diff --git a/Makefile b/Makefile
index f32eb17a2b..1a79bef8fe 100644
--- a/Makefile
+++ b/Makefile
@@ -425,7 +425,8 @@ $(BUILD_DIR)/src/boot/sleep.o: OPTFLAGS := -O2
 $(BUILD_DIR)/src/boot/sprintf.o: OPTFLAGS := -O2
 $(BUILD_DIR)/src/boot/stackcheck.o: OPTFLAGS := -O2
 
-$(BUILD_DIR)/src/code/__osMalloc.o: OPTFLAGS := -O2
+$(BUILD_DIR)/src/code/__osMalloc_n64.o: OPTFLAGS := -O2
+$(BUILD_DIR)/src/code/__osMalloc_gc.o: OPTFLAGS := -O2
 $(BUILD_DIR)/src/code/code_800FC620.o: OPTFLAGS := -O2
 $(BUILD_DIR)/src/code/fp_math.o: OPTFLAGS := -O2
 $(BUILD_DIR)/src/code/rand.o: OPTFLAGS := -O2
diff --git a/include/fault.h b/include/fault.h
index 4ecb17aea0..ac63a234db 100644
--- a/include/fault.h
+++ b/include/fault.h
@@ -4,9 +4,8 @@
 #include "ultra64.h"
 #include "attributes.h"
 #include "padmgr.h"
-#include "versions.h"
 
-#if FAULT_VERSION == FAULT_GC
+#if PLATFORM_GC
 // These are the same as the 3-bit ansi color codes
 #define FAULT_COLOR_BLACK      0
 #define FAULT_COLOR_RED        1
@@ -34,7 +33,7 @@ typedef struct FaultClient {
     /* 0x0C */ void* arg1;
 } FaultClient; // size = 0x10
 
-#if FAULT_VERSION == FAULT_GC
+#if PLATFORM_GC
 typedef struct FaultAddrConvClient {
     /* 0x00 */ struct FaultAddrConvClient* next;
     /* 0x04 */ void* callback;
@@ -56,7 +55,7 @@ NORETURN void Fault_AddHungupAndCrash(const char* file, int line);
 void Fault_AddClient(FaultClient* client, void* callback, void* arg0, void* arg1);
 void Fault_RemoveClient(FaultClient* client);
 
-#if FAULT_VERSION == FAULT_GC
+#if PLATFORM_GC
 void Fault_AddAddrConvClient(FaultAddrConvClient* client, void* callback, void* arg);
 void Fault_RemoveAddrConvClient(FaultAddrConvClient* client);
 #endif
@@ -71,13 +70,13 @@ void Fault_SetCursor(s32 x, s32 y);
 s32 Fault_Printf(const char* fmt, ...);
 void Fault_DrawText(s32 x, s32 y, const char* fmt, ...);
 
-#if FAULT_VERSION == FAULT_N64
+#if PLATFORM_N64
 
 // Not implemented. Silently noop-ing is fine, these are not essential for functionality.
 #define Fault_SetFontColor(color) (void)0
 #define Fault_SetCharPad(padW, padH) (void)0
 
-#elif FAULT_VERSION == FAULT_GC
+#else
 
 void Fault_InitDrawer(void);
 void Fault_SetForeColor(u16 color);
@@ -88,13 +87,13 @@ s32 Fault_VPrintf(const char* fmt, va_list args);
 
 #endif
 
-#if FAULT_VERSION == FAULT_N64
+#if PLATFORM_N64
 
 extern vs32 gFaultMsgId;
 
 #define FAULT_MSG_ID gFaultMsgId
 
-#elif FAULT_VERSION == FAULT_GC
+#else
 
 typedef struct FaultMgr {
     /* 0x000 */ OSThread thread;
diff --git a/include/functions.h b/include/functions.h
index 7ca8a2ae27..6ad09a447c 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -862,7 +862,7 @@ void ZeldaArena_GetSizes(u32* outMaxFree, u32* outFree, u32* outAlloc);
 void ZeldaArena_Check(void);
 void ZeldaArena_Init(void* start, u32 size);
 void ZeldaArena_Cleanup(void);
-u8 ZeldaArena_IsInitialized(void);
+s32 ZeldaArena_IsInitialized(void);
 #if OOT_DEBUG
 void ZeldaArena_CheckPointer(void* ptr, u32 size, const char* name, const char* action);
 void* ZeldaArena_MallocDebug(u32 size, const char* file, int line);
@@ -1323,7 +1323,7 @@ void DebugArena_GetSizes(u32* outMaxFree, u32* outFree, u32* outAlloc);
 void DebugArena_Check(void);
 void DebugArena_Init(void* start, u32 size);
 void DebugArena_Cleanup(void);
-u8 DebugArena_IsInitialized(void);
+s32 DebugArena_IsInitialized(void);
 #if OOT_DEBUG
 void DebugArena_CheckPointer(void* ptr, u32 size, const char* name, const char* action);
 void* DebugArena_MallocDebug(u32 size, const char* file, int line);
@@ -1593,7 +1593,7 @@ void SystemArena_GetSizes(u32* outMaxFree, u32* outFree, u32* outAlloc);
 void SystemArena_Check(void);
 void SystemArena_Init(void* start, u32 size);
 void SystemArena_Cleanup(void);
-u8 SystemArena_IsInitialized(void);
+s32 SystemArena_IsInitialized(void);
 #if OOT_DEBUG
 void* SystemArena_MallocDebug(u32 size, const char* file, int line);
 void* SystemArena_MallocRDebug(u32 size, const char* file, int line);
@@ -1601,24 +1601,6 @@ void* SystemArena_ReallocDebug(void* ptr, u32 newSize, const char* file, int lin
 void SystemArena_FreeDebug(void* ptr, const char* file, int line);
 void SystemArena_Display(void);
 #endif
-
-void __osMallocInit(Arena* arena, void* start, u32 size);
-void __osMallocAddBlock(Arena* arena, void* start, s32 size);
-void __osMallocCleanup(Arena* arena);
-u8 __osMallocIsInitialized(Arena* arena);
-void* __osMalloc(Arena* arena, u32 size);
-void* __osMallocR(Arena* arena, u32 size);
-void __osFree(Arena* arena, void* ptr);
-void* __osRealloc(Arena* arena, void* ptr, u32 newSize);
-void ArenaImpl_GetSizes(Arena* arena, u32* outMaxFree, u32* outFree, u32* outAlloc);
-u32 __osCheckArena(Arena* arena);
-#if OOT_DEBUG
-void* __osMallocDebug(Arena* arena, u32 size, const char* file, int line);
-void* __osMallocRDebug(Arena* arena, u32 size, const char* file, int line);
-void __osFreeDebug(Arena* arena, void* ptr, const char* file, int line);
-void* __osReallocDebug(Arena* arena, void* ptr, u32 newSize, const char* file, int line);
-void __osDisplayArena(Arena* arena);
-#endif
 s32 PrintUtils_VPrintf(PrintCallback* pfn, const char* fmt, va_list args);
 s32 PrintUtils_Printf(PrintCallback* pfn, const char* fmt, ...);
 void Sleep_Cycles(OSTime cycles);
diff --git a/include/padmgr.h b/include/padmgr.h
index efd245c7d5..7078c90078 100644
--- a/include/padmgr.h
+++ b/include/padmgr.h
@@ -53,7 +53,7 @@ void PadMgr_Init(PadMgr* padMgr, OSMesgQueue* serialEventQueue, IrqMgr* irqMgr,
 
