Memory map

Page	Byte	Address	Description
64	0	4000	Loading Screen
91	254	5BFE	Stack
93	192	5DC0	Game Initialise
94	36	5E24	Populate Room Buffer
94	114	5E72	Command 04: Switch Tile Set
94	146	5E92	Command 01: Skip Tiles
94	170	5EAA	Command 02: Draw Repeated Tile
94	200	5EC8	Command 08 (Or Higher): Single Tile
94	219	5EDB	Command 03: Fill Attribute Buffer With Single Colour
95	53	5F35	Draw Room Tile
95	161	5FA1	Screen Initialised Flag
95	162	5FA2	Input State
95	163	5FA3	Unused
95	164	5FA4	Previous Input State
95	165	5FA5	Percy Facing Direction
95	166	5FA6	Input Mode
95	167	5FA7	Falling State
95	168	5FA8	Collision Flag
95	169	5FA9	Flag: Egg State
95	170	5FAA	Flag: Carrying A Worm
95	171	5FAB	Energy Bar Delay Counter
95	172	5FAC	Flag: Worm Drop
95	173	5FAD	Flag: Landed On Platform Flag
95	174	5FAE	Movement Speed
95	175	5FAF	Percy Flap Counter
95	176	5FB0	Percy Animation Counter
95	177	5FB1	Current Level
95	178	5FB2	Worms Remaining
95	179	5FB3	Lives Display Character
95	180	5FB4	Chick Animation States
95	181	5FB5	Room Object Data Pointer
95	183	5FB7	Beep Pitch
95	185	5FB9	Room Drawing Position
95	187	5FBB	Respawn Flag
95	188	5FBC	Pause Flag
95	189	5FBD	Border Colour
95	190	5FBE	Lives Backup
95	193	5FC1	Active Tile Set Pointer
95	195	5FC3	Room Data Pointer
95	197	5FC5	Current Room
95	198	5FC6	Set Room Data Pointer
95	231	5FE7	Raise Table Error
95	233	5FE9	Main Game Loop
98	128	6280	Move Percy Left
98	162	62A2	Move Percy Right
98	194	62C2	Move Percy Up
98	208	62D0	Move Percy Down
98	216	62D8	Update Movement Speed
99	7	6307	Transition Room Right
99	31	631F	Transition Room Left
99	56	6338	Update Percy Animation
99	187	63BB	Print HUD Header
99	233	63E9	Messaging: Header
100	56	6438	Draw Room Rows
100	86	6456	Draw Room Row
100	128	6480	Update Energy Bar
100	231	64E7	Lose Life
101	61	653D	Initialise Lives
101	92	655C	Start Level
101	129	6581	Print Character
101	155	659B	Main Menu
101	234	65EA	Draw Chicks In The Nest
102	13	660D	Messaging: Press ENTER to Start
102	33	6621	Print String
102	43	662B	Handler: Worm Collection and Delivery
102	131	6683	Handler: Draw Worm Animation Frame
102	168	66A8	Handler: Worm Found
102	225	66E1	Percy Carrying Worm
103	156	679C	Drop Worm
103	178	67B2	Add To Score
104	17	6811	Print Score
104	37	6825	Current Score
104	44	682C	Score Buffer
104	50	6832	Animate Snapdragons
104	159	689F	Table: Snapdragon Definition
104	184	68B8	Handle Level Complete
104	247	68F7	Set Up Next Level
105	59	693B	Level Complete Sound Step
105	97	6961	Table: Worm Collection Count
105	102	6966	Pause Border Effect
105	146	6992	Run Game Frame
105	167	69A7	Run Main Loop Body
105	247	69F7	Handler: Red Bird
106	246	6AF6	Update Red Bird Movement
107	200	6BC8	8-Direction Movement Jump Table
108	12	6C0C	Validate Position
108	57	6C39	Generate Random Number
108	83	6C53	Check Sprite Collision
108	133	6C85	Check Egg Collision
108	165	6CA5	Reset Red Bird
108	178	6CB2	Red Bird Direction Change Timer
108	179	6CB3	Red Bird Traversal Direction
108	180	6CB4	Red Bird Stun Timer
108	181	6CB5	Red Bird Stun Timer Copy
108	182	6CB6	Red Bird Current Room
108	183	6CB7	Red Bird Animation Seed
