Routines

Address	Label	Description
6000	ENTRY	Entry point, and the second half of the tape protection
7C19	TITLE_SCREEN	Title screen: draw the menu and poll for a selection
7C90	HIGHLIGHT_LINE	Flash or unflash a whole menu line
7CA1	SET_HIGHLIGHT	Mark the menu line under the cursor
7CA4	UNHIGHLIGHT	Take the highlight off a menu cell
7CA8	CLEAR_HIGHLIGHT	Unmark it again
7CAB	HIGHLIGHT	Put the highlight on a menu cell
7CAF	DRAW_MENU	Draw the title screen's list of options
7D8A	PRINT_MENU_LINE	Print one line of the menu
7D9A	START_GAME	Set a new game up
7DC3	MAIN_LOOP	The loop the whole game runs in
7E13	MAIN_LOOP_MONSTERS	The second pass: the monsters
7E7E	DISPATCH_ACTOR	Jump to the handler for whatever this actor is
7E93	DISPATCH_FROM_LIST	Dispatch a record named in a room's list
7EB2	FRAME_TICK	The work that happens once per frame
7EC5	FRAME_TICK_NEXT	On to the next of the three, then the clock
807A	INERT_SPRITE	A sprite that does nothing at all
8093	CLEAR_PLAY_AREA	Clear the play area, leaving the status panel alone
809A	FILL_BLOCK	Fill a rectangular block of the display file
80AA	CLEAR_SCREEN	Blank everything and black the border
80B4	CLEAR_DISPLAY	Blank the display file
80C2	CLEAR_ATTRIBUTES	Blank the attribute file
80CB	CLEAR_VARIABLES	Blank the game's variables
80D2	UPDATE_WIZARD	Per-frame update for the wizard
8134	KNIGHT_FIRE	The knight fires his axe
814B	WIZARD_FIRE	The wizard fires his spell
817C	FIRE_WEAPON	Launch the player's weapon
81DB	SPIN_AXE	Drive the spinning axe
81F0	SPIN_SPELL	Drive the wizard's spell
8283	SERF_FIRE	The serf fires his sword
82C3	SIGN_TO_DIRECTION	Turn a signed value into a direction code
82F1	AIM_SWORD	Aim the serf's sword the way it flies
8301	MOVE_ARCS	Drive the second bat, which flies in arcs
83BA	ARC_STEP	Look up the second bat's next step
83EA	SPAWN_MONSTER_INTO_ROOM	Put a new monster into the room
845F	MOVE_ACTOR	Drive the pumpkin and the spider: move, bounce off the walls, animate
8566	CHECK_SHOT_HIT	Has the player's shot hit this monster?
8598	RANDOM_POSITION	A random coordinate near the middle of the room
85B2	CHECK_HIT	Has this monster caught the player?
85EA	MONSTER_CAUGHT_PLAYER	A creature caught the player: thirty-two off, and the creature dies
85F0	ACTOR_TICK_TIMER	Count down the actor's timer, and act when it expires
85F7	SPAWN_MONSTER	The sprite a monster arrives as
862E	MOVE_BAT	Drive a bat
8672	MOVE_HOPPER	Drive the hoppers: the spiky creature and the second ghost
86F2	RANDOM_VELOCITY	Give a creature a random velocity
871A	MOVE_FACE	Drive the small face at $60-$61
8787	COUNTDOWN_ACTOR	The burst a destroyed creature becomes
87A6	MOVE_GHOST	Drive a ghost
882D	HOME_IN	Set a heading towards the player
8862	MOVE_MUMMY	Drive the mummy
8906	MOVE_DRACULA	Drive Dracula
897D	ROOM_SHAPE_OF	Find a room's shape number
8988	MOVE_FRANKENSTEIN	Drive Frankenstein's monster
89ED	MOVE_DEVIL	Drive the devil
8A15	LOSE_FOOD_SIXTEEN	Take sixteen off the life force
8A1E	LOSE_FOOD_EIGHT	Take eight off the life force
8A2F	MOVE_WITCH	Drive the witch
8A80	MOVE_FACING_FLYER	Drive the cloaked figure and the third bat, facing the way they fly
8ADB	SCAN_COLLECTABLES	Walk the eight records at $EB18
8AFF	MOVE_HUMPBACK	Drive the humpback
8B8A	DRAW_FOOD	Redraw the roast on the scroll
8C35	GAME_OVER	Clear the castle away and show how it went
