Mega Man (NES)/RAM map

The following article is a RAM map for Mega Man (NES).

Player Variables

Input

RAM	Function	Details
0x0014	Controller 1 buttons held
0x0015	Controller 2 buttons held
0x0016	Controller 1 buttons held	(clone of 0x0014?)
0x0017	Controller 2 buttons held	(clone of 0x0015?)
0x0018	Controller 1 buttons tapped
0x0019	Controller 2 buttons tapped

Camera & Position

RAM	Function	Details
0x001A	Camera X position
0x001B	Camera X screen	Increases by $01 when 0x001A > $FF(255)
0x001C	Camera state	$00 Default $01 Changing the nametable (scrolling, pause menu, blinking stage select,…) $02 Freeze before and after scrolling to a new area $40 Scrolling to a new area
0x001E	Camera Y position
0x0020	Mega Man's X screen	Increases by $01 when 0x0022 > $FF(255)
0x0021-22	Mega Man's X position	0x0021=sub-pixel, 0x0022=pixel
0x0024-25	Mega Man's Y position	0x0024=sub-pixel, 0x0025=pixel

Life & Health

RAM	Function	Details
0x006A	Mega Man Life Bar Value	$1C(28)-Full, $00-Empty
0x0055	Mega Man's I-frame Counter	Counts down from $6F(111) $01/frame after taking damage
0x00A6	Lives	Max $80(128); bit 7 = Game Over; game will not raise past $63(99)

Score

RAM	Function	Details
0x0072-78	Score	Each byte represents one digit in BCD. Starts with ones digit (0x0072)
0x00AE	Bonus	Number of energy balls collected ×1000 at level end

Weapons & Abilities

Weapon Energy

RAM	Function	Details
0x006B	Cut Man Weapon Energy	$1C(28)-Full, $00-Empty
0x006C	Ice Man Weapon Energy	$1C(28)-Full, $00-Empty
0x006D	Bomb Man Weapon Energy	$1C(28)-Full, $00-Empty
0x006E	Fire Man Weapon Energy	$1C(28)-Full, $00-Empty
0x006F	Elec Man Weapon Energy	$1C(28)-Full, $00-Empty
0x0070	Guts Man Weapon Energy	$1C(28)-Full, $00-Empty
0x0071	Magnet Beam Weapon Energy	$1C(28)-Full, $00-Empty

Weapon Select

RAM	Function	Details
0x005F	Weapon Select (pause only)	$00 Mega Buster $01 Hyper Bomb $02 Thunder Beam $03 Super Arm $04 Ice Slasher $05 Rolling Cutter $06 Fire Storm $07 Magnet Beam
0x0060	Are Mega Man's bullets on-screen	$C0(192)=yes, $00=no

Miscellaneous

RAM	Function	Details
0x0023	Timer	Increases $01/frame; pauses don’t affect menu display
0x002C	Type of object Mega Man is touching from the top	$00-Air, $01-Solid, $02-Ladder, $03-Spike, $04-Ice, $05-Water
0x0094	Type of object Mega Man is touching from the sides	$00-Air, $01-Solid, $02-Ladder, $03-Spike, $04-Ice, $05-Water
0x0031	Stage ID	$00-Cut Man … $0B(11)-Ending BG
0x0100-FF	Stack	RAM used by CPU stack
0x0200-FF	Sprite Data	256 bytes transferred via DMA to PPU during NMI
0x03D0-DF	Palette Data	Background palette, 16 bytes
0x0440	Mega Man's Blink Timer	Counts $01/frame pseudo base 9; eyes close at $A2 for 9 frames
0x0500-7F	Sound Values	Pulse1, Pulse2, Triangle, Noise channels $00 Note ID $01 Music Pattern? $02-03 Countdown for note end (frame quarters) $06 Vibrato Speed $0A Note Pitch ID $0E Frames since note started $14 Vibrato bend direction $1D Frames since note/silence started
0x06C1	Boss Energy	$1C(28)-Full, $00-Empty