108	184	6CB8	Red Bird Movement Direction
108	185	6CB9	Red Bird Flight Speed
108	186	6CBA	Red Bird Path Counter
108	187	6CBB	Pointer: Red Bird Flightpath Data
108	189	6CBD	Red Bird Appearance Delay
108	190	6CBE	Red Bird Speed Table
108	195	6CC3	Lives Display Previous
108	196	6CC4	Red Bird Wing Animation Counter
108	197	6CC5	Butterfly Movement Boundary
108	198	6CC6	Butterfly Room Table
108	220	6CDC	Butterfly Wing Flap Toggle
108	221	6CDD	Butterfly Movement Delay
108	222	6CDE	Butterfly Direction
108	223	6CDF	Handle Butterfly
109	144	6D90	Randomise Butterfly Position
109	158	6D9E	Reset Butterfly Collected Flags
109	171	6DAB	Handler: Cars
110	47	6E2F	Randomise Car Position
110	93	6E5D	Handler: Car Type 1 (Driving Right)
111	19	6F13	Initialise Car
111	84	6F54	Check Car Egg Collision
111	141	6F8D	Handler: Car Type 2 (Driving Left)
112	40	7028	Handler: Car Type 3 (Driving Left, Fixed Speed)
112	130	7082	Handler: Frogs
112	219	70DB	Update Frog
113	144	7190	Handler: Frogs Check Egg Collision
113	225	71E1	Cancel Egg Drop
113	233	71E9	Frog 1 State Data
113	236	71EC	Frog 2 State Data
113	239	71EF	Table: Frog Jump Height
114	8	7208	Car State Data
114	15	720F	Room Handler Dispatch
114	63	723F	Handler: Room 01
114	101	7265	Handler: Room 02
114	134	7286	Handler: Room 03
114	189	72BD	Handler: Room 04
114	225	72E1	Handler: Room 05
115	14	730E	Handler: Room 06
115	103	7367	Handler: Room 07
115	164	73A4	Handler: Room 08
115	225	73E1	Handler: Room 09
115	250	73FA	Handler: Room 0A
116	19	7413	Handler: Room 0B
116	57	7439	Handler: Helicopter
116	167	74A7	Randomise Helicopter Position
116	185	74B9	Animate Stunned Hazard
116	214	74D6	Check Hazard Collision
117	7	7507	Helicopter Movement Boundary
117	8	7508	Helicopter State Data
117	18	7512	Handler: Cat
117	116	7574	Reset Cat Position
117	136	7588	Cat Direction Data
117	139	758B	Handler: Dog
117	151	7597	Dog Direction Data
117	154	759A	Handler: UFO
118	40	7628	Reset UFO Position
118	51	7633	UFO Abduct Percy
118	121	7679	UFO State Data
118	128	7680	Handler: Plane
118	140	768C	Handle Plane
119	19	7713	Handle Plane Bomb
119	174	77AE	Bomb Explosion Counter
119	175	77AF	Plane State Data
119	179	77B3	Plane Speed
119	180	77B4	Initialise Parachute X Position
119	185	77B9	Handler: Balloon
120	145	7891	Balloon Direction Flag
120	146	7892	Balloon Pop Counter
120	147	7893	Handler: Walking Paratrooper
121	36	7924	Paratrooper Data
121	40	7928	Table: Paratrooper Walking Speed
121	48	7930	Generate Random Number
121	74	794A	Handler: Spider
121	192	79C0	Initialise Spider
121	209	79D1	Spider Direction Flag
121	210	79D2	Handler: Parachute Descent
122	195	7AC3	Parachute State Data
122	199	7AC7	Random Seed
122	200	7AC8	Cat State Data
122	232	7AE8	Dog State Data
123	4	7B04	Table: Parachute Starting X Positions
123	13	7B0D	Paratrooper State Data
123	45	7B2D	Unused
123	46	7B2E	Jump Table: Room Handlers
123	68	7B44	Unused
131	169	83A9	Room 01
132	180	84B4	Room 02
135	87	8757	Room 03
137	127	897F	Room 04
139	7	8B07	Room 05
140	88	8C58	Room 06
142	16	8E10	Room 07
143	99	8F63	Room 08
145	120	9178	Room 09
147	85	9355	Room 0A
148	90	945A	Room 0B
