Zelda II : The Adventure of Link

This document is a compilation of all I already know about the ROM Zelda II : The Adventure of Link. Where is the data and what you can do with it. If you know anything else that is not mentioned here, please let me know. And if you find grammatical errors (I'm not a native English speaker), anything that doesn't make sense, or if you simply want to ask me something about this document, let me know as well...

trax [@] bwass [.] org

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Most wanted :

- Overworld map width (done)
- Overworld shadows (approx. offset known, behavior and number unknown)
- Town data (speech spots, doors destinations)
- Enemy damage
- Music (approx. offset known, coding unknown)
- Sounds (offset known, coding unknown)
- Link's walking speed on the overworld (slower in swamp)
- Link's recoil variables (done)
- Enemy AI (many things done)
- Town text line skip (done)

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Overworld Map

The overworld map is coded from left to right, then down. There are four places on the ROM where you can find such data, which correspond to West Hyrule, Death Mountain, East Hyrule and Maze Island.

These are the offsets for the overworld data, and the number of bytes that are actually used for the region :

Offset (hex) Length (in bytes)
West Hyrule 506C - 538C 801
Death Mountain 665C - 68F7 668 (actually much more than that)
East Hyrule 9056 - 936F 794
Maze Island A65C - 68F7 668 (actually much more than that)

Every byte in those ranges represent an horizontal strip of 1 to 16 units of a given terrain (forest, grass, town, etc). If a strip must be more than 16 (or 32, 48, etc), then another byte is needed. The higher bits of every byte determine the number of consecutive units of the terrain (0 makes 1 unit, and F makes 16 units), and the lower bits determine the type of terrain. For example :

A strip of 3 forest units
The code for forest is 6
The byte is : 26

A strip of 16 mountain units
The code for mountain is B
The byte is : FB

This is the complete chart for terrain types :

0 : Town
1 : Grotto
2 : Palace
3 : Bridge
4 : Desert
5 : Grass
6 : Forest
7 : Swamp
8 : Graveyard
9 : Road
A : Lava
B : Mountain
C : Water
D : Water (walkable)
E : Rock
F : Spider

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Text

Each character is represented by 1 byte, with DA for A, DB for B, and so on. Dialog boxes in towns end with FF, and the following byte is the first character of the next dialog. Use FD for a line break and FE for a line break with delay. Each line should not be more than 10 characters, including spaces. If you omit the FD byte, the text will go on and eventually wrap to the other side of the screen.

This is the chart for character coding :

D0 = 0
D1 = 1
D2 = 2
D3 = 3
D4 = 4
D5 = 5
D6 = 6
D7 = 7
D8 = 8
D9 = 9
DA = A
DB = B
DC = C
DD = D
DE = E
DF = F
E0 = G
E1 = H
E2 = I
E3 = J
E4 = K
E5 = L
E6 = M
E7 = N
E8 = O
E9 = P
EA = Q
EB = R
EC = S
ED = T
EE = U
EF = V
F0 = W
F1 = X
F2 = Y
F3 = Z
F6 = -
CF = .
9C = ,
34 = ?
36 = !
CE = /
F4 = Space
FD = Line break
FE = Line break with delay
FF = End of dialog

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Notes on text drawing

There are 14 graphics banks in Zelda II. Each of these banks (except the last one, which is empty) contain the exact same copy of the text graphic tiles at the same relative offset. But the bank used depends of the region you're in (selection screen, east Hyrule, west Hyrule, towns, palaces). This said, the text appearance can be changed in specific regions.

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Dialogs

E390 - EFCD

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Pointers for Dialogs

The corresponding pointers for dialogs follow the dialogs data immediately. They are from EFCE to F091. There's a total of 98 dialogs.

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Story

The text for the story at the beginning is located between offsets 16942 and 16AF4, inclusively. The coding is the same as any other text, except for 36 (!), and some other characters are not the same since they are taken from a different graphics bank, like the copyright symbol.

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Game Over Text

0013 - 001C GAME OVER
0020 - 002E RETURN OF GANON

Continue or Save

1FDE8 - 1FDEF CONTINUE
1FDF3 - 1FDF6 SAVE

Caution message

1FE1A - 1FE20 CAUTION
1FE24 - 1FE85 MESSAGE (ends with FF like dialogs)

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Selection Screen

17C2C - 17C36 S E L E C T
17C4E - 17C53 -NAME-
17C57 - 17C5D -LEVEL-
17C8B - 17C9C REGISTER YOUR NAME
17CB2 - 17CC1 ELIMINATION MODE
17CD6 - 17CE9 REGISTER YOUR NAME
17CED - 17CEF END
17D13 - 17D4D ABCDEFGHIJKLMNOPQRSTUVWXYZ-.
17D51 - 17D64 0123456789
17D6C - 17D7D ELIMINATION MODE
17D81 - 17D83 END

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End Credits

15290 - 153BC

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Dialogs Pane

F403 - F416 Pointers to the type of line (10 lines)
F417 - F424 Line for top and bottom
F425 - F432 Line for content (where the letters are displayed)

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Level Up Pane and Pause Pane

1B6A - 1BB9 Pointers to the type of line
1BBA - 1D5D Line Types (14 bytes per line)

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Make Link go through any terrain on the overworld.

Replace 02 at 072E by 00.

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Number of lives you start with

Change the value at 1C369 to set the number of lives Link starts with. If you set it to 0, the counter wraps and you end up with 255 lives.

