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Accumulator
From SnesLab
(Redirected from accumulator)
An Accumulator is a very fast register inside a processor that acts as a mathematical scratch pad.
The 65c816's accumulator can be either 8 or 16 bits in size, as configured by the M flag. Labiak calls this 16-bit memory mode.
The high byte ("B") is still retained even when the accumulator is 8 bits wide.
The S-SMP's accumulator is always 8 bits wide.