jetpac: Memory map

Page	Byte	Address	Description
92	203	5ccb	Stack: 37 bytes of memory allocated for use as the system stack.
92	240	5cf0	High score for current game session.
92	243	5cf3	Game options.
92	244	5cf4	Player one score.
92	247	5cf7	Player two score.
92	250	5cfa	Padding to make block from hi_score to here 16 bytes in length.
93	0	5d00	Jetman direction.
93	1	5d01	Jetman X position.
93	2	5d02	Jetman Y position.
93	3	5d03	Jetman sprite colour attribute.
93	4	5d04	Jetman moving direction.
93	5	5d05	Jetman Speed: Horizontal.
93	6	5d06	Jetman Speed: Vertical.
93	7	5d07	Jetman sprite height, which is always $24, as set by the defaults.
93	8	5d08	Laser beams
93	40	5d28	Sound type parameters for explosions.
93	42	5d2a	Explosion params padding, making 8 bytes total. Unused.
93	48	5d30	Rocket object attributes.
93	56	5d38	Rocket module state (fuel/part).
93	64	5d40	Current Collectible object.
93	72	5d48	Thruster/Explosion animation sprite state.
93	80	5d50	Alien state objects.
93	128	5d80	Jetman exploding animation object.
93	136	5d88	Jetman object backup for the inactive player.
93	144	5d90	Unused padding.
93	152	5d98	Rocket/collectible object backup for the inactive player.
93	176	5db0	Unused padding.
93	184	5db8	Unused padding.
93	192	5dc0	Temporary actor state.
93	200	5dc8	Value only changes while Jetman is moving up/down - has no obvious pattern.
93	201	5dc9	Alien direction update flag for: Squidgy, UFO, Sphere, Crossed Ship.
93	202	5dca	Jetman speed modifier.
93	203	5dcb	Current alien ID being updated?
93	204	5dcc	Game timer.
93	206	5dce	Random Number.
93	207	5dcf	Temporary actor coordinates.
93	209	5dd1	Current active player.
93	210	5dd2	Jetman Rocket module attached success.
93	211	5dd3	Rocket modules attached.
93	212	5dd4	Holds a copy of the last SYSVAR_FRAMES counter.
93	213	5dd5	Has a frame ticked over.
93	214	5dd6	Current menu item colour attribute.
93	215	5dd7	"Get Ready" delay timer.
93	216	5dd8	Unused padding.
93	240	5df0	Game level for current player.
93	241	5df1	Current player lives remaining.
93	242	5df2	Unused padding for player level/lives object (8 bytes total).
93	248	5df8	Game level for inactive player.
93	249	5df9	Inactive player lives remaining.
93	250	5dfa	Unused padding for inactive player level/lives object (8 bytes total).
94	0	5e00	Buffers for Alien sprites.
94	204	5ecc	Buffers for Collectible/Rocket sprites.
95	152	5f98	Unused padding.
96	0	6000	PC starts here, after game load.
96	3	6003	Platform GFX location and size.
96	19	6013	Default player object state.
96	27	601b	Default Rocket and module objects state.
96	51	6033	Default Rocket module state is a Fuel Pod.
96	59	603b	Default collectible item state.
96	67	6043	Main menu copyright message.
96	100	6064	Reset the screen to its default state.
96	131	6083	Initialises a new level.
96	148	6094	Initialise the level.
96	167	60a7	Reset all rocket module states to their defaults.
96	183	60b7	End of turn for the current player.
97	68	6144	Swap current/inactive player/rocket states.
97	97	6161	Text for game over message.
97	116	6174	Initialise player for new turn.
97	151	6197	Flash 1UP or 2UP score label for active player.
97	160	61a0	Set flash state for the 3-attributes of the score label.
97	173	61ad	Turn off flashing of 1UP or 2UP score label for active player.
97	186	61ba	Flash 2UP score label.
97	191	61bf	Game initialisation for first run.
97	201	61c9	Reset system and show menu screen.
97	213	61d5	Show menu screen and handle menu selection.
98	52	6234	Display the main menu items to the screen.
98	97	6261	Colour attributes for main menu.
98	103	6267	Vertical position of each line of text in the main menu.
98	109	626d	Text displayed on the main menu screen
98	202	62ca	Write a single line of text on the main menu screen.
98	218	62da	Reset current and inactive player data on new game.
98	254	62fe	Start a new game.
99	16	6310	Reset stack pointer and enable interrupts before running main loop.
99	28	631c	The main game loop.