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Magic Usage

The number of units of magic needed for every spell and all 8 magic levels. The values are from 0D8B to 0DCA. The first 8 values are for Shield spell, from level 1 to level 8, the next 8 for Jump, etc. To get the in-game values from these data, you must first convert them into decimal, and divide by 2. For example :

Shield Spell Level 1 : 40
In decimal : 64
Divide by 2 : 32
So you need 32 units of magic (two squares) to cast Shield at level 1.

The complete chart (in hex) :

LEVEL 1 2 3 4 5 6 7 8

SHIELD 40 30 30 20 20 20 20 20
JUMP 60 50 40 40 28 20 18 10
LIFE 8C 8C 78 78 64 64 64 64
FAIRY A0 A0 78 78 50 50 50 50
FIRE F0 A0 78 3C 20 20 20 20
REFLECT F0 F0 A0 60 50 40 30 20
SPELL F0 E0 C0 A0 60 40 30 20
THUNDER F0 F0 F0 F0 F0 F0 C8 80

The same chart, converted to in-game values :

LEVEL 1 2 3 4 5 6 7 8

SHIELD 32 24 24 16 16 16 16 16
JUMP 48 40 32 32 20 16 12 8
LIFE 80 80 60 60 50 50 50 50
FAIRY 80 80 60 60 40 40 40 40
FIRE 120 80 60 30 16 16 16 16
REFLECT 120 120 80 48 40 32 24 16
SPELL 120 112 96 80 48 32 24 16
THUNDER 120 120 120 120 120 120 100 64

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Magic Spell Names

From 1C3A to 1CA6. Each spell is embedded in a few bytes that determines the borders of the Pause Pane.

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Experience for Level Up

The amount of experience points needed to level up for Attack, Magic and Life can be found between 1669 and 1698 inclusively. Each value is made of 2 bytes, but those 2 bytes are not contiguous. The low byte is always 24 bytes further than the corresponding high byte. For example, at address 1669, you get the high byte of the experience you need for Attack to go to level 2, and 24 bytes further, at 1681, you get the low byte. This is the complete chart :

High Byte Low Byte In-game Value

Attack Level 2 00 C8 200
Attack Level 3 01 F4 500
Attack Level 4 03 E8 1000
Attack Level 5 07 D0 2000
Attack Level 6 0B B8 3000
Attack Level 7 13 88 5000
Attack Level 8 1F 40 8000
Attack Extra Life 23 28 9000

High Byte Low Byte In-game Value

Magic Level 2 00 64 100
Magic Level 3 01 2C 300
Magic Level 4 02 BC 700
Magic Level 5 04 B0 1200
Magic Level 6 08 98 2200
Magic Level 7 0D AC 3500
Magic Level 8 17 70 6000
Magic Extra Life 23 28 9000

High Byte Low Byte In-game Value

Life Level 2 00 32 50
Life Level 3 00 96 150
Life Level 4 01 90 400
Life Level 5 03 20 800
Life Level 6 05 DC 1500
Life Level 7 09 C4 2500
Life Level 8 0F A0 4000
Life Extra Life 23 28 9000

If you input a number that is not a multiple of 10, the nearest high tenth will be displayed, but the exact number of experience will still be needed to level up. Values higher than 9000 are treated as 9000.

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Attack Power

Link's attack power has a corresponding value for each level. The 8 values can be found between 1E67D and 1E684. The default values are :

Level 1 : 02
Level 2 : 03
Level 3 : 04
Level 4 : 06
Level 5 : 09
Level 6 : 0C
Level 7 : 12
Level 8 : 18
Thunder : 32

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Palettes for Side View Areas

401E - 4021 North Castle - Hub Text (0F 30 12 16)
4022 - 4025 North Castle - Princess and Decor
4026 - 4029 North Castle - Bricks and Columns
402A - 402D North Castle - Curtains
402E - 4031 Cave - Background, Hub
4032 - 4035 Cave - Background texture and Walls
4036 - 4039 Cave - Lava
403A - 403D Cave - ???? (Probably Clouds) (0F 30 10 00)
403E - 4041 Desert - Sky and Hub (22 30 12 16)
4042 - 4045 Desert - Rock Formation and Cacti (22 29 17 09)
4046 - 4049 Desert - Ground (22 30 36 27)
404A - 404D Desert - Clouds (22 30 10 00)
404E - 4051 Grass - Sky and Hub (21 30 12 16)
4052 - 4055 Grass - ???? (Probably Rock Formation) (21 30 00 0F)
4056 - 4059 Grass - Ground and Grass (21 29 19 09)
405A - 405D Grass - Clouds (21 30 10 00)
405E - 4061 Forest - Background and Hub (0F 30 12 16)
4062 - 4065 Forest - Tree Stems (0F 17 07 08)
4066 - 4069 Forest - Leaves and Bushes (0F 29 19 09)
406A - 406D Forest - ???? (Probably Clouds) (20 30 10 00)
406E - 4071 Swamp - Sky and Hub (21 30 12 16)
4072 - 4075 Swamp - Dead Trees (21 37 18 0F)
4076 - 4079 Swamp - Swamp (21 29 1C 0C)
407A - 407D Swamp - Clouds (21 30 10 00)
407E - 4081 Graveyard - Sky and Hub (03 30 12 16)
4082 - 4085 Graveyard - Ground and Rock Formation (03 19 09 0F)
4086 - 4089 Graveyard - Red Bricks (03 27 16 0F)
408A - 408D Graveyard - Clouds and Gravestones (03 30 00 0F)
408E - 4091 Bridge - Background (21 30 12 16)
4092 - 4095 Bridge - Bridge and Rock Formation (21 37 18 0F)
4096 - 4099 Bridge - Water (21 30 11 01)
409A - 409D Bridge - Clouds (21 30 10 00)
409E - 40A1 Cave Without Candle - Background (0F 30 12 16)
40A2 - 40A5 Cave Without Candle - Background texture and Walls (0F 12 01 0F)
40A6 - 40A9 Cave Without Candle - Lava (0F 0F 0F 0F)
40AA - 40AD Cave Without Candle - ???? (Probably Clouds) (0F 0F 0F 0F)

