Memory offsets: NES (North American)
From Bionic Commando Database
Memory Locations
Main Break down
0000-0FFF - Variable Memory
0000-07FF - Usable Memory
0800-0FFF - An exact copy of 0000-07FF.
1000-1FFF - An exact copy of 0000-0FFF.
2000-3FFF - Constant data, changes when a room loads.
4000-5FFF - Unknown. Keeps accumulating.
6000-7FFF - Empty memory
8000-FFFF - Program Memory
Memory - Description
0001 -
0004 -
0005 -
0006 -
000A - Accumulator Register
000C -
000F - Gets set to 0A when an action is performed
0019 - The column of the highlighting box at equipment screen
001A - The row of the highlighting box at equipment screen
001D - Flag for which direction ego is facing (00 - left, 01 - right)
0033 -
0036 -
0039 -
003B -
003C -
0040 -
0041 -
0042 -
0043 -
0044 -
0045 -
0046 -
0047 -
0048 -
0049 -
004A - Player Lives
004B -
004C -
004E -
004F -
0050 -
0051 -
0052 -
0053 -
0054-0055 - The location as the title logo is drawn on the screen
0055 -
0056 -
0057 - The game over screen timeout
0058 -
0059 -
005A -
005B -
005C -
005E -
005F - Changes with ego position or enemy position if one if on the screen (probably a temp variable)
0060 -
0061 - Ego X position on screen
0062 - Ego Y position on screen
0063 -
0064 -
0065 -
0066 -
0067 -
0068 -
0069 -
006A-006B - Delay after title screen finishes drawing to start intro or demo.
006B -
006C -
006E -
006F -
0070 -
0071 -
0072 -
0073 -
0074 -
0075 -
0076 -
0077 -
0078 -
0079 -
007A -
007B -
007C -
007E -
007F -
0080 - The cursor toggle (0-Comm / 1-Wire, 0-Desc / 1-Tran)
0081 -
0082 - Flag during intro story. 08 - Clear text. 09 - Writing text. 0A - Waiting after text. 0B - Fade out.
0083 -
0084 -
0085 - Toggles from 1 to 0 as text is being written to the screen during intro
0086 -
0087-0088 - Delay counters for writing text and clearing text during intro story
00C0-00EF - Loaded palette colors.
A Button
| B Button
| | Start
| | | Select
| | | | Up
| | | | | Down
| | | | | | Left
| | | | | | | Right
| | | | | | | |
0:0:0:0:0:0:0:0
00F8 - Controller Press (0 - Idle, 1 - Right, 2 - left, 4 - Down, 8 - Up, 10 - Start, 20 - Select, 40 - B, 80 - A)
00FA - Controller Down (0 - Idle, 1 - Right, 2 - left, 4 - Down, 8 - Up, 10 - Start, 20 - Select, 40 - B, 80 - A)
0106 - Destination area part 1 in map mode
0107 - Destination area part 2 in map mode
0150-01F0 - Sound data being processed
01FC-01FF - Stack
H Mirror
| V Mirror
| | Priority
| | | ??? Palette
0:0:0:000 00 ------- Effects Byte
00 - Object Y Position
01 - Object #
02 - Object Flags
03 - Object X Position
0200-02FF - Objects on screen (Note, changing these objects only works for one cycle before they're reset)
0300-03FF - Screen background tiles and palette?
0400-043F - PPU Memory used to animate the background. (Enemy doors, text, fire, etc.)
Power Techincal Requirements
8 - Must beat areas 1-6 and have gamma communicator
10 - Must beat area 7 and have delta communicator
12 - ?
