Through the Trap Door: Memory map

The blocks listed here were generated from a snapshot taken after execution of initialisation code. The PC register holds a value of 34438.

Page	Byte	Address	Description
15	18	03858	Graphics: Set 01 (ROM data)
91	0	23296	Unused
105	120	27000	Table of graphic sets' start addresses
105	146	27026	Unused
105	150	27030	Bitmap data mirror image lookup table
106	150	27286	Graphics: Set 03
108	142	27790	Graphics: Set 05
109	174	28078	Graphics: Set 04
110	214	28374	Graphics: Set 07
112	174	28846	Graphics: Set 06
114	174	29358	Graphics: Set 09
116	30	29726	Graphics: Set 08
117	46	29998	Graphics: Set 10
119	206	30670	Graphics: Set 11
122	22	31254	Graphics: Set 12
126	86	32342	Graphics: Set 02
133	54	34102	Unused
133	159	34207	Index of current level
133	160	34208	Game flags
133	161	34209	Cannon's (level 4) ammunition counter
133	162	34210	Current time / lives
133	163	34211	Score data
133	169	34217	Current border colour
133	170	34218	Index of current character's current room
133	171	34219	Control input bitmap
133	172	34220	Berk's current power
133	173	34221	Interaction data for Berk
133	176	34224	Remaining duration of Berk's current power
133	178	34226	Attribute of current character
133	179	34227	Timer figure blink duration counter
133	180	34228	Data for clawed foot (level 3)
133	182	34230	Temporary store for room dimension data
133	187	34235	Temporary store for width of entity's current room
133	188	34236	Table of data addresses (current level)
133	208	34256	Miscellaneous data 1
133	228	34276	Unused
133	229	34277	Position (address) in script data currently running
133	231	34279	Data for drawing to display
133	235	34283	Unused
133	237	34285	Store for script instruction loop data
133	246	34294	Store for graphic layout loop data
133	250	34298	Joystick-mode flag
133	251	34299	Current high score
133	253	34301	Table of data addresses (level 1)
134	17	34321	Table of data addresses (level 2)
134	37	34341	Table of data addresses (level 3)
134	57	34361	Table of data addresses (level 4)
134	77	34381	Unused / stack
134	122	34426	Unused
134	134	34438	Display main menu and handle main game loop
135	115	34675	Pause
135	127	34687	Table of start addresses of levels' state data for complex entities
135	135	34695	Copy state data for all resettable complex entities into table of initial-state data for complex entities
135	191	34751	Reset all game data in preparation for new game
136	48	34864	Copy start addresses of current level's data blocks and clean up old data
136	85	34901	Script routine: (48, 49) Return
136	86	34902	Unused routine
136	100	34916	If fire pressed, or character-swap-pending flag set, then swap characters
136	161	34977	Script data: Berk turning to face left
136	181	34997	Script data: Berk turning to face right
136	201	35017	Script data: Berk interacting with a door behind him
136	229	35045	Script data: Berk interacting with a door in front of him
137	1	35073	Script data: Berk turning (facing into screen to facing out of screen)
137	33	35105	Script data: Berk turning (facing out of screen to facing into screen)
137	63	35135	Script data: Berk picking up an entity on floor behind him
137	77	35149	Script data: Berk picking up an entity above and behind him
137	91	35163	Script data: Berk picking up an entity that is above floor and below Berk's top edge and behind him
137	115	35187	Script data: Berk picking up an entity on floor in front of him
137	133	35205	Script data: Berk putting an entity down on floor in front of him
137	147	35219	Script data: Berk putting an entity down on floor behind him
137	163	35235	Script data: Berk putting an entity down above floor behind him
137	179	35251	Script data: Berk starting to walk right
137	191	35263	Script data: Berk starting to walk left
137	203	35275	Script data: Berk's power expiring
137	211	35283	Script data: Berk banging head (while jumping)
137	219	35291	Script data: Berk starting to fall to the left
137	255	35327	Script data: Berk starting to fall to the right
138	89	35417	Script data: Berk starting to fly
138	113	35441	Script data: Berk jumping
138	165	35493	Script data: Berk eating an entity
138	187	35515	Script data: Berk gaining floating power
138	195	35523	Script data: Berk being thrown left by hatch (level 3)
138	249	35577	Change direction Berk is facing depending upon relative position of Drutt
139	103	35687	Current position in Berk's script data
139	105	35689	Update state of Berk and store current position in script data
139	151	35735	Update state of Berk depending upon currently selected character, control input and currently active power
