Super Mario Bros. 3/RAM map

The following article is a RAM map for Super Mario Bros. 3.

NOTES:

• All values in the table are hexadecimal unless otherwise noted.
• "Signed byte" means the value can technically be between -128..127 (80..FF, 00, 01..7F).

RAM	Purpose
0A	Temp. used to adjust main character sprite vertical position
14	Flag to return to map
15	Increased by one every game cycle. Used as timer
17	Player 1 gamepad bits.
75	On map screen vertical position. Multiples of 20, unless in boat. Also horizontal position in levels measured in units of 8 blocks wide.
77	Page counter on map screen
78	On map screen vertical position (see next RAM location description)
79	On map screen horizontal position. Multiples of 20, unless in boat. If multipaged, E0 shifts screen right, then 60, then D0, then 50. Shifting back to the left occurs at 20, then A0, then 20, then A0.
87	Vertical position measured in units of 8 blocks wide
88-??	Enemy Sprite vertical positions on screen high byte
90	Player horizontal position. Changing may cause problems in Name Table.
A2	Player vertical position in levels.
A3-??	Enemy Sprite vertical positions on screen low byte
B4	Set to C0 to kill Mario in an odd way. Sprite disappears, death music plays and returns you to world map.
BD	Player horizontal velocity (signed byte)
BE-??	Enemy Sprite horizontal velocity (signed byte)
CF	Player vertical velocity (signed byte)
D0-??	Enemy Sprite vertical velocity (signed byte)
D8	In air flag
ED	Current form (to set, use 0578): 00-Small, 01-Super, 02-Fire, 03-Raccoon, 04-Frog, 05-Tanooki, 06-Hammer
EE	Mario/Luigi Character Sprite Displayed(gets set just before display)
EF	Mario/Luigi status flag: 40 facing right, 00 facing left
F5	Controller status, new buttons pressed this frame (each bit clears to zero after initial frame)
F7	Controller status, buttons held down
0100-01FF	CPU Stack
0200-02FF	DMA transfer to sprite memory.
0376	Pause flag
03DD	P-meter in status bar. Bits 0-5 govern each arrow in turn and bit 6 is the P. (7F = all arrows alight and P blinking)
03F2	Map starman flag
03F3	Character selection on map (ED value or 7-cloud, 8-p-wing)
04F1	Sound play byte. Freeze to $00 to remove some sounds (i.e. full fly meter sound)
04F2	Sound play byte.
04F3	Sound play byte.
04F4	Fanfare play byte.
04F5	Music play byte.
04F6	Sound play byte.
04F7	Sound pause byte. 01 pauses, 02 un-pauses.
0510-0517	Various countdown timers. There's a routine at A1DC decrementing these eight timers towards 00 every frame.
0510	Countdown timer for player going in/out of pipe. Starts with 0F.
0511	Countdown timer for raccoon tail waving (repeatedly pressing jump button).
0515	Countdown timer for advancing the P-meter up or down.
0516	Countdown timer for multi-coin blocks.
051B?-051C	Countdown timers for enemy use. See remarks below. They seem to be assigned backwards, 051C is used for the first enemy to come on screen, then 051B etc.
051D	Countdown timer for powerups rising animation. If set to nonzero value will make the powerup rise again(!) wherever it is on screen.
0525	Countdown timer for bounce block sprite (like ? when hit).
0545	Level start entrance effect. 0-normal, 1-slide, 2-pipe upwaard, 3-pipe downward, 4-pipe from right, 5-pipe from left, 6-jump on anchor of ship, 7-scroll right and down
0552	Timer that is set after player is hit. Determine how long you flash (are invincible)
0553	Timer for star mario
0554	Timer for change suit poof effect (set value is 17 (or 11 hex?))
0559	Set to FF for auto-control of player character
055A	Auto-control mode. 0-normal, 1-run under ship, 2-jump on ship, 3-grab anchor, 4-screen scroll right and down for ship, 6-screen scrolls fast right
055C	Mario's velocity; 4 bits precision for 1/256th of a pixel
055D	8 frame timer. Resets at the beginning of a level.
0567	Timer for P-Block
056E	Timer that determines how long flight will last. Power Meter instantly empties when this hits zero. Setting to FF enables unlimited flight.
056F	Ducking flag; Set to $FF for squat-float effect
0570	Number of frames ducking on white block
0575	Swimming flag