+--+ +--+
|10|=====|12|
+--+ +--+ +--+ +--+ +--+ +--+
|13| |04|==|15| |07| || \\ ||
+--+ +--+ +--+ +--+ || \\ ||
|| // \\ || || \\ || \\ ||
+--+ +--+ +--+ +--+ +--+ +--+
|01| |16|==|05| |18| |08| |11|
+--+ +--+ +--+ +--+ +--+ +--+
|| || // || // || \\
|| +--+ || // +--+ +--+
|| |02| || // |09| |19|
|| +--+ || // +--+ +--+
|| || || // ||
+--+ +--+ +--+ +--+ +--+
|00| |03|==|06|==|14| |17|
+--+ +--+ +--+ +--+ +--+
Truck and Helicopter X,Y position for each area
Area X, Y
00 - 28, 98
01 - 28, 58
02 - 48, 78
03 - 48, 98
04 - 48, 38
05 - 68, 58
06 - 68, 98
07 - 88, 38
08 - A8, 58
09 - A8, 78
10 - A8, 28
11 - D8, 58
12 - D8, 28
13 - 28, 38
14 - 88, 98
15 - 68, 38
16 - 48, 58
17 - A8, 98
18 - 88, 58
19 - C8, 78
Truck Patterns (beginning with their initial position)
Truck 1 - 4,5,15,4,1,4...
Truck 2 - 3,6,5,2,16,5,6,3...
Truck 3 - 7,8,10,8,19,8,6,8,7...
Truck 4 - 8,19,8,7,18,7,8...
Truck 5 - 10,12,11,10...
0440 - Map Helicopter - Process Flag (00 - Ignore, 01 - Active, +80 - Hidden)
0441 - Map Truck 1 - Process Flag
0442 - Map Truck 2 - Process Flag
0443 - Map Truck 3 - Process Flag
0444 - Map Truck 4 - Process Flag
0445 - Map Truck 5 - Process Flag
0446 -
0447 -
0448 -
0449 - Map Helicopter Frame
044A - Map Truck 1 - Pattern (01) The patterns predict how the trucks turn when they reach each area.
044B - Map Truck 2 - Pattern (03)
044C - Map Truck 3 - Pattern (04)
044D - Map Truck 4 - Pattern (05)
044E - Map Truck 5 - Pattern (07)
044F -
0450 - Cover up object for secret passage between areas 15 and 18
0451 - Cover up object for secret passage between areas 14 and 17
0452 - Map Helicopter - X
0453 - Map Truck 1 - X
0454 - Map Truck 2 - X
0455 - Map Truck 3 - X
0456 - Map Truck 4 - X
0457 - Map Truck 5 - X
0558 -
0459 -
045A -
045B -
045C - Map Truck 1 - Unknown Counter
045D - Map Truck 2 - Unknown Counter
045E - Map Truck 3 - Unknown Counter
045F - Map Truck 4 - Unknown Counter
0460 - Map Truck 5 - Unknown Counter
0461 -
0462 -
0463 -
0464 - Map Helicopter - Y
0465 - Map Truck 1 - Y
0466 - Map Truck 2 - Y
0467 - Map Truck 3 - Y
0468 - Map Truck 4 - Y
0469 - Map Truck 5 - Y
046A -
046B -
046C -
046D - Map Helicopter Propellor toggle (00 - Spin 1, C0 - Spin 2)
046E - Map Truck 1 - Unknown Counter
046F - Map Truck 2 - Unknown Counter
0470 - Map Truck 3 - Unknown Counter
0471 - Map Truck 4 - Unknown Counter
0472 - Map Truck 5 - Unknown Counter
0473 -
0474 -
0475 -
0476 - Map Helicopter - Graphic offset
0477 - Map Truck 1 - Graphic offset
0478 - Map Truck 2 - Graphic offset
0479 - Map Truck 3 - Graphic offset
047A - Map Truck 4 - Graphic offset
047B - Map Truck 5 - Graphic offset
047C -
047D -
047E -
047F - Map Helicopter - Direction (0 - Right, 1 - Down+Right, 2 - Down, 3 - Down+Left, 4 - Left, 5-Up+Left, 6 - Up, 7 - Up+Right)
0480 - Map Truck 1 - Direction
0481 - Map Truck 2 - Direction
0482 - Map Truck 3 - Direction
0483 - Map Truck 4 - Direction
0484 - Map Truck 5 - Direction
0485 -
0486 -
0487 -
0488 - Map Loop (0 - Reset, 1 - Idle, 2 - Moving)
0489 - Map Truck 1 - Status for next direction (1 - Idle, 2 - Switch to next direction)
048A - Map Truck 2 - Status for next direction
048B - Map Truck 3 - Status for next direction
048C - Map Truck 4 - Status for next direction
048D - Map Truck 5 - Status for next direction
048E -
048F -
0490 -
0491 - Map Status (00 - Decend Screen, 01 - Please Instruct Us / Moving, 02 - Decend/Transfer, 03 - Choose Destination)
0492 -
0493 -
0494 -
0495 -
0496 -
0497 -
0498 -
0499 -
049A - Map Helicopter Transfer index (2, 4, 6, 8, A) - Also countdown after collision with truck.