Palettes for Link in Grass, Desert, Swamp, Graveyard

40AE - 40B1 Link (FF 18 36 2A)
40B2 - 40B5 Flame, last block of life/magic, menu items, enemy hit, score
40B6 - 40B9 Red enemies, red jar (FF 0F 16 30)
40BA - 40BD Chandelier, flying sword, blue enemies, blue jar, Link hit

Palettes for Link in Forest and Caves

40BE - 40C1 Link (including Death Mountain)
40C2 - 40C5 Last block of LM, menu items, enemy hit, score, spider's rope
40C6 - 40C9 Red enemies, red jar
40CA - 40CD Flying sword, blue enemies, blue jar, Link hit (FF 0C 2C 30)

40CE - 40D1 ???? (FF 18 36 2A)

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10480 - 10483 22 30 12 16
????

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Palettes for Overworld

07F3 - 0802 Code representing one of the 4 palettes starting from 1C46B

1C46B - 1C46E Palette 00 Grass, Forest, Swamp
1C46F - 1C472 Palette 01 Grotto, Bridge, Graveyard, Road
Lava, Mountain, Rock, Spider
1C473 - 1C476 Palette 10 Town, Palace
1C477 - 1C47A Palette 11 Desert, Water, Water (walkable)

1C47B Black for Everything (except Grass). Also for screen between fights.
1C47C Link Outline
1C47D Link Skin
1C47E Link Outfit

1C47F ????
1C480 ????
1C481 Right Border Row 1 (?)
1C482 Right Border Row 2 (?)

1C483 Monsters (they become gray no matter the value)
1C484 Monsters Outline
1C485 ????
1C486 Monsters

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Overworld Tile Mapping

Tile mapping on the overworld is always in this order : top-left, bottom-left, top-right, bottom-right. Town, Palace, Forest, Graveyard, Mountain, Rock and Spider are composed of 4 different tiles. The other ones are either composed of 1 tile, repeated 4 times, or 2 tiles, repeated 2 times.

07B3 - 07B6 Town (5C-5D-5E-5F)
07B7 - 07BA Grotto (F4-F4-F4-F4)
07BB - 07BE Palace (60-61-62-63)
07BF - 07C2 Bridge (5A-5A-5B-5B)
07C3 - 07C6 Desert (6C-6C-6C-6C)
07C7 - 07CA Grass (6D-6D-6D-6D)
07CB - 07CE Forest (68-69-6A-6B)
07CF - 07D2 Swamp (6F-6F-6F-6F)
07D3 - 07D6 Graveyard (70-71-FE-FE)
07D7 - 07DA Road (FE-FE-FE-FE)
07DB - 07DE Lava (6E-6E-6E-6E)
07DF - 07E2 Mountain (64-65-66-67)
07E3 - 07E6 Water (6E-6E-6E-6E)
07E7 - 07EA Water (walk) (6E-6E-6E-6E)
07EB - 07EE Rock (56-57-58-59)
07EF - 07F2 Spider (40-41-42-43)

43A9 - 43AA Tile Mapping for destroyed Rock or Forest (1-2)
43AE - 43AF Tile Mapping for destroyed Rock or Forest (3-4)

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Battlefields Tile Mapping

442F - 4432 Background for Grotto (with candle?)
4433 - 4436 ????
4437 - 443A ????
443B - 443E ????
443F - 4442 Top of High Cacti for Desert
4443 - 4446 Stem of High Cacti for Desert
4447 - 444A Top of Small Cacti for Desert
444B - 444E Stem of Small Cacti for Desert
444F - 4452 ????
4453 - 4456 Body of Dead Tree for Swamp / Tree Trunk for Forest
4457 - 445A Top of Dead Tree for Swamp
445B - 445E Bridge Ropes
445F - 4462 Zelda's Head for North Palace
4463 - 4466 Zelda's Body for North Palace
4467 - 446A Red Carpet for North Palace
446B - 446E Volcano Background
446F - 4472 Rock Floor for Grotto/Desert
4473 - 4476 Rock Wall for Grotto/Desert
4477 - 447A Some Sort of Grotto Wall (?)
447B - 447E Ceiling for Grotto
447F - 4482 Left End of Horizontal Dolmen
4483 - 4486 Middle of Horizontal Dolmen
4487 - 448A Right End of Horizontal Dolmen
448B - 448E Top of Vertical Dolmen
448F - 4492 Body of Vertical Dolmen
4493 - 4496 Top of Logs for Lost Woods
4497 - 449A Base of Logs for Lost Woods
449B - 449E Bridge Base

44A7 - 44AA Breaking Bridge
44AB - 44AE ????
44AF - 44B2 Lava Surface for Grotto
44B3 - 44B6 Single Weed for Grass/Swamp
44B7 - 44BA Double Weed for Grass/Swamp
44BB - 44BE Grass Surface for Grass
44BF - 44C2 Bushes Surface for Forest
44C3 - 44C6 Body of Column for North Palace
44C7 - 44CA Top of Column for North Palace
44CB - 44CE Swamp Surface for Swamp
44CF - 44D2 ????
44D3 - 44D6 Lava Bottom for Grotto
44D7 - 44DA Above Ground for Desert ?
44DB - 44DE White Bricks for North Palace
44DF - 44E2 Leaves of Trees for Forest
44E3 - 44E6 Hanging Leaves for Forest
44E7 - 44EA ????
44EB - 44EE Ground for Desert/Grass
44EF - 44F2 Ground for Forest
44F3 - 44F6 Ground for Swamp

