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Mega Man 2/ROM map: Difference between revisions

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===Atomic Fire===
===Atomic Fire===
* <tt>0x03DD61</tt> = Charge time between first and second level (Default: <tt>7D</tt>)
* <tt>0x03DD61</tt> = Charge time between first and second level (Default: <tt>7D</tt>)
* <tt>0x03DD67</tt> = Charge time between first and third level (Default: <tt>BB</tt>) [NOTE: if this value is lower than the value above, then that value is overwritten and it jumps straight to the third charge level]
* <tt>0x03DD67</tt> = Charge time between first and third level (Default: <tt>BB</tt>) [NOTE: If this value is lower than the value above, then that value is overwritten and it jumps straight to the third charge level.]
* <tt>0x03DE46</tt> <tt>-</tt> <tt>0x03DE48</tt> = Sound effect for Atomic Heat charge per level (Default: <tt>35</tt>, <tt>36</tt>, <tt>37</tt>)
* <tt>0x03DE46</tt> <tt>-</tt> <tt>0x03DE48</tt> = Sound effect for Atomic Heat charge per level (Default: <tt>35</tt>, <tt>36</tt>, <tt>37</tt>)
* <tt>0x03DE49</tt> <tt>-</tt> <tt>0x03DE50</tt> = First and third color of Atomic Heat per level, including non-charging (Default: <tt>0F15</tt>, <tt>3115</tt>, <tt>352C</tt>, <tt>3030</tt>)
* <tt>0x03DE49</tt> <tt>-</tt> <tt>0x03DE50</tt> = First and third color of Atomic Heat per level, including non-charging (Default: <tt>0F15</tt>, <tt>3115</tt>, <tt>352C</tt>, <tt>3030</tt>)

Revision as of 06:33, 21 February 2021

Chip tiny.png The following article is a ROM map for Mega Man 2.

Gameplay Data

Mega Man

  • 0x03891F = Mega Man's standstill x-velocity integer (Default: 00)
  • 0x038920 = Mega Man's inching x-velocity integer (Default: 00)
  • 0x038921 = Mega Man's walking x-velocity integer (Default: 01)
  • 0x038922 = Mega Man's jumping x-velocity integer (Default: 01)
  • 0x038923 = Mega Man's slip x-velocity integer (Default: 00)
  • 0x038924 = Mega Man's landing upper x-velocity integer (Default: 00)
  • 0x03892A = Mega Man's standstill x-velocity fraction (Default: 00)
  • 0x03892B = Mega Man's inching x-velocity fraction (Default: 20)
  • 0x03892C = Mega Man's walking x-velocity fraction (Default: 60)
  • 0x03892D = Mega Man's jumping x-velocity fraction (Default: 50)
  • 0x03892E = Mega Man's slip x-velocity fraction (Default: 80)
  • 0x03892F = Mega Man's landing x-velocity fraction (Default: 00)
  • 0x038A81 = Mega Man's jump height (Default: 80)

HP & Weapons Display

  • 0x02C142 = How fast the robot masters' health fills up (Default: 03)
  • 0x02E12B = How fast the fortress bosses' health fills up (Default: 03)
  • 0x0352B2 = How fast Mega Man's health fills up while paused (Default: 03)
  • 0x038315 = Maximum Energy for Mega Man (Default: 1C)
  • 0x03831B = How fast Mega Man's health fills up in game (Default: 07)
  • 0x03835A = How fast Mega Man's weapon energy fills up in game (Default: 07)
  • 0x03CF79 = X position for energy bar (Default: 18)
  • 0x03CF8F = X position for weapon bar (Default: 10)
  • 0x03CFB1 = X position for boss bar (Default: 28)
  • 0x03CFD8 = Graphics for Energy Bar (Default: 87) [NOTE: This define the leftmost tile (full HP graphic) and automatically picks to the right of it the remaining 4 tiles in descending order of HP, ex. 87>8B, DB>DF.]
  • 0x03CFF5 = Y position for 1/7 energy (Default: 18)
  • 0x03CFF6 = Y position for 2/7 energy (Default: 20)
  • 0x03CFF7 = Y position for 3/7 energy (Default: 28)
  • 0x03CFF8 = Y position for 4/7 energy (Default: 30)
  • 0x03CFF9 = Y position for 5/7 energy (Default: 38)
  • 0x03CFFA = Y position for 6/7 energy (Default: 40)
  • 0x03CFFB = Y position for 7/7 energy (Default: 48)

Sound Effects during Stage

  • 0x03524E = changing selections in menu, Mega Man forming (Default: 2F)
  • 0x0381E0 - 0x0381ED = Music played for each level
  • 0x038685 = Sound for Mega Man landing (Default: 29)
  • 0x03C59F = Sound for entering menu screen during action (Default: 32)
  • 0x03C802 = Sound effect for Mega Man beamed down (Default: 30)

Pause Menu

  • 0x0352AC = The amount of energy that E-Tanks set (Default: 1C)
  • 0x03539E = Sound effect for turning off menu during action (Default: 30)
  • 0x0353E8 = Starting Y position of the weapon icon sprites (Default: 44)
  • 0x035403 = X position of the weapon icon sprites (Default: 0C)
  • 0x03542C = Y position of Mega Man's health bar (Default: 44)
  • 0x03543D = Y position of the first set of weapon energy bars (Default: 54)
  • 0x03549C = Y position of the second set of weapon energy bars (Default: 44)
  • 0x03559E - 0x03562D = Pause menu tile layout

Arrow and NEXT Sprites

  • 0x03563C - 0x03564F (0x14) = sprite data
  • 0x03563C = Y position
  • 0x03563D = PPU Tile
  • 0x03563E = Palette, mirroring
  • 0x03563F = X position
format repeats

