Parity checking
•Within a computer system, data in the form of coded characters are continuously transferred at high rates of speed between the computer, the input /output (I/O) and storage devices, and the remote workstations.
•Each device uses a built-in checking procedure to help ensure that the transmission is complete and accurate. This procedure is called parity checking.
Logically
•An ASCII character may have seven bits, but physically there are actually eight bits transmitted between hardware devices.
•The extra parity bit, which is not part of the character code, is used in the parity-checking procedure to detect whether abit has been accidentally changed, or “dropped”, during transmission. A dropped bit result in a parity error.