140	168	36008	Make Berk eat the entity he is holding, if edible, and exit calling routine
140	196	36036	Update state of Berk (forward pressed)
141	20	36116	If Berk is not horizontally aligned with entity at IY then move Berk closer and exit calling routine
141	200	36296	Make Berk drop the entity he is holding and load IY with its complex state data address
142	15	36367	If Berk is neither facing into the screen nor walking then exit calling routine and have Berk turn into screen
142	33	36385	Script routine: (59) Have Berk interact appropriately with a door behind him
142	38	36390	Script routine: (58) Have Berk interact appropriately with a door in front of him
142	119	36471	Script routine: (56) Give Berk power corresponding to entity eaten
142	190	36542	Update state of Berk (floating power active)
143	2	36610	Script routine: (57) Cycle attributes (full-screen), clear display buffers and paint red areas outside current room
143	8	36616	Cycle attributes (full-screen), clear display buffers and paint red areas outside current room
143	17	36625	State data for Drutt upon returning to level 1
143	30	36638	Advance to next level and if back to level 1 then exit calling routine and make Berk start falling
143	145	36753	Set Berk's horizontal position to match level 1's entry door
143	170	36778	Initialise script data positions for flying skeleton creature and bat (level 1)
143	183	36791	Update states of all level 1 entities
143	193	36801	Current position in script data for Boni's kidnap
143	195	36803	Script data: Boni's kidnap
144	23	36887	Execute script data for Boni's kidnap and handle Trap Door opening and closing
144	57	36921	Open Trap Door if Berk is near the left side of the Trap Door room
144	83	36947	Advance HL to next script instruction and start executing
144	86	36950	Script routine: (36) Remove Boni from level 1
144	93	36957	Script routine: (37) Remove flying skeleton creature from level 1, and terminate script processing
144	102	36966	Close the Trap Door if Berk is not in room 1 and Drutt is in room 4 (level 1)
144	120	36984	Script routine: (38) Close the Trap Door
144	126	36990	Script routine: (39) Open the Trap Door
144	132	36996	Close the Trap Door
144	140	37004	Open the Trap Door
144	152	37016	Current position in bat's script data
144	154	37018	Script data: Bat (level 1)
144	198	37062	Update state of bat (level 1) and store current position in script data
144	221	37085	Update state of bat (level 1)
145	85	37205	Graphic layout data: Bat (level 1)
146	204	37580	Table of current positions in spiders' script data
146	210	37586	Update the states of the spiders (level 1) and store current positions in script data
147	7	37639	Update the state of a spider (level 1)
147	86	37718	Script routine: (41) Move spider up one character and, if home, reset its timer and make it wait
147	121	37753	Script routine: (42) Decrease remaining time until spider next descends and if zero, start descent
147	146	37778	Script routine: (40) Move spider down one character, and if at bottom, advance it to bounce / climb up mode
147	160	37792	Script data: Spiders (level 1)
147	240	37872	Graphic layout data: Spiders (level 1)
148	121	38009	Update states of all level 2 entities
148	134	38022	Current position in Bubo's script data
148	136	38024	Script data: Bubo
148	166	38054	Update state of Bubo (level 2) and store current position in script data
148	186	38074	Update state of Bubo
149	21	38165	Script routine: (61) Fire Bubo's projectile
149	75	38219	Update state of Bubo's projectile
149	233	38377	Start level 2 key falling if Bubo's projectile is in place below it
150	16	38416	Table of initial positions in ape-beasts' script data
150	24	38424	Table of current positions in ape-beasts' script data
150	32	38432	Script data: Ape-beast walking right
150	50	38450	Script data: Ape-beast walking left
150	68	38468	Reset current positions in ape-beasts' script data to initial values
150	80	38480	Update states of ape-beasts (level 2) and store current positions in script data
150	140	38540	Update state of an ape-beast
150	154	38554	Script routine: (60) Check position of ape-beast and turn if appropriate
150	192	38592	Update states of stalactites (level 2)
151	100	38756	Move entity at IX down one character
151	110	38766	Graphic layout data: Ape-beast (level 2)
152	84	38996	Graphic layout data: Bubo (level 2)
152	219	39131	Graphic layout data: Bubo's projectile (level 2)
152	225	39137	Update states of all level 3 entities
152	238	39150	Hatch state index (level 3)