Weapon Icon Sprites

  • 0x035650 - 0x03565B (0xC) = sprite data
  • 0x035650 = P / Mega Buster (Default: 1F)
  • 0x035651 = H / Atomic Fire (Default: 9F)
  • 0x035652 = A / Air Shooter (Default: 9B)
  • 0x035653 = W / Leaf Shield (Default: 99)
  • 0x035654 = B / Bubble Lead (Default: 9D)
  • 0x035655 = Q / Quick Boomerang (Default: 9C)
  • 0x035656 = F / Flash Stopper (Default: 9A)
  • 0x035657 = M / Metal Blade (Default: 9E)
  • 0x035658 = C / Crash Bomber (Default: 10)
  • 0x035659 = 1 / Item 1 (Default: 15)
  • 0x03565A = 2 / Item 2 (Default: 16)
  • 0x03565B = 3 / Item 3 (Default: 17)

E-Tank Menu Sprite

  • 0x03565C - 0x03565F (0x4) = sprite data
  • 0x03565C = Y position
  • 0x03565D = PPU Tile
  • 0x03565E = Palette, mirroring
  • 0x03565F = X position

Extra Life Menu Sprite

  • 0x035660 - 0x03566F (0x10) = sprite data
  • 0x035660 = Y position
  • 0x035661 = PPU Tile
  • 0x035662 = Palette, mirroring
  • 0x035663 = X position
format repeats

Items

  • 0x0380D5 = Beginning amount of Health (Default: 1C)
  • 0x0382FD = Amount of HP large Energy returns (Default: 0A)
  • 0x038301 = Amount of HP small Energy returns (Default: 02)
  • 0x03806C = Amount of E-Tanks set after starting a new game (Default: 00)
  • 0x038382 = Maximum amount of E-Tanks you can carry (Default: 04) [NOTE: Carrying anything higher than 4 E-Tanks will generate bad passwords.]
  • 0x038390 = Maximum amount of lives you can carry (Default: 63) [NOTE: Due to how lives actually work, 00 is game over and 01 is actually 0 lives, so 63 would yield a 98 live limit instead of the usual 99.]
  • 0x03C1CB = Amount of E-Tanks set after continuing from a game over (Default: 00)

Power Ups

  • 0x03C289 = Power Up from Heat Man (Default: 01)
  • 0x03C28A = Power Up from Air Man (Default: 02)
  • 0x03C28B = Power Up from Wood Man (Default: 04)
  • 0x03C28C = Power Up from Bubble Man (Default: 08)
  • 0x03C28D = Power Up from Quick Man (Default: 10)
  • 0x03C28E = Power Up from Flash Man (Default: 20)
  • 0x03C28F = Power Up from Metal Man (Default: 40)
  • 0x03C290 = Power Up from Crash Man (Default: 80)
  • 0x03C291 = Item # from Heat Man (Default: 01)
  • 0x03C292 = Item # from Air Man (Default: 02)
  • 0x03C293 = Item # from Wood Man (Default: 00)
  • 0x03C294 = Item # from Bubble Man (Default: 00)
  • 0x03C295 = Item # from Quick Man (Default: 00)
  • 0x03C296 = Item # from Flash Man (Default: 04)
  • 0x03C297 = Item # from Metal Man (Default: 00)
  • 0x03C298 = Item # from Crash Man (Default: 00)

Screen Data

Stage Select

  • 0x02EE10 - 0x02F1CF = Stage select screen layout
  • 0x0340D8 = Routine for checking if a level has been cleared
  • 0x0340E3 = First level of Wily's castle (Default: 08)
  • 0x0340EC - 0x0340EF = Routine for checking if a level has been cleared
  • 0x0340F6 = Confirming selection
  • 0x034186 = First override palette for Boss posing screen (Default: 2C)
  • 0x03418B = Second override palette for Boss posing screen (Default: 11)
  • 0x0341BA = Preview boss music (Default: 0A)
  • 0x0342ED = Selection for Bubble Man cursor
  • 0x0344A9 - 0x0344B8 = Palette background for Stage Select Screen
  • 0x0344B9 - 0x0344C8 = Palette foreground for Stage Select Screen
  • 0x034551 = Beginning of Sprites for Stage Select Screen
  • 0x03462E = Cursor position for Bubble Man Y position
  • 0x034637 = Cursor position for Bubble Man X position
  • 0x03464F - 0x034650 = Palette data for Boss posing screen
  • 0x034651 - 0x03466E = Lines for Boss posing screen data (reverse order)
  • 0x034670 = Pointer for Bubble Man Stage from selection
  • 0x034671 = Pointer for Air Man Stage from selection
  • 0x034672 = Pointer for Quick Man Stage from selection
  • 0x034673 = Pointer for Wood Man Stage from selection
  • 0x034674 = Pointer for Crash Man Stage from selection
  • 0x034675 = Pointer for Flash Man Stage from selection
  • 0x034676 = Pointer for Metal Man Stage from selection
  • 0x034677 = Pointer for Heat Man Stage from selection
  • 0x035994 = Path velocity in Wily's castle map (Default: 03)
  • 0x038076 - 0x03807D = routine to see all weapons gained to go to Wily when selecting Start
  • 0x03C264 - 0x03C269 = routine to see all weapons gained to go to Wily after gaining a weapon

Weapon Gained Screens

  • 0x037D4A = How fast every letter gets revealed (Default: 07)

Mega Man

  • 0x0249FE - 0x024A8A (0x8D) = Sprite data
  • 0x0249FF = Y position
  • 0x024A00 = PPU Tile
  • 0x024A01 = Palette, mirroring
  • 0x024A02 = X position
format repeats

