Routines

Address	Label	Description
5B80	LOADER	The loader's routine: unscramble the game and start it
5CB0	NMIADD	The dispatcher's jump
5E00	ENTRY	Where the loader enters the game
BDFE	START	The start: the first protection check, and every variable cleared
BE0F	NEW_GAME	Set up a new game, then run the main loop
BEDF	PERCENTAGE	Work out the percentage of the game done
BF36	PRINT_PERCENTAGE	Print the percentage
BF48	VISIT_CELL	Mark the knight's cell visited, and sound a new one with a building
BF95	SPAWN_CREATURE	Every 256 turns, bring the creature into the knight's cell
BFF1	CREATURE_UPDATE	The update routine for the creature (graphics 136-139)
C02C	STEER_AT_KNIGHT	Step the thing at IX two units towards the knight along each axis
C057	CLEAR_MONSTERS	Empty the six monster records
C069	NEAR_KNIGHT	Is the thing at IX less than C cells from the knight?
C083	MONSTER112_UPDATE	The update routine for a monster of graphics 112-127
C0D9	MONSTER_TOO_FAR	Forget a monster that is too far from the knight
C0DE	HIT_DESTROYS	An antibody's strike that destroys the monster: 2500 points
C0ED	HIT_CHANGES	An antibody's strike that changes the monster into the next kind: 2000 points
C101	HIT_SPLITS	An antibody's strike that splits the monster in two: 1500 points
C152	HIT_DEMOTES	An antibody's strike that turns the monster into one of graphics 64-79: 1000 points
C164	APPEARING_UPDATE	The update routine for a monster appearing (graphics 128-131)
C19C	NEAREST_VILLAIN	Which villain is nearest the thing at IX?
C1B9	VILLAIN_DISTANCE	How far is the villain at IY from the thing at IX?
C1DB	STOCK_BUILDINGS	Stock the buildings with finds, then the third protection check
C1FD	DRAW_VILLAINS	Draw the four villains on the panel
C28A	SCREEN_LINE_UP	Move a screen address up one pixel line
C29A	PRINT_HEADING	Print the heading on the panel: north, or south with the town turned round
C2C8	PRINT_COMPASS	Draw the compass on the panel
C2ED	ADD_SCORE	Add BC to the score, and print it
C314	PRINT_BCD	Print B bytes of BCD from DE, two digits a byte
C332	BLIP_BY_TURN	The creature's blip: a note chosen by the turn counter
C39D	ENDING_BEEP	A note for the ending, a little lower each time
C3AA	BUMP_SOUND	The bump: a warble as something walks into a wall
C3BD	EFFECT_NOTE	Play this turn's note of the sound effect under way
C3F4	FIRE_SOUND	The sound of a throw
C400	FOOTSTEP	A footstep
C435	PUFF_SOUND	The sound of a puff
C455	APPEAR_SOUND	A monster appearing: a note pitched by its graphic
C463	ARRIVE_SOUND	The knight appearing: a note that rises
C471	CLICK	One wave
C481	PICK_UP_FIND	Taking up a find: which kind of antibody it gives
C489	PICK_UP_THING	Take up a thing the knight touches, if he has room
C4DC	COLOUR_CARRIED	Colour the carried things on the panel, flashing an object near its villain
C538	ANTIBODY_STRIKE	Is the thing at IX struck by an antibody?
C54A	ANTIBODY_TOUCHING	Does the antibody at IY touch the thing at IX?
C554	OBJECT_STRIKE	Does a thrown object touch its villain?
C55F	TOUCHING_KNIGHT	Does the thing at IX touch the knight?
