Routines

Address	Description
80E5	Show title screen
813B	Set up initial game data
8155	Demo mode
8184	Main entry point
81AE	Move everything on screen
81C4	Check for the pause key
81D4	Change direction
81E3	Change a sprite to the reverse direction
A83D	Put a static object in the sprite buffer, without a mask
A8A0	Draw a masked object in the sprite buffer
A921	Set the zero flag if the player is the current one
A92C	Move the computer controlled characters
AA30	Swap an item when a character moves over it
AA7F	Generate an "item swapped" sound effect
AA8C	Get address of the item object buffer given its ID
AAB2	Movement routine 0. Check a character can be moved left, and do so if possible
AADD	Movement routine 1. Check a character can be moved right, and do so if possible
AB09	Movement routine 2. Move to 78 , 98
AB26	Movement routine 3. Move to 30 , 98
AB43	Movement routine 4. Move to C0 , 98
AB60	Movement routine 5. Move to 00, 58 (Sewer left)
AB9B	Movement routine 6. Move to F0 , 58 (Sewer right)
ABD7	See if the 'in' key was pressed and set A to 1 if it was
AC06	New room check
AC5F	Get the address for the co-ordinate table of a room
AC69	Get the address of the next room table for this room and put it in HL
AC6C	Search for FF a number of times and return a pointer to the next entry after it
ADBA	Move a computer-controlled character between rooms.
AE30	Get a flag to specify if a room can only be reached via the "in" key
AE5D	Get the new room and co-ordinates for a computer controlled player.
AE8A	Find the address of an item with the specified index
AED7	Get the next room that a computer controlled character should swap items
AF01	Set the next room for the jumping jack or Herbert to appear in
AFC4	See if a player is in mid-air, and drop them on a platform or ground
B00B	Check that 'right' has been pressed, and set A to 1 if it has
B03C	Check that 'left' has been pressed, and set A to 1 if it has
B06D	Check that 'jump' has been pressed, and set A to 1 if it has
B09F	Check for user input and act on it
B0E6	Put a character into the sprite buffer
B197	Drop the current character's height down one notch up to floor level
B1A6	Make the current character jump
B288	Move a character left or right
B2DC	Select Sinclair control
B2E2	Select Kempston control
B2E8	Select Keyboard control
B2F1	Print a breakdown of who earned what
B34C	Print a monetary value on screen
B3AB	Wait for a keypress and return it in A
B3C3	The safe has been cracked! Get everyone together and print earnings.
B451	The game has ended. Print the final score.
B471	Initialize the theme tune data
B482	Play the next note of the theme tune and get a keypress
B4EB	Pause and collect a keypress from 1 - 4
B505	Play a note in the theme tune
B715	Put a character on screen
B77B	Print an inventory graphic
B7BA	Print a graphic on screen
B7F9	Put a room graphic in screen overlaying existing ones
B82B	Overwrite part of the screen buffer with a graphic
B84B	Draw a room graphic
B8C4	Print an FF terminated string, processing control characters
B8ED	Blank the screen
B902	Clear the room's graphics
B931	Clear the top status bar
B952	Draw a room's background graphics
B9AC	Copy the screen to the working buffer
B9D6	Draw any characters that are in this room
B9FB	Put the sprites on screen
BA25	Copy a row of screen or attribute data
BA6E	Print a "{character} is in {room}" message
BAB4	Update the tick counter for the "{character} is in {room}" display
BACE	Get the length of a string
BAD8	Initialize character data
E2FC	Play a footstep sound effect
E329	Check for collision detection
E36D	Update endurance and lives display
E3D3	Generate a sound effect
E3EC	Generate one wave cycle in a sound effect
E3FD	Do a full refresh of the top status bar
E41D	Print a character's inventory
E468	Display an item in the inventory
E77A	Clear the inventory display, so new text can go on
E79B	See if a player wants to swap character, and do so if they can
EABF	Process logic for the current room
EAE3	A condition does not match. Skip to the ENDIF (F6) character.
EAEB	A condition matches. Process any actions in it.
EB01	Action 0 : SWAP. An item can be collected. Swap it for the oldest item.
EB0F	Action 1 : SWAPFOR. An item can be collected. Swap it for a specific item.
EB55	See if the player is touching any collectable item
EB79	Action 6 : WALL. The wall is or can be built. Patch the logic in Wall Street for it.
EB95	Pattern 0 AT OBJ(x) : Match if at an item
EBC4	Pattern 4 AT(x,y) : Match if at co-ordinate x,y
EBE2	Pattern 5 AM(x) : Match if we are a character (bitfield)
EBED	Pattern 1 HAS(x) : Match if item xx held
EBFE	Pattern 6 NOT HAS(x) : Match if item xx NOT held
EC1D	Get a game status flag and return it in A, setting the zero flag appropriately
EC2B	Pattern 3 OBJ(x,y) : Match if room object x is y
EC34	Pattern 7 NOT OBJ(x,y) : Match if room object x is not y
EC3D	Check if the item in a room matches a certain object ID and sets the zero flag if it is
EC4A	Set a game flag to a value
ECBC	Action 5 EARN(x). Pay the current character amount in offset x
ED13	Room logic : The Laboratory
ED2A	See if we've reached a break, and display a message if so
ED8A	Set up moving objects in the Laboratory
EDA3	Action 2 SET(x) : Set flag xx
EDA8	Action 3 RESET(x) : Reset flag xx
EDAC	Action 4 SET(x,y) : Set flag xx to yy
EDB3	Pattern 2 SET(x) : Match if flag x set
EDC6	Action 8 SAFE. The safe has been touched with a combination letter. Process it now.
EDF7	Action 7 SPACE. Play the "asteroids" phone box game
EEA2	Initialise the sprite buffers
EEC1	Refresh the current room
EF35	Update the current position of moving objects
EF91	Set the attributes for the fountain in the town square if it is repaired
EFC7	Action 9 CHASE. Drop down to the "shark chase" game
F047	Flip the shark so it's the right way round.
F057	Chase : Update the shark
F0C0	Chase : Check for player movement
F10E	See if the jumping jack needs to be on screen, and if so, move it
F177	Action A OUT. Go to the "out of town" screen
F202	Print the current miles "out of town"
F233	Print a digit for the miles "out of town"
F24B	Room logic : The Post Office.
F277	Move Herbert
F309	Room logic : The Pub
F334	Room logic : The Zoo
F37D	Room logic : The Docks
F3AB	Room logic : The Sewer
F409	Room logic : The Bakers
F43C	Room logic : Wall Street
F49D	Room logic : The Work Shed
F4D3	Room logic : Motor Way
F503	Room logic : The Super Market
F54F	Room logic : The Cave
F572	Room logic : Town Square
F5F1	Room logic : School Lane
F674	Room logic : The Park
F6EC	Room logic : The Bank
F746	Room logic : Wally's House
F773	Room logic : The School
F814	See if any food is in the current room, and display it if so
F8B9	Asteroids : Check for collision with lightning
F93A	Asteroids : Check for player's movement
F9A4	Asteroids : Get the change values for the current direction
F9C4	Asteroids : Generate a "hit lightning" sound
F9F5	Asteroids : Check for firing missile and animate accordingly
FAE7	Asteroids : Play a note of the "won" sound effect
FAF0	Asteroids : Move the lightning bolts around