Parity - Method Data Integrity Is Maintained

DocumentID: 655252
Revision Date: 29-Feb-96 8:29:36 PM

The information in this document applies to:
WordPerfect® 5.1 for DOS

Problem

Solutions: Parity is one method that ensures data integrity is maintained. On IBM machines, each byte (eight bits) has an extra invisible bit. The eight bits are added together, and if the number is odd, the invisible bit is set to one. This creates an even number, otherwise known as even parity. If the device added the eight bits together and got an even number, set the invisible bit to one creating an odd number, this would be odd parity. For example, given the byte, 01100100, the bits added together would equal 3 (there are three ones). If this were even parity, the invisible ninth bit would be set to 1, if it were odd it would be set to 0. This principle can be extend to any number of bits.

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