View source for Dragon Warrior

'''''Dragon Warrior''''' is an RPG. You play the last descendant of the line of Erdrick in the land of Alefgard. You must fight enemies to gain gold and experience which will let you buy better equipment and become more powerful. You also have to rescue princess Gwaelin, find several relics to make a bridge, and defeat the evil Dragonlord. The game is very attractive for such an early RPG, but too much time is spent grinding to power yourself up.

==Easy Cheats==
{{CheatTop}}
{{Cheat|HitPoints-Infinite|00C5|FF|-|Infinite Hit Points}}
{{Cheat|Magic|00C6|FF|-|Infinite Magic Points}}
{{Cheat|Money-Infinite|00BD|FF|-|Infinite Gold}}
{{Cheat|Weapon|00BE|FF|-|Have Best Equipment}}
{{Cheat|Strength|00E2|00|-|Kill Enemies In One Hit}}
{{Cheat|Item|00BF|09|-|Infinite Magic Keys}}
{{Cheat|Magic|00CE<br />00CF|FF<br />33|-<br />-|All Spells (1/2)<br />All Spells (1/2)}}
{{Cheat|Magic|00DB|FF|-|Repel Lasts Forever}}
{{Cheat|Powerup|00D0|07|-|See In the Dark}}
{{Cheat|Armor|CDE3|00|02|No Damage From Swamps}}
{{Cheat|Armor|CE48|00|0F|No Damage From Barriers}}
{{Cheat|Money|E344|FF|78|First Chest Has 255 Gold}}
{{CheatBottom}}

==North America==
Note: Two versions of Dragon Warrior were released in North America. Differences are labeled.
[[File:Dragon Warrior.png|256px|right]]

===Memory Addresses===
 0000 - Used for manipulating variables (doing damage, gaining xp and gp, etc.)
 0047 - Controller 1 poll
 
 008E - Map X Pos
 008F - Map Y Pos
 
 00B5-00B8 - First 4 characters of player's name
 00B9 - Loaded with #FA at game load, and doesn't seem to change
 00BA - Experience: x1
 00BB - Experience: x256
 00BC - Gold: x1
 00BD - Gold: x255
 00BE - Equipment (See Equipment List below)
 00BF - Magic Keys
 00C0 - Herbs (00-09)
 00C1 - Items 2/1 (See Item List below)
 00C2 - Items 4/3
 00C3 - Items 6/5
 00C4 - Items 8/7
 00C5 - Hit Points
 00C6 - Magic Points
 00C7 - Level
 00C8 - Strength place holder for Status (The following don't save to the character)
 00C9 - Agility place holder for Status
 00CA - Max HP place holder for Status
 00CB - Max MP place holder for Status
 00CC - Attack Power place holder for Status
 00CD - Defense Power place holder for Status
 00CE - Spells Bit Flag (Gets overwritten from battery)
 	01 - Heal
 	02 - Hurt
 	04 - Sleep
 	08 - Radiant
 	10 - Stopspell
 	20 - Outside
 	40 - Return
 	80 - Repel
 00CF - Misc Player Variables Bit Flag
 	01 - Healmore spell
 	02 - Hurtmore spell
 	04 - 
 	08 - 
 	10 - Dragon Scale
 	20 - Fighter's Ring
 	40 - Cursed Belt
 	80 - Cursed Necklace
 00D0 - Vision distance in the dark (Dark = 1, Torch = 3, Radiant = 7/5/3) - Note: Max value = 7, greater values do not reveal more, just graphical glitches
 
 00D1 - Used for palette shifting while scrolling vertically
 00D2 - Cursor X
 00D3 - Cursor Y
 
 00D7 - Last chosen menu item (00-09, FF - None)
 00D8 - Highlighted menu item Col 1 (00-03)
 00D9 - Highlighted menu item Col 2 (00-09)
 00DA - Radiant Spell Countdown
 00DB - Fairy Water / Repel Countdown (Even for fairy water, odd for repel)
 
 00DE - Monster Injury Flash Countdown
 00DF - Carrying Princess (08 - No, 09 - Yes)
 00E0 - Tile walking on
 	00 - Grass
 	01 - Desert
 	02 - Hills
 	03 - Stairs Up
 	04 - Tiles
 	05 - Stairs Down
 	06 - Swamp
 	07 - Town
 	08 - Cave
 	09 - Castle
 	0A - Bridge
 	0B - Forest
 	0C - Chest
 	0D - Force Field
 
 00E2 - Enemy HP
 
 00E5 - Message Speed (00 - Fast, 01 - Normal, 02 - Slow) - Note: Can increase beyond normal means for -really- slow text
 
 00E6-00FF - Sound Variables
 
 0110-01FF - Stack
 0200-02FF - Sprite Memory
 0400-07BF - Tile layout for screen menus
 
 E344 - Initial Chest Gold (78)

====Item List====
Items are stored two to a byte. Item 1 is right nybble, item 2 is the left nybble. So if you wanted your first two items to be a torch and the death necklace, you set 00C1 to B1.

 1 - Torch
 2 - Fairy Water
 3 - Wings
 4 - Dragon's Scale
 5 - Fairy Flute
 6 - Fighter's Ring
 7 - Erdrick's Token
 8 - Gwaelin's Love
 9 - Cursed Belt
 A - Silver Harp
 B - Death Necklace
 C - Stones of Sunlight
 D - Staff of Rain
 E - Rainbow Drop
 F - Herb

====Equipment List====
The designers of the equipment didn't base it on the usual bit flag (using powers of 2) for each item. However, since you can't have more than one type of equipment at a time, they were able to fit all of the items in a single byte. Simply take one item from each list, add them together, and the sum is the equipment value.

