Initialised at routine A89D

Initialised at routine A89D.

Byte	Meaning
0x00	x-position (in pixels)
0x01	y-position (in pixels)
0x02 - 0x03	Address of the location into the room graphic buffer
0x04	x-delta (in pixels)
0x05	y-delta (in pixels)
0x06	Projectile status: $00 Destroyed - $01 Flying - $02 Impact 1 - $03 Impact 2
0x07 - 0x08	Precomputed offset to add to address pointer into room graphic buffer every frame
0x0B	Projectile type: $00-$01 basic laser , $02 laser, $03 multiple, $04 spray, $07 missile # Bit 7: subtype
0x0C	For $07: Missile trajectory index - For $02: Number of laser type $06 to create
0x0D	x-position for laser type $06
0x0E	Laser duration counter - Destroy laser at $00

Initialised at routine A628. Three bytes for every drone. 8 drones max. Byte $00 - x-position of drone Byte $01 - y-position of drone Byte $02 - index into the offset position table for the drone

Bytes	Meaning
0x00	X position
0x01	Y position
0x02	Bit 0: reverse sprite if set - Enemy direction $00 left $01 right
0x03	$00 FOOT MAN not jumping - $01 FOOT MAN jumping ; For Enemy type $FF (EXPLOSION) debris expansion counter
0x04 - 0x05	Address pointer to graphic data for static (non-animated) sprites - y-offset address pointer for FOOT MAN jumping - x-delta and y-delta for MINE and BLOB} { 0x06	FOOT MAN Falling speed? $00 Not falling - $02 - $04
0x07	$00 Not used
0x08	$00 Not used
0x09	Bit 7: 1 - graphic data for fixed (non animated) sprite. Computed by: address at 0x04-0x05
	0 - graphic data from animated sprite. Computed by: base graphic data address at 0x0A-0x0B + offset of animation from base address at 0x16-0x17
	Bit 6-0: enemy type -> $00 FOOT MAN , $FF Explosion, $FE Bubble, $FD Smartbomb, $FC Question
0x0A - 0x0B	Address pointer to animation offset table
0x0C	Enemy status $00 dead / $01 alive
0x0D	Explosion counter (decrement))
0x0E	Width of the sprite (in bytes)
0x0F	Height of the sprite (in pixels)
0x10	Enemy speed velocity ($00 stopped). For Bubble: bubble y-position counter offset
0x11	Enemy type:
	0x00 (FOOTMAN) - Counter for state change duration: $C8 fixed crouched
	0x08 (SCANNER) - SCANNER movement direction - $00 horizontal (direction based on byte 0x02) - $01 moving down - $02 moving up - $03 bump/fire
	0x10 (BOSS) - Boos direction $00 Up - $01 Down
	0x0B - 0x0A (LAUNCHER/SHOOTER) - Counter desc . From shot frequency to 0. Shots when counter equals zero
	0x0C - 0x0D (POD/MINE LAYER) - Move direction ($00 up )
	0x09 (SWING GUN) - Gun orientation if fixed (0 - left, 1 - left bottom, 2 - bottom, 3 - right bottom, 4 - right)
	0x0E-0x0F (BLOB/MINE) State change counter
	0xFE (BUBBLE) Bubble duration counter
0x12	Enemy type:
	0x00 (FOOTMAN): $00 walking - $01 crouched - $02 stand-by
	0x08 (SCANNER): state change counter
	0x10 (BOOS): Boss speed $02 healed $01 wounded
	0x0B - 0x0A (LAUNCHER/SHOTTER) - Shot frequency
	0x0C - 0x0D (POD/MINE LAYER) - speed
	0x09 (SWING GUN) - $00 mobile - $01 fixed
	0x0E (MINE) - Mine state $00 Continue with same x/y-delta $01 Change x/y-delta to chase Rex
	0xFE (BUBBLE) - MSB of address graphic data
0x13	0xFE (BUBBLE) LSB of address graphic data
	0x10 (BOSS) Boss status $00 Good health $01 Wounded $02 Escape pod
0x14	Enemy health
0x15	Energy bubble $01 big / $00 small / $FF no bubble
0x16 - 0x17	Address pointer to graphic data for animated sprites

Three bytes for every atom. $00 y-delta $01 x-offset $02 y-position

Variable used to prevent multiple shots while FIRE key is hold down. FIRE key hold down is only available when rapid shots bonus is active

0-Basic Laser, 1-Double fire, 2-Laser, 3-Multiple, 4-Spray. Used to compute BOSS health

$00 or $01 select distints graphic data

Values from 0 to 120

$00 No / $FF Yes

$00 No / $FF Yes

$00 No / $FF Yes

$00 Not destroy all - $01 Destroy all. Value $00 on init

Used in routine B258

Used in routine B258

From 9 to 0

Real score = score * 100

$00 inactive - $01 active

$FF inactive. Otherwise the value is the index into the table for flash commands at 9AB3

