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A643: Routine at A643
A643 LD D,$30 D=30.
A645 JR $A64A Jump to A64A.
This entry point is used by the routine at A5CD.
A647 CALL $A887 Call A887.
This entry point is used by the routine at A63F.
A64A LD A,$2E A=2E.
A64C BIT 6,D Jump to A657 if bit 6 of D is set.
A64E JR NZ,$A657
A650 BIT 4,D Call A9B7 if bit 4 of D is set.
A652 CALL NZ,$A9B7
A655 BIT 4,D Call A2A2 if bit 4 of D is set.
A657 CALL NZ,$A2A2
A65A XOR A A=00.
A65B RET Return.
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