Dr. Light

  • 0x024A8B - 0x024AD7 (0x4D) = Sprite data
  • 0x024A8C = Y position
  • 0x024A8D = PPU Tile
  • 0x024A8E = Palette, mirroring
  • 0x024A8F = X position
format repeats

Title

  • 0x036235 = Sound effect for switching Normal and Difficult on Title (Default: 2F)
  • 0x0362D1 = Difficulty select arrow sprite tile (Default: A2)
  • 0x0362D2 = Palette, mirroring for arrow sprite (Default: 01)
  • 0x0362D4 = X position for arrow (Default: 30)
  • 0x0362D4 = Y position for arrow when selecting Normal (Default: 98)
  • 0x0362D5 = Y position for arrow when selecting Difficult (Default: A8)
  • 0x036322 = Removes all power ups and $00FD
  • 0x03686D = Sprite 1 for Title
  • 0x036877 = Sprite 2 for Title
  • 0x036AAF - 0x036ABE = Palette for sprites on Title
  • 0x036ACF - 0x036ADE = Palette background for Title
  • 0x037341 = Title Screen Last byte (reversed order)
  • 0x037700 = Title Screen First byte (reversed order)

Password Stuff

  • 0x03700B = Password Y position (A,1) (Default: 40)
  • 0x03700C = Password Y position (A,2) (Default: 40)
  • 0x03700D = Password Y position (A,3) (Default: 40)
  • 0x03700E = Password Y position (A,4) (Default: 40)
  • 0x03700F = Password Y position (A,5) (Default: 40)
  • 0x037010 = Password Y position (B,1) (Default: 50)
  • 0x037011 = Password Y position (B,2) (Default: 50)
  • 0x037012 = Password Y position (B,3) (Default: 50)
  • 0x037013 = Password Y position (B,4) (Default: 50)
  • 0x037014 = Password Y position (B,5) (Default: 50)
  • 0x037015 = Password Y position (C,1) (Default: 60)
  • 0x037016 = Password Y position (C,2) (Default: 60)
  • 0x037017 = Password Y position (C,3) (Default: 60)
  • 0x037018 = Password Y position (C,4) (Default: 60)
  • 0x037019 = Password Y position (C,5) (Default: 60)
  • 0x03701A = Password Y position (D,1) (Default: 70)
  • 0x03701B = Password Y position (D,2) (Default: 70)
  • 0x03701C = Password Y position (D,3) (Default: 70)
  • 0x03701D = Password Y position (D,4) (Default: 70)
  • 0x03701E = Password Y position (D,5) (Default: 70)
  • 0x03701F = Password Y position (E,1) (Default: 80)
  • 0x037020 = Password Y position (E,2) (Default: 80)
  • 0x037021 = Password Y position (E,3) (Default: 80)
  • 0x037022 = Password Y position (E,4) (Default: 80)
  • 0x037023 = Password Y position (E,5) (Default: 80)
  • 0x037024 = Password X position (A,1) (Default: 41)
  • 0x037025 = Password X position (A,2) (Default: 51)
  • 0x037026 = Password X position (A,3) (Default: 61)
  • 0x037027 = Password X position (A,4) (Default: 71)
  • 0x037028 = Password X position (A,5) (Default: 81)
  • 0x037029 = Password X position (B,1) (Default: 41)
  • 0x03702A = Password X position (B,2) (Default: 51)
  • 0x03702B = Password X position (B,3) (Default: 61)
  • 0x03702C = Password X position (B,4) (Default: 71)
  • 0x03702D = Password X position (B,5) (Default: 81)
  • 0x03702E = Password X position (C,1) (Default: 41)
  • 0x03702F = Password X position (C,2) (Default: 51)
  • 0x037030 = Password X position (C,3) (Default: 61)
  • 0x037031 = Password X position (C,4) (Default: 71)
  • 0x037032 = Password X position (C,5) (Default: 81)
  • 0x037033 = Password X position (D,1) (Default: 41)
  • 0x037034 = Password X position (D,2) (Default: 51)
  • 0x037035 = Password X position (D,3) (Default: 61)
  • 0x037036 = Password X position (D,4) (Default: 71)
  • 0x037037 = Password X position (D,5) (Default: 81)
  • 0x037038 = Password X position (E,1) (Default: 41)
  • 0x037039 = Password X position (E,2) (Default: 51)
  • 0x03703A = Password X position (E,3) (Default: 61)
  • 0x03703B = Password X position (E,4) (Default: 71)
  • 0x03703C = Password X position (E,5) (Default: 81)
  • 0x037056 = Password related (A,1)
  • 0x03709B = Password related (E,5)

Weapon Attributes

Mega Buster

  • 0x03DA7C - 0x03DA8F (0x14) = Routine
$DA6C:A5 27     LDA $0027 = #$00
$DA6E:29 02     AND #$02
$DA70:F0 2B     BEQ $DA9D
$DA72:A2 04     LDX #$04
$DA74:BD 20 04  LDA $0420,X @ $0460 = #$42
$DA77:10 07     BPL $DA80
$DA79:CA        DEX
$DA7A:E0 01     CPX #$01
$DA7C:D0 F6     BNE $DA74
$DA7E:F0 1D     BEQ $DA9D
$DA80:A9 24     LDA #$24
$DA82:20 51 C0  JSR $C051
$DA85:A0 00     LDY #$00
$DA87:20 E0 D3  JSR $D3E0
$DA8A:A9 0F     LDA #$0F
$DA8C:85 36     STA $0036 = #$00
$DA8E:A9 01     LDA #$01
$DA90:85 3D     STA $003D = #$00
$DA92:A6 2C     LDX $002C = #$03
$DA94:18        CLC
$DA95:7D D4 D3  ADC $D3D4,X @ $D414 = #$AD
$DA98:8D 00 04  STA $0400 = #$00
$DA9B:18        CLC
$DA9C:60        RTS
  • 0x03D4A7 = Velocity of Mega Man's buster shots (Default: 04) [NOTE: Shots that are too fast will not be able to properly register hits at all, so avoid going beyond around 0B.]
  • 0x03DA83 = Maximum number of buster shots on-screen (Default: 04) [NOTE: Values 00, 01, and 10 and beyond are all invalid, while 02 is actually 1, so 04 would actually mean 3 shots on-screen.]
  • 0x03DA91 = Sound effect for basic Mega Man shooting (Default: 24)

