Memory map

Page	Byte	Address	Description
64	0	4000	Loading screen
91	0	5B00	Unused
91	96	5B60	Rex projectile configuration
93	34	5D22	Enemy projectiles configuration for the current room
94	78	5E4E	Drones configuration for multiple weapon
94	102	5E66	Data buffer for the state of every enemy on screen
95	230	5FE6	Stack (SP = $6190 at init game )
97	144	6190	Unused
99	6	6306	Charset and ui graphics
101	6	6506	Tile collision behaviour
102	6	6606	Tiles graphic data
110	6	6E06	Tiles attributes
111	6	6F06	Supertiles layout
120	6	7806	Room layout
127	34	7F22	Unused - Remnant Room Layout from Rex (Side A)
129	152	8198	Graphics data for player, enemies, hud and room objects
146	64	9240	Unused
148	112	9470	The game has just loaded
150	99	9663	Routine not used
150	103	9667	Active/inactive shield
150	131	9683	Draw Rex and shield
151	49	9731	Destroy all enemy projectiles
151	57	9739	Release a smartbomb
151	110	976E	Destroy an enemy if smartbomb released or Rex dead
151	171	97AB	Reset sound buffer, volume channels and check for FIRE key
151	210	97D2	Reset sound data and wait for FIRE key press
151	229	97E5	Routine not used
152	7	9807	Destroy enemy
152	150	9896	Table points based on enemy types. Score = points * 100
152	176	98B0	Update attribute color for score points in HUD
152	201	98C9	Draw score on HUD
152	217	98D9	Draws lives number on HUD
152	236	98EC	Handle shield loss
153	24	9918	Draw shield power
153	69	9945	Increment score
153	106	996A	HUD flash
153	209	99D1	Commands table for HUD flash
153	227	99E3	Handle FINAL BOSS destruction
154	225	9AE1	Unused
154	229	9AE5	Draw explosion for FINAL BOSS
155	77	9B4D	Draw random attribute color for FINAL BOSS explosion
155	167	9BA7	Handle Rex Dead - Last live explossion
156	197	9CC5	Handle Rex dead - Main routine
156	247	9CF7	Rex and FINAL BOSS offsets for compute explosion position
156	253	9CFD	Rex and FINAL BOSS explosion position and index for graphic data
157	45	9D2D	Handle respawn
157	104	9D68	Handle Rex dead - Resume or finish game
158	5	9E05	Rex visibility active
158	21	9E15	Configure data for Rex teleporting when game begins or resume
158	61	9E3D	Configure data for Rex teleporting when dead
158	103	9E67	Handle Rex visibility during teleporting
158	228	9EE4	Initialize teleporting into room data
158	241	9EF1	Configure teleporting out of the room
159	11	9F0B	Table of teleporting mask data for FOOT MAN
159	21	9F15	Handle FOOT MAN teleporting
159	143	9F8F	Hide a portion of Rex to simulate teleporting
159	155	9F9B	Handle Rex atoms flush during teleporting
160	165	A0A5	Graphic data for atoms based on bits2-0 x-position of atom
160	173	A0AD	Rex atoms data during teleporting
160	248	A0F8	Handle Rex over special tiles
161	171	A1AB	FIRE key hold down
161	172	A1AC	Rex weapon in use
161	173	A1AD	Weapon energy level. Value on init $01
161	174	A1AE	Attribute file pointer to current weapon icon in HUD
161	176	A1B0	Tilt arrow tiles
161	177	A1B1	Weapon energy quantity - Value $00 on init
161	178	A1B2	Address pointer into tile type buffer based on Rex position
161	180	A1B4	Address pointer into tile buffer of the tile under the entity
161	182	A1B6	Counter for tile drawn on room graphic buffer
161	183	A1B7	Pointer to the tile type buffer for the currently draw tile
161	185	A1B9	Addres pointer to static enemy definition for the current room
161	187	A1BB	Nou used
161	193	A1C1	Horizontal position for windows
161	194	A1C2	Vertical position for windows
161	195	A1C3	Length of the longest line for the windows
161	196	A1C4	Number of lines for the windows
161	197	A1C5	Enemy enters the room from left
161	198	A1C6	Enemy enters the room from right
161	199	A1C7	Enemy enters the room from top
161	200	A1C8	Max number of enemies to be destroyed when Destroy all enemies indicator active
161	201	A1C9	Destroy all enemies indicator
161	202	A1CA	Address pointer into the enemy configuration buffer for the enemy to be destroyed when Destroy all enemies indicator is active
