Memory map

Address	Description
6000	The game has just loaded
6229	Main loop
624F	Read the keyboard and update Horace's sprite accordingly
6337	Move Horace and the guards
63DA	Move a guard
651E	Redraw the tiles behind Horace and the guards if they've moved
655B	Redraw the tiles behind a guard after he's moved
65A1	Add to the score if Horace has eaten something
6622	Draw the guards
663D	Draw a guard
66A4	Check whether Horace has run into a guard
673A	Lose a life
6821	Draw Horace
686A	Draw the bell and check whether Horace has sounded the alarm
6907	Check whether a guard should drop his lunch
6922	Make a guard drop his lunch if necessary
696C	Decrement the guard countdown timers
698E	Toggle the sound on/off if 'T' is pressed
69A4	Ring the bell if necessary
6A17	Unused
6A1E	Enter the next maze
6A22	Initialise the guard countdown timers
6A3F	Copy a guard buffer into the temporary location
6A6A	Copy the temporary guard buffer back into place
6A77	Make the title screen or game over sound effect
6A9E	Get the tunnel offset and bell, initial guard and entrance locations for the current maze
6AA7	Copyright © 1982 Beam Software...
6AE7	DEMO MODE  PRESS ANY KEY TO PLAY
6B08	Title screen countdown timer
6B0A	Active guard counter
6B0B	Game mode indicator
6B0C	Wait for 26*BC+5 T states
6B12	Collect a pseudo-random number (from the ROM)
6B21	Print the score or high score
6B48	Compute and print a digit
6B75	Draw the current maze
6BD6	Draw a sprite
6BFA	Print a tile or font character
6C0F	Convert a sprite location or display file address into an attribute file address
6C20	Check the attribute bytes at a sprite's location
6C46	Check the attribute byte at a sprite tile location
6C68	Copy maze background tiles into a guard's buffer
6C95	Copy a maze background tile into a guard's buffer
6CC2	Check the tiles next to Horace or a guard
6CFA	Identify a tile in front of a sprite
6D17	Get the location of the tile in front of a sprite
6D4E	Print 'HUNGRY' or 'HORACE' on the title screen
6DA6	Guard countdown timers
6DAE	Guard panic timer
6DB0	Temporary store for a guard's screen x- and y-coordinates
6DB2	Temporary store for direction probability parameters
6DB6	Buffer address of the guard currently being handled
6DB8	Temporary guard buffer
6DE3	Guard buffers
6E8F	Data for the word 'HUNGRY' on the title screen
6F2F	Data for the word 'HORACE' on the title screen
6FCF	Tunnel offset and bell, initial guard and entrance locations for the current maze
6FD7	Tunnel offset and bell, initial guard and entrance locations for maze 1
6FDF	Tunnel offset and bell, initial guard and entrance locations for maze 2
6FE7	Tunnel offset and bell, initial guard and entrance locations for maze 3
6FEF	Tunnel offset and bell, initial guard and entrance locations for maze 4
6FF7	Maze 2 layout
72F7	Maze 1 layout
75F7	Maze 3 layout
78F7	Maze 4 layout
7BF7	Maze tiles
7C47	PASSES   SCORE       BEST
7C61	Sprite movement timer
7C62	Game speed parameter (1-8)
7C63	Current maze number
7C64	Redundant temporary variable
7C65	Lunch-drop countdown timer
7C67	Address of the next pseudo-random number
7C69	Sound on/off indicator
7C6A	'T' pressed indicator
7C6B	Horace's current location
7C6D	Horace's new location
7C6F	Temporary store for direction keypress
7C70	Horace's animation frame (0-3)
7C71	Horace's attribute byte
7C72	Horace's walking animation timer
7C73	Score
7C75	High score
7C77	Extra life indicator
7C78	Number of lives remaining
7C79	Tunnel timer
7C7A	Temporary store for Horace's screen x- and y-coordinates
7C7C	Cherry and strawberry graphics
7CC4	Bell location
7CC6	Bell animation frame counter
7CC7	Horace graphics
7DC7	Guard graphics
7F07	Bell graphics
7F87	Blank sprite