Atomic Fire

  • 0x03DD61 = Charge time between first and second level (Default: 7D)
  • 0x03DD67 = Charge time between first and third level (Default: BB) [NOTE: If this value is lower than the value above, then that value is overwritten and it jumps straight to the third charge level.]
  • 0x03DE46 - 0x03DE48 = Sound effect for Atomic Heat charge per level (Default: 35, 36, 37)
  • 0x03DE49 - 0x03DE50 = First and third color of Atomic Heat per level, including non-charging (Default: 0F15, 3115, 352C, 3030)
  • 0x03DE55 - 0x03DE57 = Amount of energy that Atomic Heat uses per shot per level (Default: 01, 06, 0A)

Air Shooter

  • 0x03DAC3 - 0x03DAF5 (0x33) = Routine
$DAB3:A5 27     LDA $0027 = #$00
$DAB5:29 02     AND #$02
$DAB7:F0 2B     BEQ $DAE4
$DAB9:A2 04     LDX #$04
$DABB:BD 20 04  LDA $0420,X @ $0480 = #$40
$DABE:30 24     BMI $DAE4
$DAC0:CA        DEX
$DAC1:E0 01     CPX #$01
$DAC3:D0 F6     BNE $DABB
$DAC5:A2 04     LDX #$04
$DAC7:86 01     STX $0001 = #$74
$DAC9:A0 02     LDY #$02
$DACB:20 E0 D3  JSR $D3E0
$DACE:A6 01     LDX $0001 = #$74
$DAD0:CA        DEX
$DAD1:E0 01     CPX #$01
$DAD3:D0 F2     BNE $DAC7
$DAD5:A9 3F     LDA #$3F
$DAD7:20 51 C0  JSR $C051
$DADA:38        SEC
$DADB:A5 9D     LDA $009D = #$16
$DADD:E9 02     SBC #$02
$DADF:85 9D     STA $009D = #$16
$DAE1:4C 8A DA  JMP $DA8A
$DAE4:38        SEC
$DAE5:60        RTS
  • 0x03DAE6 = Sound effect for Air Shooter (Default: 3F)
  • 0x03DAEE = Amount of energy that Air Shooter uses per shot (Default: 02)

Leaf Shield

  • 0x03DF0D = Sound effect for Leaf Shield turning (Default: 01)
  • 0x03DF1F = Sound effect for Leaf Shield appearing (Default: 31)
  • 0x03DF72 = Amount of energy that Leaf Shield uses per shot (Default: 03)

Bubble Lead

  • 0x03DB34 = Sound effect for Bubble Lead (Default: 24)
  • 0x03DB3D = Amount of Bubble Lead shots before reducing energy (Default: 02)

Quick Boomerang

  • 0x03DB4B - 0x03DB89 (0x3F) = Routine
$DB3B:A5 27     LDA $0027 = #$00
$DB3D:29 02     AND #$02
$DB3F:D0 0A     BNE $DB4B
$DB41:A5 AB     LDA $00AB = #$03
$DB43:C9 0B     CMP #$0B
$DB45:F0 04     BEQ $DB4B
$DB47:E6 AB     INC $00AB = #$03
$DB49:18        CLC
$DB4A:60        RTS
$DB4B:A2 05     LDX #$05
$DB4D:BD 20 04  LDA $0420,X @ $0425 = #$C3
$DB50:10 07     BPL $DB59
$DB52:CA        DEX
$DB53:E0 01     CPX #$01
$DB55:D0 F6     BNE $DB4D
$DB57:F0 1F     BEQ $DB78
$DB59:A0 05     LDY #$05
$DB5B:20 E0 D3  JSR $D3E0
$DB5E:A9 24     LDA #$24
$DB60:20 51 C0  JSR $C051
$DB63:E6 AC     INC $00AC = #$04
$DB65:A5 AC     LDA $00AC = #$04
$DB67:C9 08     CMP #$08
$DB69:D0 06     BNE $DB71
$DB6B:A9 00     LDA #$00
$DB6D:85 AC     STA $00AC = #$04
$DB6F:C6 A0     DEC $00A0 = #$09
$DB71:A9 00     LDA #$00
$DB73:85 AB     STA $00AB = #$03
$DB75:4C 8A DA  JMP $DA8A
$DB78:38        SEC
$DB79:60        RTS
  • 0x03DB54 = Fire rate velocity for Quick Boomerang (Default: 0B)
  • 0x03DB6F = Sound effect for Quick Boomerang (Default: 24)
  • 0x03DB78 = Amount of Quick Boomerang shots before reducing energy (Default: 08)

