Constants

    Constants are numbers or strings that TASM interprets as a fixed
    value. You can use a variety of different numeric formats, including
    decimal, hexadecimal, binary, and octal.

    Numeric constants

    A numeric constant always starts with a digit (0-9). TASM determines
    the radix (number base) by first checking the last character of the
    constant. Following radixes are valid:

    Char    Radix         Example
    ─────────────────────────────
    B       binary        0001b
    O       octal         745o
    Q       octal         456q
    D       decimal       10d
    H       hexadecimal   0ffffh


    String constants

    String constants always begin with a single or double quote, and end
    with a matching single or double quote.

    Examples:  str1 db 'A message'
               str2 db "It's a message"
               str3 db 'It''s a message'