| P | Parity | Parity is the number of “one” bits in a binary number. Parity is either odd or even. This information is normally used in communications to verify the integrity of data sent from the sender to the receiver. |
| S | Sign Flag | A signed number is represented in its two’s complement form in the computer. The most significant bit (MSB) of a negative number in this representation is 1 and for a positive number it is zero. The sign bit of the last mathematical or logical operation’s destination is copied into the sign flag. |
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