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Mega Man 2/RAM map: Difference between revisions

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{{rammap|game=Mega Man 2}}
{{rammap|game=Mega Man 2}}


===Misc.===
==General==
* $0022 - Vertical position of screen scrolling
{| border="1" cellpadding="1"
* $0023 - Controller 1 Poll
|'''RAM'''  || '''Function''' || '''Details'''
* $0025 - Controller 1 Mirror
|-
* $0027 - Controller 1 Poll, only changes on first frame of state change. Crash Man checks this for jump code.
| $001B || Camera state ||
* $002A - Area selected
{|border="1" cellpadding="0"
* $0030 - Gravity.
|$00||Default
* $004B - Invincibility timer (when this is above $00, invincibility frames will start and this will count down at a rate of $01 per frame).
|-
|$01||Changing the nametable (E.g. scrolling within an area, creating the pause menu)
|-
|$02||Freeze before and after scrolling to a new area
|-
|$80||Scrolling vertically
|-
|}
|-
| $001F || Camera X position ||
|-
| $0020 || Camera X screen || When $001F gets larger than $FF, this value increases by $01.
|-
| $0022 || Camera Y position ||
|-
| $0023 || Controller 1 Poll || [[#controller|(1)]]
|-
| $0025 || Controller 1 Mirror || [[#controller|(1)]]
|-
| $0027 || Controller 1 Poll || Only changes on first frame of state change. Crash Man checks this for jump code. [[#controller|(1)]]
|-
| $0030 || Gravity ||
|-
| $004B || Invincibility timer || When above $00, invincibility frames will start and this will count down at a rate of $01 per frame.
|-
| $00CB || Difficulty setting || When an enemy takes damage, if this value is $00 (Normal) the damage given will be bitshifted left, doubling it.
|-
| $002A || Stage select cursor position || $00 is Dr. Wily, $01-$08 goes clockwise starting from Bubble Man.
|-
| $06C1 || Boss HP ||
|-
|}


===Sound===
==Sound==
* $0066 - Sound effects for $0580 : $01 - play
{| border="1" cellpadding="1"
* $0067 - Music playing for $0000 : $01 - play
|'''RAM'''  || '''Function''' || '''Details'''
* $0580 - Sound to play for $0066
|-
| $0066 || Sound effects strobe || Write $01 to play the SFX ID in address $0580
|-
| $0067 || Music strobe || Write $01 to play the Music in address $0000
|-
| $0580 || Sound effect queue ||
|-
|}