538D - 5390 Curtain Part
5391 - 5394 Curtain End
5395 - 5398 Any Cloud - Left End
5399 - 539C Big Cloud - Right End
539D - 53A0 Small Cloud - Right End
53A1 - 53A4 Gravestone
53A5 - 53A8 Cross
53A9 - 53AC Slanted Cross
53AD - 53B0 ????
53B1 - 53B4 Ground for North Castle
53B5 - 53B8 Destroyable Block

Level Data

4C4C Any Area with Sky (grass, desert, swamp, graveyard) - Parameters
4C4C Controls bushes, logs, etc, on/off (?) (18)
4C4D ? (60)
4C4E Default ceiling and floor heights
0X = grotto ceiling, floor and background
00 - 07 = floor height (00 = no floor) (07 = high floor)
08 - 0F = ceiling height (08 = high ceiling) (0F = low ceiling)
1X = forest bg and ceiling
2X = water or lava
3X = swamp (but no slow down effect)
4X = desert and grass ground
5X = fucked up (grotto ceiling, but strange bg)
6X = brick ceiling and mini brick ground (like North Castle)
7X = grotto (same as 0X ?)
8X = grotto floor and bg, but no ceiling
9X = forest, but no ceiling
Etc, but no ceiling
4C4F ? (00)

4C50 - 4C63 Clouds shared by any area with sky

4C64 Forest - Parameters
4C64 Controls bushes, logs, etc, on/off (???) (14)
4C65 ? (48) (bit 8 (80) set = tree stems become rock walls)
4C66 Default ceiling (leaves) and floor height (9A)
4C67 ? (60)

4C68 - 4C77 Tree stems in Forest

4C78 - 4C8B ???? (looks like another set of trees)

4C8C - 4C8F Forest with 50 exp. bag - Parameters
4C90 - 4CA5 Forest with 50 exp. bag - Clouds and tree stem

4CA6 - 4CAD Last part of cave with 2nd Heart Container (12 E0 0E 48)
4CAE - ???? ????

Level Data

4CC5 - 4CFA North Castle
4CFB - 4D16 Generic Desert NW
4D17 - 4D30 Generic Grass NW
4D31 - 4D44 Generic Forest NW
4D45 - 4D66 Generic Swamp NW
4D67 - 4DA8 Generic Graveyard NW
4DA9 - 4DC4 Bridge NW (used for a few places)
4DC5 - 4DDF Heart Container 1
4DE0 - 4E04 Trophy
4E05 - 4E23 Forest with 50 exp. bag and Aches
4E24 - 4E42 Forest with 100 exp. bag and Megmets
4E43 - 4E71 Doll in Moruge / Red Jar in Western Midoro
4E72 - 4E87 Lost Woods
4E88 - 4EB5 Heart Container 2 (Part 1)
4EB6 - 4EDB Cave south of Ruto - North (Part 1 and probably part 2)
4EDC - 4EE7 ???
4EE8 - 4EFD Water of Life (Part 1)
4EFE - 4F1B Cave with 200 exp. and Megmets (Part 1)
4F1C - 4F37 ???
4F38 - 4F6B Bubble Path south of Palace 1
4F6C - 4F7E Red Jar near King's Tomb
4F7F - 4FAC Cave to 3rd palace (Part 1)
4FAD - 4FBA Cave south of Ruto (Part 3)
4FBB - 4FD9 Generic Path / Red Jar Eastern Midoro / Doll East of Palace 3
4FDA - 4FEC 200 exp. bag and Megmets (Part 2)
4FED - 4FFF Heart Container 2 (Part 2)
5000 - 502C Magic Container 1
502D - 504E Generic Forest SW
504F - 5058 Fairy east of Saria / Fairy near Palace 2
5059 - 506B ???

102F5 - 1032A Palace 1 Entrance

Object Coding

High Bits : Y Position (0 = highest)
Low Bits : X Position (from last object) (from left to right)
Byte 1 : offset coordinates from top left starting from last object
Byte 2 : type of object
14 = high (in the sky)
74 = low

00 = Gravestone
01 = Cross
02 = Slanted Cross
03 = Log Body
04 = Complete Dolmen
05 = ???? (locked door ?)
06 = Zelda
07 = Zelda
08 = Hole (?)
09 = Long Cloud
0A = Short Cloud
0B = Short Cloud
0C = Short Cloud
0D = Short Cloud
0E = Short Cloud
0F = Crash

Set 0

1x = Crash
2x = Tree Leaves (1 wide, 2 high, extends horizontally)
3x = Tree Leaves (2 wide, 2 high, extends horizontally)
4x = Curtains (2 high)
5x = Tree Leaves (1 high)
6x = Destroyable Blocks (1 high, extends horizontally)
7x = Horizontal Pit (1 high, extends horizontally)
8x = Single Tall Grass
9x = Double Tall Grass
Ax = North Palace Carpet (1 high)
Bx = North Palace Bricks (1 high)
Cx = Strip of Volcano Background (1 high)
Dx = Destroyable Blocks (1 wide, extends vertically)
Ex = Background Tree Trunk (1 wide, extends vertically)
Fx = North Palace Column (1 wide, extends vertically)