 // This function cannot be prototyped here in all configurations because it is called incorrectly in fault_gc.c
 // (see bug in `Fault_PadCallback`)
-#if FAULT_VERSION == FAULT_N64 || defined(AVOID_UB)
+#if PLATFORM_N64 || defined(AVOID_UB)
 void PadMgr_RequestPadData(PadMgr* padmgr, Input* inputs, s32 gameRequest);
 #endif
 
diff --git a/include/rand.h b/include/rand.h
index a1a6a7c165..79ced24ea1 100644
--- a/include/rand.h
+++ b/include/rand.h
@@ -2,7 +2,6 @@
 #define RAND_H
 
 #include "ultra64.h"
-#include "versions.h"
 
 u32 Rand_Next(void);
 void Rand_Seed(u32 seed);
@@ -11,7 +10,7 @@ void Rand_Seed_Variable(u32* rndNum, u32 seed);
 u32 Rand_Next_Variable(u32* rndNum);
 f32 Rand_ZeroOne_Variable(u32* rndNum);
 
-#if RAND_VERSION == RAND_GC
+#if PLATFORM_GC
 f32 Rand_Centered(void);
 f32 Rand_Centered_Variable(u32* rndNum);
 #endif
diff --git a/include/variables.h b/include/variables.h
index 739a768185..fa09f0f54f 100644
--- a/include/variables.h
+++ b/include/variables.h
@@ -2,6 +2,7 @@
 #define VARIABLES_H
 
 #include "z64.h"
+#include "osMalloc.h"
 #include "segment_symbols.h"
 
 extern Mtx D_01000000;
@@ -234,7 +235,6 @@ extern ActiveSequence gActiveSeqs[4];
 extern AudioContext gAudioCtx;
 extern AudioCustomUpdateFunction gAudioCustomUpdateFunction;
 
-extern u32 __osMalloc_FreeBlockTest_Enable;
 extern Arena gSystemArena;
 extern OSPifRam __osContPifRam;
 extern u8 __osContLastCmd;
@@ -248,6 +248,4 @@ extern u64 gGfxSPTaskStack[SP_DRAM_STACK_SIZE64]; // 0x400 bytes
 extern GfxPool gGfxPools[2]; // 0x24820 bytes
 extern u8 gAudioHeap[0x38000]; // 0x38000 bytes
 
-extern u32 gTotalAllocFailures;
-
 #endif
diff --git a/include/versions.h b/include/versions.h
index 1112ac01f7..b135ae390c 100644
--- a/include/versions.h
+++ b/include/versions.h
@@ -16,20 +16,4 @@
 #define GC_EU_MQ      12
 #define GC_JP_CE      13
 
-#define FAULT_N64 1 // in OoT N64
-#define FAULT_GC 2  // in OoT GC
-#if PLATFORM_N64
-#define FAULT_VERSION FAULT_N64
-#else
-#define FAULT_VERSION FAULT_GC
-#endif
-
-#define RAND_N64 1 // in OoT N64
-#define RAND_GC 2  // in OoT GC
-#if PLATFORM_N64
-#define RAND_VERSION RAND_N64
-#else
-#define RAND_VERSION RAND_GC
-#endif
-
 #endif
diff --git a/include/z64.h b/include/z64.h
index 6b6cfb284a..02cdafb49a 100644
--- a/include/z64.h
+++ b/include/z64.h
@@ -439,33 +439,6 @@ typedef struct Yaz0Header {
     /* 0x0C */ u32 uncompDataOffset; // only used in mio0
 } Yaz0Header; // size = 0x10
 
-struct ArenaNode;
-
-typedef struct Arena {
-    /* 0x00 */ struct ArenaNode* head;
-    /* 0x04 */ void* start;
-    /* 0x08 */ OSMesgQueue lockQueue;
-    /* 0x20 */ u8 allocFailures; // only used in non-debug builds
-    /* 0x21 */ u8 isInit;
-    /* 0x22 */ u8 flag;
-} Arena; // size = 0x24
-
-typedef struct ArenaNode {
-    /* 0x00 */ s16 magic;
-    /* 0x02 */ s16 isFree;
-    /* 0x04 */ u32 size;
-    /* 0x08 */ struct ArenaNode* next;
-    /* 0x0C */ struct ArenaNode* prev;
-#if OOT_DEBUG // TODO: This debug info is also present in N64 retail builds
-    /* 0x10 */ const char* filename;
-    /* 0x14 */ int line;
-    /* 0x18 */ OSId threadId;
-    /* 0x1C */ Arena* arena;
-    /* 0x20 */ OSTime time;
-    /* 0x28 */ u8 unk_28[0x30-0x28]; // probably padding
-#endif
-} ArenaNode; // size = 0x30
-
 /* Relocation entry field getters */
 #define RELOC_SECTION(reloc)   ((reloc) >> 30)
 #define RELOC_OFFSET(reloc)    ((reloc) & 0xFFFFFF)
diff --git a/osMalloc.h b/osMalloc.h
new file mode 100644
index 0000000000..5fb8dd8e4d
--- /dev/null
+++ b/osMalloc.h
@@ -0,0 +1,72 @@
+#ifndef OSMALLOC_H
+#define OSMALLOC_H
+
+#include "ultra64.h"
+
+struct ArenaNode;
+
+typedef struct Arena {
+    /* 0x00 */ struct ArenaNode* head;
+    /* 0x04 */ void* start;
+#if PLATFORM_N64
+    /* 0x08 */ u32 size;
+    /* 0x0C */ u8 allocFailures;
+#else
+    /* 0x08 */ OSMesgQueue lockQueue;
+    /* 0x20 */ u8 allocFailures; // only used in non-debug builds
+    /* 0x21 */ u8 isInit;
+    /* 0x22 */ u8 flag;
+#endif
+} Arena; // size = 0x10 (N64), size = 0x24 (GC)
+
+typedef struct ArenaNode {
+    /* 0x00 */ s16 magic;
+    /* 0x02 */ s16 isFree;
+    /* 0x04 */ u32 size;
+    /* 0x08 */ struct ArenaNode* next;
+    /* 0x0C */ struct ArenaNode* prev;
+#if PLATFORM_N64 || OOT_DEBUG
+    /* 0x10 */ const char* filename;
+    /* 0x14 */ int line;
+    /* 0x18 */ OSId threadId;
+    /* 0x1C */ Arena* arena;
+    /* 0x20 */ OSTime time;
+    /* 0x28 */ u8 unk_28[0x30-0x28]; // probably padding
+#endif
+} ArenaNode; // size = 0x30 (N64 and GC debug), size = 0x10 (GC retail)
+
+#if PLATFORM_N64
+#define DECLARE_INTERRUPT_MASK OSIntMask __mask;
+#define CLEAR_INTERRUPTS() __mask = osSetIntMask(OS_IM_NONE)
+#define DISABLE_INTERRUPTS() __mask = osSetIntMask(OS_IM_NONE)
+#define RESTORE_INTERRUPTS() osSetIntMask(__mask)
+#else
+#define DECLARE_INTERRUPT_MASK
+#define CLEAR_INTERRUPTS() (void)0
+#define DISABLE_INTERRUPTS() (void)0
+#define RESTORE_INTERRUPTS() (void)0
+#endif
+
+void __osMallocInit(Arena* arena, void* start, s32 size);
+void __osMallocCleanup(Arena* arena);
+s32 __osMallocIsInitialized(Arena* arena);
+void* __osMalloc(Arena* arena, u32 size);
+void* __osMallocR(Arena* arena, u32 size);
+void __osFree(Arena* arena, void* ptr);
+void* __osRealloc(Arena* arena, void* ptr, u32 newSize);
+void ArenaImpl_GetSizes(Arena* arena, u32* outMaxFree, u32* outFree, u32* outAlloc);
+s32 __osCheckArena(Arena* arena);
+
+#if OOT_DEBUG
+void* __osMallocDebug(Arena* arena, u32 size, const char* file, int line);
+void* __osMallocRDebug(Arena* arena, u32 size, const char* file, int line);
+void __osFreeDebug(Arena* arena, void* ptr, const char* file, int line);
+void* __osReallocDebug(Arena* arena, void* ptr, u32 newSize, const char* file, int line);
+void __osDisplayArena(Arena* arena);
+
+extern u32 __osMalloc_FreeBlockTest_Enable;
+#else
+extern u32 gTotalAllocFailures;
+#endif
+
+#endif
diff --git a/spec b/spec
index f86bbe7a42..9dfd4b20c9 100644
--- a/spec
+++ b/spec
@@ -547,9 +547,9 @@ beginseg
 #if OOT_DEBUG
     include "$(BUILD_DIR)/src/code/debug_malloc.o"
 #endif
-#if FAULT_VERSION == FAULT_N64
+#if PLATFORM_N64
     include "$(BUILD_DIR)/src/code/fault_n64.o"
-#elif FAULT_VERSION == FAULT_GC
+#else
     include "$(BUILD_DIR)/src/code/fault_gc.o"
     include "$(BUILD_DIR)/src/code/fault_gc_drawer.o"
 #endif
@@ -604,7 +604,11 @@ beginseg
     include "$(BUILD_DIR)/src/code/fp.o"
     include "$(BUILD_DIR)/src/code/system_malloc.o"
     include "$(BUILD_DIR)/src/code/rand.o"
-    include "$(BUILD_DIR)/src/code/__osMalloc.o"
+#if PLATFORM_N64
+    include "$(BUILD_DIR)/src/code/__osMalloc_n64.o"
+#else
+    include "$(BUILD_DIR)/src/code/__osMalloc_gc.o"
+#endif
 #if !OOT_DEBUG
     include "$(BUILD_DIR)/src/boot/sprintf.o"
 #endif
diff --git a/src/boot/sprintf.c b/src/boot/sprintf.c
index cb80fe39a9..d4af36356d 100644
--- a/src/boot/sprintf.c
+++ b/src/boot/sprintf.c
@@ -3,6 +3,11 @@
 #include "string.h"
 #include "ultra64/xstdio.h"
 
