SAR - Shift Arithmetic Right

        Usage:  SAR     dest,count
        Modifies flags: CF OF PF SF ZF (AF undefined)

           +---------------+     +-+
        +--|7 ----------> 0|---->|C|
        |  +---------------+     +-+
        +---^

        Shifts the destination right by count bits with the current sign
        bit replicated in the leftmost bit.  The Carry Flag contains the
        last bit shifted out.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg,1             2     2     3     3             2
        mem,1           15+EA   7     7     4            2-4  (W88=23+EA)
        reg,CL           8+4n  5+n    3     3             2
        mem,CL        20+EA+4n 8+n    7     4            2-4  (W88=28+EA+4n)
        reg,immed8        -    5+n    3     2             3
        mem,immed8        -    8+n    7     4            3-5


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