ad89c:
-	mov r0, r6
-	mov r1, r4
-	bl _ZN11ItemManager12GetEquipItemEj
-	ldr r2, [r0]
-	mov r1, r5
-	ldr r2, [r2, #0x14]
-	blx r2
-	ldmia sp!, {r4, r5, r6, pc}
-_020ad8bc:
-	mov r0, #0
-	ldmia sp!, {r4, r5, r6, pc}
-	.align 2, 0
-	arm_func_end _ZN11ItemManager18func_ov00_020ad790Ej
-_020ad8c4: .word data_027e0d38
-_020ad8c8: .word data_027e10a4
-_020ad8cc: .word gOverlayManager
-_020ad8d0: .word 0x0000001d
-_020ad8d4: .word data_ov29_0217a4ac
-_020ad8d8: .word data_027e0e60
-_020ad8dc: .word data_027e0fc8
-
 	.global _ZNK11ItemManager19GetEquippedShipPartEj
 	thumb_func_start _ZNK11ItemManager19GetEquippedShipPartEj
 _ZNK11ItemManager19GetEquippedShipPartEj: ; 0x020ad8e0
@@ -1625,7 +1528,7 @@ _ZN11ItemManager17EquipPreviousItemEv: ; 0x020ae3c0
 	bx ip
 	.align 2, 0
 	arm_func_end _ZN11ItemManager17EquipPreviousItemEv
-_020ae3cc: .word _ZN11ItemManager15SetEquippedItemEj
+_020ae3cc: .word _ZN11ItemManager15SetEquippedItemEj - 1
 
 	.global _ZN11ItemManager13ForceEquipItemEj
 	thumb_func_start _ZN11ItemManager13ForceEquipItemEj
diff --git a/asm/ov00/ItemManager/ItemManager_func_ov00_020ad790.inc b/asm/ov00/ItemManager/ItemManager_func_ov00_020ad790.inc
new file mode 100644
index 00000000..a1d98ad8
--- /dev/null
+++ b/asm/ov00/ItemManager/ItemManager_func_ov00_020ad790.inc
@@ -0,0 +1,85 @@
+
+	stmdb sp!, {r4, r5, r6, lr}
+    lda r2, data_027e0d38
+	mov r6, r0
+	ldr r0, [r2]
+	mov r5, r1
+	bl func_ov00_02078b40
+	cmp r0, #2
+	bne _020ad7c0
+	lda r0, data_027e10a4
+	ldr r0, [r0]
+	bl func_ov15_02136670
+	ldmia sp!, {r4, r5, r6, pc}
+_020ad7c0:
+    lda r0, data_027e0d38
+	ldr r0, [r0]
+	ldr r0, [r0, #0x14]
+	cmp r0, #1
+	moveq r0, #0
+	ldmeqia sp!, {r4, r5, r6, pc}
+	lda r0, gOverlayManager
+	ldconst r1, #0x1d
+	ldr r0, [r0, #0x18]
+	cmp r0, r1
+	bne _020ad800
+	lda r0, data_ov29_0217a4ac
+	ldrb r0, [r0, #0x54]
+	cmp r0, #0
+	movne r0, #0
+	ldmneia sp!, {r4, r5, r6, pc}
+_020ad800:
+	lda r0, data_027e0e60
+	ldr r4, [r6, #8]
+	ldr r0, [r0]
+	bl func_ov00_020849f8
+	cmp r0, #0
+	moveq r2, #1
+	ldr r1, [r6]
+	mvn r0, #0
+	movne r2, #0
+	cmp r1, r0
+	beq _020ad874
+	cmp r2, #0
+	bne _020ad840
+	sub r0, r1, #9
+	cmp r0, #1
+	bhi _020ad874
+_020ad840:
+	lda r0, data_027e0fc8
+	ldr r0, [r0]
+	cmp r0, #0
+	beq _020ad860
+	mov r1, r5
+	bl func_ov00_020bbd80
+	cmp r0, #0
+	beq _020ad874
+_020ad860:
+	ldr r1, [r6]
+	mov r0, r6
+	bl _ZN11ItemManager7HasItemEj
+	cmp r0, #0
+	ldrne r4, [r6]
+_020ad874:
+	mvn r0, #0
+	cmp r4, r0
+	beq _020ad8bc
+	ldrh r0, [r6, #0x20]
+	cmp r0, #0
+	beq _020ad89c
+	cmp r5, #0
+	moveq r0, #1
+	movne r0, #0
+	ldmia sp!, {r4, r5, r6, pc}
+_020ad89c:
+	mov r0, r6
+	mov r1, r4
+	bl _ZN11ItemManager12GetEquipItemEj
+	ldr r2, [r0]
+	mov r1, r5
+	ldr r2, [r2, #0x14]
+	blx r2
+	ldmia sp!, {r4, r5, r6, pc}
+_020ad8bc:
+	mov r0, #0
+	ldmia sp!, {r4, r5, r6, pc}
diff --git a/include/ItemManager.hpp b/include/ItemManager.hpp
index ee88540c..17e83728 100644
--- a/include/ItemManager.hpp
+++ b/include/ItemManager.hpp
@@ -254,7 +254,7 @@ public:
     bool EquipItem_vfunc_3c(Vec4p *param1, ItemFlag equipId);
     void EquipItem_vfunc_2c(ItemFlag equipId);
     EquipItem* GetEquipItem(ItemFlag equipId);
-    unk32 func_ov00_020ad790(unk32 param1);
+    bool func_ov00_020ad790(unk32 param1);
     bool SetEquippedItem(ItemFlag equipId);
     void EquipPreviousItem();
     void ForceEquipItem(ItemFlag equipId);
diff --git a/include/OverlayManager.hpp b/include/OverlayManager.hpp
index ce0a68fe..b3d3621d 100644
--- a/include/OverlayManager.hpp
+++ b/include/OverlayManager.hpp
@@ -88,9 +88,9 @@ enum OverlayIndex_ {
 };
 