+#if PLATFORM_N64
+// Generated by CVS "$Id$" keyword
+char sSprintfFileInfo[] = "$Id: sprintf.c,v 1.5 1997/03/19 02:28:53 hayakawa Exp $";
+#endif
+
 void* proutSprintf(void* dst, const char* fmt, size_t size) {
     return (char*)memcpy(dst, fmt, size) + size;
 }
diff --git a/src/code/__osMalloc.c b/src/code/__osMalloc_gc.c
similarity index 96%
rename from src/code/__osMalloc.c
rename to src/code/__osMalloc_gc.c
index 598e16a98f..45e19532f1 100644
--- a/src/code/__osMalloc.c
+++ b/src/code/__osMalloc_gc.c
@@ -1,19 +1,22 @@
 #include "global.h"
 #include "fault.h"
+#include "osMalloc.h"
 #include "terminal.h"
 
+#if PLATFORM_GC
+
 #define FILL_ALLOC_BLOCK_FLAG (1 << 0)
 #define FILL_FREE_BLOCK_FLAG (1 << 1)
 #define CHECK_FREE_BLOCK_FLAG (1 << 2)
 
-#define NODE_MAGIC (0x7373)
+#define NODE_MAGIC 0x7373
 
-#define BLOCK_UNINIT_MAGIC (0xAB)
-#define BLOCK_UNINIT_MAGIC_32 (0xABABABAB)
-#define BLOCK_ALLOC_MAGIC (0xCD)
-#define BLOCK_ALLOC_MAGIC_32 (0xCDCDCDCD)
-#define BLOCK_FREE_MAGIC (0xEF)
-#define BLOCK_FREE_MAGIC_32 (0xEFEFEFEF)
+#define BLOCK_UNINIT_MAGIC 0xAB
+#define BLOCK_UNINIT_MAGIC_32 0xABABABAB
+#define BLOCK_ALLOC_MAGIC 0xCD
+#define BLOCK_ALLOC_MAGIC_32 0xCDCDCDCD
+#define BLOCK_FREE_MAGIC 0xEF
+#define BLOCK_FREE_MAGIC_32 0xEFEFEFEF
 
 #define NODE_IS_VALID(node) (((node) != NULL) && ((node)->magic == NODE_MAGIC))
 
@@ -24,6 +27,8 @@
 
 #define SET_DEBUG_INFO(node, file, line, arena) ArenaImpl_SetDebugInfo(node, file, line, arena)
 
+#define FILL_UNINIT_BLOCK(arena, node, size) memset(node, BLOCK_UNINIT_MAGIC, size)
+
 #define FILL_ALLOC_BLOCK(arena, alloc, size)   \
     if ((arena)->flag & FILL_ALLOC_BLOCK_FLAG) \
     memset(alloc, BLOCK_ALLOC_MAGIC, size)
@@ -48,6 +53,7 @@
 #define NODE_GET_PREV(node) (NODE_IS_VALID((node)->prev) ? (node)->prev : NULL)
 
 #define SET_DEBUG_INFO(node, file, line, arena) (void)0
+#define FILL_UNINIT_BLOCK(arena, node, size) (void)0
 #define FILL_ALLOC_BLOCK(arena, alloc, size) (void)0
 #define FILL_FREE_BLOCK_HEADER(arena, node) (void)0
 #define FILL_FREE_BLOCK_CONTENTS(arena, node) (void)0
@@ -68,6 +74,8 @@ u32 gTotalAllocFailures = 0; // "Arena_failcnt"
 
 OSMesg sArenaLockMsg;
 
+void __osMallocAddBlock(Arena* arena, void* start, s32 size);
+
 #if OOT_DEBUG
 u32 __osMalloc_FreeBlockTest_Enable;
 
@@ -164,7 +172,7 @@ ArenaNode* ArenaImpl_GetLastBlock(Arena* arena) {
     return last;
 }
 
-void __osMallocInit(Arena* arena, void* start, u32 size) {
+void __osMallocInit(Arena* arena, void* start, s32 size) {
     bzero(arena, sizeof(Arena));
     ArenaImpl_LockInit(arena);
     __osMallocAddBlock(arena, start, size);
@@ -183,9 +191,7 @@ void __osMallocAddBlock(Arena* arena, void* start, s32 size) {
         size2 = (size - diff) & ~0xF;
 
         if (size2 > (s32)sizeof(ArenaNode)) {
-#if OOT_DEBUG
-            memset(firstNode, BLOCK_UNINIT_MAGIC, size2);
-#endif
+            FILL_UNINIT_BLOCK(arena, firstNode, size2);
             firstNode->next = NULL;
             firstNode->prev = NULL;
             firstNode->size = size2 - sizeof(ArenaNode);
@@ -230,7 +236,7 @@ void __osMallocCleanup(Arena* arena) {
     bzero(arena, sizeof(*arena));
 }
 