161	204	A1CC	Entity type
161	205	A1CD	Address for the graphic data of entity
161	207	A1CF	Unused
161	209	A1D1	Initialized but never used
161	210	A1D2	Address pointer into attribute file/buffers for score points
161	212	A1D4	Loop counter for score points
161	213	A1D5	Score points value
161	215	A1D7	Score - Value $0000 on init
161	217	A1D9	Rapid shots active - Value $00 on init
161	218	A1DA	Number of rapid shots
161	219	A1DB	HUD flash index - Value $FF on init
161	220	A1DC	Counter for enemy enter the room (updated)
161	221	A1DD	Counter for enemy enter the room (original)
161	222	A1DE	Train is generating on current room. Used at routine C9E3
161	223	A1DF	Address into train definition buffer. Used at routine C9E3
161	225	A1E1	Counter for train appearance. Used at routine C9E3
161	226	A1E2	Shield power active - Value $00 on init
161	227	A1E3	Unused
161	229	A1E5	Shield power key hold down
161	230	A1E6	Shield power - Value $63 on init
161	231	A1E7	Shield loss counter - Value $02 on init
161	232	A1E8	Machine gun weapon on inventory indicator
161	233	A1E9	Double Fire weapon on inventory indicator
161	234	A1EA	Laser weapon on inventory indicator
161	235	A1EB	Multiple weapon on inventory indicator
161	236	A1EC	Spray weapon on inventory indicator
161	237	A1ED	Projectile type of enemy
161	238	A1EE	Rex status - Value $00 on init
161	239	A1EF	Rex explosion counter
161	240	A1F0	Address pointer into Rex explosion data buffer to compute explosion position
161	242	A1F2	x-position of last respawn saved - Value $A0 on init
161	243	A1F3	y-position of last respawn saved - Value $60 on init
161	244	A1F4	room number of last respawn saved - Value $00 on init
161	245	A1F5	Room configured - Value $00 on init
161	246	A1F6	Rex visibility
161	247	A1F7	Number of lines of Rex to hide (used in teleporting animation)
161	248	A1F8	Atoms flush during teleporting
161	249	A1F9	Rex teleporting
161	250	A1FA	Teleporting counter
161	251	A1FB	Teleporting (begin game or dead)
161	252	A1FC	Number of lives
161	253	A1FD	Time bar update slot index - Value $00 on init
161	254	A1FE	Loop counter used for time bar in HUD
161	255	A1FF	Time bar update direction - Value $00 on init
162	0	A200	Number of time slots availables
162	1	A201	Laser duration - Value $00 on init
162	2	A202	Respawn indicator index value - Value $00 on init
162	3	A203	Shield recharger index value - Value $00 on init
162	4	A204	Initialized but never used
162	5	A205	Number of smartbombs in the inventory
162	6	A206	Unused
162	7	A207	Number of weapon that has energy
162	8	A208	Bonus windows number
162	9	A209	Unused
162	10	A20A	Rex inmortal - Value $00 on init
162	11	A20B	Rex speed - Value $00 on init
162	12	A20C	Rex speed up duration - Value $00 on init
162	13	A20D	Unused
162	15	A20F	Lives Score - Value $0000 on init
162	17	A211	Unused
162	19	A213	Rex on elevator
162	20	A214	Actor firing indicator
162	21	A215	Initialized but never used
162	22	A216	Bonus Windows Loop Counter
162	24	A218	Unused
162	33	A221	Type of mobile enemy for the current room
162	34	A222	Bio Growths killed - Value $0000 on init
162	36	A224	Minimum score for the game - Value $000A on init
162	38	A226	Room connection - right room number
162	39	A227	Room connection - top room number
162	40	A228	Room connection - bottom room number
162	41	A229	Room connection - left room number
162	42	A22A	Speed of Rex - Value $00 on init
162	43	A22B	Max number of enemies in the current room
162	44	A22C	Used in multiple routines as temporal variable
162	46	A22E	Used in multiple routines as temporal variable
162	48	A230	Used in multiple routines as temporal variable
162	50	A232	Used in multiple routines as temporal variable
162	51	A233	Unused
162	54	A236	Charcode for the digit introduced in password code
162	55	A237	Unused
162	56	A238	Multiple uses
162	58	A23A	Seed for pseudo-random number generator.
