SM64 Memory Map

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Separate each individual keyword with spaces. Surround a phrase with quotes to look for the exact phrase, or with / to use a PCRE regular expression. Prepend with - to exclude a keyword or phrase, with + to require a whole word or phrase, or with -+ to exclude a whole word or phrase. ? matches any character, * matches any number of characters.

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RAM Address	Length	Type	Context	Description
$80064F80	Unknown	Misc.	Global	Segment 0x02 constant location - Contains image data for the hud symbols and other textures. The segment is allocated by a hardcoded routine on startup.
$8006C680	Unknown	Misc.	Global	Table with segment-offset pointers to the HUD symbol textures. Since some of the HUD symbols were removed in the USA release, some of the slots are left empty: 8006C6CC 00000000 - J 8006C6E8 00000000 - Q 8006C6FC 00000000 - V 8006C704 00000000 - X 8006C70C 00000000 - Z You can restore the old symbols by patching in the images from the Japanese ROM, and modifying the pointers in this table.
$8007E200	Unknown	Misc.	Global	Segment 0x15
$8007EC20	Unknown	Misc.	Global	Segment 0x04 - Contains the data for Mario's model
$800EB180	Unknown	Misc.	Global	Segment 0x13 - Behavior script segment
$800EC5F8	52 bytes	Behaviour	Global	Behavior script - Purple switch
$800ED3FC	32 bytes	Behaviour	Global	Behavior script - Spinning exclamation point
$800EDBC8	12 bytes	Behaviour	Global	Behavior script - Misc level architecture (eg the castle tower)
$800EDC24	44 bytes	Behaviour	Global	Tree's behavior script
$800EE040	56 bytes	Behaviour	Global	Mario's behavior script 00000000 10050000 11010100 11030001 23000000 002500A0 08000000 0C000000 802CB1C0 0C000000 8029CA58 0C000000 802CB264 09000000
$800EE2F4	56 bytes	Behaviour	Global	Bob-omb's behavior script
$800F0860	Unknown	Geometry Layout	Global	Mario's decompressed geo-layout script
$800F8C4C	Unknown	Geometry Layout	Global	Decompressed geo-layout script for signs
$8018D47C	554 bytes	Geometry Layout	Global	Bob-omb's decompressed geo-layout
$80195C54	Unknown	Geometry Layout	Overworld	Decompressed geo-layout script for the castle tower
$801C1000	Unknown	Misc.	Global	Segment 0x09 constant location. All level mesh textures are loaded here by the 0x1A level script command.
$80207700	512 bytes	Misc.	Global	Start of EEPROM and goes up to 0x80207900
$80277EE0	Unknown	Routine	Global	Function that assigns ram segments Arguments: A0 = segment number, A1 = ram address Returns: V0 = 0x80-prefix-less ram address Essentially just: (uint32)(0x8033B400 + segment_number << 2) = ram_address & 0x00FFFFFF;
$80277F50	Unknown	Routine	Global	Segment-offset to true ram address converter Arguments: A0 = segmented address Returns: V0 = true ram address
$80278120	118 bytes	Routine	Global	Function that seems to be a memory allocator. Basically finds a desired amount of free space in the heap and returns a pointer to the area. Arguments: A0 = block size Returns: V0 = ram address
$80278504	264 bytes	Routine	Global	DmaCopy(u32 dst, u32 bottom, u32 top); dst being the RAM offset! bottom is the beginning ROM offset to copy the bytes and top is the end. Takes three arguments. Example: ADDIU SP, SP, $FFE8 ; -24 to stack. Aka, make space. SW RA, $0014 (SP) ; Push return address to stack. LUI A0, $8034 ; Upper half address. ORI A0, A0, $269D ; Lower half address. A0 = $8034269D LUI A1, $001C ; ROM offset start (bottom) ORI A1, $0D60 ; Lower part, A1 = $001C0D60 LUI A2, $0020 ; ROM offset end (top) JAL $80278504 ; Jump to subroutine DmaCopy ORI A2, $00D1 ; Is executed before JAL. Lower half. LW RA, $0014 (SP) ; Load back our lost return address. JR RA ; Jump to return address. ADDIU SP, SP, $0018 ; Restores stack. (+24) DmaCopy basically copies data from ROM to RAM. dst is the destination (as RAM offset), bottom is the start (as ROM offset) which is copied to RAM and top is the end. So, in our above example bytes from $001C0D60 (ROM) to $002000D1 (ROM) into $8034269D (RAM).