Set 1

1x = Crash
2x = Rock Floor (2 high)
3x = Rock Ceiling (2 high)
4x = Bridge (2 high)
5x = Rock Floor Surface (1 high, extends horizontally)
6x = Destroyable Blocks (1 high, extends horizontally)
7x = Breaking Bridge (1 wide)
8x = Single Weed
9x = Double Weed
Ax = Horizontal Pit (1 high, extends horizontally)
Bx = North Palace Bricks (1 high)
Cx = Strip of Volcano Background (1 high)
Dx = Destroyable Blocks (1 wide, extends vertically, down)
Ex = Rock Floor (2 high, extends vertically, down)
Fx = Vertical Dolmen (2 high, extends vertically, down)

Extra Objects (Y = 15)

0x = Crash
1x = Crash
2x = Lava at Bottom (3 high)
3x = Cactus (extends vertically, up)
4x = Cactus with Stem
5x = Elevator (?)
6x - Fx = Crash

Collectable Objects

00 = Candle
01 = Glove
02 = Raft
03 = Boot
04 = Flute
05 = Cross
06 = Hammer
07 = Magical Key
08 = Key
09 = Doll (in grottos, glitched thing, transforms to Candle when hit)
0A = Exp. Bag 50 Pts
0B = Exp. Bag 100 Pts
0C = Exp. Bag 200 Pts
0D = Exp. Bag 500 Pts
0E = Magic Container
0F = Heart Container
10 = Blue Jar
11 = Red Jar
12 = Doll
13 = Kidnapped Child
14 = Trophy
15 = Medicine

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Character Physics

1480 High Jump < Full Speed (lower means jump higher)
1481 High Jump = Full Speed (lower means jump higher)
1482 Normal Jump < Full Speed (lower means jump higher)
1483 Normal Jump = Full Speed (lower means jump higher)

1488 Momentum of Sword Strikes (standing)
1489 Delay Before Leaning Back (after sword strike)
148A Time of Leaning Back
148B Position of Link Before Striking (standing)

00 = Walk Frame 1
01 = Walk Frame 2
02 = Walk Frame 3
03 = Walk Frame 4 (also standing still)
04 = Before Striking (default)
05 = Sword Strike
06 = Ducking
07 = Strike Ducked
08 = Up Stab
09 = Down Stab
0A = Hit Stance
0B = Strange Graphic (?)
0C = Candle in Hand
0D = Candle and Glitchy Tiles
0E = Candle and Glitchy Tiles
0F = Candle and Glitchy Tiles

148C Position of Link Striking
148D Position of Link after Striking
148E Position of Link Leaning Back
148F Position of Link Striking Ducked
1490 Position of Link after Striking Ducked
1491 Position of Link after Striking Ducked (after) (?)
1492 Position of Link after Striking in Mid-Air (?)

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Last modification : 08-09-2007 (D-M-Y)

Change the Dialog Boxes in Zelda II
Offsets assume ROM with header

Dialog boxes in Zelda II are drawn using two different types of line. Originally, each box is made of 10 lines of tiles. The pointers for the lines tile mapping are found between 0xF403 and 0xF415:

0xF403 : 07B4 15B4 15B4 15B4 15B4 15B4 15B4 15B4 15B4 07B4

So 0x07B4 is for the first and last lines, and 0x15B4 for the remaining lines.

These pointers point to these offsets:

0xF417 : CA CB CB CB CB CB CB CB CB CB CB CB CB CA (Line Type 1)
0xF425 : CC F4 F4 F4 F4 F4 F4 F4 F4 F4 F4 F4 F4 CC (Line Type 2)

Since there's no free space before or after the pointer array at 0xF403, we must relocate it and then extend it. The nearest chunk of unused data is located at 0xF830, but I refrain from using this place because my Zelda II Editor uses this chunk to store additional dialog data when it's too long to fit into the original space. The point is, you have to relocate the pointer array to a suitable offset and convert the pointers accordingly.

We will use offset 0xDFE0 to store the new pointer array:

0xDFE0 : 07B4 15B4 15B4 15B4 15B4 15B4 15B4 15B4 15B4 15B4 15B4 07B4

Notice the new array is now 12 pointers long, instead of 10. Next, we must change the bytes used to construct the pointers, so they now point to our new location:

0xF0E8 : F3B3 -> D09F
0xF0ED : F4B3 -> D19F
0xF0F2 : FDB3 -> DA9F
0xF0F7 : FEB3 -> DB9F

The last thing we have to do is to change the variable used to tell the routine to stop when there are enough lines drawn. Each iteration draws two lines of tiles. Instead of 5 iterations, we want 7. This variable is stored at memory location 0x0525 and is tested at 0xF114:

0xF114 : 05 -> 07

Voil?! If everything is correct, you now have two extra rows in your dialogs boxes. You can extend dialogs so towns people can say more...

Now if we could find a way to make the text draw on each line, instead of skipping one, it would give us a double advantage: more text displayed in less screen space. Extending the boxes horizontally is also an interesting possibility...

If you have any comments or questions, let me know...

trax [@] 3zsoftware [.] com

Zelda II - Random Discoveries

0x617

85 70 0A 90
4A -> 0A : controls are changed in overworld

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0x736

A9 84 8D 03 ...

84 : controls the position of Link on the overworld
84 -> 7B : the Overworld seems shifted

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0x1396
94 -> 93 : Hyperactive Link

0x139B
02 -> 04 : Link stops instantly both ways

0x139C
A5 70 -> A9 70 : Link's movement and scrolling to the left altered

Zero Page 5F has to do with Link's velocity (both ways) (?)
Zero Page A7 = Link's status, 03 = is jumping (?)

