YI Memory Map - SMW Central

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Time: 2019-10-14 01:32:39 AM

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Tip: Try not to place secret exits at the very end of levels-- the player will basically have to go through the same level twice.

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SRAM Address	Length	Type	Description	Details
$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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