Quick Boomerang Mechanics

  • 0x03DFDE - 0x03E025 (0x48) = Routine
$DFCE:BD E0 04  LDA $04E0,X @ $04E3 = #$0D
$DFD1:C9 12     CMP #$12
$DFD3:B0 14     BCS $DFE9
$DFD5:38        SEC
$DFD6:BD 60 06  LDA $0660,X @ $0663 = #$DB
$DFD9:E9 4B     SBC #$4B
$DFDB:9D 60 06  STA $0660,X @ $0663 = #$DB
$DFDE:BD 40 06  LDA $0640,X @ $0643 = #$FE
$DFE1:E9 00     SBC #$00
$DFE3:9D 40 06  STA $0640,X @ $0643 = #$FE
$DFE6:4C 0F E0  JMP $E00F
$DFE9:D0 08     BNE $DFF3
$DFEB:BD 20 04  LDA $0420,X @ $0423 = #$C3
$DFEE:49 40     EOR #$40
$DFF0:9D 20 04  STA $0420,X @ $0423 = #$C3
$DFF3:BD E0 04  LDA $04E0,X @ $04E3 = #$0D
$DFF6:C9 23     CMP #$23
$DFF8:D0 04     BNE $DFFE
$DFFA:5E 20 04  LSR $0420,X @ $0423 = #$C3
$DFFD:60        RTS
$DFFE:18        CLC
$DFFF:BD 60 06  LDA $0660,X @ $0663 = #$DB
$E002:69 4B     ADC #$4B
$E004:9D 60 06  STA $0660,X @ $0663 = #$DB
$E007:BD 40 06  LDA $0640,X @ $0643 = #$FE
$E00A:69 00     ADC #$00
$E00C:9D 40 06  STA $0640,X @ $0643 = #$FE
$E00F:FE E0 04  INC $04E0,X @ $04E3 = #$0D
$E012:20 EF EE  JSR $EEEF
$E015:60        RTS
  • 0x03DFE2 = How far Quick Boomerang flies out (Default: 12)
  • 0x03DFFF = How far Quick Boomerang flies down before coming up (Default: 40)
  • 0x03E007 = How far Quick Boomerang flies back (Default: 23)

Flash Stopper

  • 0x03DC41 - 0x03DC5C (0x1C) = Routine
$DC31:A5 27     LDA $0027 = #$00
$DC33:29 02     AND #$02
$DC35:F0 1F     BEQ $DC56
$DC37:A2 02     LDX #$02
$DC39:AD 22 04  LDA $0422 = #$00
$DC3C:30 18     BMI $DC56
$DC3E:A0 08     LDY #$08
$DC40:20 E0 D3  JSR $D3E0
$DC43:A9 01     LDA #$01
$DC45:8D A6 05  STA $05A6 = #$01
$DC48:A9 21     LDA #$21
$DC4A:20 51 C0  JSR $C051
  • 0x03DC59 = Sound effect for Flash Stopper (Default: 21)

Flash Stopper Mechanics

  • 0x03E168 - 0x03E19F (0x38) = Routine
$E158:DE 20 06  DEC $0620,X @ $0680 = #$03
$E15B:D0 15     BNE $E172
$E15D:A9 0F     LDA #$0F
$E15F:9D 20 06  STA $0620,X @ $0680 = #$03
$E162:C6 A1     DEC $00A1 = #$1C
$E164:D0 0C     BNE $E172
$E166:5E 20 04  LSR $0420,X @ $0480 = #$00
$E169:A9 00     LDA #$00
$E16B:85 AA     STA $00AA = #$00
$E16D:A9 01     LDA #$01
$E16F:85 50     STA $0050 = #$00
$E171:60        RTS
$E172:A9 01     LDA #$01
$E174:85 AA     STA $00AA = #$00
$E176:A9 00     LDA #$00
$E178:85 50     STA $0050 = #$00
$E17A:85 4F     STA $004F = #$00
$E17C:A9 80     LDA #$80
$E17E:9D A0 04  STA $04A0,X @ $0500 = #$A6
$E181:18        CLC
$E182:65 1F     ADC $001F = #$00
$E184:9D 60 04  STA $0460,X @ $04C0 = #$00
$E187:AD 40 04  LDA $0440 = #$00
$E18A:69 00     ADC #$00
$E18C:9D 40 04  STA $0440,X @ $04A0 = #$B4
$E18F:60        RTS
  • 0x03D49D = Duration until weapon energy starts to drain (Default: 0F)

Metal Blade

  • 0x03DC5D - 0x03DC65 (0x9) = Routine
$DC4D:A9 0F     LDA #$0F
$DC4F:85 36     STA $0036 = #$00
$DC51:A9 03     LDA #$03
$DC53:4C 90 DA  JMP $DA90
$DC56:38        SEC
$DC57:60        RTS
  • 0x03DBC9 = Sound effect for Metal Blade (Default: 23)
  • 0x03DBD2 = Amount of Metal Blade shots before reducing energy (Default: 04)

Crash Bomber

  • 0x03DBA6 = Sound effect for Crash Bomber (Default: 24)
  • 0x03DB99 = Amount of energy that Crash Bomber uses per shot (Default: 04)
  • 0x03E089 = Sound effect for Crash Bomber clasping wall (Default: 2E)
  • 0x03E09C = Timer until Crash Bomber detonates (Default: 7E)
  • 0x03E0DA = Sound effect for Crash Bomber exploding (Default: 2B)

Items

  • 0x03DC85 = Amount of energy that Item 1 uses per use (Default: 02)
  • 0x03E230 = Amount of time before subtracting one energy from Item 2 (Default: 13)
  • 0x03E34C = Amount of time before subtracting one energy from Item 3 (Default: 1F)