152	239	39151	Update state of hatch (level 3)
153	110	39278	Update state of clawed foot (level 3)
154	160	39584	Table of coloured creatures' properties
154	175	39599	Miscellaneous data (coloured creatures)
154	177	39601	Update states of coloured creatures
155	19	39699	Count coloured creatures in slots and return if all are home
155	80	39760	Present reward for getting coloured creatures home
155	96	39776	Update state of large yellow creature (level 3)
155	253	39933	Unused routine
155	254	39934	Set large yellow creature's mode to "returning home", and set Berk-has-been-killed flag
156	8	39944	Set graphic layout data address for entity at IY to BC
156	15	39951	Move entity at IY down two characters
156	25	39961	Move entity at IY up two characters
156	35	39971	Move entity IY such that its left edge is up to two characters closer to entity IX's
156	62	39998	Set large yellow creature's mode to "returning home", move one step closer to home and return
156	72	40008	Move entity at IY one step closer to home position
156	104	40040	Graphic layout data: Architecture (level 3)
157	0	40192	Graphic layout data: Edible eyes (level 3)
157	62	40254	Graphic layout data: Coloured creatures (level 3)
157	128	40320	Graphic layout data: Clawed foot (level 3)
157	250	40442	Graphic layout data: Large yellow creature (level 3)
160	130	41090	Graphic layout data: Hatch (level 3)
160	215	41175	Graphic layout data: Weight (level 3)
160	251	41211	Update states of all level 4 entities
161	14	41230	Current position in skeleton's script data
161	16	41232	Script data: Skeleton (level 4) idling
161	24	41240	Unused
161	64	41280	Script data: Skeleton (level 4) stepping forward (left)
161	102	41318	Script data: Skeleton (level 4) stepping back (right)
161	138	41354	Reset skeleton to initial state
161	165	41381	Update state of skeleton (level 4) and store current position in script data
161	196	41412	Table of addresses of attribute data in skeleton's graphic layout data blocks
161	208	41424	Update state of skeleton (dying)
162	26	41498	Kill Berk if he collides with skeleton
162	78	41550	Script routine: (63) Have skeleton advance or retreat based upon positions of Berk and yellow skull
162	145	41617	Script routine: (64) Set random (1 to 10) number of iterations in following loop script instruction
162	161	41633	Update state of ghost
163	39	41767	Update state of cannon and projectile
163	233	41961	Update state of cannon's projectile
164	80	42064	Update states of drips (level 4)
164	249	42233	Addresses of graphic layout data for drips (level 4)
165	11	42251	Set a drip's (level 4) stage to A
165	26	42266	Update state of flying skeleton creature (level 4)
165	141	42381	Update state of snake (level 4)
165	246	42486	Open snake's mouth and set Berk-has-been-killed flag if snake and Berk have collided
166	9	42505	Move entity at IX right one character
166	16	42512	Set graphic layout data address for entity at IX to BC
166	23	42519	Graphic layout data: Cannon (level 4)
166	152	42648	Graphic layout data: Snake (level 4)
167	2	42754	Graphic layout data: Ghost (level 4)
167	149	42901	Graphic layout data: Skeleton (level 4)
168	120	43128	Graphic layout data: Sausages (level 4)
168	138	43146	State data for simple entities (level 1)
169	69	43333	State data for complex entities (level 1)
171	39	43815	Room dimension data (level 1)
171	95	43871	Horizontal room connectivity map (level 1)
171	105	43881	Unused
171	106	43882	Vertical room connectivity map (level 1)
171	120	43896	State data for simple entities (level 2)
171	217	43993	State data for complex entities (level 2)
173	148	44436	Room dimension data (level 2)
173	184	44472	Horizontal room connectivity map (level 2)
173	194	44482	Unused
173	195	44483	Vertical room connectivity map (level 2)
173	199	44487	State data for simple entities (level 3)
174	64	44608	State data for complex entities (level 3)
176	60	45116	Room dimension data (level 3)
176	96	45152	Horizontal room connectivity map (level 3)
176	108	45164	Unused
176	109	45165	Vertical room connectivity map (level 3)
176	115	45171	State data for simple entities (level 4)
176	218	45274	State data for complex entities (level 4)
179	36	45860	Room dimension data (level 4)
179	62	45886	Horizontal room connectivity map (level 4)
179	70	45894	Unused
179	71	45895	Vertical room connectivity map (level 4)
179	75	45899	Populate primary display buffer with layout data for current character's current room
179	141	45965	Populate primary display buffer with graphic layout data for entity whose simple / complex state data is at address in IX
