Update isa.org add D register
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** Registers
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** Registers
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- PC :: Program counter (32bit)
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- PC :: Program counter (32bit)
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- AC :: Accumulator (32bit)
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- A :: Accumulator (32bit)
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- X :: X register (32bit)
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- D :: Direct register (32bit)
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- Y :: Y register (32bit)
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- X :: X index register (32bit)
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- SR :: status register (32bit)
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- Y :: Y index register (32bit)
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- SR :: status register (8bit)
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- SP :: stack pointer (32bit)
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- SP :: stack pointer (32bit)
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Status register flags
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Status register flags
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