162	60	A23C	Seed status variable
162	61	A23D	Charcode buffer for number conversion
162	68	A244	Port used to read the key pressed
162	70	A246	Opcode of the corresponent BIT operation to check key presses
162	71	A247	Input device type
162	72	A248	X-position of entity
162	73	A249	Y-position of entity
162	74	A24A	Width of entity sprite (in bytes)
162	75	A24B	Height of entity sprite (in pixels)
162	76	A24C	Initialized in game, but not used
162	77	A24D	Unused
162	79	A24F	Rex x-position (in pixels) - Value $A0 on init
162	80	A250	Rex y-position (in pixels) - Value $60 on init
162	81	A251	Current room number
162	82	A252	Pointer to the address mapping table of tile graphics data and room graphics buffer
162	84	A254	Rex facing direction ($00 right / $01 left) - Value $00 on init
162	85	A255	Rex falling speed - Value $00 on init
162	86	A256	Rex is jumping - Value $00 on init
162	87	A257	Unused
162	89	A259	Address pointer into table for Rex jumping y-offsets
162	91	A25B	List number of the room displayed on attract-mode
162	92	A25C	Loop counter for run the displayed room on attract-mode
162	93	A25D	Tile type found checking the list of tile types (background or wall)
162	94	A25E	Address for the graphic data of entity to draw
162	96	A260	Number of digits entered in password
162	97	A261	Checksum code for password
162	99	A263	Score (LSB) and humans killed (MSB) from Rex (Side A)
162	101	A265	Shield power from Rex (Side A)
162	102	A266	Smartbombs from Rex (Side A)
162	103	A267	Number of lives from Rex (Side A)
162	104	A268	FINAL BOSS live status
162	105	A269	FINAL BOSS explosion counter
162	106	A26A	FINAL BOSS addres pointer to table offset for compute explosions position
162	108	A26C	Update timer bar in HUD
162	219	A2DB	Initialize time bar loop counters
162	230	A2E6	Draws a windows in the display file
163	77	A34D	Draw HUD
163	131	A383	Draw the sprites for the smartbomb icons in HUD (1/2)
163	153	A399	Data buffer for the smartbomb icons in HUD
163	159	A39F	Draw the sprites for the smartbomb icons in HUD (2/2)
163	170	A3AA	Offsets graphics data for smartbombs in HUD
163	186	A3BA	Draw the sprites for the weapon icons in HUD (1/2)
163	219	A3DB	Data buffer for the weapon icons in HUD
163	225	A3E1	Draw the sprites for the weapon icons in HUD (2/2)
163	244	A3F4	Text definition for HUD
164	50	A432	Copy room graphic buffer to display file
164	135	A487	Print the text content of the windows
165	16	A510	Routine not used
165	29	A51D	Pseudo-random number generator
165	86	A556	Reset display and attribute file
165	112	A570	Draw the number saved in charcode buffer at $A23D into display file
165	170	A5AA	Convert a number into a list of digits charcodes
166	18	A612	Configure and check key pressed routines for Rex movement
166	143	A68F	Pause game
166	156	A69C	Draw explosion debris
166	171	A6AB	Computes address position in tile type buffer based on (x,y) position on screen
166	221	A6DD	Computes address into attribute file based of (x,y)-pixel-position on screen
167	6	A706	Update arrow tiles, shield recharger and respawn indicator
167	125	A77D	Table of graphic data addresses for tile animation
167	147	A793	Initialise drones configuration data buffer