049B -
049C -
049D -
049E -
049F -
04A0 -
04A1 -
04A2 -
04A3 - The number of the truck that you last hit (1-5 trucks, 7 - Passage 18-15 8 - Passage 14-17)
04A4 - Map Truck 1 - Hidden Timeout (Set to FF when you defeat a truck. When it becomes 0, truck flag is ANDed with 80)
04A5 - Map Truck 2 - Hidden Timeout
04A6 - Map Truck 3 - Hidden Timeout
04A7 - Map Truck 4 - Hidden Timeout
04A8 - Map Truck 5 - Hidden Timeout
04A9 -
04AA -
04AB -
04AC -
04AD - Map Truck 1 - Next index direction
04AE - Map Truck 2 - Next index direction
04AF - Map Truck 3 - Next index direction
04B0 - Map Truck 4 - Next index direction
04B1 - Map Truck 5 - Next index direction
04B2 -
04B3 -
04B4 -
04B5 - Map Helicopter - Area
04B6 - Map Truck 1 - Area
04B7 - Map Truck 2 - Area
04B8 - Map Truck 3 - Area
04B9 - Map Truck 4 - Area
04BA - Map Truck 5 - Area
04BB -
04BC -
04BD -
04BE - The number of the door that you last exited. Used for where to return you when you die.
04BF - Door locked flag (only gets checked when an area is initilized) Only one door can be locked per map.
04C0 -
04C1 - Flare used flag
04C2 - Medicine used flag
04C3 -
04C4 -
04C5 -
04C6 -
04C7 -
04C8 -
04C9 -
04CA - Selected Gun (0 - Rifle, 1 - Launcher, 2 - Wide, 3 - Machine, 4 - 3 Way)
04CB - Rifle Flag
04CC - Rocket Launcher Flag
04CD - Wide Cannon Flag
04CE - Machinegun Flag
04CF - 3-Way Flag
04D0 - Unused Gun Flag
04D1 - Selected Armor (0 - Pendant, 1 - Helmet, 2 - BPV)
04D2 - Pendant Flag
04D3 - Helmet Flag
04D4 - Bulletproof Vest Flag
04D5 - Unused Armor Flag 1
04D6 - Unused Armor Flag 2
04D7 - Unused Armor Flag 3
04D8 - Selected Item (0 - Flares, 1 - Medicine, etc.)
04D9 - Flare Bomb Flag
04DA - Medicine Flag
04DB - Permit Flag
04DC - Steel Boots Flag
04DD - Rapid Fire Device Flag
04DE - Unused Item Flag
04DF - Selected Communicator (0 - Alpha, 1 - Beta, 2 - Gamma, 3 - Delta)
04E0 - Alpha Communicator Flag
04E1 - Beta Communicator Flag
04E2 - Gamma Communicator Flag
04E3 - Delta Communicator Flag
04E4 - Unused Communicator Flag 1
04E5 - Unused Communicator Flag 2
04E6 - The highlighted position in the item selection screen
04E7 - Bullet Canisters Collected Place holder 3
04E8 - Bullet Canisters Collected Place holder 2
04E9 - Bullet Canisters Collected Place holder 1 (Moves when >9)
04EA - Player Hit Points
04EB - Beat Area 1 Flag
04EC - Beat Area 2 Flag
04ED - Beat Area 3 Flag
04EE - Beat Area 4 Flag
04EF - Beat Area 5 Flag
04F0 - Beat Area 6 Flag
04F1 - Beat Area 7 Flag
04F2 - Beat Area 8 Flag
04F3 - Beat Area 9 Flag
04F4 - Beat Area 10 Flag
04F5 - Beat Area 11 Flag
04F6 -
04F7 - Underground passage's found flag
04F8 -
04F9 -
04FA - Eagle Badges
04FB -
04FC -
04FD -
04FE -
04FF -
0537 - Bullet 1 is active flag
0538 - Bullet 2 is active flag
0539 - Bullet 3 is active flag
053A - POW is active flag
053B - Arm Flag (0 - None, 1 - Out, 80 - ?)
