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    Memory locations can be referenced by using the binary ":" operator and
    a combination of constants, register names, and symbol names.  In the
    Intel 80x86 architecture, a memory reference requires a segment and
    offset specification.  A memory reference using the ":" operator takes
    the following form:

          
         segment:offset

    The elements segment and offset can be expressions.

    Example:

         (ES):(DI+100)
         (SS):(SP-20)