99	52	6334	Performs a main loop update jump.
99	61	633d	Main game loop jump table.
99	97	6361	Update the high score.
99	163	63a3	Update Jet Fighter.
100	86	6456	Alien SFX when killed by collision.
100	97	6461	Jetman collects a collectible item.
100	139	648b	Drop a new collectible item.
100	150	6496	Item drop jump table.
100	160	64a0	Drop a gold bar collectible item.
100	164	64a4	Display a collectible sprite.
100	174	64ae	Sprite offset using colour attribute.
100	177	64b1	Get address for collectible sprite.
100	188	64bc	Drop a Plutonium collectible item.
100	194	64c2	Drop a chemical based item, flashing items radiation and plutonium.
100	215	64d7	Drop a random coloured collectible item.
100	232	64e8	Collision detection for collectible items / rocket modules.
101	8	6508	Increment Y position and draw sprite.
101	14	650e	Redraw a sprite.
101	20	6514	Gets collectible ID based on the current user level.
101	35	6523	Collect Rocket module or fuel pod.
101	65	6541	Carry a collected rocket module/fuel pod.
101	101	6565	Pick up and carry a rocket module/fuel pod.
101	168	65a8	Release new collectible item.
101	219	65db	Calculate column on which to drop a new collectible item/fuel pod.
101	233	65e9	Horizontal column positions for dropping collectibles.
101	249	65f9	Drop a new fuel pod collectible.
102	36	6624	Reset the Rocket modules state data ready for next level.
102	41	6629	Set objects as inactive.
102	50	6632	Animate the rocket flame sprites.
102	144	6690	Rocket ship is taking off.
102	180	66b4	Rocket ship is landing.
102	208	66d0	Update the rocket ship.
102	252	66fc	Update Rocket ship colour.
103	140	678c	Rocket and collectible sprite address lookup table.
103	182	67b6	Rocket thruster SFX, and Jet Fighter explosions.
103	198	67c6	SFX for ship building.
103	204	67cc	SFX for collecting a fuel cell.
103	210	67d2	SFX for collecting an item, and when Jetman appears on-screen.
103	214	67d6	Play square wave sound.
103	219	67db	Play square wave sound, starting with silence.
103	231	67e7	SFX for Laser Fire.
103	253	67fd	Set the default explosion SFX params.
104	16	6810	Default explosion SFX parameters.
104	20	6814	Play Jetman death SFX.
104	29	681d	Play enemy death SFX.
104	40	6828	Plays the explosion sound effect.
104	57	6839	Sound has finished playing.
104	62	683e	Animate explosion after killing an alien.
104	93	685d	Enable animation, state false.
104	104	6868	Enable animation and reset frame count.
104	116	6874	Enable animation, state true.
104	122	687a	Animates the explosion sprites.
104	216	68d8	Explosion sprites lookup table.
104	228	68e4	Frame rate limiter.
104	242	68f2	Copy the two sprites for an alien to the buffers.
105	14	690e	Alien sprite lookup table.
105	46	692e	Frame update and disabled item drop.
105	84	6954	New actor: reset the modified code to original values.
105	102	6966	Reset the modified code within the current frame.
105	113	6971	Generate new game actor: alien, fuel, or collectible item.
106	45	6a2d	New item object types for each level - 8 bytes for 8 levels.
106	53	6a35	Update Squidgy Alien.
106	184	6ab8	Update UFO alien -- this alien is a chaser!
107	235	6beb	Add points for UFO kill.
107	241	6bf1	When alien was killed by laser fire, reset anim state, set explosion SFX params. Used by the routine at 6a35.
107	248	6bf8	Update Sphere alien.
108	176	6cb0	Update Actor direction.
108	190	6cbe	Update crossed space ship.
109	67	6d43	Draw an alien sprite to the screen.
109	89	6d59	Add score for crossed space ship kill.
109	92	6d5c	Alien Killed SFX #2.
109	103	6d67	Change alien direction flag to up, and other updates.
109	148	6d94	Default alien state.
109	156	6d9c	Update the meteor.
109	233	6de9	Alien Collision.
110	27	6e1b	Fire a laser beam.
110	102	6e66	Reads 2 bytes of pixel data from a sprite.
110	124	6e7c	Reverse all bits in Accumulator.
110	135	6e87	Flip byte pair of an alien sprite so it faces opposite direction.
110	165	6ea5	Write all sprite pixel bytes to buffer.
110	194	6ec2	Copy Rocket sprites for current level to the buffers.
110	239	6eef	Initialise rocket build state for new level.