C5B4	NEXT_TURN	Count a turn, and stir the random number
C5CE	SPAWN_FIND	Every sixteen turns, a find in the knight's cell if its type has any left
C63D	PLAY_TUNE_ONCE	Play the menu's tune at DE, once, until a key is pressed
C656	PLAY_TUNE	Play the tune at DE
C661	PLAY_NOTE	Play one note
C83F	DRAW_PANEL_FRAME	Draw the frame round the carried things
C889	COLOUR_STRIP	Colour a strip two cells wide in the play area's attributes
C898	COLOUR_KNIGHT	Colour the knight by the hits he has left
C8B2	FILL_ATTR_RECT	Fill a rectangle of the play area's attributes
C8CA	MENU	The menu
C949	FLASH_MENU	Flash the chosen lines on the menu
C9EF	PRINT_TEXT_SINGLE_COLOUR	Print a string in one colour
C9FC	PRINT_TEXT	Print a string whose first byte is its colour
CA1B	TOGGLE_SELECTED	Flash one of B attributes, and steady the rest
CA22	FLASH_NEXT_ONE	The rest of TOGGLE_SELECTED
CA2B	DISPLAY_MENU	Draw the menu
CA55	DRAW_PLAY_FRAME	Draw the frame round the play area
CA9D	PRINT_BORDER	Draw the border round the screen
CAFD	PRINT_BLOCK_ROW	Print a piece several times along a row
CB09	PRINT_BLOCK_COLUMN	Print a piece several times down a column
CB19	PRINT_CHAR	Print a character on the screen
CB3E	PRINT_BLOCK	Print four characters as a piece two characters square
CB5B	PRINT_CHAR_COLOURED	Print a character and colour its cell
CB71	NEXT_CHAR_ROW	Move a screen address down a character row
CB7B	RANDOM_START_CELL	Choose the cell a new game starts in
CBAC	NEW_LIFE	Start a new life when the knight's record is empty
CC1D	PRINT_LIFE_ICON	Print a life's picture on the panel
CC56	GAME_OVER	Game over: the percentage and the score, then the menu, or the ending if the villains are gone
CD02	CLEAR_OBJECTS	Empty all 23 object records
CD10	ENDING_PIT_FRONT	The ending: the front of the pit (graphic 152), and the end of the ending
CD58	ENDING_VILLAIN	The ending: a villain carried over the pit and sunk into it (graphics 144-151)
CD9E	STEP_TOWARDS_X	How far an ending picture should move across this turn
CDDF	GAME_OVER_PAUSE	Wait about half a second
CDE8	SPAWN_MONSTER	Bring a monster into a cell next to the knight's
CE89	WANDERING_MONSTER	The monsters of graphics 64-79: wander, and hurt the knight
CEF8	NEXT_FRAME_MOD4	Step an object through four frames
CF08	DRAW_CELLS	Draw the cells round the knight, back to front
CFAF	LIST_THINGS_IN_CELL	List the things in a cell
CFF2	SORT_AND_DRAW_THINGS	Draw the listed things, furthest back first
D0C4	DEPTH_KEEP	The candidate stays
D0C5	DEPTH_SWAP	The other thing becomes the candidate
D0D0	DEPTH_BY_CORNERS	Order two things whose boxes overlap on both axes
D17D	TURN_CELL	Turn a cell round with the town
D18E	TURN_POSITION	Turn a position round with the town
D19D	DRAW_OUTLINE	Draw a building's outline on the ground
D1FA	OUTLINE_NEAR_FACES	Draw the edges of a building definition's two faces
D22D	STEP_RIGHT_UP	Move the drawing position a column right and up
D232	EDGE_RIGHT_UP	Move the drawing position a column right and up, past the column's tiles
D24B	EDGE_RIGHT_DOWN	Move the drawing position a column right and down, past the column's tiles
D250	STEP_RIGHT_DOWN	Move the drawing position a column right and down
D255	EDGE_LEFT_UP	Move the drawing position a column left and up, past the column's tiles
D26E	EDGE_LEFT_DOWN	Move the drawing position a column left and down, past the column's tiles
D273	DRAW_EDGE	Draw the edge picture under one column of a building
D2A2	CLIP_EDGE	Draw an edge picture that starts below the play area
D2B2	PUT_EDGE	OR a 16-pixel picture into the buffer
D356	COLOUR_WALL	Colour a column of wall up to the top of the play area
D372	DRAW_WALLS	Draw a building's walls
D3C2	DRAW_WALL_COLUMN	Draw one column of a wall, unless a nearer wall has it
D415	CLIP_TILE	Draw a tile that starts below the play area
D425	PUT_TILE	Draw a tile of wall
D4F3	PROJECT_THING	Where a thing is on the screen
D508	PROJECT_CELL	Where a cell's corner is on the screen
D564	LOOK_UP_CELL	The type of a cell of the town
D589	TABLE_WORD	Look up a word in a table
D593	DISPATCH	Jump to the routine a table gives for A
D6D5	NO_UPDATE	An update routine that does nothing
D6D6	VILLAIN_SPARKLES	Send four sparkles out from a villain destroyed
D70A	SPARKLE_FLY	The update routine for a sparkle from a destroyed villain (graphics 140-143)
D727	SPEED_BONUS	The update routine for the bonus of graphic 2: a faster walk
D74C	HITS_BONUS	The update routine for the bonus of graphic 3: all three hits back
D76C	PLACE_BONUS	Put a bonus near the knight when there is none
D7D8	VANISHING	The update routine for something vanishing (graphics 12-15)
D7ED	ANTIBODY_FLIGHT	The update routine for an antibody in flight (graphics 80-95)
D80C	OBJECT_FLIGHT	The update routine for a thrown object (graphics 8-11)
D847	VILLAIN_DYING	The update routine for a dying villain (graphics 132-135)
D865	CHECK_QUEST_DONE	End the game when the four villains are gone and their sparkles have left the screen
D88E	PLACE_OBJECTS	Put the four objects in random cells at a new game
D8E7	PLACE_VILLAINS	Put the four villains in random cells at a new game
D942	OBJECT_LYING	The update routine for an object lying in the town (graphics 4-7)
D94F	VILLAIN_WANDER	The update routine for a villain (graphics 96-111)
D978	FACING_PICTURE	Set a villain's or a monster's picture for its facing
D9A3	FIND_WANDER	The update routine for a find in a building (graphics 48-63)
D9EB	UPDATE_TOP	The update routine for the knight's top (graphics 22, 30, 32-47)
DA7A	UPDATE_KNIGHT	The update routine for the knight's legs (graphics 16-21, 24-29)
DAB7	KNIGHT_THROWS	Throw the last thing taken up
DB68	TURN_TOWN	Turn the town round when its key is let go
DB89	TURN_KNIGHT	Turn the knight, by the controls
DC43	SWAP_STICK	Turn a stick's directions round with the town
DC60	KNIGHT_WALKS	Walk, or come to a stop on the grid
DC79	COAST_PLUS_V	Come to a stop facing +V
DC92	COAST_PLUS_U	Come to a stop facing +U
DC97	COAST_MINUS_V	Come to a stop facing -V
DC9E	COAST_MINUS_U	Come to a stop facing -U
DCA3	STAND_ON_GRID	Stand still, on the grid
DCA8	WALK_ON	Walk on, speeding up
DCE0	SET_STEP	Set a record's step from its speed and facing
DD01	APPLY_STEP	Move a record by its step
DD28	STEER	Decide whether a walker turns: at a wall, when its count runs out, or towards the knight
DD72	STEER_EITHER	Turn a chaser towards the knight
DD99	KNIGHT_DIRECTION	Which way is the knight from a record?
