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SMW Memory Map
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ROM Address Length Type Description Details
$008000 39 bytes ASM This is the starting address of SMW. This takes care of basic initialization such as disabling IRQ, HDMA, DMA, clearing the SPC ports, enabling F-blank, disabling emulation mode, disabling decimal mode, initializing the direct page, and setting up the stack.
$008027 43 bytes ASM This is code is responsible for uploading the OAM clear routine to $7F8000. The uploaded routine is essentially an unrolled loop which stores #$F0 to all of the OAM mirror($0200) Y positions.
$008052 25 bytes ASM This is the main part of the SMW initialization routine. SPC engine upload, sample upload, OAM setup, windowing setup, and RAM clearing all happens here.
$00806B 14 bytes ASM This is the main game loop of SMW. It is used to wait for V-blank to complete before executing the code of the next frame. One of the frame counters ($13) is also incremented here.
$00810E 15 bytes Subroutine (JSR) OW Music uploader.
$008134 37 bytes Subroutine (JSR) Uploads level music bank.
$008159 17 bytes Subroutine (JSR) Credit music uploader.
$00816A 522 bytes Misc. SMW's NMI routine. For more information, see here.
$008179 49 bytes ASM Handles transfers to and from the SPC700 (I/O). Changing all values to [EA] (NOP) or jumping over the code effectively mutes all sound.
$008293 1 byte Misc. How many scanlines the status bar uses during a regular level.
$00835D 1 byte Layer 3 How many scanlines the status bar uses during the battles with Bowser, Ludwig, and Reznor.
$008370 1 byte Layer 3 How many scanlines the status bar and ceiling use during the battles with Morton and Roy.
$008374 162 bytes Misc. SMW's IRQ routine.
$008449 44 bytes Sprite Misc. Code that transfer Sprite OAM mirror to register $2104 to draw sprites.
$0084C8 8 bytes Subroutine (JSL) Wrapper for the stripe image uploader (pointer lies in $12). Because it upload tiles, it must run in either f- or v-blank (e.g. in NMI).
$0084D0 258 bytes Stripe Image Stripe image pointer table. Each 24-bit pointer here corresponds to a value of $12, but only multiples of 3 are used. (The first pointer is for value 00, the second is for value 03, the third for 06, etc.)
$0085FA 86 bytes Subroutine (JSR) Fills the entire layer 3 tilemap with tile 0x0FC (transparent tile) i.e. the code "empties" it. Also wipes the OAM before returning.
$008650 119 bytes Subroutine (JSR) This is the routine that polls the controller and updates $15, $16, $17, $18.
$0086A0 (x8A0) - Change to [9C A0 0D AD A0 0D A2 00] to cause both player 1 & 2 to be controlled by controller 1.
$0086DF 27 bytes Subroutine (JSL) Pointer subroutine: Jump to a 2-byte pointer, the position of the pointer used is "Position after the JSL + 1 + (A*2)". The subroutine should always be accessed by a JSL.
$0086FA 36 bytes Subroutine (JSL) Pointer subroutine: Jump to a 3-byte pointer, the position of the pointer used is "Position after the JSL + 1 + (A*3)". The subroutine should always be accessed by a JSL.
$00871E 143 bytes Stripe Image Stripe Image Uploader. Uses $00-$02 as a 24-bit pointer to tile data. See this thread how the stripe image format works. Must be run during a blank, usually NMI.

To call from a custom routine, do this:
- Store stripe image pointer (24-bit) to $00-$02
- Push 24-bit return address (bank -> mid -> lo)
- PHB : LDA #$00 : PHA : PLB
- PEA $84CD
- JSL $00871E
$0087AD 617 bytes Subroutine (JSL) This routine is the DMA routine in charge of updating layers one and two as needed. This is controlled by the addresses $1BE4 and $1CE6 when they are a non-zero value.
$008A4E 43 bytes Subroutine (JSR) Clear RAM subroutine. This is part of the reset routine.
$008A79 59 bytes ASM The routine that sets up certain VRAM-related registers in normal levels.
- $008A80: Default value for $2107 [23].
- $008A85: Default value for $2108 [33].
- $008A8A: Default value for $2109 [53].
- $008A8F: Default value for $210B [00].
- $008A94: Default value for $210C [04].
- $008AAB: Default value for $2130 [02], although it's actually stored to the mirror here (i.e. $44).
$210A is never set, since it is only ever used in Mode 0.
$008C59 40 bytes Layer 3 Tile array for numbers in bonus star counter.
$008C81 126 bytes Layer 3 Default status bar tiles info table. Format for each 8x8 tile:
%TTTTTTTT %YXPCCCTT

