YI Memory Map - SMW Central

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SRAM Address	Length	Type	Description	Details
$701E40	2 bytes	Misc.	Current "angle" of the pseudo-3D platforms (e.g. falling walls, rolling logs) currently being processed.
$701E42	2 bytes	Misc.	X position of the pseudo-3D platform (e.g. falling walls, rolling logs) currently being processed + 8.
$701E48	2 bytes	Misc.	$0000: Baby Mario is on Yoshi's back, $FFFF: not
$701E4A	2 bytes	Sprite Number	Overwrite ambient sprite slot # ($0000~$003C) to use when spawning an ambient and the tables are full, spawn at this slot - 4 (if < 0, wraparound to $003C)
$701ECC	2 bytes	Super FX	Dynamic Super FX graphics tiles ($5C00-$5D00 VRAM) currently used/reserved, each bit corresponds to a 16x16 chunk within the full space, 1 means currently used, 0 means free Each nibble of this word corresponds to a 32x32 piece, and then row-major starting at top left, so the full thing is %1234123412341234 where: 1 = top left 2 = top right 3 = bottom left 4 = bottom right
$701ECE	32 bytes	Super FX	Sprites' dynamic Super FX graphics reserved chunks, 16 word-sized entries, each one represents which 16x16 chunks of graphics that a particular sprite personally has reserved for it, follows same format as $701ECC, acts as a mask so all 0 bits means this sprite is not using that chunk, the dynamic tile index indexes into this
$701EEE	2 bytes	Misc.	Camera X offset value during Offset-Per-Tile mode
$701EF0	2 bytes	Misc.	Camera Y offset value during Offset-Per-Tile mode
$701EF2	64 bytes	Misc.	Offset per tile mode X offsets: 32 word-sized X offsets, one per screen 8-pixel row, starting at top of screen
$701F32	64 bytes	Misc.	Offset per tile mode Y offsets: 32 word-sized Y offsets, one per screen 8-pixel column, starting at left side of screen
$701F72	80 bytes	Layer 1 Tilemap	Effects table for wavy BG1 (like in 6-4 log ride lava), 20 4-byte entries, each entry represents a rectangle in the map which triggers the wavy effect: Byte 1: Leftmost X tile (all coordinates and sizes are 16 pixel tile regions of the entire area) of rectangle Byte 2: Topmost Y tile Byte 3: Width of rectangle - 1 Byte 4: Height - 1 NOTE: when triggered, X will be per-column but Y will activate for the entire height of the screen
$701FE8	2 bytes	Timer	Timer for fuzzy dizzy effect, starts at $400
$701FEA	2 bytes	Player Physics	Cross section state, in conjunction with cross section flag: Upon entering: $0001: overlay fade out $0002: does nothing $0003: does nothing $0004: palette fading (unused?) $0005: done $0006: unused $0007: unused Upon leaving: $0001: does nothing $0002: palette fading (unused?) $0003: copy BG1 left tilemap $0004: copy BG1 right tilemap $0005: dump to BG3 $0006: overlay fade in $0007: done
$701FEC	2 bytes	Flag	Inside cross section: $0000: not inside, $0002: inside
$702000	512 bytes	Misc.	CGRAM mirror table (palettes)
$702200	1024 bytes	Misc.	Lookup table for function y = 1/x, mirrors $00E552-$00E951 Used by GSU to divide. It does not have a hardware divide so this lookup table is used instead.
$702600	3 bytes	Misc.	Pointer to sprite level data for current level
$702604	32 bytes	Misc.	Newly spawned column of BG3 cross section tiles, SNES VRAM tilemap format ($01CE = blank tile)
$702624	32 bytes	Misc.	Mirror of $702604
$702644	64 bytes	Misc.	Newly spawned row of BG3 cross section tiles, SNES VRAM tilemap format ($01CE = blank tile)
$7027CE	252 bytes	Misc.	Newly spawned sprites this frame, up to 31 8-byte entries, with 4 bytes extra for a possible "end marker" (first word being negative indicates to go no further in the table): Word 1: Sprite ID (gets put into $701360) Word 2: X coordinate Word 3: Y coordinate Word 4: Stage ID, background layer, sprite priority (gets put into $7014A0)
$7028CA	256 bytes	Misc.	Stage sprites' spawning flags, 1-byte entries indexed by their stage ID ($00-$FF, same as in $7014A0 table): $00: Not spawned in currently, ready to spawn when column/row is reached $FF: Do not spawn: this either means the sprite is currently spawned in or is destroyed like enemy swallowed
$7029CA	2 bytes	Misc.	Pointer into next free entry of $7029CC table
$7029CC	928 bytes	Misc.	Sprite interactive terrain buffer - mostly used for sprites that break sand, each sprite has 5 entries representing left, right, center, top, and bottom; room for up to 23 sprites, plus one additional entry; 8-byte entries: Word 1: X coordinate Word 2: Y coordinate Word 3: ??? Word 4: ???