179	175	45999	Advance graphic layout data pointer by two bytes, and process data
180	90	46170	Table of multiples of 96
180	138	46218	Jump to appropriate graphic layout routine
180	164	46244	Table of addresses of graphic layout data handling routines
180	204	46284	Graphic layout routine: (237) Set new pending sound
180	215	46295	Graphic layout routine: (242) Set current attribute
180	226	46306	Graphic layout routine: (244) Set current graphic set index
180	237	46317	Graphic layout routine: (236) Set graphic index in next instruction to value randomly selected from list
181	11	46347	Graphic layout routine: (245) Decrease timer value, and if zero, reset and write random graphic index from list into next instruction
181	27	46363	Graphic layout routine: (246) Decrease timer value, and if zero, reset and write random attribute from list into next instruction
181	49	46385	Reset timer to initial value then load E with random value from sequence (in graphic layout data)
181	82	46418	Graphic layout routine: (255) Load HL with stored coordinates and return from drawing
181	91	46427	Graphic layout routine: (250) Adjust x- and y-coordinates for drawing without storing
181	106	46442	Graphic layout routine: (254) Adjust x- and y-coordinates for drawing and set as new base coordinates
181	124	46460	Graphic layout routine: (251) Process graphic layout data at following address and return when complete
181	145	46481	Graphic layout routine: (248) Jump to graphic layout data address
181	159	46495	Graphic layout routine: (249) Jump to time-weighted, randomly selected graphic layout data address in list
181	223	46559	Graphic layout routine: (243) Increment index, n, and jump to n-th address in following list
181	241	46577	Graphic layout routine: (247) Jump to randomly selected graphic layout data address from list
182	2	46594	Graphic layout routine: (253) Jump to graphic layout data address selected from list, based upon width of Berk's carried entity
182	7	46599	Unused routine
182	19	46611	Graphic layout routine: (238) Start loop (1 / 2)
182	36	46628	Graphic layout routine: (239) End loop (1 / 2)
182	55	46647	Graphic layout routine: (240) Start loop (2 / 2)
182	72	46664	Graphic layout routine: (241) End loop (2 / 2)
182	91	46683	Current keyboard controls
182	98	46690	Table of attribute file addresses for main menu strings
182	118	46710	Table of main menu strings
182	238	46830	Display and handle main menu
183	98	46946	Draw joystick "J" (main menu) in colour depending upon joystick mode
183	120	46968	If "K" pressed then redefine controls
183	195	47043	Set carry flag if Kempston interface not present, or Kempston joystick moved / fire pressed
183	212	47060	Set zero flag if key whose index is in A matches a direction, or the Berk / Drutt key
183	223	47071	Set attribute and location and print double-height character in E
183	236	47084	Print keyboard controls on main menu
184	16	47120	"THROUGH the TRAPDOOR" string
184	36	47140	Print "THROUGH the TRAPDOOR" string
184	49	47153	"SORRY BERK, BUT YOUR TIME IS UP" string
184	81	47185	Print "SORRY BERK, BUT YOUR TIME IS UP" string
184	94	47198	"HOME SWEET HOME" string
184	109	47213	Print "HOME SWEET HOME" string
184	137	47241	Reset show-score flag and draw timer figures bar
184	198	47302	If show-score flag reset then draw pair of timer figure eyes (closed) at attribute file address IX and advance IX by two bytes
184	211	47315	If show-score flag reset then draw pair of timer figure eyes (open, random frame) at attribute file address IX and advance IX by two bytes
184	219	47323	Draw a timer figure's eye (random frame) at attribute file address in IX and advance IX by one byte
184	251	47355	If show-score flag is reset then return to calling routine, else return to routine that called calling routine
185	3	47363	Update eyes of a randomly selected timer figure, increase timer tick counter and process timer figure blinking
185	71	47431	Select a remaining timer figure at random and update its eyes to a random (open-eyed) frame
185	108	47468	Increase timer tick counter and reduce remaining time if counter > 767
185	139	47499	Update scores and display
185	229	47589	Score / total / high score string
186	12	47628	Print score / total / high score string in current character's colours
186	66	47682	Print a double-height text character
186	93	47709	Print half of a double-height text character
186	125	47741	Convert number in HL to string at IY
186	156	47772	Convert a digit of numeric data to its string equivalent
186	172	47788	Read keyboard and load pressed key character into A