-u8 __osMallocIsInitialized(Arena* arena) {
+s32 __osMallocIsInitialized(Arena* arena) {
     return arena->isInit;
 }
 
@@ -267,9 +273,9 @@ void* __osMalloc_NoLockDebug(Arena* arena, u32 size, const char* file, int line)
     void* alloc = NULL;
     ArenaNode* next;
 
-    iter = arena->head;
     size = ALIGN16(size);
     blockSize = ALIGN16(size) + sizeof(ArenaNode);
+    iter = arena->head;
 
     while (iter != NULL) {
         if (iter->isFree && iter->size >= size) {
@@ -357,6 +363,7 @@ void* __osMallocRDebug(Arena* arena, u32 size, const char* file, int line) {
 
         iter = NODE_GET_PREV(iter);
     }
+
     ArenaImpl_Unlock(arena);
 
     return allocR;
@@ -375,9 +382,9 @@ void* __osMalloc_NoLock(Arena* arena, u32 size) {
     iter = arena->head;
 
     while (iter != NULL) {
-
         if (iter->isFree && iter->size >= size) {
             CHECK_FREE_BLOCK(arena, iter);
+
             if (blockSize < iter->size) {
                 newNode = (ArenaNode*)((u32)iter + blockSize);
                 newNode->next = NODE_GET_NEXT(iter);
@@ -398,6 +405,7 @@ void* __osMalloc_NoLock(Arena* arena, u32 size) {
             SET_DEBUG_INFO(iter, NULL, 0, arena);
             alloc = (void*)((u32)iter + sizeof(ArenaNode));
             FILL_ALLOC_BLOCK(arena, alloc, size);
+
             break;
         }
 
@@ -480,7 +488,7 @@ void __osFree_NoLock(Arena* arena, void* ptr) {
     }
 
     node = (ArenaNode*)((u32)ptr - sizeof(ArenaNode));
-    if (node == NULL || node->magic != NODE_MAGIC) {
+    if (!NODE_IS_VALID(node)) {
         PRINTF(VT_COL(RED, WHITE) T("__osFree:不正解放(%08x)\n", "__osFree: Unauthorized release (%08x)\n") VT_RST,
                ptr);
         return;
@@ -546,7 +554,7 @@ void __osFree_NoLockDebug(Arena* arena, void* ptr, const char* file, int line) {
     }
 
     node = (ArenaNode*)((u32)ptr - sizeof(ArenaNode));
-    if (node == NULL || node->magic != NODE_MAGIC) {
+    if (!NODE_IS_VALID(node)) {
         PRINTF(VT_COL(RED, WHITE)
                    T("__osFree:不正解放(%08x) [%s:%d ]\n", "__osFree: Unauthorized release (%08x) [%s:%d ]\n") VT_RST,
                ptr, file, line);
@@ -573,7 +581,6 @@ void __osFree_NoLockDebug(Arena* arena, void* ptr, const char* file, int line) {
 
     FILL_FREE_BLOCK_CONTENTS(arena, node);
 
-    newNext = node->next;
     if ((u32)next == (u32)node + sizeof(ArenaNode) + node->size && next->isFree) {
         newNext = NODE_GET_NEXT(next);
         if (newNext != NULL) {
@@ -848,7 +855,7 @@ void ArenaImpl_FaultClient(Arena* arena) {
     Fault_Printf("Largest Free Block Size %08x\n", maxFree);
 }
 
-u32 __osCheckArena(Arena* arena) {
+s32 __osCheckArena(Arena* arena) {
     ArenaNode* iter;
     u32 error = 0;
 