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0x13C7
08 07 05 04 -> Interesting variables

08 07 05 -> Timing between frames when you start walking
04 -> Timing between frames when walking at full speed

0x145E
Changes timing between each frame when walking

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0x4170

40 40 8D 8C 09 40 40 40 etc...
Forest Layers Tile Mapping Table (?)

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0xF0DB

A9 08 85 EE ...
Sound to play when displaying a dialog box in towns (tuluiit!)
A9 08 : Accumulator = 08

08 = sound when displaying a dialog box
09 = falling in a hole (music stops)
0A = demon hit on the overworld
10 = sound of projectile hitting Link's shield

85 EE : Accumulator -> Zero Page EE

--------

0x1264

A9 10 9D 03 03 ...
Changed 10 to 0C
When Link casts a spell, a part of the decor flashes and changes color, instead of Link.
The value changes what is flashing, and the resulting palette

--------

0x1EDA

A9 10 85 EF A0 ...
Changed 10 to 66
Sound to play when moving the arrow in the Level Up pane
66 = fairy sound

--------

0x1F61

A9 10 85 EB CA ...
Changed 10 to 67
Music to play when leveling up
11 = overworld music

--------

0x2224

A9 12 85 EF AD ...
Changed 10 to 12
Sound to play when moving the cursor in pause pane
12 = fairy sound
20 = elevator sound

--------

0x563C

Enemy variables! For Deelers...

60 -> 40 : makes Deelers go down to another height
40 = go down 4 tiles
60 = go down 6 tiles
The enemy's initial Y position + 60

0x5635 (Real : 0x5625)

5625: B5 2A LDA $2A,X
5627: 8D DD05 STA $05DD
562A: 18 CLC
562B: 69 60 ADC #$60
562D: 8D DC05 STA $05DC
5630: 60 RTS

--------

Starting from 0x5455 (ROM) : interesting pointers...
Possibly enemy-specific init routines pointers...

- AD95 (18) -> 55AD (Various Enemies)
- 2096 (1) -> 5620 (Red Jar)
- 2596 (2) -> 5625 (Deeler)
- 3196 (8) -> 5631 (Moblin, Daira, Goriya)
- 4E98 (5) -> 584E (Generators: Moblin, Bubble, Rock, Bago Bago, Moby)
- 6C98 (1) -> 586C (Geldarm)

--------

55AD: 60 RTS ; AD95 (55AD) means "skip this part"

--------

5620: A9 11 LDA #$11 ; A = 11
5622: 95 AF STA $AF,X
5624: 60 RTS

--------

5625: B5 2A LDA $2A,X
5627: 8D DD05 STA $05DD
562A: 18 CLC
562B: 69 60 ADC #$60
562D: 8D DC05 STA $05DC
5630: 60 RTS

--------

5631: D6 AF DEC $AF,X
5633: 60 RTS

[...]

5641: FE 8405 $0584,X ; Moblin spear's gravity variable
5644: 4C FF96 $96FF ; goto $56FF

5647: A0 04 LDY #$04 ; Y = 04
5649: FE 4C04 DEC $044C,X
564C: BD 4C04 LDA $044C,X
564F: 29 10 AND #$10 ; keep bits ...x....
5651: F0 02 BEQ $5655 ; if bit 4 is 1, goto $5655

5653: A0 FC LDY #$FC ; Y = FC

5655: 94 77 STY $77,X
5657: 4C FF96 JMP $96FF ; goto $56FF

A0 FC 94 77 4C FF 96 20 EB 96 4C 39 96 FF

----

56FF: 20 D4DE JSR $DED4 ; goto $1DED4

5702: A5 CA LDA $CA
5704: 29 FC AND #$FC ; keep bits xxxxxx..
5706: F0 05 BEQ $570D

5708: A9 00 LDA #$00 ; A = 0 (set it to 03 for funny results)
570A: 95 87 STA $87,X
570C: 60 RTS

--------

584E: A0 05 LDY #$05 ; Y = 05

5850: C4 10 CPY $10 ;
5852: F0 0C BEQ $5860 ;
;
5854: B9 B600 LDA $00B6,Y ;
5857: F0 07 BEQ $5860 ;
;
5859: B9 A100 LDA $00A1,Y ;
585C: D5 A1 CMP $A1,X ;
585E: F0 04 BEQ $5864 ;
;
5860: 88 DEY ;
5861: 10 ED BPL $5850 ; loop until Y < 0

5863: 60 RTS

5864: 98 TYA
5865: AA TAX
5866: 20 3DDD JSR $DD3D ; goto $1DD3D

5869: A6 10 LDX $10

586B: 60 RTS

--------

586C: A9 01 LDA #$01 ; A = 1
586E: 95 AF STA $AF,X
5870: 4A LSR ; A / 2
5871: 95 60 STA $60,X
5873: B5 2A LDA $2A,X
5875: 69 3F ADC #$3F
5877: 95 81 STA $81,X

5879: 60 RTS

--------

1D91E: A5 C9 LDA $C9
1D920: 29 08 AND #$08 ; keep bits ....x...
1D922: D0 0D BNE $1D931

1D924: B5 81 LDA $81,X
1D926: 0D FE07 ORA $07FE
1D929: D0 06 BNE $1D931

1D92B: A9 C0 LDA #$C0
1D92D: 85 EC STA $EC
1D92F: F6 81 INC $81,X

1D931: 20 40DE JSR $DE40 ; got 1DE40

20 40 DE B4 AF D0 0F B5 A8 29 10 F0 08

--------

1DD3D: B4 BC LDY $BC,X
1DD3F: 30 06 BMI $1DD47

1DD41: B1 D6 LDA ($D6),Y
1DD43: 29 7F AND #$7F ; keep bits .xxxxxxx
1DD45: 91 D6 STA ($D6),Y

1DD47: A9 00 LDA #$00
1DD49: 95 B6 STA B6,X

1DD4B: 60 RTS

--------

0x5BD0
79 B3 9B ...
79 -> 7D : Geldarms go crazy after shrinking

0x5BE3 : coefficient for Geldarm restretching speed (05) (> means slower)

--------

0x1DEE4 (Real : 0x1DED4)

Entry point for projectiles routines
X + 7 (Enemies memory offsets + 7)
And other stuff, including Link's movement and scrolling (dah!)

