Routines

Address	Label	Description
5E00	ENTRY	Where the BASIC loader enters the game
AF87	START	Start the game
B00C	OBJECT_DONE	One object done; at the end of a turn, draw and wait
B097	QUEST_INTO_ROOM	Put the quest things in this room into the object records
B115	QUEST_OUT_OF_ROOM	Copy the quest things in the room back to their records
B145	SHOW_SCORE	Copy the score to the screen
B178	SHOW_BUFFER	Copy the screen buffer to the screen
B19E	RENDER_DYNAMIC_OBJECTS	Redraw what changed and copy it to the screen
B278	BLIT_TO_SCREEN	Copy a rectangle of the buffer to the screen
B29A	MAKE_TABLES	Build the drawing tables
B2C5	CALC_PIXEL_XY	Project an object's position onto the screen
B2EE	FIND_SPRITE	Find an object's sprite, and turn it the way the object faces
B37F	CALC_VIDBUF_ADDR	Buffer address of a pixel position
B394	CALC_VRAM_ADDR	Display address of a pixel position
B3B6	CALC_ATTRIB_ADDR	Attribute address of a pixel position
B3D3	DRAW_OBJECT	Draw one object from the draw list
B44F	SPRITE_ALIGNED_RUN	The unrolled row of a byte-aligned sprite
B479	SPRITE_ROW	Start a row of a sprite
B47D	SPRITE_SHIFTED_RUN	The unrolled row of a shifted sprite
B4E0	PAUSE	Pause, when SPACE or CAPS SHIFT is pressed on its own
B513	CLEAR_BYTES	Clear B bytes from DE
B519	ADD_HL_A	HL = HL + A
B520	RECORD_OF	HL = the address of the object record numbered A
B531	LIST_DRAWN	List the objects to be drawn
B58A	SORT_AND_DRAW	Draw the listed objects, back to front
B66E	ORDER_UNCONSTRAINED	A pair with no order between them
B671	CANDIDATE_ALREADY_FIRST	The candidate is behind the other object
B674	IY_GOES_FIRST	The other object must be drawn first
B6B0	BOXES_INTERSECT	Two boxes occupy the same space
B6B3	DRAW_CANDIDATE	Draw the candidate and start the next pass
B6C8	ALL_DRAWN	All the listed objects are drawn
B6DD	FILL_RECT	Fill a rectangle of bytes with A
B6ED	ADJ_FOR_OUT_OF_BOUNDS	Cut a move short against the room and the other objects
B742	ADJ_DU_FOR_OBJ_INTERSECT	Shorten dU against the other objects
B791	ADJ_DV_FOR_OBJ_INTERSECT	Shorten dV against the other objects
B7E0	ADJ_DZ_FOR_OBJ_INTERSECT	Shorten dZ against the other objects
B866	CONVEYOR_PUSH	Be carried along by a block of graphic 140-143
B890	MARK_STOOD_ON	Mark the obstacle, if the mover is the player's legs or graphic 91
B8A2	DO_OBJS_INTERSECT_ON_U	Do two objects overlap in U?
B8B7	DO_OBJS_INTERSECT_ON_V	Do two objects overlap in V?
B8CC	DO_OBJS_INTERSECT_ON_Z	Do two objects overlap in Z?
B8E2	ADJ_DU_FOR_OUT_OF_BOUNDS	Shorten dU at the walls
B90D	ADJ_DV_FOR_OUT_OF_BOUNDS	Shorten dV at the walls
B938	CALC_2D_INFO	Work out an object's screen rectangle
B952	READ_KEYS	Read a half-row of the keyboard
B95A	SHORTEN_DELTA	Shorten a move by one unit
B963	ADJ_DZ_FOR_OUT_OF_BOUNDS	Shorten dZ at the floor
B979	DEC_DZ_AND_UPDATE_UVZ	Fall, and move
B99B	IS_OBJECT_NOT_IGNORED	Does this object take part in collisions?
B9A7	SET_DRAW_OBJS_OVERLAPPED	Mark every object the moving object's old or new rectangle touches
BA34	SHOW_CARRIED	Show the carried things on the panel, if they have changed
BAEA	PRINT_CHAR	Print a character into the screen buffer
BB14	PRINT_SCORE	Print the score, with its heading, on the panel
BB29	ADD_SCORE	Add BC to the score, in BCD, and print it
BB64	TOGGLE_SELECTED	Flash one of B attributes, and steady the rest
BB6B	FLASH_NEXT_ONE	The rest of TOGGLE_SELECTED
BB74	MENU	The menu
BBD8	FLASH_MENU	Flash the chosen control method's line on the menu
BC66	PRINT_TEXT_SINGLE_COLOUR	Print a string in one colour
BC8B	TEXT_ATTR_ADDR	Find the string's first attribute cell, and print the string
BCB4	DISPLAY_MENU	Draw the menu
BCE5	DISPLAY_PANEL	Draw the scroll-work at the foot of the screen
BD59	PRINT_BORDER	Draw the border round the screen
BDC0	TRANSFER_SPRITE	Copy a sprite's four bytes into the drawing record
BDD5	TRANSFER_SPRITE_AND_PRINT	Copy a sprite's four bytes and draw it
BDDE	MULTIPLE_PRINT_SPRITE	Draw a sprite several times in a line
BDF8	READ_CONTROLS	Read the controls into INPUT
BF0D	CLEAR_COPY_BITS	Clear bit 5 of every object's flags
BF1B	DO_ANY_OBJS_INTERSECT	Does this object overlap any other?