8C63	EAT_FOOD	The handler for a piece of food
8C8C	FLASH_SCORE	Flash the score line while a countdown runs
8CB7	MATERIALISING	Raise the player back out of the floor
8D32	FINISH_MATERIALISING	Turn back into the character and clear the animation
8D45	DYING	Sink the player into the floor
8D61	LOAD_INITIAL_STATE	Put the castle back the way it started
8D6D	TICK_LOW_NIBBLE	Count down the low nibble of +$02
8D77	MOVE_PLAYER	Turn the controls into movement
8DC4	UPDATE_SERF	Per-frame update for the serf
8E26	UPDATE_KNIGHT	Per-frame update for the knight
8EA0	LOSE_LIFE	Take a life and start the player sinking
8ED7	LOSE_FOOD_THIRTY_TWO	Take thirty-two off the life force
8EEF	STEER	Move a heading towards a target, within limits
8F66	APPLY_HEADING	Move a creature, on the axes it is allowed to move on
8F80	SCALE_SIGNED	Divide a signed value by sixteen
8F96	DECAY_HEADING	Let a heading fall back towards nothing
8FCA	TEST_STEP_IN_ROOM	Test the player's step against the room's walk rectangle, axis by axis
8FE9	ALLOW_IF_IN_ROOM	Allow a step that stays inside the walk rectangle
900A	TEST_STEP_BOXES	Test the player's step against the doorways and tables, axis by axis
902B	TEST_ROOM_BOXES	Test one axis of the player's step against the room's doorways and tables
90CC	PLAYER_AT_DOOR	Is the player standing in this doorway?
90FB	NEAR_PLAYER	Is the player within 12 pixels of this thing?
9117	ENTER_ROOM	Move the player through a door and redraw everything
915F	TIMED_DOOR_OPEN	A timed door, open (types $21 and $23)
917D	TIMED_DOOR_SHUT	A timed door, shut (types $20 and $22)
91BC	TRAPDOOR_CLOSED	A trapdoor, closed (type $18): it opens every 256 passes
91F2	DOOR	An ordinary door
9222	DOOR_NEEDS_KEY	Will this locked door open?
9244	DOOR_LOCKED_A	A locked door of the first sort
9252	DOOR_LOCKED_B	A locked door of the second sort
9260	SET_BOTH_HALVES	Give both halves of a door the same sprite
926C	ADD_A_TO_HL	Add an unsigned byte to HL
9273	FIND_CARRIED	Is the player carrying this?
9286	DOOR_OTHER_SIDE	Swap IX to the far side of a door
9291	DRAW_ROOM_CONTENTS	Draw everything in the player's room
92D8	CLEAR_DRAW_FLAG	Clear bit 1 of the drawing flags
92E0	DRAW_AT_POSITION	Draw a thing where its record says it is
92F5	PICK_UP	Pick a collectable up
9326	REMEMBER_CARRIED	Record what has just been picked up
934C	SHIFT_CARRIED	Move the carried items along one slot
9358	DROP_CARRIED	Put the oldest carried thing back in the room
938B	READ_PICKUP_KEY	Read the pick-up key, SYMBOL SHIFT
9398	READ_CURSOR_KEYS	Read the cursor keys
93BE	READ_CONTROLS	Read the player's controls, whichever kind they chose
93E3	PUT_DOWN	Put a carried object down
9421	DOOR_SERF	A door the serf can use
9443	PLACE_PLAYER	Build the player's record from scratch
9489	PAUSE	Pause while SPACE is pressed on its own
94B6	PLACE_ACG_KEY	Hide the three pieces of the A.C.G. key
94F5	CHOOSE_TIMED_DOORS	Turn about half the plain doors into timed doors
9546	DOOR_OPEN_OR_SHUT	Open or shut a door, according to its type
954D	OPEN_DOOR	Open a door, both halves at once
9565	SHUT_DOOR	Shut a door, both halves at once
957D	CHECK_IN_DOORWAY	Note whether the player is standing in a doorway
95A9	DROP_GRAVESTONE	Leave an object where the player is standing
95D7	GRAVESTONE	The gravestone left where the player died
95DA	TICK_CLOCK	Advance the elapsed-time clock