167	164	A7A4	Draw drones for multiple weapon
168	54	A836	Offset position table for drones
168	182	A8B6	Graphic data for drones
168	246	A8F6	Update weapon in inventory (HUD)
169	20	A914	Routine not used - Simulate conveyor belt going up from Rex (Side A)
169	37	A925	Routine not used - Simulate conveyor belt going down from Rex (Side A)
169	57	A939	Configure current room
169	134	A986	List of rooms in attract-mode
169	142	A98E	Main loop for attract-mode
170	0	AA00	Table of trajectories for seed plant projectiles
170	67	AA43	Graphic data for seed plant projectile
170	71	AA47	Table for address pointers into table of trajectories for seed plant projectiles
170	87	AA57	Position offsets for explosion debris
170	183	AAB7	Graphic data for explosion debris
170	247	AAF7	Text Definition Data - Start game, game over and in-game windows
172	146	AC92	Unused
172	154	AC9A	Display file lookup table
174	26	AE1A	List of ports for read the keys
174	42	AE2A	Charset for the corresponding key pressed
174	82	AE52	Invert byte lookup table
175	82	AF52	Offsets table for animated sprites
175	130	AF82	Graphic data for arrows tiles
175	194	AFC2	Enemy configuration for every room (26 rooms)
177	167	B1A7	Room directions and enemy pointers
178	67	B243	Reset room graphic buffer
178	150	B296	Draw an entity (enemy, object or player)
179	127	B37F	Copy tile graphic into room graphic data
179	184	B3B8	Rex fires weapon
180	124	B47C	Configuration data for REX spray weapon
180	156	B49C	Handle spray weapon fire
181	25	B519	Configure Rex spray weapon projectile
181	48	B530	Computes offset into the room graphic data based on projectile y-delta
181	76	B54C	Configure weapon sound and check for weapon free slot
181	196	B5C4	Routine not used
181	212	B5D4	Create a new projectile
182	139	B68B	Draw projectiles
185	190	B9BE	Laser graphics
185	230	B9E6	Update color attribute for weapon icon on HUD
186	9	BA09	Handle weapon energy increase
186	106	BA6A	Handle weapon energy loss
186	184	BAB8	Handle double energy loss
186	198	BAC6	Initialise weapon data (Laser)
186	220	BADC	Draw the windows borders in the display file
187	107	BB6B	Draw a row of borders for the windows
187	158	BB9E	Draw a 3x3 grid attribute color into attribute file if tile is background
187	234	BBEA	Copy a 3x3 grid of attribute color from attribute buffer to attribute file
188	11	BC0B	Copy the attribute file of the HUD (3 first rows) to the attribute buffer of the HUD
188	23	BC17	Draw random attribute color for explosion
188	72	BC48	Draw enemies (1/2)
191	75	BF4B	X-delta table for PLANT projectiles
191	79	BF4F	Draw enemies (2/2)
193	65	C141	Configure BULB projectiles
193	203	C1CB	Handle bubble bouncing and burst
194	83	C253	Bubble graphic data offsets
194	94	C25E	Handle explosion debris movement and draw it
194	223	C2DF	List of 'random' attribute colors for explosion
194	231	C2E7	Handle enemy lateral movement (1/2)
195	10	C30A	Routine not used
195	193	C3C1	Handle TRIANGLE
196	51	C433	Handle enemy lateral movement (2/2)
197	190	C5BE	Enemy configuration for FOOTMAN crouched or stand-by
197	232	C5E8	Handle FOOT MAN walking/stand-by state change
198	39	C627	Handle FOOT MAN walking/crouching state change
198	107	C66B	Routine not used
