Arcana/RAM map

The following article is a RAM map for Arcana.

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The list corresponds to RAM variables used by the game engine. They are generally accessed by LDA and STA instructions.

Battle

$0624-$0626: Active spirit's HP (Format: BCD)
$062D: Offset*2 used with $11F3
$0643-065x: Enemies in battle (Enemy ID + 18), set to FFFF when killed
$09D3-DA: Item/Spell/Enemy chosen (Items: 00-??) (Spells: 00-0C) (Enemy target: 14, 16, 18, 1A, 1C) (Party target: 00, 01, 02, 03) (Rooks $D3-D4, Spirit $D5-D6, Guest1 $D7-D8, Guest2 $D9-DA)
$09ED: Whose turn is it (Allies 0-3, enemies 4+) (May have other uses)
$0A15: Offset for treasure chest opened
$0A87-$0A8E: Current selected battle command (2 bytes per character)
- #$0001: Main menu
- #$0003: Items/Magic
- #$0004: Cards
- #$0005: Weapons
- #$0007: Attack
$1049: Code pointer
$1064: Current music
$1066: Current sfx
$11C3: Party condition (a series of words in the order: Rooks, Spirit, Guest1, Guest2, Enemies 1-8)
- Odd byte:
  - #$00: Satisfactory
  - #$01: Deceased
  - #$02: Not Here
  - #$03: Paralyzed
  - #$04: Petrified
  - #$05: Confused
  - #$06: Sleeping
- Even byte: #$01 indicates a party member
$11F3-11FA: Order that spells hit the party (2 bytes per character)
- #$0000: Upper left
- #$0001: Upper right
- #$0002: Lower left
- #$0003: Lower right

$120B: Rooks' Element/Race
$120D: Spirit's Element/Race
$120F: Guest1's Element/Race
$1212: Guest2's Element/Race
$1214: Enemy1's Element/Race
- Bytes continue with Enemy2-8 in order
$1223: Rooks' Strength
$1225: Spirit's Strength
$1227: Guest1's Strength
$1229: Guest2's Strength
$122B: Enemy1's Strength (table offset?)
- Bytes continue with Enemy2-8 in order
$123B: Rooks' Intelligence (reduces magic damage taken)
$123D: Spirit's Intelligence
$123F: Guest1's Intelligence
$1241: Guest2's Intelligence
$1243: Monsters' Intelligence (affects spell damage)
- Bytes continue with Enemy2-8 in order
$1253: Rooks' Endurance (reduces physical damage taken)
$1255: Spirit's Endurance
$1257: Guest1's Endurance
$1259: Guest2's Endurance
$125B: Enemy1's Endurance
- Bytes continue with Enemy2-8 in order
$126B: Rooks' Alertness (affects accuracy, evasion and critical hits)
$126D: Spirit's Alertness
$126F: Guest1's Alertness
$1271: Guest2's Alertness
$1273: Enemy1's Alertness
- Bytes continue with Enemy2-8 in order

$12F3: HP, Rooks
$12F5: HP, Spirit
$12F7: HP, Guest1
$12F9: HP, Guest2
$12FB: HP, Enemy1
- Bytes continue with Enemy2-8 in order
$1323: MP, Rooks
$1325: MP, Spirit
$1327: MP, Guest1
$1329: MP, Guest2
$132B: MP, Enemy1
- Bytes continue with Enemy2-8 in order
$1393: Max HP, Rooks
$1395: Max HP, Spirit
$1397: Max HP, Guest1
$1399: Max HP, Guest2
- (Next byte is Rooks' Max HP -> Enemies have no max HP/MP stat)
$139B: Max MP, Rooks
$139D: Max MP, Spirit
$139F: Max MP, Guest1
$13A1: Max MP, Guest2
$13A9: Card inventory (Two bytes each, eight entries)
- (item ID / quantity)
$13B9: Item inventory (Two bytes each, 48 entries)
- (item ID / quantity)
$1419: Equipment inventory (Two bytes each, 48 entries)
- (item ID / quantity)
$1459: Rooks' spell list (Two bytes each, 32 entries)
$1499: Spirit's spell list (Two bytes each, 32 entries?)
$14D9: Guest1's spell list (Two bytes each, 32 entries?)
$1519: Guest2's spell list (Two bytes each, 32 entries?)
$1559: Current GP
$155B: Current party (Two bytes each)
- #$00: Rooks
- #$01: Sylph
- #$02: Marid
- #$03: Dao
- #$04: Efrite
- #$05: Teefa
- #$06: Salah
- #$07: Darwin
- #$08: Axs
- #$09: (Empty slot)

$1573: ?? (Checked before changing music)
$1577: Window color (Bit depth: 0BBB B0GG GG0R RRR0)
$1579: Encounter related
$157B: Graphics related
$1580-16DF: Current display
- For spells, names are preceded by 06 0D (white) if usable and 06 0E (grayed) if not.
$16DB: Temp var (Attack power, battle damage, )
$16DD: Temp var (Defense power)
$16F3: #$01 if in motion, #$00 if standing still
$16F5: Related to random encounters
$16F7: Dungeon X position
$16F9: Dungeon Y position
$16FB: Current direction (#$00 North, #$02 East, #$04 South, #$06 West)
$16FD: Related to random encounters (usually 0)
$16FF: Suspected dungeon progress
$17BF: Suspected dungeon progress
$18CD: Current Chapter # (01-05)
$18DA: Pointer used for encounters?
$18E3-$18E8: Treasure chest flags (each chest has its own bit)
$1E10: Pointer to current data being processed ([10])