111	11	6f0b	Copy Rocket sprite pixel data to the buffer.
111	22	6f16	Set the rocket building state on Jetman.
111	32	6f20	Set rocket module state that Jetman was carrying.
111	35	6f23	Get address to sprite pixel data then copy to the buffer.
111	42	6f2a	Copies the sprite pixel data to a buffer.
111	90	6f5a	Create new laser beam.
111	112	6f70	Initialise laser beam slot, and draw graphics.
111	134	6f86	Draw laser beam.
111	178	6fb2	Laser beam colour attribute table.
111	182	6fb6	Shoots a laser beam to the right.
111	197	6fc5	Animate a laser beam.
112	109	706d	Display the remaining player lives in the status bar.
112	164	70a4	Icon sprite of the little person shown next to number of lives.
112	172	70ac	Gets the remaining lives for player 1.
112	178	70b2	Reads the current player lives.
112	182	70b6	Reads inactive player lives.
112	186	70ba	Gets the remaining lives for player 2.
112	194	70c2	Add points to the active player's score.
112	229	70e5	Updates display to show player 1 score.
112	237	70ed	Updates display to show player 2 score.
112	245	70f5	Updates display to show high score.
112	251	70fb	Display a score.
113	21	7115	Display an ASCII character from the Font.
113	36	7124	Characters are 8 rows of pixels.
113	38	7126	Draw the pixels for an ASCII character on screen
113	52	7134	Display string (with colour) on the screen.
113	64	7140	Write a list of ASCII characters to the screen.
113	81	7151	Write an EOL character to the screen.
113	90	715a	Displays score labels at top of screen.
113	117	7175	GFX score labels.
113	121	7179	Data block at 7179
113	125	717d	Data block at 717d
113	128	7180	Clears the entire ZX Spectrum display file.
113	133	7185	Clear memory block with null.
113	135	7187	Fill a memory block with a byte value.
113	142	718e	Clears the entire ZX Spectrum attribute file.
113	151	7197	Colourize a sprite.
113	214	71d6	Convert a Y,X pixel coordinate to an ATTRIBUTE_FILE address.
113	236	71ec	Generic jump routine for finding actor pos/dir.
113	239	71ef	Get location of Actor.
113	242	71f2	Get sprite position and dimensions.
114	0	7200	Increment DE to beginning of next sprite header.
114	4	7204	Find actor sprite address and update actor.
114	7	7207	Update actor state.
114	38	7226	Update Actor X/Y positions.
114	50	7232	Now update and erase the actor.
114	57	7239	Erase an actor sprite - after an it's been moved.
114	99	7263	Find animation sprite position and erase its pixels.
114	104	7268	Find Actor position, then erase its sprite.
114	109	726d	Find an Actor and destroy it.
114	112	7270	Erase a destroyed Actor.
114	125	727d	Unused?
114	128	7280	Erase an animation sprite.
114	137	7289	Find position and direction of an Actor.
114	146	7292	Get actor sprite address.
114	171	72ab	Move an actor's sprite to it's current position.
114	182	72b6	Calculate screen address one pixel above current position.
114	208	72d0	Convert a Y,X pixel coordinate to a DISPLAY_FILE address.
114	239	72ef	Copy actor position/direction values to Actor.
115	2	7302	Joystick Input (Interface 2)
115	9	7309	Read input from the keyboard port.
115	63	733f	Check if fire button is pressed.
115	94	735e	Check if thrust (up) button is pressed.
115	125	737d	Game play starts, or prepare new turn, or check Jetman thrust input.
115	158	739e	Airborne Jetman update.
115	195	73c3	Increase Jetman horizontal speed.
115	209	73d1	Update Jetman X speed with new value.
115	214	73d6	Set Jetman X speed to the max flying speed.
115	218	73da	Fly Jetman horizontally.
115	241	73f1	Apply gravity to Jetman if no thrust button detected.
116	18	7412	Check if Jetman is moving falling downward.
116	37	7425	Increase Jetman vertical speed.
116	51	7433	Update Jetman vertical speed with new value.
116	56	7438	Set Jetman vertical speed to zero.
116	62	743e	Check joystick input for FIRE or THRUST.
116	72	7448	Set Jetman vertical speed to maximum.
116	76	744c	Fly Jetman vertically.
116	99	7463	Check vertical position while in mid-flight.
116	115	7473	Jetman flight collision detection.
116	146	7492	Redraw Jetman sprite on the screen.
116	161	74a1	Jetman hits the underneath of a platform.
