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SMW Memory Map
Displaying 25 out of 824 addresses. Show Waiting Addresses (36)
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RAM Address Length Type Description Details
$7E0036 2 bytes Misc. Mode 7 rotation. Its values are calculated and stored into the respective Mode 7 parameter mirrors at $7E:002E through $7E:0035.
Values #$0000 through #$01FF are all different values, after that it's the same pattern - that is, if you add this 16-bit address with #$0200, there is a 360 degree rotation.
Furthermore, this address is used in the brown chained platform code as an index to the sine and cosine tables at $07:F7DB.
$7E0038 2 bytes Misc. Mode 7 scaling; that is, making Layer 1 shrink or grow. Its values are calculated and stored into the respective Mode 7 parameter mirrors at $7E:002E through $7E:0035.
The first byte - $7E:0038 - is used for horizontal scaling, whereas the second byte - $7E:0039 - is used for vertical scaling.
Default value is #$20. The closer to #$00, the more the layer grows, the further from #$00, the more the layer shrinks. Value #$10 makes the layer twice as large as value #$20, value #$40 makes the layer twice as small as value #$20, etc.
$7E003A 2 bytes Hardware mirror Mode 7 Layer 1 X position. Mirror of SNES register $210D.
$7E003C 2 bytes Hardware mirror Mode 7 Layer 1 Y position. Mirror of SNES register $210E.
$7E003E 1 byte Hardware mirror Background mode select applied with IRQ below status bar (so the area above IRQ is not affected by this). Format: 4321pmmm.
4321 = Layer 1/2/3/4 uses 8x8 tiles when clear, 16x16 tiles when set; p = Layer 3 absolute priority (only in background mode 1); mmm = background mode # (0-7).
Mirror of SNES register $2105.
$7E003F 1 byte Hardware mirror OAM Address, low byte. Also known as the mirror of SNES register $2102. High byte is at $00846B. Is sometimes used to alter priority of various sprite tiles, such as with the sprite backgrounds in the boss rooms.
$7E0040 1 byte Hardware mirror CGADSUB settings. Format: shbo4321.
s = 0 for adding color layer, 1 for subtracting color layer; h = half-color enable; b = backdrop enable; o = object (aka sprite) enable; 4321 = enable Layer 4, 3, 2, 1 (Layer 3 is only affected below the status bar). Mirror of SNES register $2131.
$7E0041 1 byte Hardware mirror Layer 1/2 window mask settings. Format: aaaabbbb.
aaaa = Layer 2 window settings; bbbb = Layer 1 window settings. Mirror of SNES register $2123.
$7E0042 1 byte Hardware mirror Layer 3/4 window mask settings. Format: aaaabbbb.
aaaa = Layer 4 window settings; bbbb = Layer 3 window settings. Mirror of SNES register $2124.
$7E0043 1 byte Hardware mirror Object and color window settings. Format: aaaabbbb.
aaaa = color window settings; bbbb = object window settings. Mirror of SNES register $2125.
$7E0044 1 byte Hardware mirror Initial settings for color addition. Format: aabb00cd.
aa = main color window on/off; bb = sub color window on/off; c = fixed color add/subtract; d = direct color mode for 8bpp backgrounds. Mirror of SNES register $2130.
$7E0045 2 bytes Camera Column/row of Map16 tiles to use for VRAM upload when layer 1 is scrolling left/up. Its value is equal to $7E:001A (or $7E:001C if vertical) divided by #$10, minus #$08.
$7E0047 2 bytes Camera Column/row of Map16 tiles to use for VRAM upload when layer 1 is scrolling right/down. Its value is equal to $7E:001A (or $7E:001C if vertical) divided by #$10, plus #$17.
$7E0049 2 bytes Camera Column/row of Map16 tiles to use for VRAM upload when interactive layer 2 is scrolling left/up. Its value is equal to $7E:001E (or $7E:0020 if vertical) divided by #$10 (16), minus #$08.
$7E004B 2 bytes Camera Column/row of Map16 tiles to use for VRAM upload when interactive layer 2 is scrolling right/down. Its value is equal to $7E:001E (or $7E:0020 if vertical) divided by #$10, plus #$17.
$7E004D 2 bytes Camera Last X/Y value of layer 1 where VRAM upload of Map16 tiles was performed when scrolling left/up.
The low 4 bits are forced to zero (AND #$FFF0) in order to get scroll values on a 16 pixel boundary.
It is used to determine if a VRAM update is necessary during scrolling.
$7E004F 2 bytes Camera Last X/Y value of layer 1 where VRAM upload of Map16 tiles was performed when scrolling right/down.
The low 4 bits are forced to zero (AND #$FFF0) in order to get scroll values on a 16 pixel boundary.
It is used to determine if a VRAM update is necessary during scrolling.
$7E0051 2 bytes Camera Last X/Y value of interactive layer 2 where VRAM upload of Map16 tiles was performed when scrolling left/up.
The low 4 bits are forced to zero (AND #$FFF0) in order to get scroll values on a 16 pixel boundary.
It is used to determine if a VRAM update is necessary during scrolling.
$7E0053 2 bytes Camera Last X/Y value of interactive layer 2 where VRAM upload of Map16 tiles was performed when scrolling right/down.
The low 4 bits are forced to zero (AND #$FFF0) in order to get scroll values on a 16 pixel boundary.
It is used to determine if a VRAM update is necessary during scrolling.
$7E0055 1 byte Camera Direction of scrolling for Layer 1.
#$00 = left (or up); #$02 = right (or down).
Used to index the various camera tables at $7E0045 to $7E0048 and $7E004D to $7E0050.

It is also temporarily set to #$01 during level load for loading onscreen sprites.
$7E0056 1 byte Camera Direction of scrolling for Layer 2.
#$00 = left (or up); #$02 = right (or down).
Used to index the various camera tables at $7E:0049 through $7E:004C and $7E:0051 through $7E:0054.
$7E0057 1 byte Blocks Used in the level loading code. It's the position within the subscreen.
Format: yyyyxxxx, where yyyy is the Y position (units of 16 pixels) and xxxx is the X position.
$7E0058 1 byte Empty Empty. Cleared on reset, titlescreen load and overworld load.
$7E0059 1 byte Blocks Used in the level loading routine as an indicator for the size of the object, or extended object type depending on what object is being loaded. Could be used as scratch RAM (except in ObjecTool and similar codes).
$7E005A 1 byte Blocks Used in the level loading routine as the object number. Could be used as scratch RAM (except in ObjecTool and similar codes).
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