053C - Enemy Bullet 1 Active Flag
053D - Enemy Bullet 2 Active Flag
053E - Enemy 1 Active Flag (Main System Bullet counts as enemy)
053F - Enemy 2 Active Flag
0540 - Enemy 3 Active Flag
0541 - Object 1 Active Flag
0542 - Object 2 Active Flag
0543 - Object 3 Active Flag
0544 - Object 4 Active Flag
0545 - Object 5 Active Flag
0546 - Object 6 Active Flag
0547 - Object 7 Active Flag
0548 - Object 8 Active Flag
0549 -
054A -
054B -
054C -
054D -
054E -
054F -
055C -
055D - Ego Bullet 1 flag. (00 - Moving or hit wall, 01 - Off Screen right, FF - Off screen left)
055E - Ego Bullet 2 flag. (00 - Moving or hit wall, 01 - Off Screen right, FF - Off screen left)
055F - Ego Bullet 3 flag. (00 - Moving or hit wall, 01 - Off Screen right, FF - Off screen left)
0560 -
0561 -
0562 - Enemy bullet 1 flag (00 - Moving or hit wall, 01 - Off Screen right, FF - Off screen left)
0563 - Enemy bullet 2 flag (00 - Moving or hit wall, 01 - Off Screen right, FF - Off screen left)
0564 - Enemy 1 flag opposite?
0565 - Enemy 2 flag opposite?
0566 - Enemy 3 flag opposite?
0567 - Object 1 X Screen offset (How many screens away this object is from ego)
0568 - Object 2 X Screen offset (How many screens away this object is from ego)
0569 - Object 3 X Screen offset (How many screens away this object is from ego)
056A - Object 4 X Screen offset (How many screens away this object is from ego)
056B - Object 5 X Screen offset (How many screens away this object is from ego)
056C - Object 6 X Screen offset (How many screens away this object is from ego)
056D - Object 7 X Screen offset (How many screens away this object is from ego)
056E - Object 8 X Screen offset (How many screens away this object is from ego)
056F - Ego X position
0570 - Bullet 1 X position
0571 - Bullet 2 X position
0572 - Bullet 3 X position
0573 - POW X Position
0574 - Arm X position
0575 - Enemy Bullet 1 X position
0576 - Enemy Bullet 2 X position
0577 - Enemy 1 X Position (Main system bullet counts as enemy)
0578 - Enemy 2 X position
0579 - Enemy 3 X position
057A - Object 1 X position
057B - Object 2 X position
057C - Object 3 X position
057D - Object 4 X position
057E - Object 5 X position
057F - Object 6 X position
0580 - Object 7 X position
0581 - Object 8 X position
0582 - Highlighting box X position in prep screen.
0583 - Increments by 20 when ego attempts to alter X position.
0584 -
0585 -
0586 -
0587 -
0588 -
0589 -
058A -
058B - Increments by 20 when enemy attempts to alter X position.
058C - Increments by 20 when enemy attempts to alter X position.
058D - Increments by 20 when enemy attempts to alter X position.
