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RAM parity
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<p>RAM parity checking is the storing of a <a href="/facts/Redundancy_(engineering)/odqzTmIo">redundant</a> <a href="/facts/Parity_bit/peFp3Wau">parity bit</a> representing the <a href="/facts/Parity_(mathematics)/7zq2UM4V">parity</a> (odd or even) of a small amount of computer data (typically one byte) stored in <a href="/facts/Random-access_memory/DuD4bxh6">random-access memory</a>, and the subsequent comparison of the stored and the computed parity to <a href="/facts/Error_detection/o2rH8e3n">detect whether a data error has occurred</a>. </p><p>The parity bit was originally stored in additional individual memory chips; with the introduction of plug-in <a href="/facts/DIMM/Ejh7lpxq">DIMM</a>, <a href="/facts/SIMM/hSDqXXYb">SIMM</a>, etc. modules, they became available in non-parity and parity (with an extra <a href="/facts/Bit/S972NSaD">bit</a> per <a href="/facts/Byte/BNHUp9Qq">byte</a>, storing 9 bits for every 8 bits of actual data) versions. </p>