961B	ACG_DOOR	The A.C.G. door: it opens only for the whole of the A.C.G. key
9641	DRAW_SUMMARY	Print the three end-of-game figures
96AF	MARK_ROOM_VISITED	Mark a room as seen, by writing the instruction that does it
96C9	COUNT_ROOMS_EXPLORED	Work out how much of the castle has been seen
96EC	SHOW_END_SCREEN	Draw the screen shown when a game ends
9731	TRAPDOOR_FALL	Fall through a trapdoor
986A	SET_ARRIVAL_HEADING	Head the player into the room, away from the arrival door
988B	MUSHROOM	The mushroom that drains you
98B1	MUSHROOM_DRAIN	Drain a unit of life force and go round again
98C8	MUSHROOM_KILLED_PLAYER	Rub the mushroom out and take the life
98D2	PLACE_KEYS	Put three of the keys, and the mummy, in rooms chosen for this game
9904	TABLE_LOOKUP_3BIT	Pick one of eight from a table
9924	REGROW_FOOD	Grow the food back, one slot every 512 passes
9962	DRAW_SPRITE_PIXELS	Draw a sprite, choosing the routine from the drawing mode
9980	DRAW_SPRITE_COLOURS	Draw a sprite from the other set of eight routines
9995	FETCH_SPRITE	Look up a sprite's bitmap and work out where it goes
99AF	FETCH_SPRITE_ATTRS	Look up a sprite's colours
99C9	BLIT_SPRITE	Copy a sprite to the screen, combining it however the caller asked
99E5	BLIT_SPRITE_MIRRORED	Copy a sprite to the screen, back to front
9A0A	DRAW_TURNED_RIGHT	Drawing mode 2: furniture's pixels turned a quarter clockwise
9A50	DRAW_FLIP_ANTIDIAGONAL	Drawing mode 3: furniture's pixels mirrored across the bottom-left to top-right diagonal
9A92	REVERSE_BITS	Turn a byte back to front
9A9D	NEXT_SPRITE_ROW	Step the sprite pointer on by one row
9AA5	PREVIOUS_SPRITE_ROW	Step the sprite pointer back one row
9AAD	MULTIPLY	Multiply DE by A
9ABA	START_AT_LAST_ROW	Point at the bottom row of a sprite
9ACB	DRAW_UPSIDE_DOWN	Drawing mode 4: furniture's pixels upside down
9AEF	BLIT_SPRITE_FLIPPED	Drawing mode 5: furniture turned a half turn (mirrored and upside down)
9B14	DRAW_FLIP_DIAGONAL	Drawing mode 6: furniture's pixels mirrored across the top-left to bottom-right diagonal
9B5D	DRAW_TURNED_LEFT	Drawing mode 7: furniture's pixels turned a quarter anticlockwise
9BA2	PIXEL_TO_SCREEN	Convert pixel coordinates to a display file address
9BC1	NEXT_PIXEL_ROW	Step a screen address down one pixel row
9BD2	PIXEL_TO_ATTR	Convert pixel coordinates to an attribute file address
9BEA	DRAW_ROOM	Draw the room the player is in
9C2F	DRAW_OUTLINE	Walk the edge list and draw the room's outline
9C61	PLOT_PIXEL	Plot one pixel
9C79	DRAW_LINE	Draw a line between two points
9D19	SPRITE_COMBINE_OPCODE	Choose the instruction that puts a sprite byte on the screen
9D25	COLOURS_AS_STORED	Drawing mode 0: furniture's colours as stored
9D47	COLOURS_MIRRORED	Drawing mode 1: furniture's colours mirrored
9D6F	COLOURS_TURNED_RIGHT	Drawing mode 2: furniture's colours turned a quarter clockwise
9DA0	COLOURS_FLIP_ANTIDIAGONAL	Drawing mode 3: furniture's colours mirrored across the bottom-left to top-right diagonal
9DCE	COLOURS_UPSIDE_DOWN	Drawing mode 4: furniture's colours upside down
9DF8	COLOURS_HALF_TURN	Drawing mode 5: furniture's colours turned a half turn
9E21	COLOURS_FLIP_DIAGONAL	Drawing mode 6: furniture's colours mirrored across the top-left to bottom-right diagonal
9E55	COLOURS_TURNED_LEFT	Drawing mode 7: furniture's colours turned a quarter anticlockwise
9E86	SPRITE_OF_WORKSPACE	Find the graphics for what is in the workspace
