Routines
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B20B: Part a two-part creature again after its move
Used by the routines at WANDERER and PACER.
Undoes JOIN_HALVES: the upper half back up 12 at its own height, and the lower half back in the collision tests.
Input
IX the upper half
PART_HALVES B20B LD A,(IX+$03) up 12
B20E ADD A,$0C
B210 LD (IX+$03),A
B213 SRL (IX+$06) its own height
B217 RES 1,(IX+$27) the lower half back in collisions
B21B RET
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