DDCF	WANDER_STEP	Now and then give a wanderer a new random step
DDFC	RANDOM_STEP	A random step from the bits of a byte
DE0D	MOVE_SPLIT	Trim a two-way step at the walls, one axis at a time
DE59	MOVE_CLIPPED	Trim a record's step at the town's walls
DE72	CLIP_PLUS_V	Trim a step along +V at the walls
DED3	CLIP_PLUS_U	Trim a step along +U at the walls
DF34	CLIP_MINUS_V	Trim a step along -V at the walls
DF97	CLIP_MINUS_U	Cut a step in -U short at the boxes of the cells ahead
DFFA	CUT_STEP_PLUS_V	Cut a step in +V short at a box of a cell
E00B	CUT_STEP_MINUS_V	Cut a step in -V short at a box of a cell
E013	CUT_STEP_PLUS_U	Cut a step in +U short at a box of a cell
E020	CUT_STEP_MINUS_U	Cut a step in -U short at a box of a cell
E028	PLACE_IN_CELL	Look up a cell of the town, and where the object is in it
E063	HIT_BOXES_U	Does the moved object run into a box of a cell? Give the overlap in U
E087	OVERLAP_U	Do the moved object and a box overlap in U?
E0A0	HIT_BOXES_V	Does the moved object run into a box of a cell? Give the overlap in V
E0C4	OVERLAP_V	Do the moved object and a box overlap in V?
E0DD	NEGATE_HL	HL = -HL
E0E5	SIGN_EXTEND_A	HL = A, read as a signed number
E0EE	HL_EQUALS_DE_X_A	HL = DE * A
E0FB	MAKE_TABLES	Build the drawing tables
E148	COPY_BUFFER	Copy the play area's pixels from the buffer to the screen
E1AD	COPY_ATTR_BUFFER	Copy the play area's attributes from the buffer to the screen
E200	SHOW_PLAY_AREA	Show this turn's play area, and clear the buffers for the next
E239	READ_KEYS	Read a half-row of the keyboard
E241	READ_CONTROLS	Read the controls into CONTROLS
E32C	PAUSE	Pause, when SPACE or CAPS SHIFT is pressed on its own
E353	TURN_SPRITE	Find an object's sprite, and turn its stored data the way the object wants it
E3D6	MIRROR_SPRITE	Mirror a sprite's data, whichever way it is stored now
E3D9	DRAW_SPRITE	Draw one object from the draw list
E49F	SPRITE_ALIGNED_RUN	The unrolled row of a byte-aligned sprite
E4A7	SPRITE_ALIGNED_FOUR	The rest of the byte-aligned run
E4C9	SPRITE_ROW	Start a row of a sprite
E4CD	SPRITE_SHIFTED_RUN	The unrolled row of a shifted sprite
E4DF	SPRITE_SHIFTED_FOUR	The rest of the shifted run, and the step to the next row
E53A	BUFFER_ADDRESS	The buffer address of a pixel position
E556	CALC_VRAM_ADDR	Display address of a pixel position
E579	ATTR_ADDRESS	The attribute buffer address of a pixel position
E596	ADD_HL_A	HL = HL + A
E59D	CLEAR_SCREEN	Clear the screen
E5A8	CLR_BITMAP_MEMORY	Clear the display's pixels
E5B0	CLR_ATTRIBUTE_MEMORY	Set the display's attributes to bright white ink on black paper
E5BA	CLEAR_MEMORY	Clear BC bytes from HL