186	237	47853	Return values from keyboard reading routine
187	21	47893	Check for control key press and store
187	58	47930	If joystick mode is on, then read joystick input
187	70	47942	Wait for current key to be released and another to be pressed, storing in A
187	83	47955	Wait for key-press, store pressed key code in A and play main menu sound
187	94	47966	Table of addresses of script handling routines
187	224	48096	Advance HL to next script instruction and execute
188	5	48133	Script routine: (04) If current character and target entity are in the same room then set pending sound
188	14	48142	Script routine: (62) Move entity at IX into room to the left, if appropriate
188	20	48148	Script routine: (16) Have Berk hold an entity, and position it appropriately between his hands
188	26	48154	Script routine: (17) Have Berk put down an entity in front of him, if appropriate
188	30	48158	Script routine: (18) Have Berk put down an entity behind him, if appropriate
188	84	48212	Script routine: (10) Reset walking-left and walking-right flags
188	88	48216	Script routine: (12) Reset walking-left flag and set walking-right flag
188	92	48220	Script routine: (11) Set walking-left flag and reset walking-right flag
188	106	48234	Script routine: (07) Reset Berk's facing-into-screen, facing-left and facing-right flags
188	110	48238	Script routine: (06) Set Berk's facing-into-screen flag, and reset his facing-left and facing-right flags
188	114	48242	Script routine: (13) Set Berk's facing-left flag, and reset his facing-into-screen and facing-right flags
188	118	48246	Script routine: (14) Set Berk's facing-right flag, and reset his facing-into-screen and facing-left flags
188	132	48260	Script routine: (09) Reset must-process-current-script-data flag for entity at IX
188	139	48267	Script routine: (08) Set must-process-current-script-data flag for entity at IX
188	146	48274	Script routine: (15) Jump to new address if Berk is carrying something
188	157	48285	Script routine: (01) Load HL (script data pointer) with new address
188	167	48295	Script routine: (23) Start loop (1 / 3)
188	179	48307	Script routine: (24) End loop (1 / 3)
188	196	48324	Script routine: (25) Start loop (2 / 3)
188	208	48336	Script routine: (26) End loop (2 / 3)
188	225	48353	Script routine: (27) Start loop (3 / 3)
188	237	48365	Script routine: (28) End loop (3 / 3)
188	254	48382	Load A with script instruction parameter then advance HL to next instruction
189	4	48388	Decrease remaining time for current power and if zero, exit calling routine and run script data for removal of power
189	33	48417	Remove Berk's current power and reset sweet / mushroom / edible eyes / sausage to its original position
189	103	48487	Script routine: (32) Update Berk's position and state (flying) depending upon control input
189	183	48567	Script routine: (35) Move entity at IX (and any carried entities) down one character
189	209	48593	Move entity right one character, and into new room if appropriate
190	1	48641	Move entity left one character, and into new room if appropriate
190	46	48686	Script routine: (22) Move carried entity behind Berk as he faces into screen
190	52	48692	Script routine: (21) Move carried entity in front of Berk as he faces out of screen
190	58	48698	Script routine: (19) Move carried entity to Berk's left as he faces left
190	64	48704	Script routine: (20) Move carried entity to Berk's right as he faces right
190	70	48710	Move carried entity in front of Berk as he faces out of screen
190	75	48715	Move carried entity behind Berk as he faces into screen
190	87	48727	Move carried entity to Berk's right as he faces right
190	98	48738	Move carried entity to Berk's left as he faces left
190	120	48760	Load A, D and E with positional data for a carried entity or return
190	151	48791	Unused routine
190	210	48850	Have Berk hold an entity, and position it appropriately between his hands
191	24	48920	Script routine: (29) Make Berk start falling, and drop his carried entity if appropriate
191	38	48934	Script routine: (30) Check Berk's fall velocity, and react to landing
191	80	48976	Script routine: (31) React to Berk's landing
191	98	48994	Table of addresses of Berk's jump script data
191	114	49010	Script routine: (33) Advance Berk's jump and select next phase if current phase complete
191	133	49029	Graphic layout data: Architecture (level 4)
194	41	49705	Graphic layout data: Architecture (level 3)
195	88	50008	Graphic layout data: Architecture (level 1), part 1
196	128	50304	Graphic layout data: Boni
196	183	50359	Graphic layout data: Architecture (level 1), part 2
