Routines
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B596: Store the spark's direction and pick a frame
Used by the routines at p4_p4, m4_m4 and m4_p4.
Input
H dY
L dX
save_dX_dY B596 LD (IX+$09),L the new dX and dY
B599 LD (IX+$0A),H
B59C LD A,($5BA5) a random frame, 1 to 3
B59F AND $03
B5A1 JR NZ,set_spark_frame
B5A3 INC A
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