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644D: Routine at 644D
Used by the routines at 64FA, 67AE and 6A98.
644D LD E,$00 E=00.
644F LD HL,$5E8D HL=5E8D.
6452 LD A,(HL)
6453 SUB (IX+$01)
6456 ADD A,$09
6458 BIT 3,(IX+$00)
645C JR NZ,$6462
645E CP $24
6460 JR $6464 Jump to 6464.
6462 CP $1C
6464 RET NC
6465 INC HL
6466 LD A,(HL)
6467 SRL A
6469 LD D,(IX+$02)
646C SRL D
646E SUB D
646F RET NC
6470 LD E,$01
6472 RET Return.
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