BF56	SET_WIPE_AND_DRAW_IY	Mark the object at IY to be rubbed out and redrawn
BF66	CHK_PICKUP_DROP	Is the pick-up control pressed?
BF79	TAKE_OR_LEAVE	Pick up, or put down
C0D4	CAN_PICK_UP	Can this thing be picked up?
C107	START_PUFF	Make an object a puff of smoke
C111	PUFF	The update routine for a puff (graphics 64 to 70)
C11D	END_PUFF	The update routine for a puff's last frame (graphic 71)
C126	FIRE	Fire a bolt
C1C5	BOLT	The update routine for a bolt (graphics 149 to 151, and 60)
C206	BOLT_HIT	Has the bolt hit either thing from the sky?
C264	SHOOT_DOWN	A bolt hits a thing from the sky
C285	STILL_DEADLY	The update routine for things that kill but never move (graphics 23, 30, 74 and 75)
C291	MAKE_DEADLY	Make an object deadly both ways
C29A	DRAW_LIVES	Draw the lives icon and the number of lives on the panel
C2CE	CHOOSE_START	Choose where the game starts
C2EC	RESTART_PLAYER	Put the player back, a life fewer
C302	WON	The quest is complete
C43F	NOTHING	The update routine for what does nothing
C440	PLAYER_LEGS	The player's update routine: legs (graphics 32 to 39)
C4A3	CHK_PLYR_OOB	Is he inside the room's walls?
C4C8	HANDLE_LEFT_RIGHT	Turn the player
C56C	HANDLE_JUMP	Start a jump
C58D	HANDLE_FORWARD	Step the legs
C5BD	GET_SPRITE_DIR	Which way an object faces
C5D3	PLAYER_TOP	The player's update routine: body
C61D	MOVE_PLAYER	Move the player
C66A	CALC_PLYR_DUV	Add a step in the direction he faces
C695	STEP_U_DOWN	Step towards lower U
C69E	STEP_U_UP	Step towards higher U
C6A5	STEP_V_UP	Step towards higher V
C6AE	STEP_V_DOWN	Step towards lower V
C6B5	EXIT_STUB	Where Knight Lore checks for walking out of the room
C6B6	ENTER_ROOM	Build the room he is in
C6CC	MARK_ROOM_SEEN	Mark the player's room as seen
C6EA	PERCENTAGE	Work out and print the percentage of the quest done
C74A	STRAY_RET_OFFSETS	An unused RET
C74B	DRAW_AT_L8	Drawing offset X -8, Y 0 (graphic 57)
C750	UNUSED_OFFSETS	Three drawing offsets no graphic uses
C75F	DRAW_AT_L16_D8	Drawing offset X -16, Y -8
C764	DRAW_AT_L12_D8	Drawing offset X -12, Y -8
C769	DRAW_AT_L16_D12	Drawing offset X -16, Y -12
C775	DRAW_AT_L12_D6	Drawing offset X -12, Y -6
C77A	DRAW_AT_L12_D4	Drawing offset X -12, Y -4
C77F	DRAW_AT_L8_D4	Drawing offset X -8, Y -4 (graphics 53 to 56)
C784	DRAW_AT_L8_D2	Drawing offset X -8, Y -2 (graphics 12 to 15 and 52)
C789	SECOND_PILLAR	The second pillar of an arch (graphics 7 and 9)
C7A8	FIRST_PILLAR_EIGHT	The first pillar of an arch: graphic 8, not mirrored
C7AD	FIRST_PILLAR	The first pillar of an arch (graphics 6 and 8)
C802	HANDLE_EXIT_SCREEN	Is the player in the doorway, and has he walked out of the room?
C843	EXIT_LOW_U	Out through the wall at low U?
C874	EXIT_HIGH_U	Out through the wall at high U?
C887	EXIT_HIGH_V	Out through the wall at high V?
C89A	EXIT_LOW_V	Out through the wall at low V?
C8AD	IS_NEAR_TO	Is an object near a point?
