YI Memory Map
Displaying 36 out of 286 addresses.
View: moderated | waiting (27)
| 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 |
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| $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: ??? |
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| $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 |
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| $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 |
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| $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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