@@ -858,7 +865,8 @@ u32 __osCheckArena(Arena* arena) {
         arena);
     iter = arena->head;
     while (iter != NULL) {
-        if (iter && iter->magic == NODE_MAGIC) {
+        //! @bug: Probably intended to be `!NODE_IS_VALID(iter)`
+        if (NODE_IS_VALID(iter)) {
 #if OOT_DEBUG
             osSyncPrintf(VT_COL(RED, WHITE) T("おおっと！！ (%08x %08x)\n", "Oops!! (%08x %08x)\n") VT_RST, iter,
                          iter->magic);
@@ -883,3 +891,5 @@ u8 ArenaImpl_GetAllocFailures(Arena* arena) {
     return arena->allocFailures;
 }
 #endif
+
+#endif
diff --git a/src/code/__osMalloc_n64.c b/src/code/__osMalloc_n64.c
new file mode 100644
index 0000000000..bd9c358aff
--- /dev/null
+++ b/src/code/__osMalloc_n64.c
@@ -0,0 +1,474 @@
+#include "global.h"
+#include "fault.h"
+#include "osMalloc.h"
+
+#if PLATFORM_N64
+
+#define NODE_MAGIC 0x7373
+
+#define NODE_IS_VALID(node) ((node)->magic == NODE_MAGIC)
+
+#define NODE_GET_NEXT(node) ((node)->next)
+#define NODE_GET_PREV(node) ((node)->prev)
+
+#define SET_DEBUG_INFO(node, f, l, a)           \
+    {                                           \
+        (node)->filename = (f);                 \
+        (node)->line = (l);                     \
+        (node)->threadId = osGetThreadId(NULL); \
+        (node)->arena = (a);                    \
+        (node)->time = osGetTime();             \
+    }                                           \
+    (void)0
+
+#define FILL_ALLOC_BLOCK(arena, alloc, size) (void)0
+#define FILL_FREE_BLOCK_HEADER(arena, node) (void)0
+#define FILL_FREE_BLOCK_CONTENTS(arena, node) (void)0
+#define CHECK_FREE_BLOCK(arena, node) (void)0
+
+// Number of allocation failures across all arenas.
+u32 gTotalAllocFailures = 0; // "Arena_failcnt"
+
+#define CHECK_ALLOC_FAILURE(arena, ptr) \
+    do {                                \
+        if ((ptr) == NULL) {            \
+            gTotalAllocFailures++;      \
+            (arena)->allocFailures++;   \
+        }                               \
+    } while (0)
+
+void __osMallocInit(Arena* arena, void* start, s32 size) {
+    ArenaNode* firstNode = (ArenaNode*)ALIGN16((u32)start);
+
+    size -= (u8*)firstNode - (u8*)start;
+    size &= ~0xF;
+
+    firstNode->next = NULL;
+    firstNode->prev = NULL;
+    firstNode->size = size - sizeof(ArenaNode);
+    firstNode->isFree = true;
+    firstNode->magic = NODE_MAGIC;
+
+    arena->head = firstNode;
+    arena->start = start;
+    arena->size = size;
+}
+
+void __osMallocCleanup(Arena* arena) {
+    bzero(arena, sizeof(*arena));
+}
+
+s32 __osMallocIsInitialized(Arena* arena) {
+    return arena->start != NULL;
+}
+
+void* __osMallocDebug(Arena* arena, u32 size, const char* file, int line) {
+    ArenaNode* iter;
+    u32 blockSize;
+    ArenaNode* newNode;
+    void* alloc = NULL;
+    ArenaNode* next;
+
+    size = ALIGN16(size);
+    blockSize = ALIGN16(size) + sizeof(ArenaNode);
+    iter = arena->head;
+
+    while (iter != NULL) {
+        if (iter->isFree && iter->size >= size) {
+            CHECK_FREE_BLOCK(arena, iter);
+
+            if (blockSize < iter->size) {
+                newNode = (ArenaNode*)((u32)iter + blockSize);
+                newNode->next = NODE_GET_NEXT(iter);
+                newNode->prev = iter;
+                newNode->size = iter->size - blockSize;
+                newNode->isFree = true;
+                newNode->magic = NODE_MAGIC;
+
+                iter->next = newNode;
+                iter->size = size;
+                next = NODE_GET_NEXT(newNode);
+                if (next) {
+                    next->prev = newNode;
+                }
+            }
+
+            iter->isFree = false;
+            SET_DEBUG_INFO(iter, file, line, arena);
+            alloc = (void*)((u32)iter + sizeof(ArenaNode));
+            FILL_ALLOC_BLOCK(arena, alloc, size);
+
+            break;
+        }
+
+        iter = NODE_GET_NEXT(iter);
+    }
+
+    CHECK_ALLOC_FAILURE(arena, alloc);
+
+    return alloc;
+}
+
+void* __osMallocRDebug(Arena* arena, u32 size, const char* file, int line) {
+    ArenaNode* iter;
+    ArenaNode* newNode;
+    u32 blockSize;
+    u32 nodeSize;
+    ArenaNode* next;
+    void* allocR = NULL;
+    ArenaNode* next2;
+
+    size = ALIGN16(size);
+
+    iter = arena->head;
+    next2 = NODE_GET_NEXT(iter);
+    while (next2 != NULL) {
+        iter = next2;
+        next2 = NODE_GET_NEXT(next2);
+    }
+
+    while (iter != NULL) {
+        if (iter->isFree && iter->size >= size) {
+            CHECK_FREE_BLOCK(arena, iter);
+
+            blockSize = ALIGN16(size) + sizeof(ArenaNode);
+            nodeSize = iter->size;
+            if (blockSize < nodeSize) {
+                newNode = (ArenaNode*)((u32)iter + (iter->size - size));
+                newNode->next = NODE_GET_NEXT(iter);
+                newNode->prev = iter;
+                newNode->size = size;
+                newNode->magic = NODE_MAGIC;
+
+                iter->next = newNode;
+                iter->size -= blockSize;
+                next = NODE_GET_NEXT(newNode);
+                if (next) {
+                    next->prev = newNode;
+                }
+                iter = newNode;
+            }
+
+            iter->isFree = false;
+            SET_DEBUG_INFO(iter, file, line, arena);
+            allocR = (void*)((u32)iter + sizeof(ArenaNode));
+            FILL_ALLOC_BLOCK(arena, allocR, size);
+
+            break;
+        }
+
+        iter = NODE_GET_PREV(iter);
+    }
+
+    CHECK_ALLOC_FAILURE(arena, allocR);
+
+    return allocR;
+}
+
+void* __osMalloc(Arena* arena, u32 size) {
+    ArenaNode* iter;
+    u32 blockSize;
+    ArenaNode* newNode;
+    void* alloc = NULL;
+    ArenaNode* next;
+
+    size = ALIGN16(size);
+    blockSize = ALIGN16(size) + sizeof(ArenaNode);
+    iter = arena->head;
+
+    while (iter != NULL) {
+        if (iter->isFree && iter->size >= size) {
+            CHECK_FREE_BLOCK(arena, iter);
+
+            if (blockSize < iter->size) {
+                newNode = (ArenaNode*)((u32)iter + blockSize);
+                newNode->next = NODE_GET_NEXT(iter);
+                newNode->prev = iter;
+                newNode->size = iter->size - blockSize;
+                newNode->isFree = true;
+                newNode->magic = NODE_MAGIC;
+
+                iter->next = newNode;
+                iter->size = size;
+                next = NODE_GET_NEXT(newNode);
+                if (next) {
+                    next->prev = newNode;
+                }
+            }
+
+            iter->isFree = false;
+            SET_DEBUG_INFO(iter, NULL, 0, arena);
+            alloc = (void*)((u32)iter + sizeof(ArenaNode));
+            FILL_ALLOC_BLOCK(arena, alloc, size);
+
+            break;
+        }
+
+        iter = NODE_GET_NEXT(iter);
+    }
+
+    CHECK_ALLOC_FAILURE(arena, alloc);
+
+    return alloc;
+}
+
+void* __osMallocR(Arena* arena, u32 size) {
+    ArenaNode* iter;
+    ArenaNode* newNode;
+    u32 blockSize;
+    u32 nodeSize;
+    ArenaNode* next;
+    void* allocR = NULL;
+    ArenaNode* next2;
+
+    size = ALIGN16(size);
+
+    iter = arena->head;
+    next2 = NODE_GET_NEXT(iter);
+    while (next2 != NULL) {
+        iter = next2;
+        next2 = NODE_GET_NEXT(next2);
+    }
+
+    while (iter != NULL) {
+        if (iter->isFree && iter->size >= size) {
+            CHECK_FREE_BLOCK(arena, iter);
+
+            blockSize = ALIGN16(size) + sizeof(ArenaNode);
+            nodeSize = iter->size;
+            if (blockSize < nodeSize) {
+                newNode = (ArenaNode*)((u32)iter + (iter->size - size));
+                newNode->next = NODE_GET_NEXT(iter);
+                newNode->prev = iter;
+                newNode->size = size;
+                newNode->magic = NODE_MAGIC;
+
+                iter->next = newNode;
+                iter->size -= blockSize;
+                next = NODE_GET_NEXT(newNode);
+                if (next) {
+                    next->prev = newNode;
+                }
+                iter = newNode;
+            }
+
+            iter->isFree = false;
+            SET_DEBUG_INFO(iter, NULL, 0, arena);
+            allocR = (void*)((u32)iter + sizeof(ArenaNode));
+            FILL_ALLOC_BLOCK(arena, allocR, size);
+
+            break;
+        }
+        iter = NODE_GET_PREV(iter);
+    }
+
+    CHECK_ALLOC_FAILURE(arena, allocR);
+
+    return allocR;
+}
+
+void __osFree(Arena* arena, void* ptr) {
+    ArenaNode* node;
+    ArenaNode* next;
+    ArenaNode* prev;
+
+    if (ptr == NULL) {
+        return;
+    }
+
+    node = (ArenaNode*)((u32)ptr - sizeof(ArenaNode));
+    if (!NODE_IS_VALID(node)) {
+        (void)T("__osFree:不正解放(%08x)\n", "__osFree: Unauthorized release (%08x)\n");
+        osSetIntMask(OS_IM_ALL);
+        return;
+    }
+    if (node->isFree) {
+        (void)T("__osFree:二重解放(%08x)\n", "__osFree: Double release (%08x)\n");
+        osSetIntMask(OS_IM_ALL);
+        return;
+    }
+    if (arena != node->arena && arena != NULL) {
+        (void)T("__osFree:arena(%08x)が__osMallocのarena(%08x)と一致しない\n",
+                "__osFree:arena(%08x) and __osMalloc:arena(%08x) do not match\n");
+    }
+
+    node->isFree = true;
+    SET_DEBUG_INFO(node, NULL, 0, arena);
+
+    if (node->next != NULL) {
+        next = node->next;
+        if (next->isFree) {
+            if (next->next != NULL) {
+                next->next->prev = node;
+            }
+
+            node->size += next->size + sizeof(ArenaNode);
+            node->next = next->next;
+        }
+    }
+
+    if (node->prev != NULL) {
+        prev = node->prev;
+        if (prev->isFree) {
+            prev->size += node->size + sizeof(ArenaNode);
+            prev->next = NODE_GET_NEXT(node);
+
+            if (node->next != NULL) {
+                node->next->prev = prev;
+            }
+        }
+    }
+}
+
+void __osFreeDebug(Arena* arena, void* ptr, const char* file, int line) {
+    ArenaNode* node;
+    ArenaNode* next;
+    ArenaNode* prev;
+
+    if (ptr == NULL) {
+        return;
+    }
+
+    node = (ArenaNode*)((u32)ptr - sizeof(ArenaNode));
+    if (!NODE_IS_VALID(node)) {
+        (void)T("__osFree:不正解放(%08x)\n", "__osFree: Unauthorized release (%08x)\n");
+        osSetIntMask(OS_IM_ALL);
+        return;
+    }
+    if (node->isFree) {
+        (void)T("__osFree:二重解放(%08x)\n", "__osFree: Double release (%08x)\n");
+        osSetIntMask(OS_IM_ALL);
+        return;
+    }
+    if (arena != node->arena && arena != NULL) {
+        (void)T("__osFree:arena(%08x)が__osMallocのarena(%08x)と一致しない\n",
+                "__osFree:arena(%08x) and __osMalloc:arena(%08x) do not match\n");
+    }
+
+    node->isFree = true;
+    SET_DEBUG_INFO(node, file, line, arena);
+
+    if (node->next != NULL) {
+        next = node->next;
+        if (next->isFree) {
+            if (next->next != NULL) {
+                next->next->prev = node;
+            }
+
+            node->size += next->size + sizeof(ArenaNode);
+            node->next = next->next;
+        }
+    }
+
+    if (node->prev != NULL) {
+        prev = node->prev;
+        if (prev->isFree) {
+            prev->size += node->size + sizeof(ArenaNode);
+            prev->next = NODE_GET_NEXT(node);
+
+            if (node->next != NULL) {
+                node->next->prev = prev;
+            }
+        }
+    }
+}
+
+void* __osRealloc(Arena* arena, void* ptr, u32 newSize) {
+    ArenaNode* node;
+    void* newAlloc;
+    ArenaNode* next;
+    ArenaNode* newNext;
+    u32 sizeDiff;
+
+    (void)"__osRealloc(%08x, %d)\n";
+    osSetIntMask(OS_IM_ALL);
+
+    if (ptr == NULL) {
+        ptr = __osMalloc(arena, newSize);
+    } else if (newSize == 0) {
+        __osFree(arena, ptr);
+        ptr = NULL;
+    } else {
+        newSize = ALIGN16(newSize);
+        node = (ArenaNode*)((u32)ptr - sizeof(ArenaNode));
+        if (newSize == node->size) {
+            // Do nothing
+        } else if (node->size < newSize) {
+            next = NODE_GET_NEXT(node);
+            sizeDiff = newSize - node->size;
+            if (next != NULL && next->isFree && next->size >= sizeDiff) {
+                next->size -= sizeDiff;
+                newNext = (ArenaNode*)((u32)next + sizeDiff);
+                if (NODE_GET_NEXT(next) != NULL) {
+                    NODE_GET_NEXT(next)->prev = newNext;
+                }
+                node->next = newNext;
+                node->size = newSize;
+                memmove(node->next, next, sizeof(ArenaNode));
+            } else {
+                newAlloc = __osMalloc(arena, newSize);
+                if (newAlloc != NULL) {
+                    memcpy(ptr, newAlloc, node->size);
+                    __osFree(arena, ptr);
+                }
+                ptr = newAlloc;
+            }
+        } else if (newSize < node->size) {
+            (void)T("メモリブロックの縮小機能はまだインプリメントしていません\n",
+                    "Memory block shrinking functionality is not yet implemented\n");
+        }
+    }
+
+    CHECK_ALLOC_FAILURE(arena, ptr);
+
+    return ptr;
+}
+
+void* __osReallocDebug(Arena* arena, void* ptr, u32 newSize, const char* file, int line) {
+    return __osRealloc(arena, ptr, newSize);
+}
+
+void ArenaImpl_GetSizes(Arena* arena, u32* outMaxFree, u32* outFree, u32* outAlloc) {
+    ArenaNode* iter;
+
+    *outMaxFree = 0;
+    *outFree = 0;
+    *outAlloc = 0;
+
+    iter = arena->head;
+    while (iter != NULL) {
+        if (iter->isFree) {
+            *outFree += iter->size;
+            if (*outMaxFree < iter->size) {
+                *outMaxFree = iter->size;
+            }
+        } else {
+            *outAlloc += iter->size;
+        }
+
+        iter = NODE_GET_NEXT(iter);
+    }
+}
+
+s32 __osCheckArena(Arena* arena) {
+    ArenaNode* iter;
+
+    (void)T("アリーナの内容をチェックしています．．． (%08x)\n", "Checking the arena contents... (%08x)\n");
+    iter = arena->head;
+    while (iter != NULL) {
+        if (!NODE_IS_VALID(iter)) {
+            (void)T("おおっと！！ (%08x %08x)\n", "Oops!! (%08x %08x)\n");
+            return 1;
+        }
+        iter = NODE_GET_NEXT(iter);
+    }
+
+    (void)T("アリーナはまだ、いけそうです\n", "The arena is still going well\n");
+    return 0;
+}
+
+u8 ArenaImpl_GetAllocFailures(Arena* arena) {
+    return arena->allocFailures;
+}
+
+#endif
diff --git a/src/code/code_800FC620.c b/src/code/code_800FC620.c
index eafbe5080e..4d7b7b4efe 100644
--- a/src/code/code_800FC620.c
+++ b/src/code/code_800FC620.c
@@ -1,4 +1,5 @@
 #include "global.h"
+#include "osMalloc.h"
 