===Stats===
==Player properties==
* $009A - Unlocked Weapons
{| border="1" cellpadding="1"
  0000 0001 = $80 = 128 - Atomic Fire (Heatman)
|'''RAM'''  || '''Function''' || '''Details'''
0000 0010 = $40 =  64 - Air Shooter (Airman)
|-
0000 0100 = $20 =  32 - Leaf Shield (Woodman)
| $06C0 || Mega Man's HP ||
0000 1000 = $10 =  16 - Bubble Lead (Bubbleman)
|-
0001 0000 = $08 =  8 - Quick Boomerang (Quickman)
| $0460 || Mega Man's X location ||
0010 0000 = $04 =  4 - Time Stopper (Flashman)
|-
0100 0000 = $02 =  2 - Metal Blade (Metalman)
| $04A0 || Mega Man's Y location ||
1000 0000 = $01 =  1 - Crash Bomb (Crashman)
|-
* $009B - Item #s
| $0036 || Shooting pose timer ||
0000 0001 = $80 = 128 - Item 1 (Floating Platform)
|-
0000 0010 = $40 =  64 - Item 2 (Horizontal Platform)
| $0032
0000 0100 = $20 =  32 - Item 3 (Vertical Platform)
|Tile type Mega Man is standing on (feet)
* $009C - Number of times Atomic Fire (Heatman) can be used
|rowspan="3"|
* $009D - Number of times Air Shooter (Airman) can be used
{|border="1" cellpadding="1"
* $009E - Number of times Leaf Shield (Woodman) can be used
||'''Value'''  || '''Type'''
* $009F - Number of times Bubble Lead (Bubbleman) can be used
|-
* $00A0 - Number of times Quick Boomerang (Quickman) can be used
| $00 || Air
* $00A1 - Number of times Time Stopper (Flashman) can be used
|-
* $00A2 - Number of times Metal Blade (Metalman) can be used
| $01 || Ground
* $00A3 - Number of times Crash Bomb (Crashman) can be used
|-
* $00A4 - Number of times Item 1 can be used
| $02 || Ladder
* $00A5 - Number of times Item 2 can be used
|-
* $00A6 - Number of times Item 3 can be used
| $03 || Instadeath (Spikes, Lava)
* $00A7 - Number of Energy Tanks Remaining
|-
* $00A8 - Number of Lives remaining
| $04 || Water
* $00CB - Difficulty setting
|-
| $05 || Right Conveyer
|-
| $06 || Left Conveyer
|-
| $07 || Ice
|-
|}
|-
| $0033 || Tile type Mega Man is standing on (center)
|-
| $0034 || Tile type Mega Man is overlapping
|-
| $003D || Is Mega Man shooting? ||
|-
| $009A || Unlocked Weapons/Stages beaten ||
{|border="1" cellpadding="1"
|'''Bits''' || '''Hex''' || '''Weapon'''
|-
| <tt>0000 0001</tt> || $01 || Atomic Fire
|-
| <tt>0000 0010</tt> || $02 || Air Shooter
|-
| <tt>0000 0100</tt> || $04 || Leaf Shield
|-
| <tt>0000 1000</tt> || $08 || Bubble Lead
|-
| <tt>0001 0000</tt> || $10 || Quick Boomerang
|-
| <tt>0010 0000</tt> || $20 || Time Stopper
|-
| <tt>0100 0000</tt> || $40 || Metal Blade
|-
| <tt>1000 0000</tt> || $80 || Crash Bomb
|-
|}
|-
| $009B || Unlocked Items ||
{|border="1" cellpadding="1"
|'''Bits'''  || '''Hex''' || '''Item'''
|-
| <tt>0000 0001</tt> || $01 || Item 1 (Helicopter Platform)
|-
| <tt>0000 0010</tt> || $02 || Item 2 (Jet Sled)
|-
| <tt>0000 0100</tt> || $04 || Item 3 (Climbing Platform)
|-
|}
|-
| $009C || Atomic Fire Ammo ||
|-
| $009D || Air Shooter Ammo ||
|-
| $009E || Leaf Shield Ammo ||
|-
| $009F || Bubble Lead Ammo ||
|-
| $00A0 || Quick Boomerang Ammo ||
|-
| $00A1 || Time Stopper Ammo ||
|-
| $00A2 || Metal Blade Ammo ||
|-
| $00A3 || Crash Bomb Ammo ||
|-
| $00A4 || Item 1 Ammo ||
|-
| $00A5 || Item 2 Ammo ||
|-
| $00A6 || Item 3 Ammo ||
|-
| $00A7 || Number of Energy Tanks Remaining || Can go above $04, but will break passwords.
|-
| $00A8 || Number of Lives remaining || Looks glichy on the pause menu if greater than $64.
|-
| $0367-0369 || Mega Man's Color Palette ||
|-
|}
<!-- Ported from Mega Man II/RAM map-->
{| border="1" cellpadding="1"
|'''RAM'''  || '''Size (in bytes)''' || '''Description'''
|-
| $0F12 || 1 || Mega Man facing: $00: left, $01: right
|-
| $0F15 || 1 || Mega Man X coordinate
|-
| $0F16 || 1 || Mega Man Y coordinate
|-
| $0F39 || 1 || Frame counter for main gameplay (pauses during pause menu)
|-
|}
 
==Graphics==
{| border="1" cellpadding="1"
|'''RAM'''  || '''Function''' || '''Details'''
|-
| $0200-$2FF || Sprite memory || These values are constantly read and sent to OAM. [[#sprites|(2)]]
|-
| $0354 || Palette cycling pattern || Values seem level-dependent?
|-
| $0355 || Palette cycling speed || How many frames to wait before cycling the palette, $00 for no cycling. May glitch outside of levels.
|-
| $0356-$365 || Palette memory (background) ||
|-
| $0366-$375 || Palette memory (sprites) ||
|-
|}
 
==Password Screen==
{| border="1" cellpadding="1"
|'''RAM'''  || '''Function''' || '''Details'''
|-
| $0420 - $0438 || If 01, this grid space contains a dot. || Goes from left to right, top to bottom.
|-
| $0680  || Number of dots left on Password entering ||
|-
| $0680  || Position of cursor on Password entering ||
|}
 
==References==
#<div id="controller">[https://www.nesdev.org/wiki/Standard_controller#Report NESDev controller bits reference]</div>
#<div id="sprites">[https://www.nesdev.org/wiki/PPU_OAM#Byte_0 NESDev sprite format reference]</div>
 
<!-- These need more detailed research. Commenting out for now.


===Graphics Set Stuff===
===Graphics Set Stuff===
* $003A - A background-related boolean? (Changes to the rhythm of the flashing clouds of Airman's stage)
* $00F7 - Graphics Set
* $00F7 - Graphics Set
* $0200 - Y location of Heatman's left eye
 
* $0201 - Graphic for Heatman's left eye
===Title Screen===
* $0202 - Palette for Heatman's left eye
{| border="1" cellpadding="1"
* $0203 - X location of Heatman's left eye
|'''RAM'''  || '''Function''' || '''Details'''
* $0204 - Y location of Heatman's right eye
|-
* $0205 - Graphic for Heatman's right eye
| $04A2 || Windows' Y position ||
* $0206 - Palette for Heatman's right eye
|-
* $0207 - X location of Heatman's right eye
| $04A3 || Side of building's Y position ||
|-
| $04B0 || Mega Man's Y position ||
|-
|}


