The first and the most important of the ‘Other Registers’ in figure 1.4 that we will consider is the Accumulator. This is an 8-bit register, like all the ‘Other Registers’, and communicates with both the address bus and the data bus. The principal feature of the accumulator is that all arithmetic and most logical operations must take place using it. So, for example, if two numbers are to be added, one of them must be in the accumulator. The result of this addition will also be placed in the accumulator.
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