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SMW Memory Map
Displaying 25 out of 824 addresses. Show Waiting Addresses (3)
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RAM Address Length Type Description Details
$7E0000 16 bytes Misc. Scratch RAM, is and can be used for a big number of purposes. The general purpose is temporarily preserving a value for later use in a routine.
Of note is the following address, used in LM ASM hacks:
$7E:0003 (16-bit) - Block number from LM Map16 editor. Also used in the custom Map16 tile change routine.
$7E0010 1 byte Flag If the value in it is not zero, run the actual game; otherwise, loop forever. It's set to a non-zero value during NMI, and it's set to zero after the game mode has been run, so that the game runs exactly once a frame - one NMI trigger per frame.
$7E0011 1 byte Flag Used to distinguish IRQ #1 from IRQ #2's code. (Inside the Morton/Ludwig/Roy room, where IRQ is used twice, although it can be used in other areas that run IRQ as well.) #$00 = IRQ #1; #$01 = IRQ #2.
$7E0012 1 byte Graphics Stripe image loader - value must be divisible by 3.
A list of valid values can be found here.
Valid Values
$7E0013 1 byte Counter "True" frame counter. Increments once per frame, except when the game is lagging. Note that $7E:0014 is better suited for most purposes.
$7E0014 1 byte Counter "Effective" frame counter. Stops when, for example, RAM addresses such as $7E:009D are not zero (lock sprite flag, usually indicates the player is dying, grabbing a powerup, or something similar). Inside sprite code, this address is often preferred over $7E:0013, especially in graphics routines, as graphics will not be updated when the player dies if this address is used as an index to the tilemap.
$7E0015 1 byte I/O Controller buttons currently held down. Format: byetUDLR.
b = A or B; y = X or Y; e = select; t = Start; U = up; D = down; L = left, R = right.
$7E0016 1 byte I/O Controller buttons newly pressed this frame. Format: byetUDLR.
b = B only; y = X or Y; e = select; t = Start; U = up; D = down; L = left, R = right.
$7E0017 1 byte I/O Controller buttons currently held down. Format: axlr----.
a = A; x = X; l = L; r = R, - = null/unused.
$7E0018 1 byte I/O Controller buttons newly pressed this frame. Format: axlr----.
a = A; x = X; l = L; r = R, - = null/unused.
$7E0019 1 byte Player Player powerup/status. #$00 = small; #$01 = big; #$02 = cape; #$03 = fire.
$7E001A 2 bytes Hardware mirror Layer 1 X position, current frame. Mirror of SNES register $210D.
$7E001C 2 bytes Hardware mirror Layer 1 Y position, current frame. Mirror of SNES register $210E.
$7E001E 2 bytes Hardware mirror Layer 2 X position, current frame. Mirror of SNES register $210F.
$7E0020 2 bytes Hardware mirror Layer 2 Y position, current frame. Mirror of SNES register $2110.
$7E0022 2 bytes Hardware mirror Layer 3 X position. Mirror of SNES register $2111.
$7E0024 2 bytes Hardware mirror Layer 3 Y position. Mirror of SNES register $2112.
$7E0026 2 bytes Misc. Depending on Layer 3 tides being activated or not, it's either:

Not activated:
Layer 2 X position minus Layer 1 X position.
Activated:
Layer 3 X position minus Layer 1 X position.

Used for various things, among which interaction with multiple layers is included.
$7E0028 2 bytes Misc. Depending on Layer 3 tides being activated or not, it's either:

Not activated:
Layer 2 Y position minus Layer 1 Y position.
Activated:
Layer 3 Y position minus Layer 1 Y position.

Used for various things, among which interaction with multiple layers is included.
$7E002A 2 bytes Hardware mirror Mode 7 Center X position. Mirror of SNES register $211F, + #$0080.
$7E002C 2 bytes Hardware mirror Mode 7 Center Y position. Mirror of SNES register $2120, + #$0080.
$7E002E 2 bytes Hardware mirror Mode 7 matrix parameter A. Mirror of SNES register $211B.
$7E0030 2 bytes Hardware mirror Mode 7 matrix parameter B. Mirror of SNES register $211C.
$7E0032 2 bytes Hardware mirror Mode 7 matrix parameter C. Mirror of SNES register $211D.
$7E0034 2 bytes Hardware mirror Mode 7 matrix parameter D. Mirror of SNES register $211E.
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