Enemy Behavior

Attack Power Table

  • 0x02E9C4 = Wood Man's contact damage (Default: 08)
  • 0x02E9C8 = Flash Man's contact damage (Default: 06)
  • 0x03ED76 = Crabbot's contact damage (Default: 04)
  • 0x03ED78 = Grand Croaker's contact damage (Default: 04)
  • 0x03ED79 = Petit Croaker's contact damage (Default: 01)
  • 0x03ED82 = Bubble Bat's contact damage (Default: 04)
  • 0x03ED83 = Robo-Rabbit's contact damage (Default: 04)
  • 0x03ED84 = Robo-Rabbit's projectile carrot (Default: 02)
  • 0x03ED85 = Hot Dog's contact damage (Default: 08)
  • 0x03ED87 = Hot Dog's projectile fire stream (Default: 04)
  • 0x03ED89 = Mecha Monkey's contact damage (Default: 04)
  • 0x03ED8B = Atomic Chicken's contact damage (Default: 04)
  • 0x03EDA1 = Returning Sniper Joe's projectile pellet (Default: 02)
  • 0x03EDA4 = Pipi's contact damage (Default: 04)
  • 0x03EDA6 = Pipi's egg projectile (Default: 04)
  • 0x03EDA8 = Copipi's contact damage (Default: 02)
  • 0x03EDB7 = Crazy Cannon's contact damage (Default: 04)
  • 0x03EDB9 = Crazy Cannon's projectile pellet (Default: 02)
  • 0x03EDBA = Sniper Armor's contact damage (Default: 08)
  • 0x03EDBB = Sniper Armor's projectile pellet (Default: 04)
  • 0x03EDBC = Schworm's contact damage (Default: 02)
  • 0x03EDBD = Schworm's projectile snake rod (Default: 02)
  • 0x03EDCD = Wood Man's Leaf Shield (Default: 08)
  • 0x03EDCE = Wood Man's Falling Leaves (Default: 04)

Heat Man

  • 0x02C16E - 0x02C--- = Routine for attack
  • 0x02C207 = Projectile 1's y-velocity (Default: 07)
  • 0x02C208 = Projectile 2's y-velocity (Default: 05)
  • 0x02C209 = Projectile 3's y-velocity (Default: 03)
  • 0x02C20A = Projectile 1's x-velocity (Default: 3A) [NOTE: Unlike other instances of velocity, lower values for these x-velocities means faster velocity.]
  • 0x02C20B = Projectile 2's x-velocity (Default: 2E)
  • 0x02C20C = Projectile 3's x-velocity (Default: 1C)
  • 0x02C1BB = Projectile type (Default: 58)
  • 0x02C1A1 = Number of projectiles thrown (Default: 02) [NOTE: Extra shots tend to be glitchy.]
  • 0x02C253 = Charge x-velocity (Default: 04)
  • 0x02C29D = Delay 1 before charge (Default: 1F) [NOTE: After Heat Man is damaged, he will wait before charging. This and the two values below are randomly chosen as the delay interval.]
  • 0x02C29E = Delay 2 before charge (Default: 3E)
  • 0x02C29F = Delay 3 before charge (Default: 5D)

Flash Man

  • 0x02C966 - 0x02CAF8 = Routine for attack
  • 0x02C97D = Walk velocity fraction (Default: 06)
  • 0x02C982 = Walk velocity integer (Default: 01)
  • 0x02C98B = Delay before Time Stopper (Default: BB) [NOTE: It only counts down while the boss is walking.]
  • 0x02CA09 = Number of projectiles to shoot (Default: 06)
  • 0x02CA52 = Length of time stopper/projectile frequency? (Default: 06) [NOTE: Uncertain about value's function; alter it at own risk.]
  • 0x02CA71 = Projectile type (Default: 35)
  • 0x02CA81 = Projectile x-velocity (Default: 08)
  • 0x02CAC6 = Jump x-velocity integer (Default: 00)
  • 0x02CACE = Jump y-velocity integer (Default: 04)

Metal Man

  • 0x02CBB5 = (06) Jump Height 1; higher than 07 bonks the ceiling
  • 0x02CBB6 = (05) Jump Height 2
  • 0x02CBB7 = (04) Jump Height 3
  • 0x02CC1D = (06) Metal blade frequency? changes behavior if different than 06
  • 0x02CC29 = (20) Sound of Metal Blade
  • 0x02CC2D = () Projectile type
  • 0x02CC3F = (04) Speed of Metal Blade

Crash Man

  • 0x02CCF2 = (47) Walk velocity fraction
  • 0x02CCF7 = (01) Walk velocity integer
  • 0x02CD07 = (27) Jump behavior*
*If changed to 0x17, he always jumps. If any value other than 0x27 or 0x17, he doesn't react to your attacks with a jump anymore.
  • 0x02CD2A = (06) Jump velocity integer
  • 0x02CDAF = (44) Jump velocity fraction
  • 0x02CDD3 = (5E) Not sure, change to another value to have him always shoot when jumping
  • 0x02CDEE = (06) Crash Bomber x-velocity integer

Quick Man

  • 0x02C86E = (03) Number of boomerangs
  • 0x02C872 = (59) Projectile Type
  • 0x02C882 = (25) Boomerang delay in frames before second motion
  • 0x02C887 = (04) Boomerang velocity first motion
  • 0x03B726 = (04) Boomerang velocity second motion
  • 0x02C8A3 = (07) Middle jump y-velocity
  • 0x02C8A4 = (08) High jump y-velocity
  • 0x02C8A5 = (04) Low jump y-velocity
  • 0x02C8E4 = (3E) Running time in frames
  • 0x02C8DF = (02) Running velocity integer

