Routines
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81C4: Routine at 81C4
Used by the routine at GameLoop.
81C4 LD A,$FE
81C6 IN A,($FE)
81C8 LD B,A
81C9 LD A,$7F
81CB IN A,($FE)
81CD OR B
81CE BIT 0,A
81D0 RET NZ
81D1 JP $81C4 Jump to 81C4.
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