Used by the routines at 59861, 60032, 61630, 61696, 62368 and 64599. Each byte of the screen refresh buffer (SRB) corresponds to a segment of 8 character squares on the screen, the leftmost of which will be at x=0, x=8, x=16 or x=24. Each bit set in an SRB byte corresponds to a character square in the segment that needs refreshing. Bit 7 corresponds to the leftmost character square in the segment, bit 0 to the rightmost character square.

Note that, owing to a quirk in the way the SRB-updating routine at 59861 works, the first 16 bytes of the screen refresh buffer correspond not to any part of the screen, but to the four rows of the play area that are immediately above the currently visible portion of the play area. Therefore, the screen-updating routine at 60032 ignores those bytes and starts inspecting SRB bytes at 32528 instead.

Note also that the routine at 28357 uses the first 16 bytes of the SRB as a temporary backup store for the submessage indicator and submessage addresses at 32641, and the routine at 64618 uses the first 32 bytes of the SRB as a temporary store for the top row of attribute bytes when scrolling the screen up and down.

Used by the routine at 28357 to prepare a message before displaying it. Also used by the routines at 61838 and 61882 as temporary storage for one of the character buffers in groups 215-221.

Used by the routine at 28357.

Used by the routines at 30575 and 30627. Holds either the address of the second byte of the entry in the phone message table at 27467 or 27506 that corresponds to the phone that Sam is calling (if the person on the other end has a message for him) or picking up a call from, or the address of the final byte of the phone table at 27506 (if the person Sam's calling has no message to give); this address contains the number of the message corresponding to the name that Sam must give in order to receive the telephone message, or 0 if no name is required to receive the message, or 255 if the person Sam's calling will respond with message 46 (I DUNNO NO {name}).

Checked by the routine at 30429 and set by the routine at 30458 (to the value of the second byte of the the system variable FRAMES, which is incremented every 5.12s).

Checked by the routines at 29952 (using the event entry at 24644) and 30511, and updated by the routines at 29149, 30575, 31244 and 61923.

Used by the routines at 30198, 30458, 30575, 30675 and 31244.

Bit(s)	Meaning if set
0	Unused
1	The telephone call is finished (disconnected)
2,3	Unused
4	A digit is being dialled
5	The destination telephone is ringing
6	Sam must give a name in response to 'WHO'S THERE?'
7	Sam has picked up a ringing telephone

Checked by the routine at 61630, and updated by the routine at 28337.

Checked by the routines at 31594, 31642 and 61630, and updated by the routines at 24832 and 28295.

Used by the routine at 28357. Holds the two least significant bytes of the system variable FRAMES as they were when the last message was displayed.

When a fuse is blown, the corresponding delay counter here is initialised by the routine at 29866. The delay counters are checked and decremented by the routine at 62468.

Used as a temporary buffer by the routines at 29668, 29733 and 30211. Each bit set here (by the routine at 29733 or 30211) corresponds to an icon that should be displayed in the panel.

Bit(s)	Icon
7	Fuse/Budgie
6	Door/Hook
5	Light bulb
4	Telephone
0-3	Unused

Decremented and checked on every pass through the main loop by the routine at 61440, and also checked by the routine at 61764.

Used by the routines at 62120, 63304 and 63437. The bits in each byte here are used as follows:

Bit(s)	Meaning if set
7	Somebody has just knocked on the door
6	Somebody is going to answer the door
0-5	Unused

Used by the routine at 61948, which stores a non-zero value here if any fuses are currently blown.

Used by the routines at 29866 and 30116. A bit set here indicates that the corresponding fuse has already been blown once. Bits 6 and 7 are unused.

Bit	Fuse
0	No. 74
1	Hotel
2	No. 31
3	No. 19
4	No. 17
5	No. 15

Used by the routines at 28357 and 30160.

Used by the routines at 28357, 30160 and 64121.

Used by the routines at 25118, 26075 and 26224.

