Gyruss: Memory map

Page	Byte	Address	Description
64	0	4000	Unused
112	0	7000	Center of projection
112	2	7002	Sprite data
113	130	7182	Number of allocated sprites
113	131	7183	Sprite allocation table
113	163	71A3	Temporary storage (72 bytes)
113	235	71EB	Status flags
113	236	71EC	Stars move countdown
113	237	71ED	Unused byte at 71ED
113	238	71EE	Sprite countdown
113	239	71EF	Countdown to enemy shooting
113	240	71F0	Time to next wave
113	241	71F1	Current player (0 or 1)
113	242	71F2	Frame counter
113	243	71F3	Score player 1
113	246	71F6	Score for getting extra life player 1
113	248	71F8	Score for getting extra life player 1 MSB
113	249	71F9	Score player 2
113	252	71FC	Score for getting extra life player 2
113	254	71FE	Score for getting extra life player 2 (MSB)
113	255	71FF	Lives
114	0	7200	Stage (0-23, but starts with 1 during play)
114	1	7201	Wave
114	2	7202	Enemies destroyed not chance stage
114	3	7203	Stage data index
114	4	7204	Number of times died within stage
114	5	7205	Completed stages
114	6	7206	Number of enemies
114	7	7207	Map of center enemies
114	43	722B	Number of center enemies
114	44	722C	Number of active enemies
114	45	722D	Number of 3-spheres/mines left
114	46	722E	Ship background data
114	55	7237	Mines background data
114	82	7252	Active enemy shots
114	83	7253	Number of active shots
114	84	7254	Mines destroyed
114	85	7255	Enemies destroyed in chance stage
114	86	7256	Other flags
114	87	7257	Countdown to screen off
114	89	7259	Counter used when approaching planet
114	90	725A	Interrupt flag
114	91	725B	Wave speed counter
114	92	725C	Number of enemies left center
114	93	725D	Wave data address
114	95	725F	Laser fence/meteor countdown
114	96	7260	Attack countdown
114	97	7261	Laser fence end 2 polar x
114	98	7262	Laser fence end 1 polar x
114	99	7263	Countdown. Mines are destroyed when zero.
114	100	7264	Mines action
114	101	7265	Mines are destroyed if bit 0 is set
114	102	7266	Related to when mines reappear
114	103	7267	Mines movement table offset
114	104	7268	Mine name/pattern index
114	105	7269	Mine countdown to shoot
114	106	726A	Pattern decoder length
114	108	726C	Pattern decoder bits left
114	109	726D	Pattern decoder source byte
114	110	726E	Flag for showing double shot pickup
114	111	726F	Temporary polar x
114	112	7270	Pointer to data for PSG noise generator
114	114	7272	Pointer to data for PSG tone generator 1
114	116	7274	Pointer to data for PSG tone generator 2
114	118	7276	Pointer to data for PSG tone generator 3
114	120	7278	Last noise operation
114	122	727A	Is a tune playing?
114	123	727B	Sound player countdown (tune speed?)
114	124	727C	Index of tune playing
114	125	727D	Tune data channel 1
114	135	7287	Tune data channel 2
114	145	7291	Tune data channel 3
114	155	729B	Tune data channel 4
114	165	72A5	Sound fx data channel 1
114	173	72AD	Sound fx data channel 2
114	181	72B5	Sound fx data channel 3
114	189	72BD	Sound fx data channel 4
114	190	72BE	Byte 1-2 of sound fx data 4
114	192	72C0	Byte 3-4 of sound fx data 4
114	194	72C2	Byte 5 of sound fx data 4
114	195	72C3	Byte 6-7 of sound fx data 4
114	197	72C5	Temporary center of projection
114	199	72C7	Temp sprite data
114	200	72C8	Temp points to add
114	203	72CB	Update counters countdown
