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FCB4: Unused
Used by the routine at FB3E
FCB4 LD A,(IX+$09)
FCB7 BIT 4,A
FCB9 RET Z
FCBA AND $0F
FCBC CP $0F
FCBE RET NZ
FCBF LD A,(IX+$09)
FCC2 AND $F0
FCC4 SRL A
FCC6 SRL A
FCC8 SRL A
FCCA SRL A
FCCC DEC A
FCCD SRL A
FCCF SUB $04
FCD1 NEG
FCD3 LD B,(IX+$02)
FCD6 ADD A,B
FCD7 LD (IX+$0F),A
FCDA RET
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