1DED4: 8A TXA
1DED5: 18 CLC
1DED6: 69 07 ADC #$07
1DED8: AA TAX

1DED9: 20 CED1 JSR $D1CE ; goto $1D1CE
1DEDC: 20 0AD2 JSR $D20A ; goto $1D20A

1DEDF: A0 02 LDY #$02 ; Y = 2
1DEE1: 20 7DF2 JSR $F27D ; goto $1F27D

1DEE4: A6 10 LDX $10
1DEE6: 60 RTS

----

1D1CE: B5 70 LDA $70,X
1D1D0: 0A ASL
1D1D1: 0A ASL
1D1D2: 0A ASL
1D1D3: 0A ASL
1D1D4: 85 01 STA $01
1D1D6: B5 70 LDA $70,X
1D1D8: 4A LSR
1D1D9: 4A LSR
1D1DA: 4A LSR
1D1DB: 4A LSR
1D1DC: C9 08 CMP #$08 ; if (A <= 08)
1D1DE: 90 02 BCC $1D1E2 ; goto $1D1E2

1D1E0: 09 F0 ORA #$F0 ; set bits xxxx....

1D1E2: 85 00 LDA $00
1D1E4: A0 00 LDY #$00 ; Y = 0
1D1E6: C9 00 CMP #$00 ; if (A >= 0)
1D1E8: 10 01 BPL $1D1EB ; goto $1D1EB

1D1EA: 88 DEY

1D1EB: 84 02 STY $02
1D1ED: BD D603 LDA $03D6,X
1D1F0: 18 CLC
1D1F1: 65 01 ADC $01
1D1F3: 9D D603 STA $03D6,X
1D1F6: A9 00 LDA #$00 ; A = 0
1D1F8: 2A ROL
1D1F9: 48 PHA
1D1FA: 6A ROR
1D1FB: B5 4D LDA $4D,X
1D1FD: 65 00 ADC $00
1D1FF: 95 4D STA $4D,X
1D201: B5 3B LDA $3B,X
1D203: 65 02 ADC $02
1D205: 95 3B STA $3B,X
1D207: 4C 47D2 JMP $D247 ; goto $1D247

----

1D20A: BD 7D05 LDA $057D,X
1D20D: 0A ASL
1D20E: 0A ASL
1D20F: 0A ASL
1D210: 0A ASL
1D211: 85 01 STA $01
1D213: BD 7D05 LDA $057D,X
1D216: 4A LSR
1D217: 4A LSR
1D218: 4A LSR
1D219: 4A LSR
1D21A: C9 08 CMP #$08 ; if (A <= 08)
1D21C: 90 02 BCC $1D220 ; goto $1D220

1D21E: 09 F0 ORA #$F0 ; set bits xxxx....

1D220: 85 00 STA $00
1D222: A0 00 LDY #$00
1D224: C9 00 LDA #$00
1D226: 10 01 BPL $1D229

1D228: 88 DEY

1D229: 84 02 STY $02
1D22B: BD E603 LDA $03E6,X
1D22E: 18 CLC
1D22F: 65 01 ADC $01
1D231: 9D E603 STA $03E6,X
1D234: A9 00 LDA #$00
1D236: 2A ROL
1D237: 48 PHA
1D238: 6A ROR
1D239: BD 2900 LDA $0029,X
1D23C: 65 00 ADC $00
1D23E: 9D 2900 STA $0029,X
1D241: B5 19 LDA $19,X
1D243: 65 02 ADC $02
1D245: 95 19 STA $19,X
1D247: 68 PLA
1D248: 18 CLC
1D249: 65 00 ADC $00
1D24B: 60 RTS

----

1D247: 68 PLA
1D248: 18 CLC
1D249: 65 00 ADC $00
1D24B: 60 RTS

----

1F27D: 84 00 STY $00
1F27F: A9 00 LDA #$00
1F281: 99 C800 STA $00C8,Y
1F284: A0 03 LDY #$03

1F286: B5 4D LDA $4D,X
1F288: 18 CLC
1F289: 79 74F2 ADC $F274,Y
1F28C: 85 0E STA $0E
1F28E: B5 3B LDA $3B,X
1F290: 69 00 ADC #$00
1F292: 85 0F STA $0F
1F294: A5 0E LDA $0E
1F296: CD 2C07 CMP $072C
1F299: A5 0F LDA $0F
1F29B: ED 2A07 SBC $072A
1F29E: F0 0F BEQ $1F2AF

1F2A0: 84 01 STY $01
1F2A2: B9 70F2 LDA $F270,Y
1F2A5: A4 00 LDY $00
1F2A7: 19 C800 ORA $00C8,Y
1F2AA: 99 C800 STA $00C8,Y
1F2AD: A4 01 LDY $01
1F2AF: 88 DEY
1F2B0: 10 D4 BPL $1F286

