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BD51: Routine at BD51
Used by the routines at BA20 and BC21.
BD51 LD IX,$9965
This entry point is used by the routine at BD4B.
BD55 LD A,(IX+$00)
BD58 CP $FF
BD5A JR Z,$BD66
BD5C CALL $BD69
BD5F JR Z,$BD68
BD61 CALL $BE5A
BD64 JR $BD55
BD66 OR $01
BD68 RET
BD69 LD A,($BA1A)
BD6C CP (IX+$01)
BD6F RET NZ
BD70 LD A,($BA19)
BD73 CP (IX+$00)
BD76 RET NZ
BD77 LD A,($BA1B)
BD7A CP (IX+$02)
BD7D RET
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