198	110	C66E	Enemy configuration for FOOT MAN jumping
198	145	C691	Handler for FOOT MAN jumping
199	33	C721	Handler for FOOT MAN falling
199	148	C794	Obtain the tile type address pointer under the entity
199	174	C7AE	Initialize graphic and attribute data buffers for current room
201	50	C932	Copy room color attribute buffer to attribute file
201	78	C94E	Routine not used - Wait some time - Remnant code from Rex (Side A)
201	91	C95B	Utilities routine - Multiply two values
201	98	C962	Configure room connection and enemies of the room
201	205	C9CD	Check for end game room
201	208	C9D0	Routine not used
201	227	C9E3	Generate train parts: front, middle or rear wagon
202	53	CA35	Creates a new mobile enemy on room
202	246	CAF6	Check if enemy can be generated in a position
203	65	CB41	Configure static enemies for the current room
203	119	CB77	Configure entity for the current room
205	68	CD44	Handle speed up duration
205	82	CD52	Configure Rex to move right
205	110	CD6E	Configure Rex to move left
205	139	CD8B	Handle Rex lateral movement
205	149	CD95	Move Rex left or right
205	184	CDB8	Handle Rex collision detection moving right
205	210	CDD2	Handle Rex collision detection moving left
205	245	CDF5	Check if a tile is a wall or a background
206	34	CE22	List of 'wall' type tiles
206	39	CE27	List of 'background' type tiles
206	48	CE30	Check room connection to the left
206	65	CE41	Check room connection to the right
206	82	CE52	Configure Rex for jump
206	104	CE68	FOOT MAN and Rex jumping y-offsets increments
206	115	CE73	Unused
206	116	CE74	Handle Rex jumping
206	229	CEE5	Handle Rex falling
207	89	CF59	Handle enemy projectile collision with Rex
207	181	CFB5	Handle collision detection of enemy with Rex and projectiles
210	68	D244	Address pointers into text definition windows for bonus
210	78	D24E	Handle Rex takes question
211	56	D338	Increment number of lives
211	70	D346	Reset sound data channels
211	111	D36F	Reset the 3 channel volumes of the AY-3-8912
211	127	D37F	Configure sound channel and mixer register
212	36	D424	Play sound channels
212	115	D473	Configure note for current channel
212	220	D4DC	Send channel volume command
212	241	D4F1	Send commands to AY-3-8912
212	251	D4FB	Sound data
213	202	D5CA	Channel data buffer por playing sound
213	226	D5E2	Unused
213	237	D5ED	Sound data mixer
213	238	D5EE	Unused
213	239	D5EF	Channel volumne number (1-3)
213	240	D5F0	Routine not used
214	9	D609	Show weapon bonus windows
214	88	D658	Draws an sprite
214	161	D6A1	Fill a rectangle with a color attribute in the attribute file
214	198	D6C6	Routine not used
214	200	D6C8	Unused
217	98	D962	Mapping table for tile graphic and room graphic buffer
218	192	DAC0	Main loop for the tile screen
219	39	DB27	Enter and decode password
220	167	DCA7	Text Definition Data - Input code windows
221	31	DD1F	Handle passsword code input
222	19	DE13	Defined keys for Rex controls
222	24	DE18	Unused
222	25	DE19	Keypress handlers for the title screen menu
223	198	DFC6	Text Defintion Data - Control configuration
224	204	E0CC	Tile count buffer (partial)
225	159	E19F	Unused
225	255	E1FF	Tile type buffer
228	159	E49F	Unused
228	255	E4FF	Title screen
255	255	FFFF	Unused