SMW Memory Map
Displaying 25 out of 3126 addresses.
View: moderated | waiting (34)
| 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 | Misc. | Code that transfer Sprite OAM mirror (sprite OAM table at $7E0200-$7E041F, a total of 544 bytes) to register $2104 to draw sprites. | |
| $008494 | 52 bytes | Sprite tilemap related | Copies OAM's extra bits (size and 9th bit X position: %000000SX) data stored in $7E0420, and reformats, or “compacts” each 4 bytes of that into each byte to $7E0400 (%SXSXSXSX). | $0420 and $0400 format |
| $0084C8 | 8 bytes | Subroutine (JSL) | JSL wrapper for the stripe image uploader (pointer lies in $12), which can be found at $0085D2. 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.). | |
| $0085D2 | 40 bytes | Subroutine (JSR) | Subroutine which uploads the stripe image pointed by $12 to VRAM. The pointer is loaded from the table at $0084D0, and then the routine at $00871E is called. Afterwards, if $12 is #$00, the stripe image length at $7F837B is set to 0 and the terminator $FF is written to the beginning of $7F837D. In any case, $12 is reset to 0 before returning. To call this routine from outside bank 0 you can JSL to the wrapper at $0084C8. This should only be done during a blank period (usually NMI). |
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| $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. |
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| $0086C7 | 24 bytes | Subroutine (JSR) | Subroutine that initializes the OAM table in Roy, Morton and Ludwig's rooms. It first initializes the first 100 tiles to be 16x16 (by setting $0420,x to #$02), then jumps in the middle of the standard OAM clear routine (JSL $7F812E). | |
| $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 |
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| $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. | |