$80278610	124 bytes	Routine	Global	Function that loads data from rom into the heap and returns a ram pointer to the data. Arguments: A0 = rom start address, A1 = rom end address, A2 = allocation size (seems mostly unused?) Returns: V0 = pointer to data after being loaded into ram
$802787D8	216 bytes	Routine	Global	Function that loads MIO0 files into ram segments. Arguments: A0 = ram segment number, A1 = rom address start, A2 = rom address end
$802792C0	84 bytes	Routine	Global	EEPROM Save file checksum calculation routine Arguments: A0 = address of buffer, A1 = buffer size, A2 = ? 00004441 Returns: 2 byte checksum to V0
$8027F4E0	164 bytes	Routine	Global	MIO0 decoder Arguments: A0 = pointer to mio0 file (in RAM), A1 = destination address for the decompressed file
$8029E27C	Unknown	Routine	Global	Distance From Object: Calculates the distance of 2 objects Arguments: A0 = object 1 ptr, A1 = object 2 ptr Returns: F0 = distance between objects (float) This function only checks the X and Z positions of the two objects. The Y position is not taken into account.
$8029EDCC	88 bytes	Routine	Global	Function that spawns an object at another object's location Arguments: A0 = pointer to relative object, A1 = graphics id, A2 = behavior segment offset Returns: V0 = pointer to the newly spawned object
$802A3754	68 bytes	Routine	Global	IsMarioGroundPounding function Detects if Mario is ground-pounding the current object. No parameters. Returns V0 = 1 if true, and V0 = 0 if false.
$802A3CFC	56 bytes	Routine	Global	IsMarioStepping function This function detects if Mario is on-top of the current object. This function is used in many places like in the cap switches. Takes no parameters. Returns V0 = 1 if Mario is stepping on the object, otherwise V0 will return 0.
$802D62D8	Unknown	Routine	Global	Hud number printing function Arguments: A0 = x, A1 = y, A2 = pointer to ascii format string, A3 = number value The format string argument is very similar to the one used in C's 'printf' function. http://www.cplusplus.com/reference/cstdio/printf/
$802D6554	Unknown	Routine	Global	HUD Symbol printing function - Prints an ascii string to the screen. Arguments: A0 = int x, A1 = int y, A2 = pointer to ascii string
$802D6858	56 bytes	Routine	Global	Function that converts ascii chars to sm64 chars. Arguments: A0 = ascii byte Returns: V0 = sm64 byte
$802DB498	584 bytes	Routine	Global	Function that prints animated red coins to the screen Arguments: A0 = x, A1 = y
$802E2CF0	160 bytes	Routine	Global	Function that prints the camera images in the bottom right corner of the screen. (The lakitu, camera, mario, and X symbols) Arguments: A0 = int x, A1 = int y, A2 = segment-offset to raw image data
$802E2E58	258 bytes	Routine	Global	Function that prints the little yellow C button symbols when zooming in and out Arguments: A0 = int left, A1 = int bottom, A2 = segment offset pointer to raw image
$802E6AF8	Unknown	Routine	Global	Object behavior function - explode! (and spawn a coin) Args: none Returns: none
$802F3C9F	1 byte	Misc.	Global	1UP Modifier, change 0x01 to value of lives you want Mario to get when collecting a 1UP.
$803223B0	220 bytes	Routine	Global	OSTime osGetTime(void); void osSetTime(OSTime time); Calling the osGetTime function returns the time since the last cold reset, expressed in units of CPU count register cycles. Regardless of whether the system is NTSC or PAL, this counter increments at 46.875 MHz, with 1 cycle equal to approximately 21.33 nanoseconds. When the counter reaches its maximum value, it returns to zero and continues to increment. (Since the real time counter has a length of 64 bits, unless the counter value is changed by calling osSetTime it will take more than 10,000 years for the counter to reach its maximum value and return to zero.) The osSetTime function is used to set the value of the real time counter. Note that the OSTime type is defined as u64 (unsigned long long), so you should specify "%llu" for the conversion format if you are going to output this type of numerical value with a printf function. Note: Since the VI Manager performs timer management, you must activate the VI Manager with osCreateViManager before using this function.