C8D2	ARCH_NUDGE_TO_CENTRE	Nudge the player towards the middle of an arch
C907	NUDGE_ALONG_V	Nudge along V
C91A	NUDGE_ALONG_U	Nudge along U
C92C	BUILD_ROOM	Build a room's object records from the room directory
CA82	ADJUST_PLYR_UVZ_FOR_ROOM_SIZE	Put the player in the doorway he came in by
CAEE	FIND_ENTRY_ARCH	Line the player up with the arch he comes in by
CB15	ALIGN_V_TO_ARCH	Line up in V with an arch in a wall of constant U
CB29	ALIGN_U_TO_ARCH	Line up in U with an arch in a wall of constant V
CB33	ARCH_AT_HIGH_U	An arch in the wall at high U?
CB3C	ARCH_AT_LOW_U	An arch in the wall at low U?
CB45	ARCH_AT_HIGH_V	An arch in the wall at high V?
CB4E	JUMP_L16_D8	Drawing offset X -16, Y -8, by a jump (graphics 10, 11, 76, 82 and 152 to 159)
CB51	JUMP_L16_D12	Drawing offset X -16, Y -12, by a jump (graphic 77)
CB54	CLEAR_OBJECTS	Clear every object record but the player's
CB5C	CLEAR_SCREEN	Clear the screen's pixels
CB6A	FILL_ATTRS	Fill the screen's attributes with A
CB77	CLEAR_MEMORY	Clear BC bytes from HL
CB81	CLEAR_BUFFER	Clear the screen buffer
CB89	BAN_DROPS	Decide whether things may fall from the sky in this room
CBAB	SKY_DROP	Perhaps drop something from the sky
CC31	RESET_DROP_TIMER	Reset the drop timer: 80 turns while the first quest item is still to do, 8 after
CC4B	HOMER	The update routine for a homer (graphics 48 to 51 and 160 to 167)
CCE9	BOUNCE_U	Bounce off in U: reverse the U velocity
CCF2	BOUNCE_V	Bounce off in V: reverse the V velocity
CCFB	BOUNCE_Z	Unused: bounce off in Z
CD04	ACCEL_PLUS	Speed a homing velocity up the positive way
CD0D	ACCEL_MINUS	Speed a homing velocity up the negative way
CD16	COLLECTABLE	The update routine for a collectable
CD70	SPIKES	The update routine for the spikes
CD75	HEAVY_BLOCK	The update routine for a block that can only fall; and for the table
CD81	PUSHABLE	The update routine for things that fall and can be pushed
CDA0	SINKING_BLOCK	The update routine for a block that sinks under him
CDBB	LIFT	The update routine for the lift
CE31	BOBBER	The update routine for a thing that bobs up and down
CE9A	DEADLY_BOBBER	The update routine for the deadly head that bobs up and down
CEA0	DEADLY_PACER_U	The update routine for things that pace to and fro in U
CEDA	DEADLY_PACER_V	The update routine for things that pace to and fro in V
CF14	PENTAGRAM_PIECE	The update routine for a piece of the pentagram
CF22	SPIDER	The update routine for the spider that scuttles at random
CF68	QUEST_ITEM	The update routine for a quest item
CF9E	CHANGE_GRAPHIC	Give a quest thing a new graphic, in its quest record and its object record
CFB2	BOLT_TOUCHING	Is one of his bolts touching this object?
CFD2	WELL	The update routine for the well
D071	ROOM_OBJECT_LOOP	Set up a walk through the room's 48 object records
D07B	QUEST_RECORD_LOOP	Set up a walk through the quest records
D085	HEAD_FOR_TARGET	Steer towards the place in +15 and +16
D0AC	BUCKET	The update routine for the bucket
D13A	ALL_FOUR_DONE	If all four quest items are done, show the pentagram
D16F	NEW_QUEST	Set out the quest's things for a new game
D1F5	ROAMER	The update routine for a spider that runs straight, and a creature from the sky
D251	SKY_WALKER	The update routine for the walker from the sky
D2AD	CRUMBLING_BLOCK	The update routine for the crumbling block
D2DE	CONVEYOR_PLUS_U	The update routine for a conveyor that carries things forwards in U
D2E9	CONVEYOR_MINUS_U	The update routine for a conveyor that carries things backwards in U
D2F4	CONVEYOR_PLUS_V	The update routine for a conveyor that carries things forwards in V
D2FF	CONVEYOR_MINUS_V	The update routine for a conveyor that carries things backwards in V
D56C	BLIP_BY_TURN	Unused: a blip at a pitch chosen by the turn counter
D5D7	PAUSE_BEEP	The pause beep
D5E4	JUMP_SOUND	The jump's warble
D5F2	EFFECT_NOTE	Play this turn's note of the sound effect under way
D629	FIRE_SOUND	The sound of a bolt being fired
D635	FOOTSTEP	A footstep
D64E	PUFF_SOUND	The sound of a puff
D67B	BEEP	Beep: C waves of half-wave count B
D682	CLICK	One wave
D692	TABLE_WORD	Look up a word in a table
D69C	PLAY_TUNE_ONCE	Play the menu's tune at DE, once, until a key is pressed
D6B5	PLAY_TUNE	Play the tune at DE
D6C0	PLAY_NOTE	Play one note