There are two types of parity bits.they are even and odd
parity.
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A parity error always causes the system to hault. On the screen,
you see the error message parity error 1 (parity error on the
motherboard) or parity error 2 (parity error on an expansion
card)
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parity error
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Parity of Authority and Responsibility?
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It can be calculated via an XOR sum of the bits, yielding 0 for even parity and 1 for odd parity