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C493: Routine at C493
Used by the routines at A37D, B191 and C4D1.
C493 XOR A
C494 LD HL,$A01D
C497 BIT 3,(HL)
C499 JR Z,$C4AE
C49B LD A,$04
C49D BIT 7,(HL)
C49F JR NZ,$C4AE
C4A1 LD A,($A01E)
C4A4 AND $0C
C4A6 CP $0C
C4A8 LD A,$05
C4AA JR Z,$C4AE
C4AC LD A,$07
C4AE LD ($A00F),A
C4B1 RET
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