Checks blocks to see what to do whenever an enemy collides with a block.

X = block type*2
A0:C888: Vertical. JSR ($C88D,X)
A0:C854: Horizontal. JSR ($C859,X)

BlockType           Vert   Horz
------------------|------|------
0 = Air           | C2BC | C2BC
1 = Slope         | C319 | C2FA
2 = XRay Air      | C2BC | C2BC
3 = Treadmill     | C2BC | C2BC
4 = Shootable Air | C2BC | C2BC
5 = H-Extend      | C619 | C619
6 = Air???        | C2BC | C2BC
7 = Bombable Air  | C2BC | C2BC
8 = Solid         | C2BE | C2BE
9 = Door          | C2BE | C2BE
A = Spike         | C2C0 | C2C0
B = Crumble       | C2BE | C2BE
C = Shot          | C2BE | C2BE
D = V-Extend      | C64F | C64F
E = Grapple       | C2BE | C2BE
F = Bomb block    | C2BE | C2BE


C2BC : CLC and RTS (passable)
C2BE : SEC and RTS (solid)

C319 / C2FA : Slope stuff, I'm not disassembling that.
C619 : Adjust horizontal position according to BTS and go to the pointed-to block's code
C64F : Adjust vertical position according to BTS and go to the pointed-to block's code
C2C0 : Load ($A0C2DA,X), X = 2*(BTS & 7F). If 0000, act as solid, else make a PLM with it and act as passable.
       BTS == 0F: Break this block