 typedef void (*arg3_800FC868)(void*);
 typedef void (*arg3_800FC8D8)(void*, u32);
@@ -26,43 +27,64 @@ char D_80134488[0x18] = {
 
 // possibly some kind of new() function
 void* func_800FC800(u32 size) {
+    DECLARE_INTERRUPT_MASK
+    void* ptr;
+
+    DISABLE_INTERRUPTS();
+
     if (size == 0) {
         size = 1;
     }
 
 #if OOT_DEBUG
-    return __osMallocDebug(&gSystemArena, size, sNew, 0);
+    ptr = __osMallocDebug(&gSystemArena, size, sNew, 0);
 #else
-    return __osMalloc(&gSystemArena, size);
+    ptr = __osMalloc(&gSystemArena, size);
 #endif
+
+    RESTORE_INTERRUPTS();
+    return ptr;
 }
 
 // possibly some kind of delete() function
 void func_800FC83C(void* ptr) {
+    DECLARE_INTERRUPT_MASK
+
+    DISABLE_INTERRUPTS();
     if (ptr != NULL) {
         __osFree(&gSystemArena, ptr);
     }
+    RESTORE_INTERRUPTS();
 }
 
 void func_800FC868(void* blk, u32 nBlk, u32 blkSize, arg3_800FC868 arg3) {
+    DECLARE_INTERRUPT_MASK
     u32 pos;
 
-    for (pos = (u32)blk; pos < (u32)blk + (nBlk * blkSize); pos = (u32)pos + (blkSize & ~0)) {
+    DISABLE_INTERRUPTS();
+    for (pos = ((u32)blk & ~0); pos < (u32)blk + (nBlk * blkSize); pos = (u32)pos + (blkSize & ~0)) {
         arg3((void*)pos);
     }
+    RESTORE_INTERRUPTS();
 }
 
 void func_800FC8D8(void* blk, u32 nBlk, s32 blkSize, arg3_800FC8D8 arg3) {
+    DECLARE_INTERRUPT_MASK
     u32 pos;
 
