Write a subroutine to clear the flag register and accumulator
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The first MVI only clears the accumulator. The ADI adds one to it, clearing the N, Z, O, C, and P flags. The second MVI clears the accumulator again.
It is possible that I have the sense of the P flag backwards. If so, replace the first MVI with MVI A,2 and the P flag will be correct.
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