Verified
RAM parity checking is storing of a redundant parity bit showing the parity odd or even of a small amount of computer data typically one byte stored in random access memory, and the subsequent comparison of stored and the calculated parity to detect whether a data error has occurred.
The parity bit was stored originally in additional individual memory chips; along with the introduction of plug-in DIMM, SIMM, etc. modules, they became obtainable in non-parity and parity (with an extra bit per byte, storing 9 bits for every 8 bits of actual data) versions.