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 I f   s e t ,   e m u l a t e   a n   I S A   m e m o r y   h o l e   a t   t h e   5 1 2 K B   t o   6 4 0 K B   a r e a   ( 0 x 8 0 0 0 0 - 0 x 9 F F F F ) . 