9E89	SPRITE_ADDRESS	Find a sprite's graphics
9E96	SPRITE_OF_ACTOR	Find this actor's graphics
9E9B	ERASE_DRAW_ROWS	Erase the old rows and draw the new, interleaved
9ECE	ERASE_UNSHIFTED	XOR two unshifted bytes: the erase path's plot for a thing on a cell boundary
9EDC	FETCH_ROW	Read two bytes of a sprite row
9EE6	ERASE_SHIFT_CHAIN	The erase path's unrolled shift chain
9F03	SCREEN_ROW_UP	Move a display file address up one pixel row
9F13	DRAW_UNSHIFTED	XOR two unshifted bytes: the draw path's plot for a thing on a cell boundary
9F21	SHIFT_AND_PLOT	Shift one row of a sprite into place and draw it
9F2B	SHIFT_CHAIN	Seven shifts, entered part-way down
9F40	SETUP_ALT_ENTRIES	Two short entries into the drawing setup
9F4A	DRAW_THING	Draw a record's sprite
9F56	ERASE_THING	Rub a record's sprite out
9F74	SETUP_BOTH_BANKS	Set up the drawing address in both register banks
9F80	SETUP_ERASE	Work out where a thing used to be
9F9F	SETUP_SPRITE_DRAW	Work out where a sprite goes, and how far to shift it
9FCA	REDRAW_MOVED	Redraw a thing that may have moved
9FFB	ACTOR_TO_WORKSPACE	Copy an actor's position and sprite into the drawing workspace
A00E	WORKSPACE_AND_DRAW	Note where a thing is, then draw it
A07A	COLOUR_STILL	Colour a thing that has not moved
A08D	COLOUR_MOVED_RIGHT	Colour a thing that moved right
A0A3	COLOUR_MOVED_LEFT	Colour a thing that moved left
A0B7	COLOUR_MOVED_DOWN	Colour a thing that moved down
A0D2	COLOUR_MOVED_DOWN_RIGHT	Colour a thing that moved down and right
A0EC	COLOUR_MOVED_UP	Colour a thing that moved up
A0FE	COLOUR_MOVED_UP_LEFT	Colour a thing that moved up and left
A110	COLOUR_MOVED_DOWN_LEFT	Colour a thing that moved down and left
A127	COLOUR_MOVED_UP_RIGHT	Colour a thing that moved up and right
A13B	DRAW_INVENTORY	Draw the three carried objects on the scroll
A14D	DRAW_LIST	Draw a list of things through the scratch record
A185	ERASE_STRIP	Blank twenty bytes where something was
A19C	ADD_SCORE	Add to the score and redraw it
A1D3	PLOT_TILE	Plot one 8x8 tile and step right
A1F3	PRINT_STRING	Print a string of tiles in a single colour
A219	DRAW_SCROLL	Draw the scroll down the side of the screen
A240	PAINT_PANEL	Colour the status panel to go with the room
A2CE	DRAW_LIVES	Draw the remaining lives on the scroll
A311	DRAW_TITLE_ICONS	Draw the nine pictures on the title screen
A379	DIVIDE_SLOPE	Divide, for a line's slope
A39E	NEGATE_HL	Negate HL
A3A8	BEEP	Square wave on the beeper
A3BD	BEEP_ENTRIES	Two more ways into BEEP
A3C7	SOUND_FOOTSTEP	The footstep, two tones alternating
A3E0	SOUND_LIFE_PIP	The pip that goes with the flashing score at the start of a life
A3E5	PLAY_SOUND_CAUGHT	Start sound $64, the one for being caught
A3EF	SOUND_CAUGHT	Sound $64 (being caught), one frame of it
A3FE	END_SOUND	Free the slot when a sound finishes
A403	PLAY_SOUND_NEW_ROOM	Start sound $65
A408	SOUND_NEW_ROOM	Sound $65 (entering a room), one frame of it
A41B	SOUND_SWEEP_A41B	A short sweep
A427	SOUND_SWEEP_UP	A rising sweep
A438	SOUND_SWEEP_DOWN	A short falling sweep
A445	SOUND_WEAPON_GONE	The sound of a weapon's flight ending, or a burst ending
A45F	SOUND_RISE_SINK	The note of the player sinking or rising
A46E	SOUND_NOISE_BURST	A short burst of noise
A485	PLAY_SOUND_EATING	Start sound $A0
A48B	SOUND_EATING	Sound $A0, one frame of it
A4B0	SOUND_BOUNCE	The sound of a weapon bouncing off a wall