116	167	74a7	Jetman lands on a platform.
116	191	74bf	Reset Jetman movement direction.
116	197	74c5	Jetman hits the top of the screen.
116	213	74d5	Jetman is falling.
116	224	74e0	Flip vertical direction Jetman is flying.
116	250	74fa	Decrease Jetman X position.
117	1	7501	Jetman THRUST-LEFT input.
117	12	750c	Flip Jetman left/right flying direction.
117	38	7526	Move Jetman up: decrease Y position.
117	45	752d	Calculate new Jetman horizontal speed.
117	60	753c	Jetman walking.
117	209	75d1	Related to horizontal platform collision detection - possibly flipping between sprite X position collision and Jetman direction collision...needs more work!
117	232	75e8	Jetman/platform collision detection.
117	237	75ed	Horizontal platform collision detection for Jetman/Alien.
117	252	75fc	Vertical platform collision detection for Jetman/Aliens.
118	56	7638	Displays platforms on screen.
118	166	76a6	Draws the pixels for a platform sprite to the screen.
118	173	76ad	Platform sprite: left.
118	181	76b5	Platform sprite: middle (repeated for width).
118	189	76bd	Platform sprite: right.
118	197	76c5	Sprite/Buffer lookup tables.
118	229	76e5	Lookup table for the alien sprites buffer addresses.
119	5	7705	Erase sprite pixels when actor/sprite moves.
119	71	7747	EXX then update Actor.
119	72	7748	Update Actor height related values.
119	91	775b	Update Actor sprite height, then mask the sprite.
119	97	7761	Jetman sprite for flying right #1.
119	148	7794	Jetman sprite for flying right #2.
119	223	77df	Jetman sprite for flying right #3.
120	42	782a	Jetman sprite for flying right #4.
120	117	7875	Jetman sprite for flying left #1.
120	168	78a8	Jetman sprite for flying left #2.
120	219	78db	Jetman sprite for flying left #3.
121	38	7926	Jetman sprite for flying left #4.
121	113	7971	Jetman sprite for walking left #1.
121	164	79a4	Jetman sprite for walking left #2.
121	215	79d7	Jetman sprite for walking left #3.
122	34	7a22	Jetman sprite for walking left #4.
122	109	7a6d	Jetman sprite for walking right #1.
122	160	7aa0	Jetman sprite for walking right #2.
122	211	7ad3	Jetman sprite for walking right #3.
123	30	7b1e	Jetman sprite for walking right #4.
123	105	7b69	Meteor sprite #1.
123	128	7b80	Meteor sprite #2.
123	151	7b97	Explosion sprite: BIG.
123	202	7bca	Explosion sprite: MEDIUM.
123	253	7bfd	Explosion sprite: SMALL.
124	48	7c30	U3 Rocket ship sprite: bottom.
124	83	7c53	U3 Rocket ship sprite: middle.
124	118	7c76	U3 Rocket ship sprite: top.
124	153	7c99	U1 Rocket ship sprite: bottom.
124	188	7cbc	U1 Rocket ship sprite: middle.
124	223	7cdf	U1 Rocket ship sprite: top.
125	2	7d02	U5 Rocket ship sprite: bottom.
125	37	7d25	U5 Rocket ship sprite: middle.
125	72	7d48	U5 Rocket ship sprite: top.
125	107	7d6b	U4 Rocket ship sprite: bottom.
125	142	7d8e	U4 Rocket ship sprite: middle.
125	177	7db1	U4 Rocket ship sprite: top.
125	212	7dd4	Gold bar collectible sprite.
125	231	7de7	Fuel pod sprite.
126	0	7e00	Radiation collectible sprite.
126	25	7e19	Chemical weapon collectible sprite.
126	54	7e36	Plutonium collectible sprite.
126	75	7e4b	Diamond collectible sprite.
126	102	7e66	Squidgy Alien sprite #1.
126	131	7e83	Squidgy Alien sprite #2.
126	160	7ea0	Jet Plane sprite.
126	175	7eaf	Flying Saucer sprite.
126	192	7ec0	Sphere alien sprite #1.
126	225	7ee1	Sphere alien sprite #2.
126	254	7efe	Crossed Space craft sprite.
127	29	7f1d	Space craft sprite.
127	58	7f3a	Frog Alien sprite.
127	87	7f57	Rocket Flame sprite #1.
127	122	7f7a	Rocket Flame sprite #2.
127	179	7fb3	Jetpac loading screen image
154	179	9ab3	ZX Spectrum font sprites.