058F - Enemy Cycle by 20
05A0 -
05A1 - Object 1 Y Screen offset (How many screens away this object is from ego)
05A2 - Object 2 Y Screen offset (How many screens away this object is from ego)
05A3 - Object 3 Y Screen offset (How many screens away this object is from ego)
05A4 - Object 4 Y Screen offset (How many screens away this object is from ego)
05A5 - Object 5 Y Screen offset (How many screens away this object is from ego)
05A6 - Object 6 Y Screen offset (How many screens away this object is from ego)
05A7 - Object 7 Y Screen offset (How many screens away this object is from ego)
05A8 - Object 8 Y Screen offset (How many screens away this object is from ego)
05A9 - Ego Y position
05AA - Bullet 1 Y Position
05AB - Bullet 2 Y Position
05AC - Bullet 3 Y Position
05AD - POW Y Position
05AE - Arm Y Position
05AF - Enemy Bullet 1 Y position
05B0 - Enemy Bullet 2 Y position
05B1 - Enemy 1 Y Position (Main system bullet counts as enemy)
05B2 - Enemy 2 Y Position
05B3 - Enemy 3 Y Position
05B4 - Object 1 Y position
05B5 - Object 2 Y position
05B6 - Object 3 Y position
05B7 - Object 4 Y position
05B8 - Object 5 Y position
05B9 - Object 6 Y position
05BA - Object 7 Y position
05BB - Object 8 Y position
05BC - Highlighting box Y position in prep screen.
05BD - Increments by 20 when ego attemptx to alter Y position.
05BE -
05BF -
05C0 -
05C1 -
05C2 -
05C3 -
05C4 -
05C5 - Increments by 20 when enemy attempts to alter X position.
05C6 - Increments by 20 when enemy attempts to alter X position.
05C7 - Increments by 20 when enemy attempts to alter X position.
05D0 - Ego Frame (26 - Idle, 4B - Walking, 71 - Duck/Arm Angle, FD - Arm Up,
05DA - Enemy 1 state
05DB - Enemy 1 Graphic pointer
05DD - Enemy 1 Frame
05DE - Main System Explosion Frame
05DF - Enemy 2 state
05E0 - Enemy 3 state
05E9 - Ego Swing Frame
05EF - Enemy 1 Graphic pointer 2
05F8 - Ego Frame (00 - Idle, 48 - connected up, 60 - connected angle 2A, 5?, 8? - Walking)
0604 - Enemy Animation Frame
060A - Ego State (0 - Idle, 1 - Walking, 2 - Ducking, 3 - Arm attached Directly Up, 4 - Arm attached angle, 5 - Falling, 6 - Parachuting, 8 - Arm attached duck/walk, A - Injured, 10 - Dead, 11 - Passing through a door)
060C - Ego Frame number (2-6 walking, A - Idle, 1 - duck, more)
0611 - Arm swinging
0620 - Flag for direction Ego is facing (0 - Right, 1 - Left)
0625 - Ego position on swing and swing failure values (1-7)
062C - Flag for direction Enemy 1 is facing
0633 - Flag for direction Ego is facing (0 - Right, 1 - Left)
0634 - Flag for direction bullet 1 is moving (0 - Right, 1 - Left)
0635 - Flag for direction bullet 1 is moving (0 - Right, 1 - Left)
0636 - Flag for direction bullet 1 is moving (0 - Right, 1 - Left)
063E - Flag for direction Enemy 1 is facing
0642 - Outside neutral zone flag
0648 - Bullet 1 active Flag (Flare counts as a bullet)
0649 - Bullet 1 active Flag
064A - Bullet 1 active Flag
064B - POW active flag
064C - Arm State (0 - none, 1 - out, 2 - connected)
0647 - Enemy 1 X position
0652 - Darkness status (0 - Light, 1 - Pitch Black, 2 - Eyes Adjusted)
0654 - Gets set from 1 to 0 when you pickup the delta comm
065A - Ego State (00 - idle, 01 - Walking, 02 - Ducking, 03 - Arm attached Directly Up, 04 - Arm attached angle, 05 - Falling at an angle, 07 - Falling stright down, 0A - Recoiling from damage, 10 - Dead)
0665 - Enemy 1 State (0 - Idle, Walking, 2/3 - Jumping down, etc.) Changes per enemy
0666 - Enemy 2 State (0 - Idle, Walking, 2/3 - Jumping down, etc.)
0680 - Delay from death to reset.
0681 - Bullet 1 duration
0682 - Bullet 1 duration
0683 - Bullet 1 duration
0684 - POW duration x256
068B - The timeout for resetting the palette to semi dark in area 4.