*$008C81-$008C88: top line of status bar (4 top tiles of the item box)
*$008C89-$008CC0: Second line of status bar
*$008CC1-$008CF6: Third line of status bar
*$008CF7-$008CFE: bottom line of status bar (4 bottom tiles of item box)
Table of addresses
$008D8B 1 byte Timer Timer speed (USE WITH $008E2E)
$008D90 28 bytes Misc. These four tables indicate the DMA settings and the source address to use for the status bar tiles (the ones that are uploaded at the very beginning of the level). The tables get stored in the order of $43x0-$43x6.
$008DAC 59 bytes Layer 3 The routine that draws the status bar onto the screen. It uses DMA to write the Layer 3 tiles to VRAM.
$008DF5 5 bytes Layer 3 The tiles that make up Luigi's name in the status bar.
$008DFA 4 bytes Sprite tilemap related Tilemap of reserve item. First byte is mushroom, second is flower, third is star, fourth is feather.
$008DFE 4 bytes Sprite tilemap related YXPPCCCT of stars in the item box. It cycles between the four entries every second frame.
$008E02 4 bytes Sprite tilemap related YXPPCCCT data for reserve item. First byte is mushroom, second is flower, third is bypassed ($008DFF), fourth is feather.
$008E06 20 bytes Layer 3 Bonus star counter tilemap - 2 bytes for each number. Every first byte is for the upper tile, every second byte for the bottom tile.
$008E1A 480 bytes Layer 3 The routine that updates the values of all the addresses used for the status bar ($0EF9-$0F2F).
$008E28 - Change this address to AD to disable the timer.
$008E2E - Timer speed (USE WITH $008D8B)
$008E5C - Time is Running Out SFX. Change from FF to 00 to stop the music from speeding up when time reaches 99.
$008E6B - [22 06 F6 00] Change to [EA EA EA EA] to not kill Mario when the timer reaches zero. The timer will count down normally and stop at zero, but Mario will not die
$008EDB - Change this and/or $008F09 from 20 12 90 to EA EA EA to disable writing the score to the status bar when playing as Mario and/or Luigi, respectively. Useful if you want to place another counter in place of the score using Smallhacker's Status Bar Editor. Note: This alone will NOT stop writing blank tiles if the first N tiles/bytes at $0F29-$0F2E contains the value #$00 (the "0" graphic). To prevent that, consider using this patch.
$008EE3 - Change to BRA [80] to write zeroes instead of blank tiles to Mario's score counter. Use with $008F11.
$008F11 - Change to BRA [80] to write zeroes instead of blank tiles to Luigi's score counter. Use with $008EE3.
$008F2C - How many coins you need to get an 1up (USE WITH $008F37)
$008F2F - [EE E4 18] Change to [EA EA EA] to not gain a life after collecting enough for one.
$008F37 - Number of coins to subtract from the counter when you gain enough for a 1up (Default: $64 (100). Change to [01] to create a coin wallet effect - use with $008F2F.
$008F41 - (Use with $008F45) Maximum life limit, minus one. Warning: Changing this to anything higher than 0x7E (127 lives) will remove the life limit entirely! Also, if you have more than
99 lives, the life counter will appear slightly glitched.
$008F45 - (Use with $008F41) Maximum life limit, minus one. Note that if you have more than 99 lives, the life counter will appear slightly glitched.
$008F62 - Number of bonus stars required to enter bonus game
$008F67 - [8D 25 14] Change to EA EA EA to disable entering bonus game when player has 100 bonus stars.
$008F6F - Amount of bonus stars that will be subtracted when 100 bonus stars are collected. Change to [01] to make 99 the maximum amount of bonus stars you can get - to create a bonus star wallet effect, use with $008F67.
$008F7E - Writes coins to status bar. Changing to [EA EA EA EA EA EA] will disable the coins from being written to the status bar.
$008F95 - [09] The X position of the small bonus star counter in the status bar.
$008FC5 - [20 79 90] Change to EA EA EA to disable the item GFX in the status bar
$008FCE - Length of "LUIGI" text (Status bar)
$008FE7 - [FC](blank tile) Tile used on the status bar when there's no Yoshi coin in that spot.
$008FED - [2E](coin tile) Tile used on the status bar when there is a Yoshi coin in that spot. Change to [FC](blank tile) to visually disable collected Yoshi Coins.
$008F1D 30 bytes Misc. Routine that handles actually increasing the player's coin count and giving a life from 100 coins, controlled by RAM address $7E13CC.
$008FDC 1 byte Layer 3 [05] If the player has collected at least this number of Dragon Coins, the status bar will display $008FE0 Dragon Coins instead (none by default).
$008FE0 1 byte Layer 3 [00] Number of Dragon Coins to display in the status bar, if the player has collected at least 5.
$008FF0 2 bytes Layer 3 Location of the first Dragon Coin tile in the status bar. Diagram
$008FFA 24 bytes Misc. Powers of 10 table for 6-digit* HexToDec routine at $009012 used to display the player's score. Note: These are 16-bit words, but are handled as 32-bit subtraction for the low and high words individually.

