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On platforms with specialized registers, the A register is usually an accumulator, whose primary function is to store the results (and possibly provide a parameter of) an arithmetic function. In Intel code, for example, add ax,bx adds the contents of ax and bx together, and stores the sum in ax. RISC processors generally do not have specialized registers in this sense, and instead name most their registers generically (e.g. r0, r1, r2...). This allows any general register to perform any general function, including arithmetic. For specific chip dialects, please refer to that chipset's programming manual.

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