-    for (pos = (u32)blk; pos < (u32)blk + (nBlk * blkSize); pos = (u32)pos + (blkSize & ~0)) {
+    DISABLE_INTERRUPTS();
+    for (pos = ((u32)blk & ~0); pos < (u32)blk + (nBlk * blkSize); pos = (u32)pos + (blkSize & ~0)) {
         arg3((void*)pos, 2);
     }
+    RESTORE_INTERRUPTS();
 }
 
 void* func_800FC948(void* blk, u32 nBlk, u32 blkSize, arg3_800FC948 arg3) {
+    DECLARE_INTERRUPT_MASK
     u32 pos;
 
+    DISABLE_INTERRUPTS();
+
     if (blk == NULL) {
         blk = func_800FC800(nBlk * blkSize);
     }
@@ -74,29 +96,35 @@ void* func_800FC948(void* blk, u32 nBlk, u32 blkSize, arg3_800FC948 arg3) {
             pos = (u32)pos + (blkSize & ~0);
         }
     }
+
+    RESTORE_INTERRUPTS();
     return blk;
 }
 
 void func_800FCA18(void* blk, u32 nBlk, u32 blkSize, arg3_800FCA18 arg3, s32 arg4) {
+    DECLARE_INTERRUPT_MASK
     u32 pos;
     u32 end;
 
-    if (blk == NULL) {
-        return;
-    }
-    if (arg3 != NULL) {
-        end = (u32)blk;
-        pos = (u32)end + (nBlk * blkSize);
+    DISABLE_INTERRUPTS();
 
-        while (pos > end) {
-            pos -= (s32)(blkSize & ~0);
-            arg3((void*)pos, 2);
+    if (blk != NULL) {
+        if (arg3 != NULL) {
+            end = (u32)blk;
+            pos = (u32)end + (nBlk * blkSize);
+
+            while (pos > end) {
+                pos -= (s32)(blkSize & ~0);
+                arg3((void*)pos, 2);
+            }
+        }
+
+        if (arg4 != 0) {
+            func_800FC83C(blk);
         }
     }
 
-    if (arg4 != 0) {
-        func_800FC83C(blk);
-    }
+    RESTORE_INTERRUPTS();
 }
 
 void func_800FCB34(void) {
@@ -120,6 +148,11 @@ void func_800FCB34(void) {
 }
 
 void SystemHeap_Init(void* start, u32 size) {
+#if PLATFORM_N64
+    __osMallocInit(&gSystemArena, start, size);
+#else
     SystemArena_Init(start, size);
+#endif
+
     func_800FCB34();
 }
diff --git a/src/code/debug_malloc.c b/src/code/debug_malloc.c
index 3e31f78455..5be04b23c0 100644
--- a/src/code/debug_malloc.c
+++ b/src/code/debug_malloc.c
@@ -1,4 +1,5 @@
 #include "global.h"
+#include "osMalloc.h"
 
 #define LOG_SEVERITY_NOLOG 0
 #define LOG_SEVERITY_ERROR 2
@@ -125,6 +126,6 @@ void DebugArena_Cleanup(void) {
     __osMallocCleanup(&sDebugArena);
 }
 
-u8 DebugArena_IsInitialized(void) {
+s32 DebugArena_IsInitialized(void) {
     return __osMallocIsInitialized(&sDebugArena);
 }
diff --git a/src/code/fault_gc.c b/src/code/fault_gc.c
index 587f7cb249..0402573ad3 100644
--- a/src/code/fault_gc.c
+++ b/src/code/fault_gc.c
@@ -40,15 +40,11 @@
  * DPad-Up may be pressed to enable sending fault pages over osSyncPrintf as well as displaying them on-screen.
  * DPad-Down disables sending fault pages over osSyncPrintf.
  */
+#if PLATFORM_GC
+
 #pragma increment_block_number "gc-eu:240 gc-eu-mq:240 gc-eu-mq-dbg:224 gc-jp:240 gc-jp-ce:240 gc-jp-mq:240 gc-us:240" \
                                "gc-us-mq:240"
 
-// Include versions.h first and redefine FAULT_VERSION
-// This allows this file to compile even when versions.h uses FAULT_N64
-#include "versions.h"
-#undef FAULT_VERSION
-#define FAULT_VERSION FAULT_GC
-
 #include "global.h"
 #include "alloca.h"
 #include "fault.h"
@@ -1336,3 +1332,5 @@ NORETURN void Fault_AddHungupAndCrash(const char* file, int line) {
     sprintf(msg, "HungUp %s:%d", file, line);
     Fault_AddHungupAndCrashImpl(msg, NULL);
 }
+
+#endif
diff --git a/src/code/fault_gc_drawer.c b/src/code/fault_gc_drawer.c
index dbdcba7e7f..5cf088fca6 100644
--- a/src/code/fault_gc_drawer.c
+++ b/src/code/fault_gc_drawer.c
@@ -4,17 +4,12 @@
  * Implements routines for drawing text with a fixed font directly to a framebuffer, used in displaying
  * the crash screen implemented by fault.c
  */
-
-// Include versions.h first and redefine FAULT_VERSION
-// This allows this file to compile even when versions.h uses FAULT_N64
-#include "versions.h"
-#undef FAULT_VERSION
-#define FAULT_VERSION FAULT_GC
-
 #include "global.h"
 #include "fault.h"
 #include "terminal.h"
 
+#if PLATFORM_GC
+
 typedef struct FaultDrawer {
     /* 0x00 */ u16* fb;
     /* 0x04 */ u16 w;
@@ -348,3 +343,5 @@ void Fault_InitDrawer(void) {
     bcopy(&sFaultDrawerDefault, &sFaultDrawer, sizeof(FaultDrawer));
     sFaultDrawer.fb = (u16*)(PHYS_TO_K0(osMemSize) - sizeof(u16[SCREEN_HEIGHT][SCREEN_WIDTH]));
 }
+
+#endif
diff --git a/src/code/fault_n64.c b/src/code/fault_n64.c
index da9d7bf6fd..5a8dd9d1d6 100644
--- a/src/code/fault_n64.c
+++ b/src/code/fault_n64.c
@@ -1,14 +1,11 @@
-// Include versions.h first and redefine FAULT_VERSION
-// This allows this file to compile even when versions.h uses FAULT_GC
-#include "versions.h"
-#undef FAULT_VERSION
-#define FAULT_VERSION FAULT_N64
-
 #include "global.h"
 #include "fault.h"
+#include "osMalloc.h"
 #include "stack.h"
 #include "terminal.h"
 
+#if PLATFORM_N64
+
 typedef struct FaultMgr {
     OSThread thread;
     char unk_1B0[0x400];
@@ -846,3 +843,5 @@ void Fault_AddHungupAndCrash(const char* file, int line) {
     sprintf(msg, "HungUp %s:%d", file, line);
     Fault_AddHungupAndCrashImpl(msg, NULL);
 }
+
+#endif
diff --git a/src/code/game.c b/src/code/game.c
index ffb8bc8471..07007f6a70 100644
--- a/src/code/game.c
+++ b/src/code/game.c
@@ -1,5 +1,6 @@
 #include "global.h"
 #include "fault.h"
+#include "osMalloc.h"
 #include "terminal.h"
 #if PLATFORM_N64
 #include "n64dd.h"
diff --git a/src/code/rand.c b/src/code/rand.c
index ce2beb9e30..917b1ecfc6 100644
--- a/src/code/rand.c
+++ b/src/code/rand.c
@@ -42,7 +42,6 @@
  * @note Original name: qrand.c
  */
 #include "rand.h"
-#include "versions.h"
 
