address register

The Memory Address Register or MAR is the register of a computer's control unit that contains the address of a register to fetch or store from or to the computer storage.The Memory Address Register is half of a minimal interface between a microprogram and computer storage. The other half is a memory data register.Far more exotic memory interfaces exist, but this is the least that can work.
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In computer architecture, a processor register is a small amount of storage available on the CPU whose contents can be accessed more quickly than storage available elsewhere. Most, but not all, modern computer architectures operate on the principle of moving data from main memory into registers, operating on them, then moving the result back into main memory—a so-called  load-store architecture. A common property of computer programs is locality of reference, that is the same values are often accessed repeatedly; and holding these frequently used values in registers improves program execution performance.
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address register
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