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In addition to referring to memory locations by symbolic name or line
number, you can also refer to them using a combination of constants,
register names, and symbol names.  In the Intel 80x86 architecture, a memory
reference requires a segment and offset specification.  When symbol names
are used, these are implicit.  The general form of a memory reference is:

      
     [segment:]offset

When an offset is specified alone, the default segment value is taken from
the CS, DS or SS register depending on the circumstances.