$00 train not generating $01 Generating train

$00 not active $01 active

Variable used to prevent activate and inactivate of shield if DOWN key is hold down

Shield decrement when counter reaches zero

$00: Not available / $01: Available. Available on init

$00: Not available / $01: Available. Not available on init

$00: Not available / $01: Available. Not available on init

$00: Not available / $01: Available. Not available on init

$00: Not available / $01: Available. Not available on init

$00 Rex alive $01 Rex dead

$00 room not configured $01 room configured

$00 invisible $01 visible

$00 not atom flushing $01 atoms flushing

$00 not teleporting $01 teleporting

$00 teleporting on game begin $01 teleporting after dead

$04 on init

Initialised with value $32 for title screen main loop Initialised with value $05 for time bar: number of zig-zag to remove a timer slot

$00 right $01 left

Timer bar: 12 slots of time

Used as well for index into laser template graphic table at B943

3 smartbombs on init

Every time that energy quantity in A018

(0-speed up 1-shield loss 2-1000 bonus 3-energy loss 4-100 rapid shots)

$00 inmortal $01 mortal

$00 normal speed - $01 fast speed

Every 100 points increment a lives. Reset on every live awarded

$01 enemy fired weapon / $00 Rex fired weapon

Value $00 on init

Used in routines E00B an E04F

Initialised with value of $E05B on init, although the base address of the table is $E067. Every animation definition spans $0C bytes and in the first the value $0C is added to the initial address. Used in routine 947A

Hidden on init. $00 Hidden / $01 Visible

Value DC26 on init so initially this points to the FOOT MAN windows.

Value copied from Room connections and enemy configuration pointer at B133

Value copied from Room connections and enemy configuration pointer at B133

Value copied from Room connections and enemy configuration pointer at B133

Value copied from Room connections and enemy configuration pointer at B133

Value copied from the corresponding Enemy room configuration at AECD

Used as: length of the current processing line for windows setup, color attribute for windows border, color attribute for text content of the windows, ... Used in routine A13E. As x-position of the tile at routine C745. As stack pointer at routine B205 and A28A. As destructible tile type and laser x-position at routine B645. As position into offset table for debris expansion at routine BF66

Used as: max length of the lines processed for windows setup, number of columns of the windows, horizontal position of the windows, ... Used in routine A13E. As tile number in C745. As stack pointer at routine R$B33E. As address into mapping table of tile graphics/room graphics and laser y-position at routine B645

Vertical position of the windows Used in routine A13E. As tile color attribute and laser direction at B645

Used as increment for laser y-position at routine B645

Value $0313 on init. Used at routines A375 and A388.

Value $11 on init

Is used to configure the routines at A46A to check for key presses of the defined keys

$FF Kempston | $00 Cursor, Sinclair or Defined keys. $00 on init. Not used in game

As x-pixel-position of entity in routine B258. As x-byte-position of debris in routine BF66

As y-pixel-position of entity in routine B258. As y-pixel-position of debris in routine BF66

Used in routine B258

Value $00 on init

$00 not falling / otherwise falling speed ($02 or $04)

The list of rooms are stored into table at A90C. Value $00 on init

Value $C8 on init. Equals to 200 loops to run.

Used in routine A1DB

Bytes	Meaning
0x00-0x01	Address pointer to sprite graphics data
0x02	Horitzontal position of sprite
0x03	Vertical position of sprite. Always $00
0x04	Width of sprite (in bytes). Always $02
0x05	Height of sprite (in pixels). Always $10

Used in routine A212

Bytes	Meaning
0x00-0x01	Address pointer to sprite graphics data
0x02	Horitzontal position of sprite
0x03	Vertical position of sprite. Always $00
0x04	Width of sprite (in bytes). Always $02
0x05	Height of sprite (in pixels). Always $10

Byte	Meaning
$00	number of tones
$01	variation counter
$02 - $03	Address pointer to sound data
$04	fine pitch / noise pitch
$05	coarse pitch
$06	Noise/tone 0 - Tone 1 - Noise
$07	Volume (bits 7-4 )

Contains two words for every tile drawn on screen. First word: address of the tile location into the room graphics buffer Second word: address of the tile graphics $FF is an end marker Tiles $00, $10, $71, $81 and $91 are special tiles, not drawn The routine C745 fill this table and the data overwrites the main loop routine for the title screen (DAC0) and subsequent routines

Bytes	Control
$00	Up
$01	Down
$02	Left
$03	Right
$04	Fire

Data copied from the corresponding animation definition at E067

Bytes	Meaning
0x00-0x01	Address pointer to sprite graphics data
0x02	Horitzontal position of sprite. Always $03
0x03	Vertical position of sprite. Always $10
0x04	Width of sprite (in bytes)
0x05	Height of sprite (in pixels)