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70A8: Routine at 70A8
Used by the routines at 604D, 739D and 7554.
70A8 LD A,($5B06)
70AB OR A
70AC JR NZ,$70CD
70AE LD A,($5B22)
70B1 OR A
70B2 RET NZ
70B3 LD BC,$7FFE
70B6 IN A,(C)
70B8 BIT 0,A
70BA RET NZ
70BB LD A,$01
70BD LD ($5B06),A
70C0 LD HL,($5B20)
70C3 DEC H
70C4 LD ($5B07),HL
70C7 LD A,$4F
70C9 LD ($5B09),A
70CC RET
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