Commodore Amiga Hardware Reference Manual page 216

Table 7-4: CLXCON Bits
Bit
Number
Name Function
15
ENSP7 Enable sprite 7 (OR with sprite 6)
14
ENSP5 Enable sprite 5 (OR with sprite 4)
13 ENSP3 Enable sprite 3 (OR with sprite 2)
12 ENSP1 Enable sprite 1 (OR with sprite 0)
11
ENBP6 Enable bit-plane 6 (match required for collision)
10
ENBP5 Enable bit-plane 5 (match required for collision)
9
ENBP4 Enable bit-plane 4 (match required for collision)
8 ENBP3 Enable bit-plane 3 (match required for collision)
7 ENBP2 Enable bit-plane 2 (match required for collision)
6
ENBPI Enable bit-plane 1 (match required for collision)
5
MVBP6 Match value for bit-plane 6 collision
4 MVBP5 Match value for bit-plane 5 collision
3 MVBP4 Match value for bit-plane 4 collision
2
MVBP3 Match value for bit-plane 3 collision
1
MVBP2 Match value for bit-plane 2 collision
0
MVBP1 Match value for bit-plane 1 collision
Bits 15-12 let you specify that collisions with a sprite pair are to include the odd-
numbered sprite of a pair of sprites. The even-numbered sprites always are included in
the collision detection. Bits 11-6 let you specify whether to include or exclude specific
bit-planes from the collision detection. Bits 5-0 let you specify the polarity (true-false
condition) of bits that will cause a collision. For example, you may wish to register colli-
sions only when the object collides with "something green" or "something blue." This
feature, along with the collision enable bits, allows you to specify the exact bits, and
their polarity, for the collision to be registered.
NOTES
This register is write-only. If all bit-planes are excluded (disabled), then a
bit-plane collision will always be detected.
204 System Control Hardware