Initialised by the routine at 8912, and used by the routines at 90C0 and 91BE. There are eight buffers here, each one eight bytes long, used to hold the state of the entities (rope, arrows and guardians) in the current room.

For a horizontal guardian, the eight bytes are used as follows:

Byte	Contents
0	Bit 7: direction (0=left, 1=right)
	Bits 5-6: animation frame index
	Bits 3-4: unused
	Bits 0-2: entity type (001)
1	Bits 5-7: animation frame index mask
	Bit 4: unused
	Bit 3: BRIGHT value
	Bits 0-2: INK colour
2	Bits 5-7: base sprite index
	Bits 0-4: x-coordinate
3	Pixel y-coordinate x2 (index into the table at 8200)
4	Unused
5	Page containing the sprite graphic data (see AB00)
6	Minimum x-coordinate
7	Maximum x-coordinate

For a vertical guardian, the eight bytes are used as follows:

Byte	Contents
0	Bits 5-7: animation frame index
	Bits 3-4: animation frame update flags (see 917F)
	Bits 0-2: entity type (010)
1	Bits 5-7: animation frame index mask
	Bit 4: unused
	Bit 3: BRIGHT value
	Bits 0-2: INK colour
2	Bits 5-7: base sprite index
	Bits 0-4: x-coordinate
3	Pixel y-coordinate x2 (index into the table at 8200)
4	Pixel y-coordinate increment
5	Page containing the sprite graphic data (see AB00)
6	Minimum y-coordinate
7	Maximum y-coordinate

For an arrow, the eight bytes are used as follows:

Byte	Contents
0	Bit 7: direction (0=left, 1=right)
	Bits 3-6: unused
	Bits 0-2: entity type (100)
1	Unused
2	Pixel y-coordinate x2 (index into the table at 8200)
3	Unused
4	x-coordinate
5	Collision detection byte (0x00=off, 0xFF=on)
6	Top/bottom pixel row (drawn either side of the shaft)
7	Unused

The rope uses the second and fourth bytes of the following buffer in addition to its own; these ten bytes are used as follows:

Byte	Contents
0	Bit 7: direction (0=left, 1=right)
	Bits 3-6: unused
	Bits 0-2: entity type (011)
1	Animation frame index
2	x-coordinate of the top of the rope
3	x-coordinate of the segment of rope being drawn
4	Length (0x20)
5	Segment drawing byte
6	Unused
7	Animation frame at which the rope changes direction (0x36)
9	Index of the segment of rope being drawn (0x00-0x20)
11	Bits 1-7: unused
	Bit 0: Willy is on the rope (set), or not (reset)

Note that if a rope were the eighth entity specified in a room, its buffer would use the first and third bytes in the otherwise unused area at 8141.