0697 - POW duration x1
069E - Effect darkness timeouts
06A7 - Bullet 1 state (0 - none, 2 - Hit something/Timed Out, 8 - remove, A - in flight) Add 10 if bullet is a 2x2 sprite like rocket launcher or 3-way.
06A8 - Bullet 1 state (0 - none, 2 - Hit something/Timed Out, 8 - remove, A - in flight) Add 10 if bullet is a 2x2 sprite like rocket launcher or 3-way.
06A9 - Bullet 1 state (0 - none, 2 - Hit something/Timed Out, 8 - remove, A - in flight) Add 10 if bullet is a 2x2 sprite like rocket launcher or 3-way.
06AA -
06AB - Flag for arm attached (00 - not attached, F7 - attached)
06AC - Enemy Bullet 1 effects
06AD - Enemy Bullet 2 effects
06AE - Object 1 effects (Add 10 for shimmering, 20 for behind background, 40 for flashing)
06AF - Object 2 effects
06B0 - Object 3 effects
06B1 - Object 4 effects
06B2 - Object 5 effects
06B3 - Object 6 effects
06B4 - Object 7 effects
06B5 - Object 8 effects
06BA - Effects ego colissions
06BF - Arm distance from ego
06D2 - Arm throw state (3 - Up, 6 - Up angle, 4 - Stright, 5 - Ducking)
06D7 - Slow accumulator
0700 -
0711 - Object 1 bouncing flag
0712 - Object 2 bouncing flag
0713 - Object 3 bouncing flag
0714 - Object 4 bouncing flag
0719 - Ego Y velocity
0724 - Object 1 Y velocity
0725 - Object 2 Y velocity
072C - Increments by 10 as ego flies through the air.
0737 - Object 1 counter
0738 - Object 2 counter
0739 - Object 3 counter
073A - Object 4 counter
073F - Unknown Ego status (00 - Init, Move - A0, 20 - Falling)
074A - Enemy jumping status (BD - Normal, 28 - Jumping)
075D - Object 1 incrementer (for soldiers it counts down from 8. When 0 is reached, xthey jump)
075E - Object 2 incrementer (Bullet canisters count up by 10 each time they bounce)
075F - Object 3 incrementer
0760 - Object 4 incrementer
0779 - Ego hit points
077A - Ego bullet's damage value 1
077B - Ego bullet's damage value 2
077C - Ego bullet's damage value 3
077D -
077E -
077F -
0780 -
0781 -
0782 -
0783 - Enemy 1 HP When killed = FF until bullet goes away. Includes bosses and main systems.
0784 - Enemy 2 HP
0785 - Enemy 3 HP
0786 - Enemy 4 HP
0787 - Enemy 5 HP
0788 - Enemy 6 HP
0789 - Enemy 7 HP
078A - Enemy 8 HP
078B - Enemy 9 HP
078C - Enemy 10 HP
0791 - Arm value of some sort
0796 - Enemy invincibility time
07AA - Bullet canister 1 timeout and hop count
07AB - Bullet canister 2 timeout and hop count
07AC - Bullet canister 3 timeout and hop count
07E3 - Flag for ego falling (0 - falling, 1 - on ground or arm attached)
07E6 - Ego State (0 - Not on screen, 1 - Walking, 2 - Ducking, 3 - Arm Up, 4 - Arm walking, 5 - Arm ducking, 6 - Arm Angle, 9 - Climbing, A - Parachuting, B - Falling, C,D,E - Swinging, 10 - Idle, 11 - Injured, 12 - Dead)
07E7 - Same as above.
07EB - Hyper Bazooka flag
Subroutines
9749 -
B9AD -
C000 - Beginning of code
D6A0 -
D6C7 - Load the graphic from register Y and A
D6CD -
D6EB -
D6F1 -
D754 - Play sound from register Y
D75D -
D760 -
D778 - Gets called at game init
D79C -
D7BA -
D7BD - Gets called at game init
EA8F -
F04F -
FEE2 matches ROM location 3FEF2 (start of truck movement values)
FFFA - Non-Maskable Interrupt (NMI) Address (2 bytes)
FFFC - Reset Vector (2 bytes)
FFFE - IRQ/BRK Vector (2 bytes)
