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BC21: Routine at BC21
Used by the routine at BA20.
BC21 CALL $BD51
BC24 JR NZ,$BC2F
BC26 LD A,(IX+$03)
BC29 AND $C0
BC2B CP $80
BC2D JR Z,$BC31
BC2F XOR A
BC30 RET
BC31 LD ($BA1E),IX
BC35 CALL $BCC9
BC38 JR Z,$BC43
BC3A LD A,$01
BC3C LD ($BA1D),A
BC3F SET 0,(IX+$03)
BC43 OR $01
BC45 RET
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