Used by the routines at 25118, 26075 and 26224.

Stores the value of the LSB of the system variable FRAMES as it stood at the end of the last pass through the main loop at 61483 or the routine at 30989.

Checked by the routines at 29218, 29597 and 29952 (using the event entry at 24666), and changed by the routine at 63838. Holds the ID of Sam's current disguise.

ID	Disguise
0
1
2
3
4
5
6
7

Used by the routine at 28186.

Set by the routines at 24832, 30989 and 31126, and checked by the routine at 30972.

Set by the routine at 30458 and checked by the routine at 30675.

Checked and set by the routine at 31414. Holds the value of the two least significant bytes of the system variable FRAMES as they were when the score was last incremented.

Set by the routines at 29088 and 31289, and checked by the routine at 29361.

Used by the routine at 61823.

Data is copied here from the game status buffer template at 65504, but is never used.

Used by the routine at 26075.

Modified by the routine at 29100, and checked by the routine at 29332. Each bit set here corresponds to a disguise that is known by the police. Bit 7 (corresponding to no disguise) is always set.

Bit	Disguise
7
6
5
4
3
2
1
0

Changed by the routine at 30211, and checked by the routines at 25420, 29952 (using the event entries at 24752 and 24774) and 31713. Each bit set here corresponds to an object in Sam's possession.

Bit(s)	Object
0-5	Unused
6	Hook
7	Budgie

Changed by the routines at 30211 and 31126, and checked by the routines at 29952 (using the event entries at 24586 and 24727) and 31289. Each bit set here corresponds to a key in Sam's possession.

Bit(s)	Key
0-2	Unused
3	No. 74
4	No. 31
5	No. 27
6	No. 15
7	No. 19

Changed by the routines at 29149, 29952 (using the event entry at 24727), 31236, 31289 and 63281; checked by the routines at 29668, 31580, 31594 and 31998. The bits set here have the following meaning:

Bit(s)	Meaning if set
0	Sam is wanted by the police
1-6	Unused
7	Sam is in jail

The high score is copied here from the game status buffer template at 65504 by the routine at 63662, but never used afterwards.

Holds the current game mode (0-4). Checked by the routines at 29952 (using the event entry at 24544), 31126, 31414 and 61568, and updated by the routine at 63662.

Mode	Meaning
0	Demo mode
1	The game has just started
2	Sam has entered no. 15 with the key
3	Sam has had the phone call about the key to no. 74 and gone to the top of the apartment building
4	The mob is after Sam

Used by the routines at 26002 and 29716. A first aid kit will be displayed in the icon panel for every bit that is set.

Used by the routines at 30396, 61764, 62099 and 62120. In each flag byte here, bits 0-2 hold the door close delay timer (0 if the door is shut), and the set bit (if any) in bits 3-7 indicates the key that is required to unlock the door:

Bit	Key
3	Key to no. 74
4	Key to no. 31
5	Key to no. 27
6	Key to no. 15
7	Key to no. 19

Set by the routine at 24951, and used by the routine at 60082. Holds 107 ('k') if the Kempston joystick is being used, or 0 otherwise.

Used by the routine at 61948.

Used by the routine at 29912 to decide how to deal with Sam.

Bit	Meaning if set	Routine
0	Sam is being carried by a gangster or policeman	31476
1	Sam is immobilised (after meeting Lana)	24832
2	Unused
3	Sam is rolling or somersaulting	25805
4	Sam is on the phone	30675
5	Sam is blowing a fuse	30146
	Sam is switching a light on or off
	Sam is raising or lowering a blind
	Sam is throwing the hook
	Sam is picking up an object
6	Sam is knocking on or opening a door	62216
7	Sam is falling from the roof of a building	64403

Set by the main loop at 61483, and checked by the routine at 60641. Holds the value from the keypress offset table corresponding to the last key pressed.

Checked by many routines, and modified by the routines at 59406 and 59461.

Checked by many routines, and modified by the routines at 59516 and 59575.