Bubble Man

  • 0x02C70B = (FF) Landing speed integer
  • 0x02C6D3 = (01) Rising speed integer
  • 0x02C74F = (5A) Gun projectile type

Wood Man

  • 0x02C537 = (12) Delay between rising leaves
  • 0x02C5DD = (04) Jump y-velocity integer
  • 0x02C5E2 = (01) Jump x-velocity integer
  • 0x02C5A9 = (04) Leaf Shield launch x-velocity integer
  • 0x02C553 = (03) Number of falling leaves
  • 0x02C576 = (02) Falling leaf x-velocity integer
  • 0x02C567 = (20) Falling leaf y-pos start
  • 0x02C522 = () Leaf Shield projectile type
  • 0x02C557 = () Falling leaves projectile type
  • 0x02C542 = () Rising leaves projectile type
  • 0x03DA34 = () Leaf Shield fall speed???
  • 0x03D8F6 = (02) ??*
*Change to 0x06 for an interesting leaf shield pattern
  • 0x03B855 = (20) Leaf fall speed?*
*Decrease value to increase speed. At 0x40, it doesn't fall. Change to a high number to instantly despawn leaves for a fast pattern.

Air Man

  • 0x02C2F3 to 0x02C50A = Routine for attack
  • 0x02C30C = (03) Number of tornado patterns before jump phase
  • 0x02C393 to 0x02C428 (0096) = Tornado properties
    • 0x02C393 to 0x02C3B0 (001E) = y-velocity fractions*
      • 0x02C393 to 0x02C398 (0006) = Pattern #1 tornadoes
      • 0x02C399 to 0x02C39E (0006) = Pattern #2 tornadoes
      • 0x02C39F to 0x02C3A4 (0006) = Pattern #3 tornadoes
      • 0x02C3A5 to 0x02C3AA (0006) = Pattern #4 tornadoes
      • 0x02C3AB to 0x02C3B0 (0006) = Pattern #5 tornadoes
    • 0x02C3B1 to 0x02C3CE (001E) = y-velocity integers*
    • 0x02C3CF to 0x02C3EC (001E) = x-velocity fractions*
    • 0x02C3ED to 0x02C40A (001E) = x-velocity integers*
    • 0x02C40B to 0x02C428 (001E) = delay before tornado finishes deploying*
*Air Man has 5 possible tornado patterns, each with 6 tornadoes. In each 30-byte block of properties, the first 6 bytes correspond to the tornadoes in the first pattern, the next 6 bytes correspond to the tornadoes in the second pattern, etc.
  • 0x02C4DD = (E6) First jump y-velocity fraction
  • 0x02C4DE = (76) Second jump y-velocity fraction
  • 0x02C4E0 = (04) First jump y-velocity integer
  • 0x02C4E1 = (07) Second jump y-velocity integer
  • 0x02C4E3 = (39) First jump x-velocity fraction
  • 0x02C4E4 = (9A) Second jump x-velocity fraction
  • 0x02C4E6 = (01) First jump x-velocity integer
  • 0x02C4E7 = (01) Second jump x-velocity integer

Wily Machine

  • 0x02DA2E = (02) Phase 1 weakness #1 to disable*
  • 0x02DA32 = (05) Phase 1 weakness #2 to disable*
  • 0x02DA3A = (01) Phase 2 weakness to disable*
*Only one damage table is provided for Wily Machine's weaknesses. However, during each phase of fighting Wily Machine, the game manually ignores damage when you have certain weapons equipped, giving the impression that each phase has different weaknesses. Normally, in Phase 1, damage is negated if you have Air Shooter or Quick Boomerang equipped. In Phase 2, damage is negated if you have Atomic Fire equipped.

Damage Values

The data below shows how much damage each boss will take from a specific weapon. In the ROM, each weapon is grouped and is separate from the Robot Master data. This is based on the USA version of Mega Man 2. Japanese values are located further up in the ROM.

It should be noted that any hex value from 00 to 79 (0 to 127) deals damage to the enemy, whereas hex values ranging from 80 to FF (128 to 255) will fully heal the enemy.

(Credit to Overseer190)

Mega Buster

  • 0x02E952: HeatMan (Default is 02)
  • 0x02E953: AirMan (Default is 02)
  • 0x02E954: WoodMan (Default is 01)
  • 0x02E955: BubbleMan (Default is 01)
  • 0x02E956: QuickMan (Default is 02)
  • 0x02E957: FlashMan (Default is 02)
  • 0x02E958: MetalMan (Default is 01)
  • 0x02E959: CrashMan (Default is 01)
  • 0x02E95A: Mecha Dragon (Default is 01)
  • 0x02E95B: Picopico-kun (Default is 02)
  • 0x02E95C: Guts Tank (Default is 02)
  • 0x02E95D: Boobeam Trap (Default is 00)
  • 0x02E95E: Wily Machine 2 (Default is 02)
  • 0x02E95F: Alien (Default is FF)

Atomic Fire

The game treats this weapon differently than the others because of its charging feature. An uncharged shot directly takes from the Mega Buster damage chart as seen above. A partially charged shot takes the Mega Buster table as well, but multiplies the value by 2 and always rounds up to the nearest whole number. A charged shot uses its own table as seen below...

