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FDB9: Unused
Used by the routine at FB3E.
FDB9 LD A,(IX+$08)
FDBC CPL
FDBD AND (IX+$09)
FDC0 BIT 4,A
FDC2 RET Z
FDC3 LD A,(IX+$09)
FDC6 AND $1F
FDC8 CP $1F
FDCA RET NZ
FDCB LD A,(IX+$08)
FDCE AND $0F
FDD0 RET NZ
FDD1 CALL $FB9E
FDD4 RET
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