Dragon Warrior/RAM map

The following article is a RAM map for Dragon Warrior.

This page is rather stubbly and could use some expansion. Are you a bad enough dude to rescue this article?

Main

RAM	Function	Details
0x000E	Unused
0x0011	Map horizontal offset	Modifying this offset seems to shift map tiles horizontally?
0x0012	Map load information	Modifying this causes other maps to load entirely, but does not impact NPCs
0x0013-14	Tiles, linked	Both bytes are always the same and differ on each map. Setting the bytes to 9 will cause the world map to become entirely water.
0x0015	Exterior Tile	Changing this changes the tile that is displayed on the border of maps. 0 is grass, 15 is water, 16 in caves, 21 in the throne room
0x0016	Terrain Offset	$20 for caves, $10 for most towns, $00 for world map. The game uses this to determine which slate of background "squares" is utilized by the current area map.
0x0037	A-reg value stored here during BRK interrupt.
0x0038	X-reg value stored here during BRK interrupt.
0x0039	Y-reg value stored here during BRK interrupt.
0x003A	Player X Position	X position on current map. Map not redrawn on direct change.
0x003B	Player Y Position	Y position on current map.
0x003E	Player V-position on Overworld Map	#00 = Horizontal Strip two rows north of Garinham.
0x0042	Player H-position on Overworld Map	#00 = Vertical Strip two columns west of Garinham.
0x0045	Map ID	Value Map Value Map 01 World Map 10 Dragonlord B2 02 Charlock Castle 11 Dragonlord B3 03 Ruins of Hauksness 12 Dragonlord B4 04 Tantegel Castle 13 Dragonlord B5 05 Throne Room 14 Dragonlord B6 06 Dragonlord's Lair 15 Swamp Cave 07 Kol 16 Mountain Cave B1 08 Breconary 17 Mountain Cave B2 09 Garinham 18 Garin's Grave B1 0A Cantlin 19 Garin's Grave B2 0B Rimuldar 1A Garin's Grave B3 0C Sun Shrine 1B Garin's Grave B4 0D Rain Shrine 1C Erdrick's Cave B1 0E Magic Temple 1D Erdrick's Cave B2 0F Dragonlord B1
0x0047	Button(s) pressed	Uses binary processing. Here are the values: Value Button Value Button *1 A 1* Up *2 B 2* Down *4 Select 4* Left *8 Start 8* Right
0x004F	Countup Clock on Overworld	Activates small status window in upper-left corner when player doesn't move.
0x0050	Countup Clock (to what?)	Increments by #08.
0x0051-8C	Series of twenty, three-byte segments for NPC's (townsfolk, guards, etc.):	Byte/Bits Controls Data 1, d7-d5 NPC Type 000 = Man; 001 = Red Soldier; 010 = Grey Soldier; 011 = Merchant; 100 = King; 101 = Old Man; 110 = Woman; 111 = Stationary Guard 1, d4-d0 x-pos simple grid coords 2, d7 frame? 2, d6-d5 Direction Faced 00 = north; 01 = east; 10 = south; 11 = west 2, d4-d0 y-pos simple grid coords 3, all bits? movement
0x0090-91	Player X Position (Sprite)	Increments of 0x10 for major position. Relates to NPCs. Should match with 0x003A to ensure NPCs are in correct location on the map.
0x0092-93	Player Y Position (Sprite)	Increments of 0x10 for major position. Relates to NPCs. Should match with 0x003B to ensure NPCs are in correct location on the map.
0x0094-95	Random Number generator state	0x95 is used for the random value; influenced by 0x94.
0x00BA-BB	Experience	Raw experience amount. Level and other stats are generated from this value (eventually reverting changes within 0x00C5-CD)
0x00BC-BD	Gold	Gold
0x00BE	Equipment	This byte contains your current equipment. It's compiled from the three values for your sword, your armor, and your shield. Values are below.
0x00BF	Magic Keys	Set $00-$0A for that amount of keys. $0A will not show a number. $0B=1, $0C=2, etc.
0x00C0	Amount of Herbs
0x00C1-0x00C4	Items	Each nybble represents an item for a total of 8 items (not counting Magic Keys) in your inventory: Value Item Value Item 0 Nothing 8 Gwaelin's Love 1 Torch 9 Cursed Belt 2 Fairy Water A Silver Harp 3 Wings B Death Necklace 4 Dragon's Scale C Stones of Sunlight 5 Fairy Flute D Staff of Rain 6 Fighter's Ring E Rainbow Drop 7 Erdrick's Token F Herb
0x00C5	Player HP
0x00C6	Player MP
0x00C7	Player LV
0x00C8	Player Strength
0x00C9	Player Agility
0x00CA	Player Max HP
0x00CB	Player Max MP
0x00CC	Player Attack Power
0x00CD	Player Defense Power
0x00CE	Spells	Uses binary processing. Here are the values: Value Spell Value Spell *1 Heal 1* Stopspell *2 Hurt 2* Outside *4 Sleep 4* Return *8 Radiant 8* Repel
0x00CF	More Spells / Quest Progress	This byte is used for the last two spells, two plot events, and four equipment pieces. Value Spell *1 Healmore *2 Hurtmore *4 Secret Stairs in Dragonlord's Castle *8 Rainbow Bridge Constructed *16 Dragon's Scale Equipped *32 Fighter's Ring Equipped *64 Cursed Belt Equipped *128 Death Necklace Equipped
0x00d0	Light radius	Used to determine vision within dungons. Valid values are 01, 03, 05, 07. Can be set to 16, but values that high don't necessarily update the screen outside the centered 7x7 grid.
0x00d8	Menu horiz ptr	Horizontal position pointer for battle menu
0x00d9	Menu vert ptr	Vertical position pointer for battle menu
0x00da	Light timer	Set by Radiant spell and counts down. When it reaches 0, light radius is decreased.
0x00db	Repel timer	Set by Repel spell to FF and counts down by 2. When it reaches 0, repel wears off.
0x00DF	Quest / Combat Progress?	1-bit = rescued princess, 2-bit = returned princess, 8-bit = left the first room. If you are asleep in combat, the 128-bit is set. When you wake up, it is cleared. 16-bit, 32-bit, 64-bit, 128-bit all cleared when you enter combat.
0x00e0	Terrain / Enemy pointer	In battle, is a pointer to the current enemy type. Out of battle, is a pointer to the current terrain type. Enemy list below.
0x00e2	Enemy HP	Does not get reset after battle.
0x00e4	Quest Progress	2-bit = killed Golem, 4-bit = killed Dragonlord, 64-bit = killed Green Dragon
0x00e6-e7	Music Track 1 position	Pointer
0x00ea-eb	Music Track 2 position	Pointer
0x00f4	Music note delay timer (drum/track 1)	Timers for two independent music sources. If set to 00, that track is paused.
0x00f8	Music note delay timer (flute/track 2)
0x00fc	Music tempo	00=off, ff=full
0x0112-1CF	Unused stack space
0x0200-2FF	OAM (sprite table)
0x0400-7BF	Copy of UI/Text layer
0x6002	CHR-ROM page 0 (background)	00 = Title Screen; 01; Everything Else
0x6003	CHR-ROM page 1 (sprites)	02 = Non-Battle; 03 = In-Battle