DT               Define ten-byte unit                               Directive

  [name] DT expression [, expression ]

    Allocates a tbyte (10 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 80-bit arithmetic
        - a relative expression or address that requires 16 bits
          or fewer (32 bits or fewer if 80386+ selected)
        - an 80-bit temporary real formatted floating-point number
        - a string of up to 10 bytes in length, using standard quoted
          string format
        - a packed decimal constant expression that has a value between 0
          and 99,999,999,999,999,999,999

    Examples:   t1 DT   1.0E30                  ; 1.0 * 10^30
                t2 DT   123456789abcdef01234r   ; Real number (hex)
                t3 DT   1234                    ; BCD format
                t4 DT   1234d                   ; Decimal

    Note: Binary Coded Decimal format is the default for the DT
          directive.
          The .MSFLOAT directive is not supported by Turbo Assembler.