DQ               Define quadword                                    Directive

  [name] DQ expression [, expression ]

    Allocates a quadword (8 bytes) of storage. name is the symbol you'll
    subsequently use to refer to the data.

    expression can be

        - a ? (question mark)
        - a duplicated expression (DUP)
        - a constant expression using 64-bit arithmetic
        - a relative expression or address that requires 16 bits
          or fewer (32 bits or fewer if 80386+ selected)
        - a string of up to 8 bytes in length, using standard quoted
          string format
        - a long (64-bit) floating-point number

    Examples:   q1 DQ   2.56E-8
                q2 DQ   123456789ABCDEF0r       ; Real number (hex)