  • 0x02E960: HeatMan (Default is FF)
  • 0x02E961: AirMan (Default is 06)
  • 0x02E962: WoodMan (Default is 0E)
  • 0x02E963: BubbleMan (Default is 00)
  • 0x02E964: QuickMan (Default is 0A)
  • 0x02E965: FlashMan (Default is 06)
  • 0x02E966: MetalMan (Default is 04)
  • 0x02E967: CrashMan (Default is 06)
  • 0x02E968: Mecha Dragon (Default is 08)
  • 0x02E969: Picopico-kun (Default is 02)
  • 0x02E96A: Guts Tank (Default is 08)
  • 0x02E96B: Boobeam Trap (Default is 00)
  • 0x02E96C: Wily Machine 2 (Default is 0E)
  • 0x02E96D: Alien (Default is FF)

Air Shooter

  • 0x02E96E: HeatMan (Default is 02)
  • 0x02E96F: AirMan (Default is 00)
  • 0x02E970: WoodMan (Default is 04)
  • 0x02E971: BubbleMan (Default is 00)
  • 0x02E972: QuickMan (Default is 02)
  • 0x02E973: FlashMan (Default is 00)
  • 0x02E974: MetalMan (Default is 00)
  • 0x02E975: CrashMan (Default is 0A)
  • 0x02E976: Mecha Dragon (Default is 00)
  • 0x02E977: Picopico-kun (Default is 00)
  • 0x02E978: Guts Tank (Default is 00)
  • 0x02E979: Boobeam Trap (Default is 00)
  • 0x02E97A: Wily Machine 2 (Default is 01)
  • 0x02E97B: Alien (Default is FF)

Leaf Shield

  • 0x02E97C: HeatMan (Default is 00)
  • 0x02E97D: AirMan (Default is 08)
  • 0x02E97E: WoodMan (Default is FF)
  • 0x02E97F: BubbleMan (Default is 00)
  • 0x02E980: QuickMan (Default is 00)
  • 0x02E981: FlashMan (Default is 00)
  • 0x02E982: MetalMan (Default is 00)
  • 0x02E983: CrashMan (Default is 00)
  • 0x02E984: Mecha Dragon (Default is 00)
  • 0x02E985: Picopico-kun (Default is 00)
  • 0x02E986: Guts Tank (Default is 00)
  • 0x02E987: Boobeam Trap (Default is 00)
  • 0x02E988: Wily Machine 2 (Default is 00)
  • 0x02E989: Alien (Default is FF)

Bubble Lead

  • 0x02E98A: HeatMan (Default is 06)
  • 0x02E98B: AirMan (Default is 00)
  • 0x02E98C: WoodMan (Default is 00)
  • 0x02E98D: BubbleMan (Default is 00)
  • 0x02E98E: QuickMan (Default is 00)
  • 0x02E98F: FlashMan (Default is 02)
  • 0x02E990: MetalMan (Default is 00)
  • 0x02E991: CrashMan (Default is 00)
  • 0x02E992: Mecha Dragon (Default is 00)
  • 0x02E993: Picopico-kun (Default is 00)
  • 0x02E994: Guts Tank (Default is 00)
  • 0x02E995: Boobeam Trap (Default is 01)
  • 0x02E996: Wily Machine 2 (Default is 00)
  • 0x02E997: Alien (Default is 01)

Quick Boomerang

  • 0x02E998: HeatMan (Default is 02)
  • 0x02E999: AirMan (Default is 02)
  • 0x02E99A: WoodMan (Default is 00)
  • 0x02E99B: BubbleMan (Default is 02)
  • 0x02E99C: QuickMan (Default is 00)
  • 0x02E99D: FlashMan (Default is 00)
  • 0x02E99E: MetalMan (Default is 04)
  • 0x02E99F: CrashMan (Default is 00)
  • 0x02E9A0: Mecha Dragon (Default is 01)
  • 0x02E9A1: Picopico-kun (Default is 00)
  • 0x02E9A2: Guts Tank (Default is 02)
  • 0x02E9A3: Boobeam Trap (Default is 00)
  • 0x02E9A4: Wily Machine 2 (Default is 01)
  • 0x02E9A5: Alien (Default is FF)

Crash Bombs

ROM address "0x02E9B2" is unused as Boobeam Traps take 4 damage from being hit by a weapon that does not have a "no hit" flag. The location of this flag is unknown...

  • 0x02E9A6: HeatMan (Default is FF)
  • 0x02E9A7: AirMan (Default is 00)
  • 0x02E9A8: WoodMan (Default is 02)
  • 0x02E9A9: BubbleMan (Default is 02)
  • 0x02E9AA: QuickMan (Default is 04)
  • 0x02E9AB: FlashMan (Default is 00)
  • 0x02E9AC: MetalMan (Default is 03)
  • 0x02E9AD: CrashMan (Default is 00)
  • 0x02E9AE: Mecha Dragon (Default is 01)
  • 0x02E9AF: Picopico-kun (Default is 00)
  • 0x02E9B0: Guts Tank (Default is 01)
  • 0x02E9B1: Boobeam Trap (Default is 01*)
  • 0x02E9B2: Wily Machine 2 (Default is 01)
  • 0x02E9B3: Alien (Default is FF)

Metal Blade

  • 0x02E9B4: HeatMan (Default is 01)
  • 0x02E9B5: AirMan (Default is 00)
  • 0x02E9B6: WoodMan (Default is 02)
  • 0x02E9B7: BubbleMan (Default is 04)
  • 0x02E9B8: QuickMan (Default is 00)
  • 0x02E9B9: FlashMan (Default is 04)
  • 0x02E9BA: MetalMan (Default is 0E)
  • 0x02E9BB: CrashMan (Default is 00)
  • 0x02E9BC: Mecha Dragon (Default is 00)
  • 0x02E9BD: Picopico-kun (Default is 00)
  • 0x02E9BE: Guts Tank (Default is 00)
  • 0x02E9BF: Boobeam Trap (Default is 00)
  • 0x02E9C0: Wily Machine 2 (Default is 01)
  • 0x02E9C1: Alien (Default is FF)
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