197	128	50560	Graphic layout data: Sweets (level 1)
197	147	50579	Graphic layout data: Architecture (level 1), part 3
197	231	50663	Graphic layout data: Doors
198	104	50792	Graphic layout data: Miscellaneous, part 2
198	113	50801	Graphic layout data: Architecture (level 2)
200	71	51271	Graphic layout data: Mushroom
200	86	51286	Graphic layout data: Flying skeleton creature
201	27	51483	Graphic layout data: Explosion (Bubo's projectile, fallen drips and firing cannon, level 4)
201	62	51518	Current position in Drutt's script data
201	64	51520	Script data: Drutt facing out of screen (falling)
201	68	51524	Script data: Drutt facing out of screen
201	82	51538	Script data: Move Drutt and any pushed entity right by a hop of size four
201	106	51562	Script data: Move Drutt and any pushed entity right by a hop of size three
201	128	51584	Script data: Move Drutt and any pushed entity left by a hop of size four
201	152	51608	Script data: Move Drutt and any pushed entity left by a hop of size three
201	174	51630	Script data: Drutt swapping depth levels
201	218	51674	Script data: Drutt jumping
201	250	51706	Script data: Drutt eating a worm
202	20	51732	Reset Drutt to initial state
202	27	51739	Update states of Drutt and worm and store current positions in script data
202	53	51765	Update state of Drutt
202	67	51779	Script routine: (43) Select next action for Drutt depending upon control input
202	178	51890	Table of addresses of script data for Drutt's actions
202	192	51904	Randomly select script data for rightward hop of size three or four, and execute
202	212	51924	Randomly select script data for leftward hop of size three or four, and execute
202	232	51944	Start Drutt jumping
202	242	51954	Point HL at script data for Drutt swapping depth levels and execute
202	248	51960	Move Drutt closer to the worm and eat it if close enough
203	61	52029	Script routine: (44) Move entity up one character
203	70	52038	Script routine: (45) Move entity down one character
203	79	52047	Script routine: (46) Move Drutt, or entity he is pushing left one character and start pushed entity falling if appropriate
203	85	52053	Move Drutt, or entity he is pushing left one character and start pushed entity falling if appropriate
203	130	52098	Advance position of entity pushed left by Drutt
203	174	52142	Script routine: (47) Move Drutt, or entity he is pushing right one character and start pushed entity falling if appropriate
203	180	52148	Move Drutt, or entity he is pushing right one character and start pushed entity falling if appropriate
203	225	52193	Advance position of entity pushed right by Drutt
204	19	52243	Script routine: (50) Advance Drutt's jump and select next phase if current phase complete
204	85	52309	Script routine: (51) Swap Drutt's current depth level if possible
204	91	52315	Swap Drutt's current depth level if possible
204	147	52371	Graphic layout data: Drutt
205	246	52726	Current position in worm's script data
205	248	52728	Worm's age
205	249	52729	Script data: Worm
206	101	52837	Update state of worm and store current position in script data
206	124	52860	Update state of worm
206	134	52870	Script routine: (53) Move worm left if possible, otherwise choose new direction
206	153	52889	Script routine: (54) Move worm right if possible, otherwise choose new direction
206	172	52908	Execute script data for worm choosing next direction
206	178	52914	Script routine: (55) Choose new direction and start crawling (worm)
206	231	52967	Script routine: (52) Increase worm's age and decrease time until direction change, or react to Drutt's presence
207	65	53057	Increase worm's age and set its depth to zero if it has expired
207	91	53083	Attempt to spawn a new worm
207	167	53159	Pathfinding data table
207	179	53171	Unused
207	202	53194	Load A with value indicating which direction room A lies relative to room in state data at IX
208	61	53309	Add entry to pathfinding data table for room B in direction A
208	69	53317	Set zero flag if room B has an entry in pathfinding data table, otherwise reset
208	85	53333	Load A with direction index in pathfinding data table entry at address in IX, restore registers and return
208	92	53340	Graphic layout data: Worm
209	73	53577	Cycle attributes (long, full-screen) and clear display buffers
209	77	53581	Cycle attributes (short, full-screen) and clear display buffers
209	145	53649	Fill top 22 rows of attribute file with attribute value in A
209	163	53667	Set Berk-has-been-killed flag
209	172	53676	Table of Berk's reset complex state data addresses