114	204	72CC	Center enemies redraw flag
114	205	72CD	Counter for drawing center enemies
114	206	72CE	First name used for center enemies 1
114	207	72CF	First name used for center enemies 2
114	208	72D0	Pattern table address of center enemies
114	210	72D2	Center y direction
114	211	72D3	Center y offset
114	212	72D4	Center x offset
114	213	72D5	Sprite type processed
114	214	72D6	Transformation processed
114	215	72D7	Pattern index
114	216	72D8	Destination address in VDP
114	218	72DA	Graphics pointer address
114	220	72DC	Source address
114	222	72DE	Pattern address
114	224	72E0	Sprite patterns addresses in VDP
115	26	731A	Star frame
115	27	731B	Random number
115	29	731D	Stack
115	186	73BA	OS RAM
115	242	73F2	Sprite allocation table VDP address
115	244	73F4	Sprite pattern table VDP address
115	246	73F6	Name table VDP address
115	248	73F8	OS RAM
116	0	7400	Unused
128	0	8000	ROM header
128	2	8002	Pointer to sprite name table
128	4	8004	Pointer to sprite order table
128	6	8006	Pointer to temporary storage in RAM
128	8	8008	Pointer to controller memory map
128	10	800A	Pointer to start address
128	12	800C	RST $08
128	15	800F	RST $10
128	18	8012	RST $18
128	21	8015	RST $20
128	24	8018	RST $28
128	27	801B	RST $30
128	30	801E	RST $38
128	33	8021	NMI
128	36	8024	Entry point
128	232	80E8	Main loop
129	57	8139	Died
129	112	8170	Lose life
129	174	81AE	Switch player
129	237	81ED	Wait for restart
130	18	8212	Init stage
131	14	830E	Display player message
131	42	832A	Stage completed
131	208	83D0	Next stage
132	41	8429	Display bonus
132	80	8450	Display hits
132	107	846B	Perfect bonus
132	177	84B1	Update frames and upload sprites
132	203	84CB	Upload patterns
132	219	84DB	Get stage data address
132	237	84ED	Clear rows 9 and 14
133	1	8501	Interrupt routine
133	60	853C	STAGE message
133	65	8541	Stage data (8 bytes per stage)
133	129	8581	PLAYER message
133	137	8589	READY message
133	143	858F	CHANCE STAGE message
133	156	859C	WARPS message
133	162	85A2	TO message
133	166	85A6	BONUS message
133	171	85AB	Bonus points message
133	185	85B9	CONGRATULATIONS message
133	201	85C9	PERFECT message
133	221	85DD	GAME OVER message
133	230	85E6	Process sprites
134	84	8654	Deallocate enemy
134	90	865A	Handle sprite type $02
134	125	867D	Handle sprite type $04 - $0C
134	222	86DE	Handle sprite type $14
134	233	86E9	Handle sprite types $12 - $13
135	12	870C	Handle sprite type $03
135	62	873E	Handle sprite types $15 - $17
135	144	8790	Handle sprite types $0E - $11
135	213	87D5	Create map entry for enemy sprite
136	21	8815	Enemy movement: Return enemy to map
136	37	8825	Enemy movement: Move enemy towards viewer
136	53	8835	Enemy movement: Determine action when out of screen
136	95	885F	Enemy movement: Create enemy shot and move towards player.
136	120	8878	Enemy movement: Polar Y of enemy < $22
136	167	88A7	Enemy movement: Called with random probability.
136	190	88BE	Enemy movement: Called with random probability.
136	212	88D4	Enemy movement: Counter is >(=) $40
136	243	88F3	Enemy movement: Counter is $41
136	254	88FE	Enemy movement: Update sprite path
137	43	892B	Enemy movement: Upper nybble >= 1
137	54	8936	Enemy movement: Move sprite along path and update sprite type
137	134	8986	Enemy movement: Set sprite flags to $18 if ...