$80322640	100 bytes	Routine	Global	void osViSetEvent(OSMesgQueue *mq, OSMesg msg, u32 retraceCount); Arguments mq Message queue address (0x8033AF78) msg Message announced when vertical retrace occurs retraceCount Retrace count This function registers the specified message queue and message in the VI manager. The program can thus receive the message (msg) announced by the message queue (mq)) from the VI manager when a vertical retrace occurs. The send cycle for the message is changed according to the value set in the retrace count (retraceCount). For instance, while the cycle is 60Hz when this is set to 1, it becomes a low speed 30Hz when it is set to 2, decreasing the frequency at which the application receives the vertical retrace announcement (message send cycle = 60Hz/retrace count). Return Values None. ##Precautions## Execute this function after setting the display mode (see osViSetMode).
$80322F70	380 bytes	Routine	Global	void osCreateViManager(OSPri pri); The VI manager is a system thread that must be created and invoked at the beginning of the application. To do this, call osCreateViManager() for the VI manager to allow vertical retrace interrupt to occur at an early stage. Usually, this priority should be set to OS_PRIORITY_VIMGR. The VI manager is designed to service both the VI interrupt (OS_EVENT_VI) and CPU counter interrupt(OS_EVENT_COUNTER) in the most efficient manner. Each interrupting event can be performed using osViSetEvent or osSetTimer. Return Values: None.
$803232D0	96 bytes	Routine	Global	void osViSetMode(OSViMode *mode); Arguments mode VI mode This function lets you set the current VI Mode. It supports a total of 56 modes, those break down in 14 NTSC modes, 14 PAL modes, 14 MPAL modes and 14 full-screen display PAL (FPAL) modes. The attributes of each mode, such as interlace and non-interlace, 16-bit color pixels and 32-bit color pixels, low-resolution and high-resolution, etc., can be set. In addition, the resolution can be dropped or images can be rescaled in order to increase rendering speed. The last 4 characters of the symbol name (LPN1, etc.) comprise the following codes. 1st character: H = High resolution L = Low resolution 2nd Character: A = Anti-aliasing P = Point sampling 3rd Character Low resolution N = Non-interlaced F = Interlaced High resolution N = Normal interlaced F = Deflickered interlaced 4th Character 1 = 16-bit pixel size 2 = 32-bit pixel size (Modes have yet to be found in the ROM)
$803233B0	432 bytes	Routine	Global	void osViSetSpecialFeatures(u32 func); Sets special VI functions. Argument func Turn special VI function ON/OFF: OS_VI_GAMMA_ON 0x0001 (Default: ON) OS_VI_GAMMA_OFF 0x0002 OS_VI_GAMMA_DITHER_ON 0x0004 (Default: ON) OS_VI_GAMMA_DITHER_OFF 0x0008 OS_VI_DIVOT_ON 0x0010 (Default: ON) OS_VI_DIVOT_OFF 0x0020 OS_VI_DITHER_FILTER_ON 0x0040 (16bit-default): ON OS_VI_DITHER_FILTER_OFF 0x0080 (32bit-default): OFF ##Precautions## osViSetMode returns all of the function settings set with osViSetSpecialFeatures to their default values according to the display mode specified in the argument.
$80325310	Unknown	Misc.	Global	Cosine function Arguments: F12 = input angle (in radians) Returns: F0 = resulting value
$80325480	Unknown	Routine	Global	Sine function Arguments: F12 = input angle (in radians) Returns: F0 = resulting value
$803273F0	40 bytes	Routine	Global	memcpy(u32 dst, u32 src, u32 num); Copies bytes in the RAM from one location to another. Arguments: A0 = Pointer to RAM destination to copy to. A1 = Pointer to RAM source to copy from. A2 = Number of bytes to copy. Returns: V0 = Pointer to RAM desitination
$8032741C	36 bytes	Routine	Global	strlen (char * str) Gets the length of an ascii string. A0 = pointer to string V0 = length of string Example: "Hello World!" would return 12.
$80327444	60 bytes	Routine	Global	strchr (char * str, u8 character); returns a pointer to the first instance of 'character' A0 = pointer to string A1 = ASCII character to be located. V0 = pointer to the first occurrence. If no matching character was found, then V0 will return 0. Example: A0 = "Hello World!" A1 = 0x57 ('W') will return "World!"
$803284B0	224 bytes	Routine	Global	Function used to load sounds and Mario's animation sequences into ram on the fly. Args:A0 = (always 0?), A1 = rom address, A2 = destination ram address, A3 = block size Returns: V0 = 0 (success); V0 = -1 (fail)
$8032D5E4	4 bytes	Pointer	Global	Pointer that contains the pointer to the first controller structure.
$8032DDCC	4 bytes	Pointer	Global	Pointer to the current area struct pointer.
