Script data is stored in the form of encoded instructions, usually of length two bytes. If the second byte is zero then we are dealing with a script instruction. In this case, the script corresponding to the value of the first byte (an opcode) is executed via a call/jump to one of the routines at addresses stored in this table. In the event that the second byte is not zero, then the two bytes are read as a graphic layout data address, and this address is written to the graphic layout data address field of the entity whose data address is held in IX.

Some of the script routines take parameters.

Opcode	No. of parameters	Meaning
0	N/A	Unused
1	1	Load HL (script data pointer) with new address
2	0	Move entity at IX (and any carried entities) left one character
3	0	Move entity at IX (and any carried entities) right one character
4	1	If current character and target entity are in the same room then set pending sound
5	N/A	Unused
6	0	Set Berk's facing-into-screen flag, and reset his facing-left and facing-right flags
7	0	Reset Berk's facing-into-screen, facing-left and facing-right flags
8	0	Set must-process-current-script-data flag for entity at IX
9	0	Reset must-process-current-script-data flag for entity at IX
10	0	Reset entity's walking-left and walking-right flags
11	0	Set walking-left flag and reset walking-right flag
12	0	Set walking-right flag and reset walking-left flag
13	0	Set Berk's facing-left flag, and reset his facing-into-screen and facing-right flags
14	0	Set Berk's facing-right flag, and reset his facing-into-screen and facing-left flags
15	1	Jump to new address if Berk is carrying something
16	0	Have Berk hold an entity, and position it appropriately between his hands
17	0	Have Berk put down an entity in front of him, if appropriate
18	0	Have Berk put down an entity behind him, if appropriate
19	0	Move carried entity to Berk's left as he faces left
20	0	Move carried entity to Berk's right as he faces right
21	0	Move carried entity in front of Berk as he faces out of screen
22	0	Move carried entity behind Berk as he faces into screen
23	1	Start loop (1 / 3)
24	0	End loop (1 / 3)
25	1	Start loop (2 / 3)
26	0	End loop (2 / 3)
27	1	Start loop (3 / 3)
28	0	End loop (3 / 3)
29	0	Make Berk start falling, and drop his carried entity if appropriate
30	0	Check Berk's fall velocity, and react to landing
31	0	React to Berk's landing (unused)
32	0	Update Berk's position and state (flying) depending upon control input
33	0	Advance Berk's jump and select next phase if current phase complete
34	0	Move entity at IX (and any carried entities) up one character
35	0	Move entity at IX (and any carried entities) down one character
36	0	Set Boni's room (level 1) to zero
37	0	Remove flying skeleton creature from level 1, and terminate script processing
38	0	Close the Trap Door
39	0	Open the Trap Door
40	0	Move spider down one character, and if at bottom, advance it to bounce / climb up mode
41	0	Move spider up one character and, if home, reset its timer and make it wait
42	0	Decrease remaining time until spider next descends and if zero, start descent
43	0	Select next action for Drutt depending upon control input
44	0	Move entity up one character
45	0	Move entity down one character
46	0	Move Drutt, or entity he is pushing left one character and start pushed entity falling if appropriate
47	0	Move Drutt, or entity he is pushing right one character and start pushed entity falling if appropriate
48	0	Return (unused)
49	0	Return (unused)
50	0	Advance Drutt's jump and select next phase if current phase complete
51	0	Swap Drutt's current depth level if possible
52	0	Increase worm's age and decrease time until direction change, or react to Drutt's presence
53	0	Move worm left if possible, otherwise choose new direction
54	0	Move worm right if possible, otherwise choose new direction
55	0	Choose new direction and start crawling (worm)
56	0	Give Berk power corresponding to entity eaten
57	0	Cycle attributes (full-screen), clear display buffers and paint red areas outside current room
58	0	Have Berk interact appropriately with a door in front of him
59	0	Have Berk interact appropriately with a door behind him
60	0	Check position of ape-beast and turn if appropriate
61	0	Fire Bubo's projectile
62	0	Move entity at IX into room to the left, if appropriate
63	0	Have skeleton advance or retreat based upon positions of Berk and yellow skull
64	0	Set random (1 to 10) number of iterations in following loop script instruction