1F2B2: A4 00 LDY $00
1F2B4: B5 29 LDA $29,X
1F2B6: 18 CLC
1F2B7: 69 10 ADC #$10 ; height at which an object disappears (?)
1F2B9: B5 19 LDA $19,X
1F2BB: 69 00 ADC #$00
1F2BD: C9 01 CMP #$01
1F2BF: F0 08 BEQ $1F2C9

1F2C1: A9 F0 LDA #$F0
1F2C3: 19 C800 ORA $00C8,Y
1F2C6: 99 C800 STA $00C8,Y

1F2C9: B5 4D LDA $4D,X
1F2CB: 38 SEC
1F2CC: ED 2C07 SBC $072C
1F2CF: 99 CC00 STA $00CC,Y

1F2D2: 60 RTS

--------

Desert flying rocks

0x566D (Real : 0x565D)

565A: 20 EB96 JSR $96EB ; goto $56EB

56EB: A0 02 LDY #$02 ; Y = 2
56ED: B5 77 LDA $77,X
56EF: 30 01 BMI $56F2 ; if Negative, goto $56F2

56F1: 88 DEY ; Y - 1

56F2: 98 TYA ; A = Y
56F3: D5 66 CMP $66,X
56F5: F0 F3 BEQ $56EA ; if Zero, goto $56EA (60)
56F7: 68 PLA
56F8: 68 PLA

56F9: FE 8405 INC $0584,X ; gravity for projectiles when blocked
56FC: FE 8405 INC $0584,X ; Y+2 each frame

----

565D: 4C 3996 JMP $9639

0x5649 (ROM)
A9 FE 9D 84 05 ...
FE -> EF : flying rocks move diagonally up

FE = -1
EF = -10

FE 84 05 FE 84 05
A9 04 7D 84 05 EA

--------

Goriya's Boomerangs (All Colors)

0x56B1
88 -> C8 : Boomerangs fall down after reaching max distance

0x56B5
3F -> 44 : Boomerangs max acceleration is much more

0x56B7
20 : Boomerangs max velocity on return (?)

It probably means $66,X is related to X velocity

0x570C
FE -> DE : Boomerangs go diagonally up after hitting Link's shield
This is also used for Octorok's rocks, but not Molblin's spears (?)

--------

0x1E8E0

Sound of enemy killed (04)

--------

0xF113

Aha! We are in the core of the dialog display routine!

C9 05 : Compare Accumulator to 05

If A >= 05, stop adding new rows and start text display routine
Something like that

Decompile - From 0xF0E2 (Real 0xF0D2)

0xF0D2: AD 25 05 LDA $0525
0xF0D5: 0A ASL ; Arithmetic Shift Left (X2)
0xF0D6: A8 TAY
0xF0D7: B9 F3 B3 LDA $B3F3,Y ; pointer to line data (byte 1)
0xF0DA: 85 02 STA $02 ; store A in Zero Page 02
0xF0DC: B9 F4 B3 LDA $B3F4,Y ; pointer to line data (byte 2)
0xF0DF: 85 03 STA $03 ; store A in Zero Page 03
0xF0E1: B9 FD B3 LDA $B3FD,Y ; pointer to line data (byte 1)
0xF0E4: 85 04 STA $04 ; store A in Zero Page 04
0xF0E6: B9 FE B3 LDA $B3FE,Y ; pointer to line data (byte 2)
0xF0E9: 85 05 STA $05 ; store A in Zero Page 05
0xF0EB: A0 0D LDY #$0D ; Y = 0xD (decimal 13)

0xF0ED: B1 02 LDA ($02),Y
0xF0EF: 99 3E 05 STA $053E,Y
0xF0F2: B1 04 LDA ($04),Y
0xF0F4: 99 4C 05 STA $054C,Y
0xF0F7: 88 DEY ; Y - 1
0xF0F8: 10 F3 BPL $F0ED ; if (Y > 0) branch to $F0ED
0xF0FA: 20 0B B1 JSR $B10B ; jump to tile drawing routine ($F10B?)

0xF0FD: EE 25 05 INC $0525
0xF100: AD 25 05 LDA $0525
0xF103: C9 05 CMP #$05
0xF105: 90 03 BCC $F10A ; if (A >= 5) branch to $F10A
0xF107: EE 24 05 INC $0524
0xF10A: 60 RTS ; return to parent routine

--------

0xF10B: 20 F2 B2 JSR $B2F2 ; jump to 0xB2F2 ($F2F2?)

--------

0xF2F2: 20 4B B2 JSR $B24B ; jump to 0xB24B ($F24B?)

--------

0xF24B: AC 62 03 LDY $0362
0xF24E: A9 C0 LDA #$C0 ; A = C0
0xF250: 85 07 STA $07 ; store A in Zero Page 07
0xF252: A9 02 LDA #$02 ; A = 02
0xF254: 85 08 STA $08 ; store A in Zero Page 08
0xF256: A2 00 LDX #$00 ; X = 00
0xF258: AD 2C 07 LDA $072C
0xF25B: 18 CLC
0xF25C: 69 78 ADC #$78
0xF25E: 29 F0 AND #$F0
0xF260: 85 01 STA $01 ; store A in Zero Page 01
0xF262: AD 2A 07 LDA $072A
0xF265: 69 00 ADC #$00
0xF267: 85 00 STA $00 ; store A in Zero Page 00
0xF269: A5 01 LDA $01

--------

0xF667
Delay after dialog line with FD
Default : 0B

0xF66D
Delay after dialog line with FE
Default : 2D

The delay is stored in RAM at $0566

--------

0x1949A
04 -> 08 : Battle music but with slightly different tones

--------

Last Modification : 07-09-2007 (D-M-Y)

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