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FCDB: Unused
Used by the routine at FB3E
FCDB LD A,(IX+$08)
FCDE OR A
FCDF AND $1F
FCE1 RET NZ
FCE2 LD A,(IX+$08)
FCE5 RLCA
FCE6 RLCA
FCE7 RLCA
FCE8 AND $0F
FCEA DEC A
FCEB LD B,(IX+$01)
FCEE ADD A,B
FCEF LD (IX+$0E),A
FCF2 RET
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