 class OverlayManager {
+public:
     OverlayId mLoadedOverlays[OverlayIndex_COUNT];
 
-public:
     void Unload(OverlayIndex index);
     void Load(OverlayIndex index, OverlayId id);
     void LoadIfNotLoaded(OverlayIndex index, OverlayId id);
diff --git a/src/ItemManager.cpp b/src/ItemManager.cpp
index cafc7373..d8b71b76 100644
--- a/src/ItemManager.cpp
+++ b/src/ItemManager.cpp
@@ -263,3 +263,44 @@ ARM void ItemManager::GiveAmmo(ItemFlag equipId, u16 amount) {
     if ((*this->mAmmo)[equipId] <= this->GetMaxAmmo(equipId)) return;
     (*this->mAmmo)[equipId] = this->GetMaxAmmo(equipId);
 }
+
+extern "C" unk32 func_ov00_02078b40(UnkStruct_027e0d38 *param1);
+extern void *data_027e10a4;
+extern "C" bool func_ov15_02136670(void *param1);
+extern unk8 data_ov29_0217a4ac[];
+extern void *data_027e0e60;
+extern "C" bool func_ov00_020849f8(void *param1);
+extern unk32 data_027e0fc8;
+extern "C" bool func_ov00_020bbd80(unk32 param1, unk32 param2);
+extern "C" void _ZN11ItemManager12GetEquipItemEj();
+ARM NONMATCH bool ItemManager::func_ov00_020ad790(unk32 param1) {
+    #ifndef NONMATCHING
+    #include "../asm/ov00/ItemManager/ItemManager_func_ov00_020ad790.inc"
+    #else
+    unk32 unk1 = func_ov00_02078b40(data_027e0d38);
+    if (unk1 == 2) return func_ov15_02136670(data_027e10a4);
+    if (data_027e0d38->mUnk_14 == 1) return false;
+    // NONMATCH: OverlayId_29 should be in constant pool
+    if (gOverlayManager.mLoadedOverlays[OverlayIndex_6] == OverlayId_29 && data_ov29_0217a4ac[0x54] != 0) {
+        return false;
+    }
+    
+    ItemFlag equipId = this->mForcedItem;
+    bool unk2 = !func_ov00_020849f8(data_027e0e60);
+    if (
+        this->mEquippedItem != ItemFlag_None &&
+        (unk2 || this->mEquippedItem - 9 <= 1) &&
+        (data_027e0fc8 == 0 || func_ov00_020bbd80(data_027e0fc8, param1)) &&
+        this->HasItem(this->mEquippedItem)
+    ) {
+        equipId = this->mEquippedItem;
+    }
+    
+    if (equipId != ItemFlag_None) {
+        if (this->mEquipLoadTimer != 0) return param1 == 0;
+        return this->GetEquipItem(equipId)->IsUsable(param1);
+    }
+    return false;
+    #endif
+}
+