 #define RAND_MULTIPLIER 1664525
 #define RAND_INCREMENT 1013904223
@@ -54,7 +53,7 @@
  */
 static u32 sRandInt = 1;
 
-#if RAND_VERSION == RAND_GC
+#if PLATFORM_GC
 /**
  * Space to store a value to be re-interpreted as a float.
  *
@@ -69,7 +68,7 @@ static fu sRandFloat;
  * @note Original name: qrand
  */
 u32 Rand_Next(void) {
-#if RAND_VERSION == RAND_N64
+#if PLATFORM_N64
     u32 next = sRandInt * RAND_MULTIPLIER + RAND_INCREMENT;
 
     sRandInt = next;
@@ -98,7 +97,7 @@ void Rand_Seed(u32 seed) {
  * @note Original name: fqrand
  */
 f32 Rand_ZeroOne(void) {
-#if RAND_VERSION == RAND_N64
+#if PLATFORM_N64
     fu v;
     f32 vf;
 
@@ -115,7 +114,7 @@ f32 Rand_ZeroOne(void) {
 #endif
 }
 
-#if RAND_VERSION == RAND_GC
+#if PLATFORM_GC
 /**
  * Returns a pseudo-random floating-point number between -0.5f and 0.5f by the same manner in which Rand_ZeroOne
  * generates its result.
@@ -164,7 +163,7 @@ u32 Rand_Next_Variable(u32* rndNum) {
  * @note Original name: fqrand_r
  */
 f32 Rand_ZeroOne_Variable(u32* rndNum) {
-#if RAND_VERSION == RAND_N64
+#if PLATFORM_N64
     fu v;
     f32 vf;
     u32 next = Rand_Next_Variable(rndNum);
@@ -180,7 +179,7 @@ f32 Rand_ZeroOne_Variable(u32* rndNum) {
 #endif
 }
 
-#if RAND_VERSION == RAND_GC
+#if PLATFORM_GC
 /**
  * Generates the next pseudo-random floating-point number between -0.5f and 0.5f from the provided rndNum.
  *
diff --git a/src/code/system_malloc.c b/src/code/system_malloc.c
index 8385a883c0..de6a56b30a 100644
--- a/src/code/system_malloc.c
+++ b/src/code/system_malloc.c
@@ -1,4 +1,5 @@
 #include "global.h"
+#include "osMalloc.h"
 
 #define LOG_SEVERITY_NOLOG 0
 #define LOG_SEVERITY_ERROR 2
@@ -6,16 +7,6 @@
 
 Arena gSystemArena;
 
-#if PLATFORM_N64
-#define DECLARE_INTERRUPT_MASK OSIntMask __mask;
-#define DISABLE_INTERRUPTS() __mask = osSetIntMask(OS_IM_NONE)
-#define RESTORE_INTERRUPTS() osSetIntMask(__mask)
-#else
-#define DECLARE_INTERRUPT_MASK
-#define DISABLE_INTERRUPTS() (void)0
-#define RESTORE_INTERRUPTS() (void)0
-#endif
-
 #if OOT_DEBUG
 s32 gSystemArenaLogSeverity = LOG_SEVERITY_NOLOG;
 
@@ -176,6 +167,6 @@ void SystemArena_Cleanup(void) {
     __osMallocCleanup(&gSystemArena);
 }
 
-u8 SystemArena_IsInitialized(void) {
+s32 SystemArena_IsInitialized(void) {
     return __osMallocIsInitialized(&gSystemArena);
 }
diff --git a/src/code/z_malloc.c b/src/code/z_malloc.c
index 979de62fea..5b1c5637fa 100644
--- a/src/code/z_malloc.c
+++ b/src/code/z_malloc.c
@@ -1,4 +1,5 @@
 #include "global.h"
+#include "osMalloc.h"
 
 #define LOG_SEVERITY_NOLOG 0
 #define LOG_SEVERITY_ERROR 2
@@ -124,6 +125,6 @@ void ZeldaArena_Cleanup(void) {
     __osMallocCleanup(&sZeldaArena);
 }
 
-u8 ZeldaArena_IsInitialized(void) {
+s32 ZeldaArena_IsInitialized(void) {
     return __osMallocIsInitialized(&sZeldaArena);
 }
diff --git a/tools/disasm/ntsc-1.2/files_code.csv b/tools/disasm/ntsc-1.2/files_code.csv
index 8aec80c335..dd1ac65e8b 100644
--- a/tools/disasm/ntsc-1.2/files_code.csv
+++ b/tools/disasm/ntsc-1.2/files_code.csv
@@ -132,7 +132,7 @@ BC670,800CDD50,src/code/fp_math
 BCA20,800CE100,src/code/fp
 BCB80,800CE260,src/code/system_malloc
 BCDF0,800CE4D0,src/code/rand
-BCEF0,800CE5D0,src/code/__osMalloc
+BCEF0,800CE5D0,src/code/__osMalloc_n64
 BD8A0,800CEF80,src/boot/sprintf
 BD970,800CF050,src/code/printutils
 BD9D0,800CF0B0,src/code/jpegutils
@@ -292,7 +292,8 @@ F3AD0,801051B0,src/code/gfxprint
 F4380,80105A60,src/code/loadfragment2_n64
 F4390,80105A70,src/code/code_800FC620
 F43A0,80105A80,src/code/rand
-F43B0,80105A90,src/code/__osMalloc
+F43B0,80105A90,src/code/__osMalloc_n64
+F43C0,80105AA0,src/boot/sprintf
 F4400,80105AE0,src/libultra/gu/sins
 F4C00,801062E0,src/libultra/io/siacs
 F4C10,801062F0,src/libultra/io/controller
@@ -379,6 +380,7 @@ F9190,8010A870,src/code/gfxprint
 F91D0,8010A8B0,src/code/rcp_utils
 F9320,8010AA00,src/code/loadfragment2_n64
 F94C0,8010ABA0,src/code/fp_math
+F94E0,8010ABC0,src/code/__osMalloc_n64
 F9690,8010AD70,src/libultra/gu/sinf
 F96E0,8010ADC0,src/libultra/gu/perspective
 F96F0,8010ADD0,src/libultra/gu/lookathil
diff --git a/tools/disasm/ntsc-1.2/functions.txt b/tools/disasm/ntsc-1.2/functions.txt
index 457c53d6eb..a3c4c7520b 100644
--- a/tools/disasm/ntsc-1.2/functions.txt
+++ b/tools/disasm/ntsc-1.2/functions.txt
@@ -2931,7 +2931,7 @@ __osRealloc = 0x800CED54; // type:func
 __osReallocDebug = 0x800CEEA8; // type:func
 ArenaImpl_GetSizes = 0x800CEEC8; // type:func
 __osCheckArena = 0x800CEF3C; // type:func
-func_800FF334 = 0x800CEF78; // type:func
+ArenaImpl_GetAllocFailures = 0x800CEF78; // type:func
 proutSprintf = 0x800CEF80; // type:func
 vsprintf = 0x800CEFA4; // type:func
 sprintf = 0x800CEFF4; // type:func