$703372	420 bytes	Misc.	HDMA BG Scroll Buffer, gets copied to $7E5040
$703516	420 bytes	Misc.	HDMA BG Scroll Buffer, gets copied to $7E51E4
$703A02	840 bytes	Misc.	Window 1 & 2 (registers $2126-$2129) Buffer, gets copied to $7E56D0
$704070	2 bytes	Misc.	Current message box data index
$70409E	1024 bytes	Misc.	Table of MAP16 indices that represents the currently loaded two BG1 foreground tiles (two screens side by side, even & odd x-wise), orientation is based on scroll values
$70449E	120 bytes	Misc.	Offset per tile moving object table, 20 6-byte entries, each entry represents a rectangle in the map which triggers an OPT effect that oscillates up & down (like 6-4 moving platforms): Byte 1: Leftmost X tile of rectangle (all coordinates and sizes are 8 pixel tile coords) Byte 2: Topmost Y tile Byte 3: Width of rectangle - 1 Byte 4: Height - 1 Byte 5: Amplitude of oscillation: # of pixels the object travels both up and down from its normal position in stage, this value is signed which indicates initial movement direction Byte 6: Current offset of object NOTE: when triggered, X will be per-column but Y will activate for the entire height of the screen
$705800	8192 bytes	Misc.	Buffer used for decompressed file destination/pixel plotting destination; varies in size but up to 8kb
$707800	1024 bytes	Misc.	Practically free SRAM Only cleared on boot and all scenes with Island graphics
$707C00	2 bytes	Misc.	Save file 1: # of lives (from last save)
$707C02	1 byte	Misc.	Save file 1: Last level beaten
$707C03	72 bytes	Misc.	Save file 1: Level high scores, 1 byte per map tile, format: csssssss, c = level completed, s = high score
$707C4B	27 bytes	Misc.	Save file 1: Pause menu items, 1 byte per item, same format as $7E0357
$707C66	1 byte	Misc.	Save file 1: Controller settings, same format as $700082
$707C67	1 byte	Misc.	Save file 1: Tutorial message box bitflags, same format as $7E0372
$707C68	2 bytes	Misc.	Save file 2: # of lives (from last save)
$707C6A	1 byte	Misc.	Save file 2: Last level beaten
$707C6B	72 bytes	Misc.	Save file 2: Level high scores, 1 byte per map tile, format: csssssss, c = level completed, s = high score
$707CB3	27 bytes	Misc.	Save file 2: Pause menu items, 1 byte per item, same format as $7E0357
$707CCE	1 byte	Misc.	Save file 2: Controller settings, same format as $700082
$707CCF	1 byte	Misc.	Save file 2: Tutorial message box bitflags, same format as $7E0372
$707CD0	2 bytes	Misc.	Save file 3: # of lives (from last save)
$707CD2	1 byte	Misc.	Save file 3: Last level beaten
$707CD3	72 bytes	Misc.	Save file 3: Level high scores, 1 byte per map tile, format: csssssss, c = level completed, s = high score
$707D1B	27 bytes	Misc.	Save file 3: Pause menu items, 1 byte per item, same format as $7E0357
$707D36	1 byte	Misc.	Save file 3: Controller settings, same format as $700082
$707D37	1 byte	Misc.	Save file 3: Tutorial message box bitflags, same format as $7E0372
$707D38	104 bytes	Misc.	Backup of save file 1
$707DA0	104 bytes	Misc.	Backup of save file 2
$707E08	104 bytes	Misc.	Backup of save file 3
$707E70	6 bytes	Misc.	Save file checksums: 2-byte ($7777 - checksum) of save files 1, 2, then 3
$707E76	6 bytes	Misc.	Backup save file checksums: 2-byte ($7777 - checksum) of backup save files 1, 2, then 3
$707E7C	2 bytes	Misc.	Current / most recent save file loaded in ($0000, $0001, $0002)
$707E7E	386 bytes	Misc.	Unused battery backed up Save RAM Won't get cleared or changed

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