Memory map

Address	Description
5C00	Attribute buffer (room + Willy + entities + items)
5E00	Attribute buffer (empty room)
6000	Screen buffer (room + Willy + entities + items)
7000	Screen buffer (empty room)
8000	Room layout
8080	Room name
80A0	Room tiles
80D6	Conveyor definition
80DA	Ramp definition
80DE	Border colour
80DF	Unused
80E1	Item graphic
80E9	Room exits
80ED	Unused
80F0	Entity specifications
8100	Entity buffers
8141	Unused
8200	Screen buffer address lookup table
8300	Rope animation table
8400	The game has just loaded
8420	Current room number
8421	Left-right movement table
8431	Triangle UDGs
8451	'AIR'
8454	'+++++ Press ENTER to Start +++++...'
8554	'Items collected 000 Time 00:00 m'
8574	'Game'
8578	'Over'
857C	Number of items collected
857F	Current time
8585	' 7:00a'
858B	'Enter Code at grid location     '
85AB	'Sorry, try code at location     '
85CB	Minute counter
85CC	Lives remaining
85CD	Screen flash counter
85CE	Kempston joystick indicator
85CF	Willy's y-coordinate
85D0	Willy's direction and movement flags
85D1	Airborne status indicator
85D2	Willy's animation frame
85D3	Address of Willy's location in the attribute buffer at 5C00
85D5	Jumping animation counter
85D6	Rope status indicator
85D7	Willy's state on entry to the room
85DE	256 minus the number of items remaining
85DF	Game mode indicator
85E0	Inactivity timer
85E1	In-game music note index
85E2	Music flags
85E3	WRITETYPER key counter
85E4	Temporary variable
85E5	WRITETYPER
85FB	Title screen tune data (Moonlight Sonata)
865F	In-game tune data (If I Were a Rich Man)
869F	Give two chances to enter a correct code
86C3	Display the code entry screen
873C	Read the keyboard during code entry
87CA	Display the title screen and play the theme tune
88FC	Start the game
8912	Initialise the current room
898B	Draw the remaining lives
89AD	Main loop (1)
8AEB	Cycle the INK and PAPER colours
8B07	Main loop (2)
8C01	Lose a life
8C4A	Display the game over sequence
8D33	Draw the current room to the screen buffer at 7000
8D6B	Fill the buffer at 5E00 with attribute bytes for the current room
8DC0	Copy a room attribute byte into the buffer at 5E00
8DD3	Move Willy (1)
8ED4	Move Willy (2)
8FBC	Move Willy (3)
90B6	Kill Willy
90C0	Move the rope and guardians in the current room
91BE	Draw the rope, arrows and guardians in the current room
93BB	Unused routine
93D1	Draw the items in the current room and collect any that Willy is touching
9456	Draw a sprite
948A	Move Willy into the room to the left
949E	Move Willy into the room to the right
94B0	Move Willy into the room above
94D2	Move Willy into the room below
94F9	Move the conveyor in the current room
9534	Deal with special rooms (Master Bedroom, The Bathroom)
9584	Check whether Willy has reached the toilet
959A	Animate the toilet in The Bathroom
95C8	Check and set the attribute bytes for Willy's sprite in the buffer at 5C00
961E	Check and set the attribute byte for a cell occupied by Willy's sprite
9637	Draw Willy to the screen buffer at 6000
9680	Print a message
9691	Print a single character
96A2	Play the theme tune (Moonlight Sonata)
96C9	Check whether ENTER, 0 or the fire button is being pressed
96DE	Play an intro message sound effect
96F4	Unused routine
9718	Unused
9800	Attributes for the top two-thirds of the title screen
9A00	Attributes for the bottom third of the screen