*SMW displays the score as 7 digits, but the score is actually a 6-digit (decimal) number stored internally, the 7th digit "0" is a static tile not part of this number.
16-bit values
$009012 51 bytes Sprite subroutine (JSR) 6-digit* HexToDec subroutine to write a player's score into status bar.

Call with Y = #$00, X as the position to write to on the status bar (standard is #$14), and $00-$03 as the score to write (in hexadecimal). Note that this routine does not remove leading 0s; that is handled at $008EDE and $008F0C.

Works like this: count how many subtractions by 10n (with n=5) without the difference going into the negatives; that number of subtractions is the digit for the 10ns place. Then repeat but with 10n-1. This is the "left-to-right" version of base conversion using repeated subtraction to emulate the 32-bit division by 10n.

*SMW displays the score as 7 digits, but the score is actually a 6-digit (decimal) number stored internally, the 7th digit "0" is a static tile not part of this number.
$009045 12 bytes Subroutine (JSR) The hexadecimal to decimal subroutine (in short HexToDec) which converts a hexadecimal 8-bit value into a decimal string. To use for JSL, use JSL $00974C instead.

Input:
-A: 8-bit value to convert
Output:
-A: 1s digit (calculated via repeated subtraction until < 10; “modulo” by 10)
-X: 10s digit (calculated via how many subtraction until A < 10; “quotient” division by 10)
$009051 40 bytes Subroutine (JSR) Bonus stars (small 8x8 digits) HexToDec routine. Unknown why Nintendo didn't decide to use $009045 instead, since the bonus stars are 8-bit and other digits are also 8-bit and they use $009045.

Note: this routine alone produces mere 1s and 10s place, so the numbers will be 8x8 instead of 8x16. The code at $008FAF will convert the digits to tile numbers of 8x16 digit graphics.
$009053 3 bytes Layer 3 Change to EAEAEA to get rid of the small bonus stars. Use in conjunction with address $00:9068
$009068 3 bytes Layer 3 Change to EAEAEA to get rid of the small bonus stars. Use in conjunction with address $00:9053
$009079 88 bytes Layer 3 Subroutine that draws the power up item to the item box on the status bar during levels.
$0090AE is the X position of the Item Box item.
$0090B3 is the Y position of the Item Box item.
Note: Those two positions are only graphical. It won't change where the item drops from when select is pressed.
$0090D1 104 bytes Sprite tilemap related Tile numbers for 'MARIO START' and various similar messages.
$0090EE is for the top half of Time Up.
$009122 is for the bottom half of Time Up.
$009139 98 bytes Sprite tilemap related YXPPCCCT properties for 'MARIO START' and various similar messages.
Change $00913F from 30 to 34 and $009170 from F0 to F4 to fix the S in "Mario/Luigi Start".
$009156 is for the top half of 'TIME UP".
$0091AC 1 byte Misc. Number of coins needed to get an 1up from the green star block.
$0091DB 1 byte ASM Change it to D0 to switch the "Mario/Luigi Start"
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