===Sprite stuff===
===Sprite stuff===
* $049F - Enemy 1's speed to the left
* $049F - Enemy 1's speed to the left
* $0460 - Mega Man's X location
* $04A0 - Mega Man's Y location
* $0033 - Is Mega Man on land
* $04A2 - Windows' Y position on Title Screen
* $04A3 - Side of building's Y position on Title Screen
* $04B0 - Mega Man's Y position on Title Screen
* $04BF - Enemy 1's Y location
* $04BF - Enemy 1's Y location


===Sound Stuff===
-->
* $0680 - Number of dots left on Password entering
* $06A0 - Position of cursor on Password entering
* $06C0 - Mega Man's HP


===Enemy HP===
{{Internal Data}}
* $06D9 - $06DF

Latest revision as of 20:54, 8 February 2024

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

General

RAM Function Details
$001B Camera state
$00 Default
$01 Changing the nametable (E.g. scrolling within an area, creating the pause menu)
$02 Freeze before and after scrolling to a new area
$80 Scrolling vertically
$001F Camera X position
$0020 Camera X screen When $001F gets larger than $FF, this value increases by $01.
$0022 Camera Y position
$0023 Controller 1 Poll (1)
$0025 Controller 1 Mirror (1)
$0027 Controller 1 Poll Only changes on first frame of state change. Crash Man checks this for jump code. (1)
$0030 Gravity
$004B Invincibility timer When above $00, invincibility frames will start and this will count down at a rate of $01 per frame.
$00CB Difficulty setting When an enemy takes damage, if this value is $00 (Normal) the damage given will be bitshifted left, doubling it.
$002A Stage select cursor position $00 is Dr. Wily, $01-$08 goes clockwise starting from Bubble Man.
$06C1 Boss HP

Sound

RAM Function Details
$0066 Sound effects strobe Write $01 to play the SFX ID in address $0580
$0067 Music strobe Write $01 to play the Music in address $0000
$0580 Sound effect queue

Player properties

RAM Function Details
$06C0 Mega Man's HP
$0460 Mega Man's X location
$04A0 Mega Man's Y location
$0036 Shooting pose timer
$0032 Tile type Mega Man is standing on (feet)
Value Type
$00 Air
$01 Ground
$02 Ladder
$03 Instadeath (Spikes, Lava)
$04 Water
$05 Right Conveyer
$06 Left Conveyer
$07 Ice
$0033 Tile type Mega Man is standing on (center)
$0034 Tile type Mega Man is overlapping
$003D Is Mega Man shooting?
$009A Unlocked Weapons/Stages beaten
Bits Hex Weapon
0000 0001 $01 Atomic Fire
0000 0010 $02 Air Shooter
0000 0100 $04 Leaf Shield
0000 1000 $08 Bubble Lead
0001 0000 $10 Quick Boomerang
0010 0000 $20 Time Stopper
0100 0000 $40 Metal Blade
1000 0000 $80 Crash Bomb
$009B Unlocked Items
Bits Hex Item
0000 0001 $01 Item 1 (Helicopter Platform)
0000 0010 $02 Item 2 (Jet Sled)
0000 0100 $04 Item 3 (Climbing Platform)
$009C Atomic Fire Ammo
$009D Air Shooter Ammo
$009E Leaf Shield Ammo
$009F Bubble Lead Ammo
$00A0 Quick Boomerang Ammo
$00A1 Time Stopper Ammo
$00A2 Metal Blade Ammo
$00A3 Crash Bomb Ammo
$00A4 Item 1 Ammo
$00A5 Item 2 Ammo
$00A6 Item 3 Ammo
$00A7 Number of Energy Tanks Remaining Can go above $04, but will break passwords.
$00A8 Number of Lives remaining Looks glichy on the pause menu if greater than $64.
$0367-0369 Mega Man's Color Palette
RAM Size (in bytes) Description
$0F12 1 Mega Man facing: $00: left, $01: right
$0F15 1 Mega Man X coordinate
$0F16 1 Mega Man Y coordinate
$0F39 1 Frame counter for main gameplay (pauses during pause menu)

Graphics

RAM Function Details
$0200-$2FF Sprite memory These values are constantly read and sent to OAM. (2)
$0354 Palette cycling pattern Values seem level-dependent?
$0355 Palette cycling speed How many frames to wait before cycling the palette, $00 for no cycling. May glitch outside of levels.
$0356-$365 Palette memory (background)
$0366-$375 Palette memory (sprites)

Password Screen

RAM Function Details
$0420 - $0438 If 01, this grid space contains a dot. Goes from left to right, top to bottom.
$0680 Number of dots left on Password entering
$0680 Position of cursor on Password entering

References


Internal Data for Mega Man 2
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