The entities, which are the robot, the shots, the enemies, the program packet and the clouds. Each is 10 bytes long. The entity is not in use if its type is zero.

Byte	What it holds
00	Sprite type. Bit 7 flips it. Bits 0 and 1 pick the frame.
01	Fraction of the horizontal position.
02	Horizontal cell.
03	Fraction of the vertical position.
04	Vertical cell.
05	Type it becomes after materialising.
06	Robot wait timer, or the robot's speed.
07	Direction in the low two bits, or a shot's range.
08	Item an enemy is carrying.
09	Time a destroyer has left.
0A-0D	Left unused by the handlers.
0E	Program packet state: low four bits count, bit 7 destroyed.
0F	Bit 0 set while the entity is visible.

Entity 00 is the robot, entities 01 to 03 are the shots, entities 04 to 09 are the enemies, entities 0A to 0D are the destroyers, entity 0E is the program packet and entities 0F to 12 are not used. The templates for the cells of the map come after them, and the last two entities are the clouds.