149	165	95A5	Room 0C: Title Screen
151	71	9747	Room 0D: Level 2
151	218	97DA	Room 0E: Level 3
152	111	986F	Room 0F: Level 4
153	4	9904	Room 10: Level 5
153	152	9998	Unused
155	170	9BAA	Graphics: Default Tile Set
163	106	A36A	Graphics: Alternate Tile Set
167	99	A763	Graphics: Chick Frames
167	115	A773	Graphics: Mayfly Frames
167	147	A793	Graphics: Butterfly Frames
167	179	A7B3	Graphics: Worm
167	211	A7D3	Graphics: Egg
167	251	A7FB	Graphics: Bomb
168	3	A803	Unused
171	59	AB3B	Graphics: Sprite Sheet
183	59	B73B	Unused
187	28	BB1C	Draw Sprites and Merge Collision Map
188	14	BC0E	Calculate Screen Buffer Address
188	55	BC37	Adjust Screen Address at Row Boundary
188	82	BC52	Apply Sprite Attributes (3-Wide)
188	116	BC74	Write Attribute Block (3-Wide)
188	244	BCF4	Unused
188	247	BCF7	Apply Sprite Attributes (2-Wide)
189	25	BD19	Write Attribute Block (2-Wide)
189	94	BD5E	Draw 3-Wide Sprite Column
189	166	BDA6	Draw 2-Wide Sprite Column
189	228	BDE4	Sprite Inactive Delay
189	248	BDF8	Unused
190	0	BE00	Table: Red Bird Flight Path Data
190	147	BE93	Unused
190	148	BE94	Unused: Draw 2-Wide Sprite With Attributes
190	178	BEB2	Unused: Draw 1-Wide Sprite With Attributes
190	202	BECA	Unused: Apply Sprite Attributes
190	224	BEE0	Unused: Write Sprite Attribute Cells
191	37	BF25	Unused: Fragment
191	44	BF2C	Unused: Copy 8 Bytes
191	53	BF35	Unused: Draw 3-Wide Sprite With Attributes
191	135	BF87	Unused: Apply 3-Wide Sprite Attributes
191	148	BF94	Unused: Write 3-Wide Attribute Cells
191	217	BFD9	Unused: Fragment 2
191	229	BFE5	Unused
192	0	C000	Room Buffer
218	192	DAC0	Percy States
218	196	DAC4	3-Wide Sprite 1 Data States
218	200	DAC8	3-Wide Sprite 2 Data States
218	204	DACC	3-Wide Sprite 3 Data States
218	208	DAD0	3-Wide Sprite 4 Data States
218	212	DAD4	3-Wide Sprite 5 Data States
218	216	DAD8	3-Wide Sprite 6 Data States
218	220	DADC	3-Wide Sprite 7 Data States
218	224	DAE0	Egg Sprite Data
218	228	DAE4	Butterfly Sprite Data
218	232	DAE8	2-Wide Sprite 1 Data States
218	236	DAEC	2-Wide Sprite 2 Data States
218	240	DAF0	2-Wide Sprite 3 Data States
218	244	DAF4	2-Wide Sprite 4 Data States
218	248	DAF8	2-Wide Sprite 5 Data States
218	252	DAFC	2-Wide Sprite 6 Data States
219	0	DB00	Backup: Percy
219	4	DB04	Backup: 3-Wide Sprite 1
219	8	DB08	Backup: 3-Wide Sprite 2
219	12	DB0C	Backup: 3-Wide Sprite 3
219	16	DB10	Backup: 3-Wide Sprite 4
219	20	DB14	Backup: 3-Wide Sprite 5
219	24	DB18	Backup: 3-Wide Sprite 6
219	28	DB1C	Backup: 3-Wide Sprite 7
219	32	DB20	Backup: Egg
219	36	DB24	Unused
219	40	DB28	Backup: 2-Wide Sprite 1
219	44	DB2C	Backup: 2-Wide Sprite 2
219	48	DB30	Backup: 2-Wide Sprite 3
219	52	DB34	Backup: 2-Wide Sprite 4
219	56	DB38	Backup: 2-Wide Sprite 5
219	60	DB3C	Backup: 2-Wide Sprite 6
219	64	DB40	Unused
222	158	DE9E	Room Object Data
224	0	E000	Sprite Buffer
248	0	F800	Overlay Buffer
250	193	FAC1	Play Next Level Jingle
250	249	FAF9	Audio: Next Level Jingle
252	27	FC1B	Print Author Byline
252	46	FC2E	Print Message
252	61	FC3D	Messaging: Author Byline
252	82	FC52	Print High Score
252	153	FC99	Messaging: High Score
252	166	FCA6	High Score
255	88	FF58	Graphics: Custom UDGs