0577	Indicates whether Mario currently has Kuribos boot. (00=No, 01=Yes)
0578	Change Mario form. Modes 1-7 can be changed at will (same as ED value+1). Flag-like values combine with ANY mode (so you can get e.g. small Mario in statue form). Modes: 01=small, 02=big, 03=fire, 04=raccoon, 05=frog, 06=tanooki, 07=hammer. Flags: 10=Enable statue, 40=Enable swimming (causes splash on land), 80=Enable Kuribos boot. No idea how to CLEAR the flags, probably not possible here.
057A	Enable statue mario characteristic (gray & invincible, note: can't go down pipes with this characteristic enabled)
057B	Indicates flight? Has the value 1 when P-meter is full AND player is jumping. Used at least for locking 0515 and thus the P-meter while in flight.
057C	PrizeBoxCode
0584	Underwater / not underwater selection
0585	(??) Set to $FF to slide "right" (not left) through solid objects
0588	Timer for "Backstage" status
05EE-05F0	Time remaining
05F3	Freeze timer if set to 01
05F4	Stomp counter
0669	The item you'll get from a toad house
066F	Card selection for the flashing card that you jump to get
0715-0717	current player score divided by dec10. (max F423F[dec999,999]) (There's a hard coded 0 in the score display)
0727	World number - 1
0736	Mario # of Lives (max 63[dec99])
0737	Luigi # of Lives
0746	Mario's Form that he will start next level as. When the level is loaded this value gets transferred to 00ED.
0747	For Luigi; See 0746.
074D	Horzontal subpixel position. (1/16 of a pixel)
075F	Vertical subpixel position. (1/16 of a pixel)
0781	RNG. 72 bits LFSR.
6000-794F	Active level data.
7976	Map screen Y position for the current level Mario is in.
7977	Map screen Y position for the current level Luigi is in.
7978	Map screen X position (high byte) for the current level Mario is in.
7979	Map screen X position (high byte) for the current level Luigi is in.
797A	Map screen X position (low byte) for the current level Mario is in.
797B	Map screen X position (low byte) for the current level Luigi is in.
797E	Map screen Y position to return to when Mario dies.
797F	Map screen Y position to return to when Luigi dies.
7980	Map screen X position (high byte) to return to when Mario dies.
7981	Map screen X position (high byte) to return to when Luigi dies.
7982	Map screen X position (low byte) to return to when Mario dies.
7983	Map screen X position (low byte) to return to when Luigi dies.
7B40-7B??	Enemy data for the current level.
7D00-7D3F	Mario's level complete flags.
7D40-7D7F	Luigi's level complete flags.
7D80-7D9B	Each Byte Represents an Item that Mario is Carrying (Pressing 'B' while at Map Screen): 00-No Item, 01-Mushroom, 02-Flower, 03-Leaf, 04-Frog, 05-Bear, 06-Hammer Bro Suit, 07-Cloud, 08-P-Wing, 09-Star, 0A-Anchor, 0B-Hammer, 0C-Whistle, 0D-Music Box. 0E and above will most likely crash the game, not completely tested though.
7D9C-7D9E	Each Byte Represents a reward card Mario has 00-No Item, 01-Mushroom, 02-Flower, 03-Star
7D9F-7DA1	Storage for Mario Score (/dec10)
7DA2	# of coins Mario has
7DA3-7DBE	Each Byte Represents an Item that Luigi is Carrying (Pressing 'B' while at Map Screen): 00-No Item, 01-Mushroom, 02-Flower, 03-Leaf, 04-Frog, 05-Bear, 06-Hammer Bro Suit, 07-Cloud, 08-P-Wing, 09-Star, 0A-Anchor, 0B-Hammer, 0C-Whistle, 0D-Music Box. 0E and above will most likely crash the game, not completely tested though.
7DBF-7DC1	Each Byte Represents a reward card Luigi has 00-No Item, 01-Mushroom, 02-Flower, 03-Star
7DC2-7DC4	Storage for Luigi Score(/dec10)
7DC5	# of coins Luigi has
A648	(C8) Initial velocity for player jump.
ACA2	(05) Mario falling gravity, added to Y vel each frame.
ACA6	(E0) Default upward velocity for jumps. Modified by a table value subtracted from this, see Notes.
ACB3	(01) Mario jump gravity, added to Y vel each frame while jump in progress.
BFCC	Routine that clamps 00CF (Mario Y velocity) to the maximum ($45) when falling.

Note: Some addresses above are in the PRG ROM range, should probably be moved to the ROM map.

Enemy timers at 051B-051C:

• Piranha plants use these to toggle being up/down. E.g. when inside the pipe, set to 01 to force the plant coming up next frame.