The entities, which are the robot, the shots, the enemies, the program packet and the clouds. Each is 16 bytes long. The entity is not in use if its type is zero.

Byte	What it holds
0	Sprite type. Bit 7 flips it. Bits 0 and 1 pick the frame.
1	Fraction of the horizontal position.
2	Horizontal cell.
3	Fraction of the vertical position.
4	Vertical cell.
5	Type it becomes after materialising.
6	Robot wait timer, or the robot's speed.
7	Direction in the low two bits, or a shot's range.
8	Item an enemy is carrying.
9	Time a destroyer has left.
10-13	Left unused by the handlers.
14	Program packet state: low four bits count, bit 7 destroyed.
15	Bit 0 set while the entity is visible.

Entity 0 is the robot, entities 1 to 3 are the shots, entities 4 to 9 are the enemies, entities 10 to 13 are the destroyers, entity 14 is the program packet and entities 15 to 18 are not used. The templates for the cells of the map come after them, and the last two entities are the clouds.