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PC Access for Windows Reference Guide
for PC Access Version 4.30
Parity
Most telephone lines have background noise, and this can cause modems to make errors when they send or receive data. Parity is a fairly old method to detect some of these errors. (Fancier error detection and correction schemes are available today, such as MNP 5 and V.42.bis.) You can set your communications software to use None, Even, or Odd parity. When you want to dial up to a remote system, you must always select the parity value that the remote system expects.
· Tip: Almost no systems use Odd parity. Most systems that use 7 data bits use Even parity, and most systems that use 8 data bits use None.