 00 - Nothing
 
 01 - Small Shield
 02 - Large Shield
 03 - Silver Shield
 
 04 - Clothes
 08 - Leather Armor
 0C - Chain Mail
 10 - Half Plate Armor
 14 - Full Plate Armor
 18 - Magic Armor
 1C - Erdrick's Armor
 
 20 - Bamboo Pole
 40 - Club
 60 - Copper Sword
 80 - Hand Axe
 A0 - Broad Sword
 C0 - Flame Sword
 E0 - Erdrick's Sword

===Code===
====Swamp Damage====
This subroutine is called when the player takes damage from swamps.

 CDDF:A5 C5     LDA $00C5        ; Load Hit Points into A.
 CDE1:38        SEC              ; Set Carry Flag
 CDE2:E9 02     SBC #$02         ; Subtract #02 from A.
 CDE4:B0 02     BCS $CDE8        ; If A didn't go below #00, goto CDE8
 CDE6:A9 00     LDA #$00         ; A went below #00, set it to #00.
 CDE8:85 C5     STA $00C5        ; Store A into Hit Points.
 CDEA:20 74 FF  JSR $FF74

====Barrier Damage====
This subroutine is called when the player takes damage from barriers.
 CE44:A5 C5     LDA $00C5        ; Load Hit Points into A.
 CE46:38        SEC              ; Set the Carry Flag.
 CE47:E9 07     SBC #$0F         ; Subtract #0F from A.
 CE49:B0 04     BCS $CE4F        ; If A didn't go below #00, goto CE4F
 CE4B:A9 00     LDA #$00         ; A went below #00, set it to #00.
 CE4D:F0 00     BEQ $CE4F        ; If A is equal to #00, goto CE4F (Compiler mistake?)
 CE4F:85 C5     STA $00C5        ; Store A into Hit Points.

====Get Initial Attack Damage====
Takes the player's attack power and subtracts a pseudo-random amount and stores the result in A.
 E649:A5 CC     LDA $00CC        ; Load Attack Power.
 E64B:38        SEC              ; 
 E64C:E5 41     SBC $0041        ; Subtract $0041 ?
 E64E:4C 64 E6  JMP $E664        ; Goto Modify Attack Damage.

====Modify Attack Damage====
Takes whatever is in A and does that amount of damage to the enemy.
 E664:85 00     STA $0000
 E666:A9 00     LDA #$00
 E668:85 01     STA $0001
 E66A:24 DF     BIT $00DF
 E66C:70 2C     BVS $E69A
 E66E:20 5B C5  JSR $C55B

====Damage Player====
Called when the player is to take damage. The amount of damage is stored in $0000.
 ED25:A9 00     LDA #$00         ; Clear A.
 ED27:85 01     STA $0001        ; Clear $0001.
 ED29:A5 C5     LDA $00C5        ; Load Hit Points into A.
 ED2B:38        SEC              ; 
 ED2C:E5 00     SBC $0000        ; Subtract damage from Hit Points.
 ED2E:B0 02     BCS $ED32        ; If result > 0 (carry is set)...
 ED30:A9 00     LDA #$00         ; Load A with 0.
 ED32:85 C5     STA $00C5        ; Store A into Hit Points.

===Text===
''Dragon Warrior'' has a complicated character set. There are three sets, two of them overlap each other to save space. They are then interpreted at a bit level when drawn, it seems like only one of them is actually used though because a third, more straight forward, set is used for all the dialogue.

====Title====
 00=0
 01=1
 02=2
 03=3
 04=4
 05=5
 06=6
 07=7
 08=8
 09=9
 24=A
 25=B
 26=C
 27=D
 28=E
 29=F
 2A=G
 2B=H
 2C=I
 2D=J
 2E=K
 2F=L
 30=M
 31=N
 32=O
 33=P
 34=Q
 35=R
 36=S
 37=T
 38=U
 39=V
 3A=W
 3B=X
 3C=Y
 3D=Z
 5F= 
 60=!
 61=.
 62=©
 63=-

====Game====
 00=0
 01=1
 02=2
 03=3
 04=4
 05=5
 06=6
 07=7
 08=8
 09=9
 0A=a
 0B=b
 0C=c
 0D=d
 0E=e
 0F=f
 10=g
 11=h
 12=i
 13=j
 14=k
 15=l
 16=m
 17=n
 18=o
 19=p
 1A=q
 1B=r
 1C=s
 1D=t
 1E=u
 1F=v
 20=w
 21=x
 22=y
 23=z
 24=A
 25=B
 26=C
 27=D
 28=E
 29=F
 2A=G
 2B=H
 2C=I
 2D=J
 2E=K
 2F=L
 30=M
 31=N
 32=O
 33=P
 34=Q
 35=R
 36=S
 37=T
 38=U
 39=V
 3A=W
 3B=X
 3C=Y
 3D=Z
 3E=“
 3F=”
 40=’
 41=*
 42=→
 43=↓
 44=:
 45=…
 47=.
 48=,
 49=-
 4B=?
 4C=!
 4D=;
 4E=)
 4F=(
 50=‘
 51=´
 52=.’
 53='
 54=´
 5F= 
 F8=<player>


==Japan==
[[File:Dragon Quest.png|256px|right]]


==Links==
* [http://www.gamefaqs.com/nes/563408-dragon-warrior/faqs/61640 gamefaqs.com/nes/563408-dragon-warrior/faqs/61640] - Detailed breakdown of the game's algorithms including, reversed engineered source code.


[[Category:Games]]