9B00	Number key graphics
9B80	Attributes for the code entry screen
9C00	Source code remnants
9C40	Foot/barrel graphic data
9C80	Maria sprite graphic data
9D00	Willy sprite graphic data
9E00	Codes
9EB3	Unused
A000	Entity definitions
A3FF	Index of the first item
A400	Item table
A600	Toilet graphics
A680	Unused
AB00	Guardian graphics
C000	Room 0x00: The Off Licence (teleport: 9)
C100	Room 0x01: The Bridge (teleport: 19)
C200	Room 0x02: Under the MegaTree (teleport: 29)
C300	Room 0x03: At the Foot of the MegaTree (teleport: 129)
C400	Room 0x04: The Drive (teleport: 39)
C500	Room 0x05: The Security Guard (teleport: 139)
C600	Room 0x06: Entrance to Hades (teleport: 239)
C700	Room 0x07: Cuckoo's Nest (teleport: 1239)
C800	Room 0x08: Inside the MegaTrunk (teleport: 49)
C900	Room 0x09: On a Branch Over the Drive (teleport: 149)
CA00	Room 0x0A: The Front Door (teleport: 249)
CB00	Room 0x0B: The Hall (teleport: 1249)
CC00	Room 0x0C: Tree Top (teleport: 349)
CD00	Room 0x0D: Out on a limb (teleport: 1349)
CE00	Room 0x0E: Rescue Esmerelda (teleport: 2349)
CF00	Room 0x0F: I'm sure I've seen this before.. (teleport: 12349)
D000	Room 0x10: We must perform a Quirkafleeg (teleport: 59)
D100	Room 0x11: Up on the Battlements (teleport: 159)
D200	Room 0x12: On the Roof (teleport: 259)
D300	Room 0x13: The Forgotten Abbey (teleport: 1259)
D400	Room 0x14: Ballroom East (teleport: 359)
D500	Room 0x15: Ballroom West (teleport: 1359)
D600	Room 0x16: To the Kitchens    Main Stairway (teleport: 2359)
D700	Room 0x17: The Kitchen (teleport: 12359)
D800	Room 0x18: West of Kitchen (teleport: 459)
D900	Room 0x19: Cold Store (teleport: 1459)
DA00	Room 0x1A: East Wall Base (teleport: 2459)
DB00	Room 0x1B: The Chapel (teleport: 12459)
DC00	Room 0x1C: First Landing (teleport: 3459)
DD00	Room 0x1D: The Nightmare Room (teleport: 13459)
DE00	Room 0x1E: The Banyan Tree (teleport: 23459)
DF00	Room 0x1F: Swimming Pool (teleport: 123459)
E000	Room 0x20: Halfway up the East Wall (teleport: 69)
E100	Room 0x21: The Bathroom (teleport: 169)
E200	Room 0x22: Top Landing (teleport: 269)
E300	Room 0x23: Master Bedroom (teleport: 1269)
E400	Room 0x24: A bit of tree (teleport: 369)
E500	Room 0x25: Orangery (teleport: 1369)
E600	Room 0x26: Priests' Hole (teleport: 2369)
E700	Room 0x27: Emergency Generator (teleport: 12369)
E800	Room 0x28: Dr Jones will never believe this (teleport: 469)
E900	Room 0x29: The Attic (teleport: 1469)
EA00	Room 0x2A: Under the Roof (teleport: 2469)
EB00	Room 0x2B: Conservatory Roof (teleport: 12469)
EC00	Room 0x2C: On top of the house (teleport: 3469)
ED00	Room 0x2D: Under the Drive (teleport: 13469)
EE00	Room 0x2E: Tree Root (teleport: 23469)
EF00	Room 0x2F: [ (teleport: 123469)
F000	Room 0x30: Nomen Luni (teleport: 569)
F100	Room 0x31: The Wine Cellar (teleport: 1569)
F200	Room 0x32: Watch Tower (teleport: 2569)
F300	Room 0x33: Tool  Shed (teleport: 12569)
F400	Room 0x34: Back Stairway (teleport: 3569)
F500	Room 0x35: Back Door (teleport: 13569)
F600	Room 0x36: West  Wing (teleport: 23569)
F700	Room 0x37: West Bedroom (teleport: 123569)
F800	Room 0x38: West Wing Roof (teleport: 4569)
F900	Room 0x39: Above the West Bedroom (teleport: 14569)
FA00	Room 0x3A: The Beach (teleport: 24569)
FB00	Room 0x3B: The Yacht (teleport: 124569)
FC00	Room 0x3C: The Bow (teleport: 34569)
FD00	Unused TRS-DOS code