209	180	53684	Berk's reset complex state data
209	219	53723	If Berk has been killed then reset his position and state, flash screen and decrease time / lives
210	22	53782	Set each value in primary display buffer within play area to zero
210	54	53814	Advance DE by 2 × A bytes and load word at this location into DE
210	65	53825	Copy room dimension data entry for current character / entity's current room to temporary store location
210	127	53887	Paint red areas outside accessible areas of current character's current room
210	208	53968	Print red cell to current attribute file position (outside play area) and mark as unused in display buffers
210	227	53987	Reset complex state data for first entity of class A to that stored in initial-state table
211	3	54019	Point IY at first entry in current level's complex state data that has class A
211	18	54034	Draw contents of primary display buffer to display
211	128	54144	Draw a graphic character block to display
211	203	54219	Data for pseudo-random number generator
211	206	54222	Load A with a pseudo-random number between 0 and the higher of 2 and A (input)
212	11	54283	Move entity at IX into new room (left or right) if it is at the edge of its current room
212	41	54313	Move entity at IX into room to the right, if appropriate
212	76	54348	Move entity at IX into room to the left, if appropriate
212	111	54383	Move entity at IX into room to right of its current room and update position of carried entity if moving entity is Berk
212	126	54398	Set entity's position to be left-hand side of new room to right
212	147	54419	Move entity at IX into room to left of its current room and update position of carried entity if moving entity is Berk
212	162	54434	Set entity's position to be right-hand side of new room to left
212	184	54456	Paint red areas outside current character's room if IX points to current character's complex state data
212	208	54480	Set room of entity at IX to B, store room size data for new room and load E with entity's width minus one
212	227	54499	Unused routine
212	233	54505	Load B with index of room to right of an entity's current room
213	5	54533	Unused routine
213	11	54539	Load B with index of room to left of an entity's current room
213	41	54569	Check entity at IX for collision with another (impassable / pushable) entity immediately to the right
213	138	54666	Check entity at IX for collision with another (impassable / pushable) entity immediately to the left
213	236	54764	Check entity at IX for collision with another entity at next depth level out of screen whose interaction-(11,6) flag is set
213	240	54768	Check entity at IX for collision with another entity at same depth whose interaction-(11,6) flag is set
214	94	54878	Check entity at IX for collision with another entity (only those defined before, and in reverse order) at same depth level whose interaction-(11,7) flag is set
214	106	54890	Check entity at IX for collision with another entity (in reverse order) at next depth level into screen whose interaction-(11,7) flag is set
214	218	55002	Unused routine
214	238	55022	Cached control input
214	239	55023	Handle Drutt's jump, and load E with jump state index as appropriate
215	1	55041	Handle Berk's jump, and load E with jump state index as appropriate
215	147	55187	Set character-swap-pending flag
215	156	55196	Handle vertical component of character's jump, and load E with jump state index as appropriate
216	125	55421	Increase current velocity of character's jump if less than 7
216	137	55433	Change entity's room up one if appropriate
216	220	55516	Set can-fall flag and set initial velocity factor of 2 for entity defined at address in IX
216	229	55525	Move all falling entities down by distances appropriate to their current velocity factors
217	64	55616	Change entity's room down one if appropriate
217	146	55698	Graphic layout data: Berk
219	146	56210	Graphic layout data: Berk walking left
221	155	56731	Graphic layout data: Berk facing out of screen
223	250	57338	Graphic layout data: Berk facing into screen
224	201	57545	Graphic layout data: Berk body parts
227	7	58119	Graphic layout data: Berk in action
232	150	59542	Unused
232	151	59543	Unused routine
232	194	59586	Unused
232	209	59601	If current character is in same room as target entity at IX then set pending sound to A
232	242	59634	Table of sound parameters
233	74	59722	Set sound of index A as pending if appropriate, then play and clear pending sound
233	173	59821	Table of initial-state data for complex entities
236	133	60549	Unused
239	128	61312	Display buffer 1
247	192	63424	Display buffer 2