137	148	8994	Enemy movement: Set sprite flags to $04
137	153	8999	Enemy movement: Set sprite flags to $40
137	158	899E	Handle sprite types $18 - $1C
137	235	89EB	Circular enemy movement: Move sprite along path
138	45	8A2D	Circular enemy movement: Move enemy towards viewer
138	60	8A3C	Circular enemy movement: Set sprite flags to $04
138	65	8A41	Return from sprite handler
138	83	8A53	When all sprites have been processed
138	118	8A76	Create enemy shot if conditions are met
138	192	8AC0	Move towards x
138	230	8AE6	Reset enemy sprite types after dying
139	18	8B12	Draw background patterns for sprite
139	217	8BD9	Manage waves
140	7	8C07	Manage wave = 4
140	30	8C1E	All waves completed
140	48	8C30	Manage wave < 4
140	82	8C52	Start new wave
140	104	8C68	When wave is initiating
141	33	8D21	Reset outcoming enemies
141	80	8D50	Create "laser fence" or meteor
141	215	8DD7	Create meteor
142	13	8E0D	Enemy types in different waves (chance stage)
142	37	8E25	Enemy movement table
142	45	8E2D	Create or display mines
142	137	8E89	Init mine variables
142	157	8E9D	Create mines
143	15	8F0F	Create mine
143	85	8F55	Display mines
143	237	8FED	Destroy mine
144	14	900E	Create shot from mine
144	70	9046	Mines movement table
144	86	9056	3 spheres background graphics
144	150	9096	Mine background graphics
144	214	90D6	Start screen
145	117	9175	Display planet
145	161	91A1	Erase planet
145	204	91CC	Display planet name and sprites
146	13	920D	Clear name table row 7
146	31	921F	Decompress and upload patterns
146	78	924E	Write single byte
146	85	9255	Read B bits into A
146	133	9285	Copy planet patterns
146	172	92AC	Parker Brothers copyright message
146	195	92C3	Colors
146	214	92D6	Ship pattern
146	222	92DE	Gyruss logo
146	224	92E0	Logo patterns
147	128	9380	Gyruss logo names
147	152	9398	Planet table
147	164	93A4	Neptune
147	181	93B5	NEPTUNE message
147	188	93BC	Neptune sprite data
147	199	93C7	Uranus
147	216	93D8	URANUS message
147	222	93DE	Uranus sprite data
147	241	93F1	Saturn
148	2	9402	SATURN message
148	8	9408	Saturn sprite data
148	23	9417	Jupiter
148	40	9428	JUPITER message
148	47	942F	Jupiter sprite data
148	56	9438	Mars
148	73	9449	MARS message
148	77	944D	Mars sprite data
148	84	9454	Earth
148	101	9465	EARTH message
148	106	946A	Earth sprite data
148	116	9474	Byte before planet graphics
148	117	9475	Planet graphics - compressed
150	238	96EE	Planet colors
150	254	96FE	Planet sprite patterns
151	150	9796	Handle collisions
152	69	9845	Create double shot pickup sprite
152	97	9861	Handle shot (from ship) collision
153	36	9924	Shot hit sprite
153	52	9934	Shot hit sprite enemy
153	120	9978	Add score when enemy destroyed
153	160	99A0	Shot hit center enemy
153	177	99B1	Shot hit mine
154	8	9A08	Shot hit laser fence
154	28	9A1C	Remove shot
154	56	9A38	Collision of ship with sprite
154	73	9A49	Collision of ship with enemy
154	117	9A75	Collision of ship with mine
154	134	9A86	Polar x distance
154	167	9AA7	Score table
154	179	9AB3	Add A to HL (RST $08)
154	187	9ABB	Unused routine at 9ABB
154	195	9AC3	VDP write byte (RST $10)
154	208	9AD0	VDP read byte
154	222	9ADE	Init sound
155	13	9B0D	Play tune
155	89	9B59	Increase attenuation for all tune channels
155	135	9B87	Stop tune
155	153	9B99	Sound player
155	217	9BD9	Handle frequency byte when tune index >= 3
155	248	9BF8	Relative jump then tune index >= 3
155	253	9BFD	Handle duration byte when tune index >= 3
156	28	9C1C	Process tune byte
156	57	9C39	Handle absolute or relative jump
156	70	9C46	Relative jump then check finished
156	75	9C4B	Process normal duration and frequency
156	126	9C7E	End of processing sound channel
156	146	9C92	Handle relative jump
156	160	9CA0	Make a relative jump
156	168	9CA8	Play sound FX
156	191	9CBF	Copy data from sound_fx_data_table to sound fx channel, and change pointer from sound data to sound fx data
156	231	9CE7	Sound fx data
157	61	9D3D	Sound fx done
157	103	9D67	Execute commands for all sound fx channels
