Incomputing, abase address is amemory address serving as a reference point ("base") for other addresses within adata structure.[1] Related addresses can be accessed using anaddressing scheme.
Under therelative addressing scheme, to obtain anabsolute address, the relevant base address is taken and anoffset (aka displacement) is added to it. Under this type of scheme, the base address is the lowest-numbered address within a prescribed range, to facilitate adding related positive-valued offsets.
InIBM System/360 architecture, the base address is a 24-bit value in a general register (extended in steps to 64 bits inz/Architecture), and the offset is a 12-bit value in the instruction (extended to 20 bits in z/Architecture).[2][3]
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