$8032DF00	4 bytes	Misc.	Global	Pointer to current object as used by the geo-layout script rendering system. An ASM routine reads the object pointer at this address, and then writes the pointer into a geo-layout's object pointer slot.
$80331620	1 byte	Misc.	Global	Current level's act number
$80338388	2 bytes	Misc.	Global	Format string for number of lives in the HUD - "%d"
$803383A0	2 bytes	Misc.	Global	Format string for the number of stars in the HUD
$803383A4	1 byte	Misc.	Global	Format string for HUD beta keys; "/" or 0x2F
$8033B079	1 byte	Misc.	Global	Result of function osEepromProbe(). Read this byte to check if the eeprom has been loaded properly. This value should be 0x01. 0x00 = No eeprom loaded 0x01 = 4K-EEPROM loaded 0x02 = 16K-EEPROM loaded
$8033B176	2 bytes	Misc.	Global	Mario hat flags
$8033B17C	4 bytes	Misc.	Global	Mario's current action
$8033B17C	4 bytes	Misc.	Global	Mario's previous action
$8033B188	2 bytes	Misc.	Global	Mario's animation phase (unsigned short int)
$8033B18A	2 bytes	Misc.	Global	Mario's animation cycle counter. Game also uses this to determine how sleepy Mario is.
$8033B218	2 bytes	Misc.	Global	Mario's current coins.
$8033B21C	1 byte	Misc.	Global	Number of beta keys
$8033B21D	1 byte	Misc.	Global	Number of lives
$8033B21E	2 bytes	Misc.	Global	Mario's power - upper byte is the value and the lower byte works like a decimal.
$8033B220	1 byte	Misc.	Global	Mario Y offset from the ground (signed char)
$8033B222	1 byte	Misc.	Global	Amount of time to apply 'hurting' effect to Mario's power
$8033B223	1 byte	Misc.	Global	Amount of time to apply 'healing' effect to Mario's power (unsigned char)
$8033B226	2 bytes	Misc.	Global	Displayed power number (signed short int)
$8033B264	2 bytes	Misc.	Global	Number for displayed stars (signed short int aka Halfword).
$8033B400	128 bytes	Misc.	Global	The segments table - Segment descriptions: 0x00 Miscellaneous, Constant 0 Graphics segments: 0x01 Master display lists? 0x02 Textures which are always available 0x03 ? 0x04 Mario graphics (geo+textures) 0x05 0x06 0x07 0x08 Object textures 0x09 Level mesh textures 0x0A 0x0B 0x0D 0x0E 0x0F General purpose segments: 0x10 0x11 0x12 0x13 Behavior script bank 0x14 Level scripts 0x15 Level scripts 0x16 Geo layouts (pre-decompression) 0x17 Geo layouts (pre-decompression) 0x18 ? (points to nothing) 0x19 Unused 0x1A Unused 0x1B Unused 0x1C Unused 0x1D Unused 0x1E Unused 0x1F Unused
$8033C600	4 bytes	Misc.	Global	Pointer to current collision triangle that mario is standing on/above
$8033D488	145920 bytes	Misc.	Global	Level object linked list - 240 slots for level object structs, each of which are 0x260 bytes. (Goombas, Toads, Signs, Mario, etc) Struct offsets: (Not completely accurate) 003 Camera relativity 004 Pointer to previous object 008 Pointer to next object 00C Pointer to ?? (some type of schema? Data has a pointer to mario's object in it) 014 Pointer to model layout script 020 X position (copy) 024 Y position (copy) 028 Z position (copy) 03C Pointer to animation data 054 X rotation 058 Y rotation 05C Z rotation 060 Pointer to an object (?) 064 Pointer to list of objects (?) 068 Pointer to ?? (self when mario's object) 070 Interaction from colliding object 074 ? 075 Object link status? 076 Collision with object status 078 Pointer to an object (?) (usually Mario's) 07C Pointer to an object (?) 0A0 X position 0A4 Y position 0A8 Z position 0AC X momentum 0B0 Y momentum 0B4 Z momentum 0F0 Model layout script case parameter 120 Segmented pointer to animation data (?) 130 Interaction 144 Interaction index (dialogue and spawn table indexes) 154 Frame counter 164 X position anchor 168 Y position anchor 16C Z position anchor 17C Model transparency 180 Interaction parameter (number of coins, damage dealt) 188 Interaction parameter ? (door warps) 19C Render distance 1C0 Pointer to level collision data that the object is standing on 1CC Pointer to behavior script (active) 1D0 Pointer to behavior script (active) 1F8 Collision sphere width 1FC Collision sphere height 20C Pointer to behavior script (initial) 21C Pointer to collision polygon 25C Pointer to model script table?