157	145	9D91	Sound command jump table
157	167	9DA7	Sound FX command 3
157	185	9DB9	Sound FX command 6
157	196	9DC4	Sound FX command 1,4
157	215	9DD7	Sound FX command 2
157	232	9DE8	Sound FX command 0
158	1	9E01	Sound FX command 5,8
158	92	9E5C	Sound FX command 7
158	117	9E75	Sound FX command 9
158	145	9E91	Call play tune, preserve registers
158	163	9EA3	Call play sound, preserve registers
158	182	9EB6	Sound frequency table
158	234	9EEA	Tune data
159	42	9F2A	Tune data 1
159	62	9F3E	Tune data 2
159	78	9F4E	Tune data 3
159	98	9F62	Tune data 4
159	108	9F6C	Tune data 5
159	110	9F6E	Tune data 6
159	121	9F79	Tune data 7
159	131	9F83	Tune data 8
159	139	9F8B	Tune data 9
159	143	9F8F	Tune data 10
159	148	9F94	Tune data 11
159	254	9FFE	Tune data 12
160	86	A056	Tune data 13
160	93	A05D	Tune data 14
160	113	A071	Tune data 15
160	146	A092	Tune data 16
160	148	A094	Tune data 17
161	58	A13A	Tune data 18
161	62	A13E	Tune data 19
161	202	A1CA	Tune data 20
161	208	A1D0	Tune data 21
162	58	A23A	Tune data 22
162	63	A23F	Tune data 23
162	153	A299	Tune data 24
162	175	A2AF	Tune data 25
162	182	A2B6	Tune data 26
162	187	A2BB	Send data for all channels to PSG
162	243	A2F3	Send data for noise channel to PSG
163	3	A303	Send attenuation or noise control bytes to PSG
163	20	A314	Send data for tone channel to PSG
163	29	A31D	Send attenuation and frequency bytes to PSG
163	59	A33B	Initial game loop
163	225	A3E1	Explode
164	113	A471	Move explosion dots
164	178	A4B2	Init data for implosion
164	184	A4B8	Sprite init data (polar x)
164	190	A4BE	Init data for wave sprites
165	30	A51E	Init data for wave sprites (chance stage)
165	126	A57E	Polar y for wave sprites
165	129	A581	Wave data address table
165	163	A5A3	Wave path 0
165	174	A5AE	Wave path 1
165	192	A5C0	Wave path 2
165	204	A5CC	Wave path 3
165	227	A5E3	Wave path 4
165	248	A5F8	Wave path 5
166	13	A60D	Wave path 6
166	24	A618	Wave path 7
166	35	A623	Wave path 8
166	46	A62E	Wave path 9
166	56	A638	Wave path 10
166	66	A642	Wave path 11
166	81	A651	Wave path 12
166	93	A65D	Wave path 13
166	108	A66C	Wave path 14
166	118	A676	Wave path 15
166	138	A68A	Wave path 16
166	153	A699	Display score
166	200	A6C8	Display digit
166	210	A6D2	Display lives
166	236	A6EC	Add points to score
167	60	A73C	Control ship
167	213	A7D5	Fire double shot
168	5	A805	Clear fire pressed
168	8	A808	Display ship background patterns
168	101	A865	Controller movement table
168	117	A875	Adjust ship coordinates table
168	125	A87D	Ship background patterns
170	125	AA7D	Init center enemies
170	166	AAA6	Allocate map entry
170	227	AAE3	Deallocate map entry
170	241	AAF1	Create enemy sprite from map entry
171	56	AB38	Sprite coordinates from map
171	83	AB53	Deallocate sprite from map
171	114	AB72	Display distant enemies at the center of the screen
171	255	ABFF	Update name table to display center enemies
172	50	AC32	Erase center enemies
172	71	AC47	Plot pixel
172	135	AC87	Start coordinates for sprites
172	207	ACCF	Table of pixel offsets for drawing center enemies
172	223	ACDF	Init sprite data
172	249	ACF9	Upload sprite data to VDP
173	73	AD49	Allocate sprite (RST $28)
173	139	AD8B	Load sprite pattern (RST $30)
174	84	AE54	Handle sprite outside visible screen
174	148	AE94	Upload sprite patterns
175	107	AF6B	Rotate pattern
175	174	AFAE	Flip pattern vertically
175	194	AFC2	Flip pattern horizontally
175	221	AFDD	Ship exhaust position relative to ship body
175	255	AFFF	Display stars
176	35	B023	Display star frame
176	79	B04F	Star frame lookup
176	91	B05B	Star frame 0
176	130	B082	Star frame 1
176	168	B0A8	Star frame 2
176	205	B0CD	Star frame 3
176	236	B0EC	Star frame 4
177	14	B10E	Star frame 5
177	52	B134	Stars
177	54	B136	Star patterns
177	198	B1C6	Convert polar to screen coordinates
178	29	B21D	Polar to screen coordinates lookup table
184	221	B8DD	Graphics pointer offsets
184	250	B8FA	Graphics pointers
185	230	B9E6	Graphics
191	174	BFAE	Random number generator (RST $20)
191	207	BFCF	Unused
192	0	C000	Unused