Odd parity = (make sum of the bits odd Even parity = (make sum of the bits even) Mark parity = (parity bit is always 1, select "1's" on some terminals) Space parity = (parity bit is always 0; "0's" on some terminals, "0" on 262x, "None" on 264x) None/8 = 8 bits used for data, no parity computed