In computer memory technology, RAS (row address strobe) is a signal sent to a dynamic random access memory (DRAM) that tells it that an associated address is a row address. A data bit in DRAM is stored in a cell located by the intersection of a column address and a row address. A column address strobe (CAS) signal is used to validate the column address.
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RAS is also an abbreviation for "reliability, availability, and serviceability" and for registration, admission, and status.