Data Registers

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|    RAX                  |     EAX    | AH | AL |  -> Accumulator
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|    RBX                  |    EBX     | BH | BL |  -> Base
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|    RCX                  |    ECX     | CH | CL |  -> Counter
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|    RDX                  |    EDX     | DH | DL |  -> Data
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Reference