Routines
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65db: Calculate column on which to drop a new collectible item/fuel pod.
Used by the routines at 65a8 and 65f9.
Output
A Column position.
65db ld hl,$65e9 HL=item drop position table
65de ld a,($5dce) A=random number
65e1 and $0f
65e3 ld c,a BC = byte offset (0-15)
65e4 ld b,$00
65e6 add hl,bc Add offset
65e7 ld a,(hl) Set A to position
65e8 ret
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