Contains data for 32 sprites, or actually entities, since only those entities with entries in the sprite_allocation_table are rendered as sprites. Other entities have entries in the center_enemy_map and are rendered in a bitmap at the center of the screen.

Byte offset	Purpose
$00	Sprite type, or $FF if not allocated
$01	Polar y (depth, -11 is closest, 0 is normal ship position, 116 is furthest away)
$02	Polar x (angle, 0 at bottom center, moving clockwise to 16 at the left side, 32 at the top, and 48 at the right side)
$03	Movement counter, velocity. For enemy, upper nybble from path data, lower nybble sprite position in wave
$04	Loaded pattern index within sprite type, $FF means not loaded
$05	Copy of sprite type to check for pattern reload
$06	Replacement sprite type when destroyed, or LSB of path address
$07	Flags, velocity, or MSB of path address
$08	Screen y
$09	Screen x
$0A	Pattern
$0B	Color

Sprite type	Pattern example	Description
$00		Ship body
$01		Ship exhaust
$02		Shot
$03		Double shot pickup
$04		Dots (another explosion)
$05		Destroyed enemy
$06		Number 5
$07		Number 10
$08		Number 15
$09		Number 20
$0A		Number 25
$0B		Number 30
$0C		Number 00
$0D		Explosion dot
$0E		Enemy
$0F		Enemy
$10		Enemy
$11		Enemy
$12		Enemy missile 1
$13		Enemy missile 2
$14		Meteor
$15		Laser fence end 1
$16		Laser fence end 2
$17		Laser fence center
$18		Star shaped enemy
$19		Three spheres
$1A		Enemy (chance stage) 1
$1B		Enemy (chance stage) 2
$1C		Enemy (chance stage) 3