CWD - Convert Word to Doubleword

        Usage:  CWD
        Modifies flags: None

        Extends sign of word in register AX throughout register DX forming
        a doubleword quantity in DX:AX.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              5     2     2     3             1


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