$80361150	4 bytes	Pointer	Global	Pointer to next empty object for the game to use (behavior script engine variable)
$80361158	4 bytes	Pointer	Global	Another pointer to the current Mario object (behavior script engine variable)
$80361160	4 bytes	Pointer	Global	Pointer to current object as used by the behavior processing system. All behavior ASM routines use the pointer at this address + struct offsets to make changes to level objects. Refer to the Level object linked list for a list of struct offsets.
$80361164	4 bytes	Pointer	Global	Pointer to the current behavior script command that the game is processing
$80361170	4 bytes	Misc.	Global	Current # of triangles in the collision map. (static collision + collision created by objects)
$80361178	4 bytes	Misc.	Global	Number of triangles in static collision map.
$80361184	4 bytes	Pointer	Global	Pointer to current level's water settings
$8038B8B0	240 bytes	Pointer	Global	The level script jump table; a list of pointers to level script command functions: 0x00 8037E2C4 0x01 8037E388 0x02 8037E404 0x03 8037E47C 0x04 8037E4FC 0x05 8037E580 0x06 8037E5B8 0x07 8037E620 0x08 8037E650 0x09 8037E6D4 0x0A 8037E780 0x0B 8037E7F8 0x0C 8037E878 0x0D 8037E8E8 0x0E 8037E988 0x0F 8037EA18 0x10 8037EA70 0x11 8037EA98 0x12 8037EB04 0x13 8037EB98 0x14 8037EBD4 0x15 8037EC14 0x16 8037EC54 0x17 8037ECA4 0x18 8037ECF8 0x19 8037ED48 0x1A 8037EDF8 0x1B 8037EE48 0x1C 8037EEA8 0x1D 8037EF00 0x1E 8037EF70 0x1F 8037F010 0x20 8037F130 0x21 8037F164 0x22 8037F214 0x23 8037F2A4 0x24 8037F45C 0x25 8037F36C 0x26 8037F67C 0x27 8037F994 0x28 8037F790 0x29 80380014 0x2A 8038007C 0x2B 803800BC 0x2C 80380160 0x2D 803801A0 0x2E 8037FE94 0x2F 8037FF14 0x30 80380274 0x31 8037F920 0x32 8038024C 0x33 803801E0 0x34 8037FDE4 0x35 8037FE2C 0x36 80380300 0x37 8038039C 0x38 803803EC 0x39 8037FF94 0x3A 8037FB18 0x3B 8037FC38 0x3C 80380434
$8038B9B0	220 bytes	Pointer	Global	The behavior script jump table; a list of pointers to behavior script command functions: 0x00 803854CC 0x01 8038425C 0x02 803841B8 0x03 80384224 0x04 8038438C 0x05 80384450 0x06 803844C0 0x07 80384554 0x08 803845E8 0x09 80384634 0x0A 80384188 0x0B 803841A0 0x0C 80384678 0x0D 80384C5C 0x0E 803846D0 0x0F 80384CF0 0x10 8038475C 0x11 80384D70 0x12 80384E04 0x13 803849F8 0x14 80384854 0x15 80384928 0x16 80384AB4 0x17 80384B90 0x18 8038503C 0x19 803850CC 0x1A 80385084 0x1B 80383F24 0x1C 80383F94 0x1D 80384164 0x1E 80384F8C 0x1F 80385114 0x20 803851D0 0x21 80383EE4 0x22 80383E5C 0x23 8038528C 0x24 8038546C 0x25 803842E4 0x26 803843E0 0x27 80384E9C 0x28 80384F08 0x29 803840B4 0x2A 803856A0 0x2B 803853AC 0x2C 8038401C 0x2D 80385700 0x2E 8038531C 0x2F 8038575C 0x30 8038586C 0x31 803857A0 0x32 803857E4 0x33 80385A60 0x34 80385B4C 0x35 80383EA0 0x36 803847D4 0x37 80385AF0
$8038BE28	4 bytes	Pointer	Global	Pointer to the current level script command that the game is processing.
$8038EEA0	2 bytes	Misc.	Global	Max number of triangles for collision map. 2,300 in vanilla SM64 and increased to 32,767 by the SM64 Editor. Set by function 0x80383340
$8038F800	460800 bytes	Misc.	Global	The Framebuffer. Occupies the range starting from $8038F800 to $803FFFFF. This region is constantly being overwritten, so you cannot modify any of the data directly.

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